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2897 Commits

Author SHA1 Message Date
Chris Lattner
29cd5ba621 factor a whole bunch of code out into a helper function. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@59398 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-11-16 05:06:21 +00:00
Chris Lattner
b9553d693b simplify the conditions on two gigantic if's, decreasing indentation 
a bit.  Next step is to factor out into their own helper functions.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@59397 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-11-16 04:55:20 +00:00
Chris Lattner
6046fb7bef simplify some instcombine matches by using m_Specific 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@59395 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-11-16 04:46:19 +00:00
Chris Lattner
321e6a6e82 Use new m_SelectCst template to eliminate macros. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@59392 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-11-16 04:33:38 +00:00
Chris Lattner
a6a474dca9 simplify code. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@59390 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-11-16 04:26:55 +00:00
Chris Lattner
a74cefa6d3 Handle the case where there is no "not". It is possible it got 
folded into the select.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@59389 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-11-16 04:25:26 +00:00
Chris Lattner
faaf951fab factor a bunch of copy/paste code out into a helper function. 
Eliminate the cases checking for cond?0:-1, since that is already
handled by commutative checking.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@59388 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-11-16 04:24:12 +00:00
Chris Lattner
1ca0c9922b rearrange some code, no functionality change. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@59381 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-11-16 03:56:24 +00:00
Chris Lattner
7d3b4e92ab if we're going to use a macro, use it maximally. no functionality change. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@59380 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-11-16 03:54:57 +00:00
Devang Patel
35275f499a Cleanup debug info. assocated with deleted instructions. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@59012 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-11-11 00:54:10 +00:00
Devang Patel
d4e7f44319 If the sign of exit condition and split condition does not match 
then do not split loop index.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@58995 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-11-10 19:48:34 +00:00
Bill Wendling
11bb6c6d2c Third time's a charm. 
The previous patches didn't match correctly. Also, we need to make sure that
the conditional is the same before doing the transformation.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@58978 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-11-10 06:59:06 +00:00
Mon P Wang
aeb06d2462 Added support for the following definition of shufflevector 
<result> = shufflevector <n x <ty>> <v1>, <n x <ty>> <v2>, <m x i32> <mask> 



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@58964 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-11-10 04:46:22 +00:00
Bill Wendling
8f24cc237f Correction for the last patch. Should match the conditional in the first part 
of the select match, not the select instruction itself.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@58947 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-11-09 23:37:53 +00:00
Bill Wendling
1fb43c32ed The method of doing the matching with a 'select' instruction was wrong. The 
original code was matching like this:

	if (match(A, m_Not(m_Value(B))))

B was already matched as a 'select' instruction. However, this isn't matching
what we think it's matching. It would match B as a 'Value', so basically
anything would match to it. In this case, a Constant matched. B was replaced
with a constant representation. And then the wrong value would be used in the
SelectInst::Create statement, causing a crash.

After thinking on this for a moment, and after Nick L. told me how the pattern
matching stuff was supposed to work, the solution was to match NOT an m_Value,
but an m_Select.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@58946 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-11-09 23:17:42 +00:00
Nuno Lopes
ea736cee2b fix leakage of ValueNumbering 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@58933 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-11-09 12:45:23 +00:00
Bill Wendling
c143bcf9ac If the LHS of the FCMP is coming from a UIToFP instruction, then we don't want 
to generate signed ICMP instructions to replace the FCMP. This would violate
the following:

define i1 @test1(i32 %val) {
  %1 = uitofp i32 %val to double
  %2 = fcmp ole double %1, 0.000000e+00
  ret i1 %2
}

would be transformed into:

define i1 @test1(i32 %val) {
  %1 = icmp slt i33 %val, 1
  ret i1 %1
}

which is obviously wrong. This patch modifes InstCombiner::FoldFCmp_IntToFP_Cst
to handle when the LHS comes from UIToFP.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@58929 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-11-09 04:26:50 +00:00
Mon P Wang
e0b436ac41 Fixed scalarizing an extract subvector and prevent an infinite loop 
when simplify a vector. 


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@58820 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-11-06 22:52:21 +00:00
Oscar Fuentes
436893d924 CMake: updated list of source files. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@58736 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-11-05 00:11:22 +00:00
Dan Gohman
8f027c7fea Add a new pass to simplify specific half_powr function calls. This is 
a specialized pass that it not likely to be generally useful.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@58732 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-11-04 23:41:45 +00:00
Dale Johannesen
c0bc547c99 Allow SROA of vectors. Removing this caused a 
huge performance regression in something we care
about.  This may not be final fix.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@58718 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-11-04 20:54:03 +00:00
Devang Patel
265ca5dff5 Ignore conditions that are outside the loop. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@58631 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-11-03 19:38:07 +00:00
Devang Patel
58d43d4a41 Turn floating point IVs into integer IVs where possible. 
This allows SCEV users to effectively calculate trip count.
LSR later on transforms back integer IVs to floating point IVs
later on to avoid int-to-float casts inside the loop.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@58625 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-11-03 18:32:19 +00:00
Nick Lewycky
af38613e31 Replace explicit loop with utility function. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@58593 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-11-03 03:49:14 +00:00
Nick Lewycky
8e39432ea9 Fix demanded bits analysis with srem by negative number. Based on a patch 
by Richard Osborne.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@58555 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-11-02 02:41:50 +00:00
Dan Gohman
21440acc06 Fix this recently moved code to use the correct type. CI is now a 
ConstantInt, and SI is the original cast instruction. This fixes
PR2996.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@58549 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-11-02 00:17:33 +00:00
Dan Gohman
1975d03183 Canonicalize sext(i1) to i1?-1:0, and update various instcombine 
optimizations accordingly.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@58457 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-10-30 20:40:10 +00:00
Dan Gohman
b493b2774c (A & sext(C)) | (B & ~sext(C) -> C ? A : B 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@58351 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-10-28 22:38:57 +00:00
Nick Lewycky
79cce5c51b Add value range analyzing of Add and Sub. 
Understand that mul %x, 1 = %x.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@58069 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-10-24 04:00:26 +00:00
Daniel Dunbar
394f0441e0 Change create*Pass factory functions to return Pass* instead of 
LoopPass*.
 - Although less precise, this means they can be used in clients
   without RTTI (who would otherwise need to include LoopPass.h, which
   eventually includes things using dynamic_cast). This was the
   simplest solution that presented itself, but I am happy to use a
   better one if available.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@58010 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-10-22 23:32:42 +00:00
Dan Gohman
a1fcd77ccf Use 0 instead of false to return a null pointer. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@57660 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-10-17 00:56:52 +00:00
Dan Gohman
2276a7bc8e Teach instcombine's visitLoad to scan back several instructions 
to find opportunities for store-to-load forwarding or load CSE,
in the same way that visitStore scans back to do DSE. Also, define
a new helper function for testing whether the addresses of two
memory accesses are known to have the same value, and use it in
both visitStore and visitLoad.

These two changes allow instcombine to eliminate loads in code
produced by front-ends that frequently emit obviously redundant
addressing for memory references.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@57608 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-10-15 23:19:35 +00:00
Evan Cheng
403006205f Combine (fcmp cc0 x, y) | (fcmp cc1 x, y) into a single fcmp when possible. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@57515 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-10-14 18:44:08 +00:00
Evan Cheng
4990b257dd - Somehow I forgot about one / une. 
- Renumber fcmp predicates to match their icmp counterparts.
- Try swapping operands to expose more optimization opportunities.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@57513 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-10-14 18:13:38 +00:00
Evan Cheng
8db90725cb Optimize anding of two fcmp into a single fcmp if the operands are the same. e.g. uno && ueq -> ueq 
ord && olt -> olt
     ord && ueq -> oeq


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@57507 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-10-14 17:15:11 +00:00
Matthijs Kooijman
7e6d9b96ad Make InstructionCombining::getBitCastOperand() recognize GEP instructions and 
constant expression with all zero indices as being the same as a bitcast.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@57442 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-10-13 15:17:01 +00:00
Chris Lattner
a6321b40c2 Fix PR2697 by rewriting the '(X / pos) op neg' logic. This also changes 
a couple other cases for clarity, but shouldn't affect correctness.

Patch by Eli Friedman!



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@57387 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-10-11 22:55:00 +00:00
Devang Patel
fc19fbd2ca Check loop exit predicate properly while eliminating one iteration loop. 
This patch fixes PR 2869


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@57369 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-10-10 22:02:57 +00:00
Nuno Lopes
7cdd9ee088 fix memleak by cleaning the global sets on pass exit 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@57353 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-10-10 16:25:50 +00:00
Dale Johannesen
23a98551ab Add a "loses information" return value to APFloat::convert 
and APFloat::convertToInteger.  Restore return value to
IEEE754.  Adjust all users accordingly.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@57329 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-10-09 23:00:39 +00:00
Duncan Sands
4520dd2b7b Add <cstdio> include where needed by gcc-4.4. 
Patch by Samuel Tardieu.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@57291 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-10-08 07:23:46 +00:00
Chris Lattner
de17ddc65f Add parentheses to avoid warnings in GCC 4.4.0, 
patch by Samuel Tardieu!



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@57288 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-10-08 06:42:28 +00:00
Devang Patel
d44b7c1b07 Fix typo, fix PR 2865. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@57221 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-10-06 23:22:54 +00:00
Matthijs Kooijman
5fac55fafb Allow scalarrepl to treat an all-zero GEP just as bitcast. 
This includes not marking a GEP involving a vector as unsafe, but only when it
has all zero indices. This allows scalarrepl to work in a few more cases.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@57177 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-10-06 16:23:31 +00:00
Chris Lattner
8c34cd287a rewrite bswap matching to be more general, allowing arbitrary 
shifting and masking inside a bswap expr.  This allows it to handle
the cases from PR2842, which involve the intermediate 'or' 
expressions being shifted, not just the input value.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@57095 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-10-05 02:13:19 +00:00
Chris Lattner
2f63ca3fa8 fix a bug where the bswap matcher could match a case involving 
ashr.  It should only apply to lshr.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@57089 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-10-05 00:50:57 +00:00
Duncan Sands
5d0392c6b3 Factorize code: remove variants of "strip off 
pointer bitcasts and GEP's", and centralize the
logic in Value::getUnderlyingObject.  The
difference with stripPointerCasts is that
stripPointerCasts only strips GEPs if all
indices are zero, while getUnderlyingObject
strips GEPs no matter what the indices are.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@56922 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-10-01 15:25:41 +00:00
Dan Gohman
586b7b7547 Call ScalarEvolution's deleteValueFromRecords before deleting an 
instruction, not after. This fixes some uses of free'd memory.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@56908 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-10-01 02:02:03 +00:00
Nick Lewycky
a06cf82a7b Fix misoptimization of: xor i1 (icmp eq (X, C1), icmp s[lg]t (X, C2)) 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@56834 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-09-30 06:08:34 +00:00
Devang Patel
2c9c3e7368 Implement function notes as function attributes. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@56716 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-09-26 23:51:19 +00:00
Devang Patel
19c874638d Now Attributes are divided in three groups 
- return attributes - inreg, zext and sext
- parameter attributes
- function attributes - nounwind, readonly, readnone, noreturn

Return attributes use 0 as the index.
Function attributes use ~0U as the index.

This patch requires corresponding changes in llvm-gcc and clang.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@56704 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-09-26 22:53:05 +00:00
Devang Patel
0598866c05 Large mechanical patch. 
s/ParamAttr/Attribute/g
s/PAList/AttrList/g
s/FnAttributeWithIndex/AttributeWithIndex/g
s/FnAttr/Attribute/g

This sets the stage 
- to implement function notes as function attributes and 
- to distinguish between function attributes and return value attributes.

This requires corresponding changes in llvm-gcc and clang.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@56622 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-09-25 21:00:45 +00:00
Evan Cheng
a7e6146688 Commit CodeGenPrepare.cpp changes which was accidentially left out of 56526. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@56549 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-09-24 06:48:55 +00:00
Eric Christopher
692bf6b85e Fix fallout in CodeGenPrepare from 56526. Will likely need more work. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@56546 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-09-24 05:32:41 +00:00
Devang Patel
e3d76d37e9 s/ParamAttrsWithIndex/FnAttributeWithIndex/g 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@56535 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-09-24 00:55:02 +00:00
Devang Patel
20bcaff6a7 Put FN_NOTE_AlwaysInline and others in FnAttr namespace. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@56527 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-09-24 00:06:15 +00:00
Devang Patel
dd4924c564 Move FN_NOTE_AlwaysInline and other out of ParamAttrs namespace. 
Do not check isDeclaration() in hasNote(). It is clients' responsibility.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@56524 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-09-23 23:52:03 +00:00
Devang Patel
eaf42abab6 s/ParameterAttributes/Attributes/g 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@56513 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-09-23 23:03:40 +00:00
Devang Patel
d9b4a5f859 Use parameter attribute store (soon to be renamed) for 
Function Notes also. Function notes are stored at index ~0.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@56511 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-09-23 22:35:17 +00:00
Devang Patel
f3ba70861c Add hasNote() to check note associated with a function. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@56477 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-09-22 22:32:29 +00:00
Oscar Fuentes
3d01fc7de8 Initial support for the CMake build system. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@56419 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-09-22 01:08:49 +00:00
Duncan Sands
acdb2eeb45 Remove the MarkModRef pass (use AddReadAttrs instead). 
Unfortunately this means removing one regression test
of GlobalsModRef because I couldn't work out how to
perform it without MarkModRef.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@56342 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-09-19 08:23:44 +00:00
Devang Patel
4fe0fe8b49 splitLoop does not handle split condition EQ. 
Fixes PR 2805


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@56321 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-09-18 23:45:14 +00:00
Bill Wendling
670ed09238 Decrementing the iterator here could be wrong if the worklist is empty after the "erase". 
Thanks to Ji Young Park for the patch!


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@56316 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-09-18 23:04:18 +00:00
Devang Patel
00622952ce Do not ignore iv uses outside the loop. 
This one slipped through cracks very well.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@56284 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-09-17 17:53:47 +00:00
Dan Gohman
81b28ceab6 Improve instcombine's handling of integer min and max in two ways: 
- Recognize expressions like "x > -1 ? x : 0" as min/max and turn them
   into expressions like "x < 0 ? 0 : x", which is easily recognizable
   as a min/max operation.
 - Refrain from folding expression like "y/2 < 1" to "y < 2" when the
   comparison is being used as part of a min or max idiom, like
   "y/2 < 1 ? 1 : y/2". In that case, the division has another use, so
   folding doesn't eliminate it, and obfuscates the min/max, making it
   harder to recognize as a min/max operation.

These benefit ScalarEvolution, CodeGen, and anything else that wants to
recognize integer min and max.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@56246 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-09-16 18:46:06 +00:00
Dan Gohman
ad7321f58a Teach LSR to optimize away SMAX operations for tripcounts in common 
cases.  See the comment above OptimizeSMax for the full story, and
the testcase for an example. This cancels out a pessimization
commonly attributed to indvars, and will allow us to lift some of
the artificial throttles in indvars, rather than add new ones.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@56230 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-09-15 21:22:06 +00:00
Dan Gohman
4f833d4351 On 64-bit targets, change 32-bit getelementptr indices to be 64-bit 
getelementptr indices, inserting an explicit cast if necessary.
This helps expose the sign-extension operation to other optimizations.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@56133 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-09-11 23:06:38 +00:00
Dan Gohman
3139ff8f7b Fix a vectorshuffle instcombine bug introduced by r55995. 
Patch by Nicolas Capens!


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@56129 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-09-11 22:47:57 +00:00
Dan Gohman
bcb37fd22f Fix a copy+paste bug that Duncan spotted. For several 
cases it was still getting lucky and detecting overflow
but it was clearly incorrect.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@56113 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-09-11 18:53:02 +00:00
Dan Gohman
7f85fbd9de In my analysis for r56076 I missed the case where the original 
multiplication overflows.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@56082 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-09-11 00:25:00 +00:00
Dan Gohman
1df3fd6683 Fix an icmp+sdiv optimization to check for and handle an overflow 
condition. This fixes PR2740.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@56076 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-09-10 23:30:57 +00:00
Devang Patel
36a5bf8fd8 fix white spaces. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@56056 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-09-10 14:49:55 +00:00
Dan Gohman
cb89309399 Fix a warning about comparing signed and unsigned values. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@56040 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-09-10 01:09:32 +00:00
Devang Patel
d22a849282 if loop induction variable is always sign or zero extended then 
extend the type of induction variable.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@56017 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-09-09 21:41:07 +00:00
Devang Patel
4b3f08bac7 fix overflow check. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@56011 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-09-09 20:54:34 +00:00
Dan Gohman
488fbfc69e Make SimplifyDemandedVectorElts simplify vectors with multiple 
users, and teach it about shufflevector instructions.

Also, fix a subtle bug in SimplifyDemandedVectorElts'
insertelement code.

This is a patch that was originally written by Eli Friedman,
with some fixes and cleanup by me.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@55995 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-09-09 18:11:14 +00:00
Devang Patel
2379089a6e s/RemoveUnreachableBlocks/RemoveUnreachableBlocksFromFn/g 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@55965 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-09-08 22:14:17 +00:00
Devang Patel
245d0ab166 Remove unused counter. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@55924 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-09-08 17:14:54 +00:00
Devang Patel
175f9d94db Remove OptimizeIVType() 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@55913 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-09-08 16:13:27 +00:00
Devang Patel
bcc11d2a71 Remove unused map. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@55861 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-09-05 21:55:33 +00:00
Devang Patel
deafefabae A loop may be unswitched multiple times. Reconstruct dom info. at the end. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@55806 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-09-04 22:43:59 +00:00
Devang Patel
027bb92541 Initialize loop data first. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@55792 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-09-04 20:36:36 +00:00
Devang Patel
10b359ccb6 Do not unswitch if the function notes say we're optimizing this function for size. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@55786 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-09-04 18:55:13 +00:00
Dale Johannesen
53bfbbccbf Add intrinsic forms of pow and exp2. The non-intrinsic 
forms remain to handle older IR files, but will go away soon.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@55781 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-09-04 18:30:46 +00:00
Dan Gohman
ae73dc1448 Tidy up several unbeseeming casts from pointer to intptr_t. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@55779 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-09-04 17:05:41 +00:00
Owen Anderson
0c7f91cf84 Fix a bug that prevented PRE from applying in some cases. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@55744 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-09-03 23:06:07 +00:00
Nick Lewycky
23c04309fb Don't apply this transform to vectors. Fixes PR2756. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@55690 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-09-03 06:24:21 +00:00
Devang Patel
e925ccc553 Add additional check to ensure that iv is canonicalized. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@55682 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-09-03 00:29:13 +00:00
Devang Patel
a9348dc7ac Check iteration count. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@55680 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-09-03 00:10:56 +00:00
Devang Patel
c72139134c While removing PHI, use basicblock to identify incoming value. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@55678 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-09-03 00:02:42 +00:00
Devang Patel
108f92e376 If all IV uses are extending integer IV then change the type of IV itself, if possible. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@55674 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-09-02 22:18:08 +00:00
Duncan Sands
3cd652d530 Add a small pass that sets the readnone/readonly 
attributes on functions, based on the result of
alias analysis.  It's not hardwired to use
GlobalsModRef even though this is the only (AFAIK)
alias analysis that results in this pass actually
doing something.  Enable as follows:
  opt ... -globalsmodref-aa -markmodref ...
Advantages of this pass: (1) records the result
of globalsmodref in the bitcode, meaning it is
available for use by later passes (currently
the pass manager isn't smart enough to magically
make an advanced alias analysis available to all
later passes), which may expose more optimization
opportunities; (2) hopefully speeds up compilation
when code is optimized twice, for example when a
file is compiled to bitcode, then later LTO is done
on it: marking functions readonly/readnone when
producing the initial bitcode should speed up alias
analysis during LTO; (3) good for discovering that
globalsmodref doesn't work very well :)
Not currently turned on by default.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@55604 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-09-01 11:40:11 +00:00
Devang Patel
18bb2788a0 Do not apply the transformation if the target does not support DestTy natively. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@55433 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-08-27 20:55:23 +00:00
Devang Patel
541532724e Fix typos and whitespaces. Other cosmetic changes based on feedback. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@55424 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-08-27 17:50:18 +00:00
Owen Anderson
516eb1c139 Put a heuristic in place to prevent GVN from falling into bad cases with massively complicated CFGs. 
This speeds up a particular testcase from 12+ hours to 5 seconds with little perceptible loss of quality.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@55391 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-08-26 22:07:42 +00:00
Devang Patel
a0b3909d43 If IV is used in a int-to-float cast inside the loop then try to eliminate the cast operation. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@55374 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-08-26 17:57:54 +00:00
Chris Lattner
7eb01bfc16 improve encapsulation of the BBExecutable set. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@55271 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-08-23 23:39:31 +00:00
Chris Lattner
cf712dee93 Switch an assortment of maps, sets and vectors to more efficient versions, 
patch contributed by m-s!


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@55270 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-08-23 23:36:38 +00:00
Chris Lattner
944fac71e0 Switch the asmprinter (.ll) and all the stuff it requires over to 
use raw_ostream instead of std::ostream.  Among other goodness,
this speeds up llvm-dis of kc++ with a release build from 0.85s
to 0.49s (88% faster).

Other interesting changes:
 1) This makes Value::print be non-virtual.
 2) AP[S]Int and ConstantRange can no longer print to ostream directly, 
    use raw_ostream instead.
 3) This fixes a bug in raw_os_ostream where it didn't flush itself 
    when destroyed.
 4) This adds a new SDNode::print method, instead of only allowing "dump".


A lot of APIs have both std::ostream and raw_ostream versions, it would
be useful to go through and systematically anihilate the std::ostream 
versions.

This passes dejagnu, but there may be minor fallout, plz let me know if
so and I'll fix it.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@55263 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-08-23 22:23:09 +00:00
Chris Lattner
88e6dc8bf1 Fix PR2423 by checking all indices for out of range access, not only 
indices that start with an array subscript.  x->field[10000] is just 
as bad as (*X)[14][10000].


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@55226 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-08-23 05:21:06 +00:00
Chris Lattner
2dba6a1bdb consolidate DenseMapInfo implementations, and add one for std::pair. 
Patch contributed by m-s.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@55167 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-08-22 05:08:25 +00:00
Nick Lewycky
5d52c4501a Revert r54876 r54877 r54906 and r54907. Evan found that these caused a 20% 
slowdown in bzip2.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@55113 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-08-21 05:56:10 +00:00
Evan Cheng
ab5d5e360e Silence a compiler warning. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@55087 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-08-20 23:36:48 +00:00
Mon P Wang
4f5ca2cf80 Fixed shuffle optimizations to handle non power of 2 vectors 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@55035 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-08-20 02:23:25 +00:00
Chris Lattner
7de3b5db26 don't use the result of WriteAsOperand 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@54979 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-08-19 04:45:19 +00:00
Nick Lewycky
e86389dd2a Make this comment clearer. Instead of using an ambiguous ~ (not) on an icmp 
predicate, swap the order of the operands.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@54907 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-08-17 20:02:02 +00:00
Nick Lewycky
91a0f78265 Consider the case where xor by -1 and xor by 128 have been combined already to 
produce an xor by 127.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@54906 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-08-17 19:58:24 +00:00
Evan Cheng
ee2aa85f44 Revert 54821. It's miscompiling 252.eon and 447.dealII 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@54878 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-08-17 08:07:31 +00:00
Nick Lewycky
cbe23e33ba I found a better place for this optz'n. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@54877 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-08-17 07:54:14 +00:00
Nick Lewycky
1b344bc986 Xor'ing both sides of icmp by sign-bit is equivalent to swapping signedness of 
the predicate.

Also, make this optz'n apply in more cases where it's safe to do so.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@54876 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-08-17 07:34:14 +00:00
Owen Anderson
3688f268cb Remove GCSE, ValueNumbering, and LoadValueNumbering. These have been deprecated for almost a year; it's finally time for them to go away. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@54822 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-08-15 21:31:02 +00:00
Devang Patel
35115f92e4 Reapply 54786. Add overflow and number of mantissa bits checks. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@54821 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-08-15 21:21:34 +00:00
Evan Cheng
21066541ae Revert 54786. It's not checking for overflows, etc. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@54813 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-08-15 08:12:11 +00:00
Chris Lattner
2806dffc73 use smallvector instead of vector for a couple worklists. This speeds up instcombine 
by ~10% on some testcases.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@54811 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-08-15 04:03:01 +00:00
Bill Wendling
7a7cf6b984 Temporarily revert r54792. It's causing an ICE during bootstrapping. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@54804 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-08-14 23:05:24 +00:00
Devang Patel
1df183f554 Use DenseMap. Patch by Pratik Solanki. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@54792 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-08-14 21:31:10 +00:00
Devang Patel
79ceb4463e If IV is used in a int-to-float cast inside the loop then try to eliminate the cast opeation. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@54786 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-08-14 20:58:31 +00:00
Dan Gohman
a8c763b307 Use empty() instead of begin() == end(). 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@54780 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-08-14 18:13:49 +00:00
Dan Gohman
a60832b018 Fix a bogus srem rule - a negative value srem'd by a power-of-2 
can have a non-negative result; for example, -16%16 is 0. Also,
clarify the related comments. This fixes PR2670.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@54767 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-08-13 23:12:35 +00:00
Dan Gohman
2edeb63ece Fix SCCP's handling of struct value loads and stores. SCCP doesn't 
track individual leaf values in such cases, so it needs to treat
struct values as normal values in this case.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@54760 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-08-13 21:22:48 +00:00
Devang Patel
c677de2713 Rename. s/FindIVForUser/FindIVUserForCond/g 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@54754 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-08-13 20:31:11 +00:00
Devang Patel
d16aba22c9 Check sign to detect overflow before changing compare stride. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@54710 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-08-13 02:05:14 +00:00
Chris Lattner
b8cd4d3d49 Implement support for simplifying vector comparisons by 0.0 and 1.0 like we 
do for scalars.  Patch contributed by Nicolas Capens

This also generalizes the previous xforms to work on long double, now that 
isExactlyValue works for long double.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@54653 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-08-11 22:06:05 +00:00
Eric Christopher
7a61d701c0 Have IRBuilder take a template argument on whether or not to preserve 
names. This can save a lot of allocations if you aren't going to be
looking at the output.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@54546 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-08-08 19:39:37 +00:00
Dan Gohman
4ce9627e97 Fix a shufflevector instcombine that was emitting invalid masks indices 
when it meant to be emitting undef indices.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@54417 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-08-06 18:17:32 +00:00
Evan Cheng
f5e25f32c7 Fix PR2355: bug in ChangeCompareStride. When the loop termination compare is the only use of its iv stride, the stride can be eliminated by moving it to another stride. If the scale is negative, swap the predicate instead of using a inverse predicate. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@54415 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-08-06 18:04:43 +00:00
Chris Lattner
46bbad217b optimize a common idiom generated by clang for bitfield access, PR2638. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@54408 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-08-06 07:35:52 +00:00
Chris Lattner
5af5f463e1 Zap sitofp/fptoui pairs. In all cases when the sign difference 
matters, the result is undefined anyway.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@54396 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-08-06 05:13:06 +00:00
Nick Lewycky
b30591ec64 Reinstate this optimization, but without the miscompile. Thanks to Bill for 
tracking down that this was breaking llvm-gcc bootstrap on Linux.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@54394 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-08-06 04:54:03 +00:00
Dan Gohman
5a6c448a7e Pass the computed iteration count value to RewriteLoopExitValues 
instead of having it call getIterationCount again.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@54380 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-08-05 22:34:21 +00:00
Bill Wendling
021507be82 Revert r53282. This was causing a miscompile on Linux. Also, the transformation 
looks bogus. Please see PR2629 for details on why this is breaking things.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@54372 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-08-05 21:23:45 +00:00
Duncan Sands
58921feaa9 Fix comment typos. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@54266 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-08-01 12:23:49 +00:00
Nate Begeman
5bc1ea0736 Add vector shifts to the IR, patch by Eli Friedman. 
CodeGen & Clang work coming next.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@54161 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-07-29 15:49:41 +00:00
Matthijs Kooijman
75cf9cc527 Add -unroll-allow-partial command line option that enabled the loop unroller to 
partially unroll a loop when fully unrolling would not fit under the threshold.

Patch by Mikael Lepistö.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@54160 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-07-29 13:21:23 +00:00
Owen Anderson
80e051dfde Don't remove volatile loads. Thanks to Duncan for noticing this one. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@54144 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-07-28 20:52:42 +00:00
Owen Anderson
8aa895b19a Add support for eliminating stores that store the same value that was just loaded. 
This fixes PR2599.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@54133 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-07-28 16:14:26 +00:00
Dan Gohman
475871a144 Rename SDOperand to SDValue. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@54128 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-07-27 21:46:04 +00:00
Dan Gohman
3eee6542f5 Put the LICM of constant GlobalVariables, introduced in r53945, under a 
command-line option, and disable it by default. It introduced performance
regressions because CodeGen is currently not able to remat such loads.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@53997 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-07-24 23:57:25 +00:00
Chris Lattner
967948b4e2 "Allow LICM to sink or lift loads from constant memory. Also add a test 
case for this.

This allows instructions like loads from global variables declared to
be constant to be moved out of loops."

Patch by Stefanus Du Toit!



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@53945 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-07-23 05:06:28 +00:00
Dan Gohman
fc74abfba5 Enable first-class aggregates support. 
Remove the GetResultInst instruction. It is still accepted in LLVM assembly
and bitcode, where it is now auto-upgraded to ExtractValueInst. Also, remove
support for return instructions with multiple values. These are auto-upgraded
to use InsertValueInst instructions.

The IRBuilder still accepts multiple-value returns, and auto-upgrades them
to InsertValueInst instructions.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@53941 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-07-23 00:34:11 +00:00
Dan Gohman
7375fbcbf2 Fix a bug in LSR's dead-PHI cleanup. If a PHI has a def-use chain that 
leads into a cycle involving a different PHI, LSR got stuck running
around that cycle looking for the original PHI. To avoid this, keep
track of visited PHIs and stop searching if we see one more than once.
This fixes PR2570.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@53879 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-07-21 21:45:02 +00:00
Duncan Sands
6c4d8e3ee4 Supress a gcc-4.3 warning. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@53771 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-07-18 21:06:02 +00:00
Owen Anderson
e98c54c47c Make PRE actually handle critical edges (by splitting them). Confirmed that bootstrap passes with this change. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@53762 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-07-18 18:03:38 +00:00
Owen Anderson
c2b856e5b4 Enable PRE. My last batch of changes fixed the miscompile. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@53730 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-07-17 19:41:00 +00:00
Chris Lattner
d137ab4783 Fix PR2553 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@53715 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-07-17 06:07:20 +00:00
Owen Anderson
b31b06d04b Factor MergeBlockIntoPredecessor out into BasicBlockUtils. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@53705 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-07-17 00:01:40 +00:00
Owen Anderson
5d0af038a7 There's no need to iterate block merging and PRE. In fact, iterating the latter 
could cause problems for memdep when it breaks critical edges.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@53691 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-07-16 17:52:31 +00:00
Matthijs Kooijman
780ae5e179 Redo InstCombiner::visitExtractValueInst. Instead of using the (complicate) 
FindInsertedValue, it now performs a number of simple transformations that
should result in the same effect when applied iteratively.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@53673 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-07-16 12:55:45 +00:00
Evan Cheng
be8efa54b6 Fix PR2296. Do not transform x86_sse2_storel_dq into a full-width store. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@53666 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-07-16 07:28:14 +00:00
Owen Anderson
2b4f7bbd49 Revert this, as it seems to still be broken. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@53627 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-07-15 17:59:02 +00:00
Owen Anderson
b33f7cc7e6 Enable local PRE by default. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@53616 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-07-15 16:28:23 +00:00
Owen Anderson
961edc8be6 Have GVN do a pre-pass over the CFG that folds away unconditional branches where possible. This allows local PRE to be more aggressive. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@53615 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-07-15 16:28:06 +00:00
Dan Gohman
3fea643fb4 Fix uninitialized use of the Changed variable. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@53564 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-07-14 17:55:01 +00:00
Chris Lattner
fdb19e5887 Fix PR2506 by being a bit more careful about reverse fact propagation when 
disproving a condition.  This actually compiles the existing testcase
(udiv_select_to_select_shift) to:

define i64 @test(i64 %X, i1 %Cond) {
entry:
	%divisor1.t = lshr i64 %X, 3		; <i64> [#uses=1]
	%quotient2 = lshr i64 %X, 3		; <i64> [#uses=1]
	%sum = add i64 %divisor1.t, %quotient2		; <i64> [#uses=1]
	ret i64 %sum
}

instead of:

define i64 @test(i64 %X, i1 %Cond) {
entry:
	%quotient1.v = select i1 %Cond, i64 3, i64 4		; <i64> [#uses=1]
	%quotient1 = lshr i64 %X, %quotient1.v		; <i64> [#uses=1]
	%quotient2 = lshr i64 %X, 3		; <i64> [#uses=1]
	%sum = add i64 %quotient1, %quotient2		; <i64> [#uses=1]
	ret i64 %sum
}



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@53534 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-07-14 00:15:52 +00:00
Nick Lewycky
3ac9e109b2 Enhance analysis of srem. 
Remove dead code analyzing urem. 'urem' of power-of-2 is canonicalized to an
'and' instruction.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@53506 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-07-12 05:04:38 +00:00
Owen Anderson
c45996bf74 Don't call lookupNumber more than we have to. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@53470 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-07-11 20:05:13 +00:00
Nick Lewycky
7d9843fc37 Document 'mask' in this calculation. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@53454 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-07-11 08:16:26 +00:00
Nick Lewycky
1f26c188f8 Remove misleading constant from comment. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@53452 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-07-11 07:36:19 +00:00
Nick Lewycky
4bf1e59819 Add another optimization from PR2330. Also catch some missing cases that are 
similar.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@53451 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-07-11 07:20:53 +00:00
Chris Lattner
d01bee7170 a missed optimization that Eli spotted 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@53449 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-07-11 06:40:29 +00:00
Chris Lattner
f9685ac68e another bug in the same line. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@53448 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-07-11 06:38:16 +00:00
Chris Lattner
a8ff4a88bb fix a bug spotted by Eli's eagle eyes 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@53447 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-07-11 06:36:01 +00:00
Chris Lattner
183661e43a simplify and merge a bunch of code. Instead of comparing against 
the min/max values for an integer type, compare against the min/max
values we can prove contain the input.  This might be a tighter bound,
so this is general goodness.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@53446 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-07-11 05:40:05 +00:00
Chris Lattner
84dff672a4 fold away (x <= cst) earlier, allowing us to not have to 
handle them in some code.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@53445 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-07-11 05:08:55 +00:00
Chris Lattner
85b5eb0505 Fix folding of icmp's of i1 where the comparison is signed. The code 
was using the algorithm for folding unsigned comparisons which is
completely wrong.  This has been broken since the signless types change.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@53444 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-07-11 04:20:58 +00:00
Chris Lattner
f299184565 Fix a bogus optimization: folding (slt (zext i1 A to i32), 1) -> (slt i1 A, true) 
This cause a regression in InstCombine/JavaCompare, which was doing the right
thing on accident.  To handle the missed case, generalize the comparisons based
on masked bits a little bit to handle comparisons against the max value. For 
example, we can now xform (slt i32 (and X, 4), 4) -> (setne i32 (and X, 4), 4)




git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@53443 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-07-11 04:09:09 +00:00
Nick Lewycky
5dcc41f5b3 Fix overzealous optimization. Thanks to Duncan Sands for pointing out my error! 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@53393 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-07-10 05:51:40 +00:00
Nick Lewycky
d8ad492238 Simplify, suggested by Chris Lattner. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@53283 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-07-09 07:35:26 +00:00
Nick Lewycky
9ee863ecc0 Fold (a < 8) && (b < 8) into (a|b) < 8 for unsigned less or greater than. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@53282 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-07-09 07:29:11 +00:00
Nick Lewycky
d1f77bf931 Fold ((1 << a) & 1) to (a == 0). 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@53276 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-07-09 05:20:13 +00:00
Nick Lewycky
b4d1bc989e Reduce x - y to -y when we know the 'x' part will get masked off anyways. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@53271 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-07-09 04:32:37 +00:00
Devang Patel
a5e27f8028 If loop induction variable's start value is less then its exit value then do not split the loop. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@53265 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-07-09 00:12:01 +00:00
Chris Lattner
710429645a Fix PR2496, a really nasty bug which involved sinking volatile loads 
into phis.  This is actually the same bug as PR2262 /
2008-04-29-VolatileLoadDontMerge.ll, but I missed checking the first 
predecessor for multiple successors.  Testcase here:
InstCombine/2008-07-08-VolatileLoadMerge.ll



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@53240 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-07-08 17:18:32 +00:00
Evan Cheng
1ce75dcbbc Fix two serious LSR bugs. 
1. LSR runOnLoop is always returning false regardless if any transformation is made.
2. AddUsersIfInteresting can create new instructions that are added to DeadInsts. But there is a later early exit which prevents them from being freed.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@53193 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-07-07 19:51:32 +00:00
Dan Gohman
6b345ee9b2 Make DenseMap's insert return a pair, to more closely resemble std::map. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@53177 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-07-07 17:46:23 +00:00
Nick Lewycky
b8cd6a49b5 Fix missed optimization opportunity when analyzing cast of mul and select. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@53151 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-07-05 21:19:34 +00:00
Owen Anderson
0ae33ef202 Use information already present in the ValueTable to fast-fail when we know there won't be a value number match. This speeds up GVN on a case where there are very few redundancies by ~25%. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@53108 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-07-03 17:44:33 +00:00
Devang Patel
77a01136ff Do not try to update dominator info while manipulating CFG. This code does not handle all cases and keeps invalid dom info around some cases, which misleads other passes down stream. 
Right now, dom info is recaluclated in the end if the loop is switched.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@53106 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-07-03 17:37:52 +00:00
Owen Anderson
9da02b844f Remove the ability for ADCE to remove unreachable blocks in loop nests, because, as Eli pointed out, SimplifyCFG already does this. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@53104 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-07-03 17:21:41 +00:00
Bill Wendling
38976dc394 Remove unused function. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@53090 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-07-03 07:10:03 +00:00
Devang Patel
98260a474c Preserve dom info. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@53089 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-07-03 07:04:22 +00:00
Devang Patel
f31b3bbd10 Remove extra FIXME 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@53087 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-07-03 06:50:04 +00:00
Devang Patel
4be7d294f8 Reconstruct dom info, if loop is unswitched. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@53086 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-07-03 06:48:21 +00:00
Devang Patel
b76247b8b1 LoopUnswitch does not preserve dominator info in all cases. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@53085 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-07-03 05:55:03 +00:00
Devang Patel
825cb98d9a Undo previous patch. It is not that simple to fix dom info here. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@53062 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-07-03 00:08:13 +00:00
Devang Patel
501e763dfe Preserve dom info while simplifing loop after the unswitch. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@53052 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-07-02 22:58:54 +00:00
Owen Anderson
ea6462bfd0 Use df_ext_iterator to capture the reachable set without allocating an extra set. 
Also, move large sets and vectors out of instance variables and onto the stack,
and give them more reasonable sizes.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@53044 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-07-02 18:41:09 +00:00
Owen Anderson
cb29a4f66a Avoid a redundant call. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@53040 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-07-02 18:15:31 +00:00
Owen Anderson
77d76b7ef7 Add support to ADCE for pruning unreachable blocks. This addresses the final 
part of PR2509.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@53038 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-07-02 18:05:19 +00:00
Owen Anderson
2c04b0da2b Use DenseSet rather than SmallPtrSet for the alive set. Using SmallPtrSet 
with a huge "size" parameter is actually quite inefficient.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@53034 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-07-02 17:32:04 +00:00
Owen Anderson
f2aa160b35 A better fix for PR2503 that doesn't pessimize GVN in the presence of unreachable blocks. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@53032 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-07-02 17:20:16 +00:00
Devang Patel
1e41f6d724 reuse vectors. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@53007 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-07-02 01:44:29 +00:00
Devang Patel
2095c38c7a Fix comment. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@53006 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-07-02 01:31:19 +00:00
Devang Patel
e6962dfb64 Preserve loop data so that it is not fetched everytime it is needed. 
Keep track of currentLoop.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@53005 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-07-02 01:18:13 +00:00
Evan Cheng
0ff39b3feb - Re-apply 52748 and friends with fix. GetConstantStringInfo() returns an empty string for ConstantAggregateZero case which surprises selectiondag. 
- Correctly handle memcpy from constant string which is zero-initialized.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52891 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-06-30 07:31:25 +00:00
Anton Korobeynikov
6d116bc7ce Revert (52748 and friends): 
Move GetConstantStringInfo to lib/Analysis. Remove
string output routine from Constant. Update all
callers. Change debug intrinsic api slightly to
accomodate move of routine, these now return values
instead of strings.

This unbreaks llvm-gcc bootstrap.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52884 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-06-29 17:57:03 +00:00
Eric Christopher
872a738775 Remove unused function. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52749 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-06-26 01:19:35 +00:00
Eric Christopher
0d2b0aba42 Move GetConstantStringInfo to lib/Analysis. Remove 
string output routine from Constant. Update all
callers. Change debug intrinsic api slightly to
accomodate move of routine, these now return values
instead of strings.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52748 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-06-26 00:31:12 +00:00
Chris Lattner
aa0bf52625 Fix PR2488, a case where we deleted stack restores too aggressively. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52702 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-06-25 05:59:28 +00:00
Dan Gohman
2864ce6065 Fix a typo in a comment. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52687 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-06-24 18:00:21 +00:00
Dan Gohman
cb41e6bf52 Use use_empty() instead of getNumUses(), avoiding a use list traversal. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52651 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-06-23 23:23:49 +00:00
Dan Gohman
73b43b9b54 Fix spelling and grammar in a comment. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52648 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-06-23 22:11:52 +00:00
Evan Cheng
2e9f0b1a32 Disable PRE. It's breaking bootstrapping. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52643 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-06-23 21:22:35 +00:00
Owen Anderson
b70a571c99 Tighten the conditions under which we do PRE, remove some unneeded code, and correct our preserved analyses list, since we 
do now change the CFG by splitting critical edges during PRE.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52631 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-06-23 17:49:45 +00:00
Chris Lattner
2a6a645709 minor tidying of comments. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52630 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-06-23 17:11:23 +00:00
Owen Anderson
ae18bd4246 At Chris' suggestion, move the liveness and worklist datastructures into 
instance variables so they can be allocated just once, and reuse the worklist
as the dead list as well.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52618 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-06-23 06:13:12 +00:00
Dan Gohman
cbfe5bbe88 Improve LSR's dead-phi detection to handle use-def cycles 
with more than two nodes.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52617 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-06-22 20:44:02 +00:00
Dan Gohman
9b78763fce Use Loop::block_iterator. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52616 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-06-22 20:18:58 +00:00
Chris Lattner
963a97f1a3 Fix PR2369 by making scalarrepl more careful about promoting 
structures.  Its default threshold is to promote things that are
smaller than 128 bytes, which is sane.  However, it is not sane
to do this for things that turn into 128 *registers*.  Add a cap
on the number of registers introduced, defaulting to 128/4=32.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52611 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-06-22 17:46:21 +00:00
Eli Friedman
5c1f172213 Fix for PR2479: correctly optimize expressions like (a > 13) & (a == 
15).

See also PR1800, which is about the signed case.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52608 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-06-21 23:36:13 +00:00
Dan Gohman
1adec83ae8 Use Instruction::eraseFromParent(). 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52606 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-06-21 22:08:46 +00:00
Evan Cheng
4ce138cc55 Enable PRE. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52574 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-06-21 07:26:53 +00:00
Dan Gohman
60ea268645 Tidy up some commments and use the getAggregateOperand and 
getInsertedValueOperand accessors. Thanks Matthijs!


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52543 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-06-20 16:41:17 +00:00
Dan Gohman
dfaceb49fc Fix the conditions under which SCCP should examine insertvalue 
instructions. Thanks to Matthijs Kooijman for pointing this out!


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52542 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-06-20 16:39:44 +00:00
Owen Anderson
f2204d7bb1 Really disable PRE. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52531 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-06-20 08:59:13 +00:00
Chris Lattner
2de3fec61c Fix PR2471, which is a bug involving an invalid promotion from a conditional load. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52525 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-06-20 05:12:56 +00:00
Owen Anderson
6fafe847b2 Change around the data structures used to store availability sets, resulting in a GVN+PRE that is faster that GVN alone was before. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52521 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-06-20 01:15:47 +00:00
Dan Gohman
c4b65ea56b Teach SCCP about insertvalue and extractvalue, and about 
propagating constants across aggregate return values when
insertvalue and extractvalue are used.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52520 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-06-20 01:15:44 +00:00
Evan Cheng
88d11c03cd Disable PRE for now. It seems to be breaking llvm-gcc bootstrapping. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52518 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-06-20 01:01:07 +00:00
Owen Anderson
aa0b63422a Add a hidden -disable-pre flag for testing purposes. This should be removed 
once benchmarking is completed.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52506 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-06-19 19:57:25 +00:00
Owen Anderson
5c274eebc6 PRE requires that critical edges be split. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52505 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-06-19 19:54:19 +00:00
Bill Wendling
ac151da204 Remove dead code causing a warning. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52502 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-06-19 18:00:44 +00:00
Owen Anderson
9da52dce89 Be sure to remove values from the value numbering table after we delete them. 
This fixes a failure on povray.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52499 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-06-19 17:53:26 +00:00
Dan Gohman
d02d917c72 Use Instruction::moveBefore instead of manipulating the instruction list 
directly.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52498 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-06-19 17:47:47 +00:00
Dan Gohman
610c0e2b40 Avoid using BasicBlock::getInstList directly in a few places. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52497 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-06-19 17:37:25 +00:00
Owen Anderson
3cd8eb314a Revert support for insertvalue and extractvalue instructions for the moment. 
GVN expects that all inputs which to an instruction fall somewhere in the value
hierarchy, which isn't true for these.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52496 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-06-19 17:25:39 +00:00
Owen Anderson
d34ac6e782 Add support for extractvalue and insertvalue instructions in GVN. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52472 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-06-18 21:59:00 +00:00
Owen Anderson
b230372437 Add local PRE to GVN. This only operates in cases where it would not increase code size, namely when the instantiated expression 
would only need to be created in one predecessor.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52471 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-06-18 21:41:49 +00:00
Chris Lattner
6c3bfba06e Fix the regressions on sext-misc.ll my patch yesterday caused. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52466 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-06-18 18:11:55 +00:00
Dan Gohman
cfeb6a4506 Move LSR's private isZero function to a public SCEV member 
function, and make use of it in several places.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52463 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-06-18 16:23:07 +00:00
Chris Lattner
0521e3cdc1 implement some simple bswap optimizations, rdar://5992453 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52442 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-06-18 04:33:20 +00:00
Chris Lattner
8114b718c9 make truncate/sext elimination capable of changing phi's. This 
implements rdar://6013816 and the testcase in Transforms/InstCombine/sext-misc.ll.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52440 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-06-18 04:00:49 +00:00
Devang Patel
64cd658223 Preserve dominance frontier while trivially unswitching loop. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52438 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-06-18 02:16:38 +00:00
Owen Anderson
2960ed4b85 We don't want to find dependencies within the same block in this case. It leads to incorrect results because 
we're detecting something at or after the call we're querying on.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52433 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-06-17 22:27:06 +00:00
Duncan Sands
34b176a181 Fix typo that changed the logic to something wrong. 
Spotted by Nick Lewycky.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52411 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-06-17 15:55:30 +00:00
Dan Gohman
9b93dd1f1a Refine the change in r52258 for avoiding use-before-def conditions 
when changing the stride of a comparison so that it's slightly
more precise, by having it scan the instruction list to determine
if there is a use of the condition after the point where the
condition will be inserted.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52371 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-06-16 22:34:15 +00:00
Evan Cheng
72b7b098c7 Switch over to SetVector to ensure same order of iterations do not vary across runs. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52361 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-06-16 21:08:17 +00:00
Evan Cheng
69d5053f9c Iterating over SmallPtrSet is not deterministic. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52339 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-06-16 18:17:09 +00:00
Matthijs Kooijman
0a7413dad8 Pass around Instruction* instead of Instruction& in FindInsertedValue and friends. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52318 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-06-16 13:13:08 +00:00
Matthijs Kooijman
710eb236e6 80 column fixes. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52316 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-06-16 12:57:37 +00:00
Matthijs Kooijman
b23d5adbc8 Move FindScalarValue from InstructionCombining.cpp to ValueTracking.cpp. While 
I'm at it, rename it to FindInsertedValue.

The only functional change is that newly created instructions are no longer
added to instcombine's worklist, but that is not really necessary anyway (and
I'll commit some improvements next that will completely remove the need).


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52315 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-06-16 12:48:21 +00:00
Chris Lattner
077707ccc0 Fix the crash on SimplifyLibCalls/2005-05-20-sprintf-crash.ll 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52295 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-06-16 04:10:21 +00:00
Chris Lattner
c5dc660ea0 Fix a case where tailcallelim wouldn't set the changed bit when it made a change. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52267 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-06-14 00:49:48 +00:00
Eli Friedman
6903a24f32 Don't skip over instructions other than loads that might read memory 
when trying to sink stores.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52259 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-06-13 22:02:12 +00:00
Dan Gohman
e562b1725e Protect ChangeCompareStride from situations in which it is possible 
for it to generate use-before-def IR, such as in this testcase.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52258 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-06-13 21:43:41 +00:00
Eli Friedman
66fe80aa57 Make sure SimplifyStoreAtEndOfBlock doesn't mess with loops; the 
structure checks are incorrect if the blocks aren't distinct.
Fixes PR2435.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52257 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-06-13 21:17:49 +00:00
Wojciech Matyjewicz
900872186d Use recently added getTruncateOrZeroExtend method to make the code shorter. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52251 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-06-13 17:02:03 +00:00
Gabor Greif
52ed363fd3 fix a minor deviation from the original in my previous commit 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52247 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-06-12 21:51:29 +00:00
Gabor Greif
177dd3ff11 op_iterator-ify some loops, low hanging fruit only, there is more 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52246 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-06-12 21:37:33 +00:00