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4194 Commits

Author SHA1 Message Date
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
Evan Cheng
502a4f5162 Do not speculatively execute an instruction by hoisting it to its predecessor BB if any of its operands are defined but not used in BB. The transformation will prevent the operand from being sunk into the use block. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52244 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-06-12 21:15:59 +00:00
Evan Cheng
0d0ca8572f Revert 52223. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52243 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-06-12 20:55:39 +00:00
Owen Anderson
af4240ac2d Switch GVN to use ScopedHashTable. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52242 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-06-12 19:25:32 +00:00
Gabor Greif
6725cb5f1c op_iterator-ify some loops, fix 80col violations 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52226 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-06-11 21:38:51 +00:00
Evan Cheng
797d95188d For now, avoid generating FP select instructions in order to speculatively execute integer arithmetic instructions. FP selects are more likely to be expensive (even compared to branch on fcmp). This is not a wonderful solution but I rather err on the side of conservative. 
This fixes the heapsort performance regressions.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52224 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-06-11 19:18:20 +00:00
Evan Cheng
bb318c073e Avoid duplicating loop header which leads to unnatural loops (and just seem like general badness to me, likely to cause code explosion). 
Patch by Florian Brandner.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52223 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-06-11 19:07:54 +00:00
Matthijs Kooijman
a9012eca1a Teach instruction combining about the extractvalue. It can succesfully fold 
useless insert-extract chains, similar to how it folds them for vectors.

Add a testcase for this.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52217 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-06-11 14:05:05 +00:00
Matthijs Kooijman
b4d6a5a76c Clarify a comment. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52212 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-06-11 09:00:12 +00:00
Gabor Greif
f7ea3638e0 op_iterator-ify loops 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52191 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-06-10 22:03:26 +00:00
Chris Lattner
313f0e63f7 lower calls to abs to inline code, PR2337 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52138 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-06-09 08:26:51 +00:00
Chris Lattner
18d73c206e Fix PR2411, where ip constant prop would propagate the 
result of a weak function.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52137 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-06-09 07:58:07 +00:00
Duncan Sands
8e4eb09b1e Remove comparison methods for MVT. The main cause 
of apint codegen failure is the DAG combiner doing
the wrong thing because it was comparing MVT's using
< rather than comparing the number of bits.  Removing
the < method makes this mistake impossible to commit.
Instead, add helper methods for comparing bits and use
them.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52098 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-06-08 20:54:56 +00:00
Chris Lattner
7d8ab4efbc Limit the icmp+phi merging optimization to the cases where it is profitable: 
don't make i1 phis when it won't be possible to eliminate them.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52097 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-06-08 20:52:11 +00:00
Evan Cheng
4d09efd7b8 Speculatively execute a block when the the block is the then part of a triangle shape and it contains a single, side effect free, cheap instruction. The branch is eliminated by adding a select instruction. i.e. 
Turn                                                                                                                                                                                                       
BB:                                                                                                                                                                                                        
    %t1 = icmp                                                                                                                                                                                             
    br i1 %t1, label %BB1, label %BB2                                                                                                                                                                      
BB1:                                                                                                                                                                                                       
    %t3 = add %t2, c                                                                                                                                                                                       
    br label BB2                                                                                                                                                                                           
BB2:                                                                                                                                                                                                       
=>                                                                                                                                                                                                         
BB:                                                                                                                                                                                                        
    %t1 = icmp                                                                                                                                                                                             
    %t4 = add %t2, c                                                                                                                                                                                       
    %t3 = select i1 %t1, %t2, %t3


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52073 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-06-07 08:52:29 +00:00
Devang Patel
4c37c07ee3 LoopSimplify preserves AA. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52053 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-06-06 17:50:58 +00:00
Duncan Sands
83ec4b6711 Wrap MVT::ValueType in a struct to get type safety 
and better control the abstraction.  Rename the type
to MVT.  To update out-of-tree patches, the main
thing to do is to rename MVT::ValueType to MVT, and
rewrite expressions like MVT::getSizeInBits(VT) in
the form VT.getSizeInBits().  Use VT.getSimpleVT()
to extract a MVT::SimpleValueType for use in switch
statements (you will get an assert failure if VT is
an extended value type - these shouldn't exist after
type legalization).
This results in a small speedup of codegen and no
new testsuite failures (x86-64 linux).


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52044 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-06-06 12:08:01 +00:00
Zhou Sheng
cc41940dff As Chris suggested, handle the situation if ShAmt larger than BitWidth, 
otherwise, opt might crash.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52041 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-06-06 08:32:05 +00:00
Zhou Sheng
17183ab973 If BitWidth equals to ShtAmt, the RHSKnownZero[BitWidth-ShiftAmt-1] will 
crash the opt. Just fix this.

Test case in llvm/test/Transforms/InstCombine/2008-06-05-ashr-crash.ll


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52003 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-06-05 14:23:44 +00:00
Matthijs Kooijman
02518140ac Learn ScalarReplAggregrates how stores and loads of first class aggregrates 
work and how to replace them into individual values. Also, when trying to
replace an aggregrate that is used by load or store with a single (large)
integer, don't crash (but don't replace the aggregrate either).

Also adds a testcase for both structs and arrays.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@51997 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-06-05 12:51:53 +00:00
Matthijs Kooijman
47c6fd7317 Let StructRetPromotion check if all if its users are really calls or invokesn, 
not other instructions. This fixes a crash with the added testcase.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@51992 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-06-05 08:57:20 +00:00
Matthijs Kooijman
257da0a7fc Let StructRetPromotion check if it's users are really calling it and not 
passing its pointer. Fixes test with added testcase.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@51991 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-06-05 08:48:32 +00:00
Matthijs Kooijman
41335411a8 Use use_iterator::getOperandNo instead of CallSite::hasArgument to check if a 
function is passed as an argument instead of called. Also do this check a bit
earlier.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@51990 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-06-05 08:34:25 +00:00
Matthijs Kooijman
845f524c25 Update comments and documentation to reflect that GCSE and ValueNumbering are 
deprecated by the GVN and GVNPRE passes.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@51983 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-06-05 07:55:49 +00:00
Owen Anderson
10a05bfff0 Remove unneeded #include. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@51955 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-06-04 18:28:10 +00:00
Matthijs Kooijman
227c27dd06 Replace two manual loops with calls to CallSite::hasArguments (no functional changes). 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@51947 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-06-04 16:57:50 +00:00
Duncan Sands
a0fcc08e65 Change packed struct layout so that field sizes 
are the same as in unpacked structs, only field
positions differ.  This only matters for structs
containing x86 long double or an apint; it may
cause backwards compatibility problems if someone
has bitcode containing a packed struct with a
field of one of those types.
The issue is that only 10 bytes are needed to
hold an x86 long double: the store size is 10
bytes, but the ABI size is 12 or 16 bytes (linux/
darwin) which comes from rounding the store size
up by the alignment.  Because it seemed silly not
to pack an x86 long double into 10 bytes in a
packed struct, this is what was done.  I now
think this was a mistake.  Reserving the ABI size
for an x86 long double field even in a packed
struct makes things more uniform: the ABI size is
now always used when reserving space for a type.
This means that developers are less likely to
make mistakes.  It also makes life easier for the
CBE which otherwise could not represent all LLVM
packed structs (PR2402).
Front-end people might need to adjust the way
they create LLVM structs - see following change
to llvm-gcc.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@51928 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-06-04 08:21:45 +00:00
Owen Anderson
269db29bdb LoopIndexSplit can sometimes result in cases where a block in its own domfrontier. 
Don't crash when we encounter one of these.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@51915 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-06-03 18:29:48 +00:00
Dan Gohman
c702a9ed1c Fix whitespace in whitespace-significant pseudocode in a comment. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@51890 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-06-03 00:57:21 +00:00
Devang Patel
2f170997b5 Update dom tree. Fix PR 2372. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@51887 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-06-02 22:52:56 +00:00
Chris Lattner
833f25d79e move CannotBeNegativeZero to ValueTracking. Simplify some signbit comparisons. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@51864 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-06-02 01:29:46 +00:00
Chris Lattner
173234a68f move ComputeMaskedBits, MaskedValueIsZero, and ComputeNumSignBits 
out of instcombine into a new file in libanalysis.  This also teaches
ComputeNumSignBits about the number of sign bits in a constantint.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@51863 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-06-02 01:18:21 +00:00
Owen Anderson
009e4f7609 Fix two issues that Eli Friedman pointed out, where would misoptimized code like: 
char a[200];
init(a, a+200);

OR

int a[200];
char* b = (char*)a;
char* c = (char*)a;
foo(b, c);


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@51850 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-06-01 22:26:26 +00:00
Owen Anderson
12cb36c115 Don't remove the memcpy when call slot substitution fails. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@51848 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-06-01 21:52:16 +00:00
Duncan Sands
f413cdfb0b When simplifying a call to a bitcast function, tighten up 
the conditions for performing the transform when only the
function declaration is available: no longer allow turning
i32 into i64 for example.  Only allow changing between
pointer types, and between pointer types and integers of
the same size.  For return values ptr -> intptr was already
allowed; I added ptr -> ptr and intptr -> ptr while there.
As shown by a recent objc testcase, changing the way
parameters/return values are passed can be fatal when calling
code written in assembler that directly manipulates call
arguments and return values unless the transform has no
impact on the way they are passed at the codegen level.
While it is possible to imagine an ABI that treats integers
of pointer size differently to pointers, I don't think LLVM
supports any so the transform should now be safe while still
being useful.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@51834 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-06-01 07:38:42 +00:00
Nick Lewycky
517e1f5cd7 Peer through sext/zext when looking for not(cmp). 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@51819 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-05-31 19:01:33 +00:00
Nick Lewycky
9419ddb289 Add more i1 optimizations. add, sub, mul, s/udiv on i1 are now simplified away. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@51817 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-05-31 17:59:52 +00:00
Nick Lewycky
fd12a0b20b Adding i1 is always Xor. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@51816 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-05-31 17:10:28 +00:00
Gabor Greif
ba2c487424 rewrite operand loops to use iterators 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@51789 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-05-30 21:24:22 +00:00
Owen Anderson
427de86ada Since LCSSA switched over to DenseMap, we have to be more careful to avoid iterator invalidation. Fixes PR2385. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@51777 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-05-30 17:31:01 +00:00
Matthijs Kooijman
494661c623 Use eraseFromParent() instead of doing that manually in two places. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@51770 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-05-30 12:35:46 +00:00
Dan Gohman
b99e2e20b2 const-ify getOpcode. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@51698 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-05-29 19:53:46 +00:00
Duncan Sands
a806a87e29 Add a newline at the end of this file. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@51680 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-05-29 14:38:23 +00:00