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1923 Commits

Author SHA1 Message Date
Bill Wendling
03aae5f7e1 Use m_Specific() instead of double matching. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@60341 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-12-01 08:09:47 +00:00
Chris Lattner
d8aafcb200 simplify these patterns using m_Specific. No need to grep for 
xor in testcase (or is a substring).


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@60328 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-12-01 05:16:26 +00:00
Chris Lattner
05f18920e1 Teach inst combine to merge GEPs through PHIs. This is really 
important because it is sinking the loads using the GEPs, but
not the GEPs themselves.  This triggers 647 times on 403.gcc
and makes the .s file much much nicer.  For example before:

        je      LBB1_87 ## bb78
LBB1_62:        ## bb77
        leal    84(%esi), %eax
LBB1_63:        ## bb79
        movl    (%eax), %eax
...
LBB1_87:        ## bb78
        movl    $0, 4(%esp)
        movl    %esi, (%esp)
        call    L_make_decl_rtl$stub
        jmp     LBB1_62 ## bb77


after:

        jne     LBB1_63 ## bb79
LBB1_62:        ## bb78
        movl    $0, 4(%esp)
        movl    %esi, (%esp)
        call    L_make_decl_rtl$stub
LBB1_63:        ## bb79
        movl    84(%esi), %eax

The input code was (and the GEPs are merged and
the PHI is now eliminated by instcombine):

        br i1 %tmp233, label %bb78, label %bb77
bb77:           
        %tmp234 = getelementptr %struct.tree_node* %t_addr.3, i32 0, i32 0, i32 22              
        br label %bb79
bb78:           
        call void @make_decl_rtl(%struct.tree_node* %t_addr.3, i8* null) nounwind
        %tmp235 = getelementptr %struct.tree_node* %t_addr.3, i32 0, i32 0, i32 22              
        br label %bb79
bb79:           
        %iftmp.12.0.in = phi %struct.rtx_def** [ %tmp235, %bb78 ], [ %tmp234, %bb77 ]           
        %iftmp.12.0 = load %struct.rtx_def** %iftmp.12.0.in             



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@60322 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-12-01 02:34:36 +00:00
Chris Lattner
67afda6c1e testcase for my previous commit. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@60315 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-12-01 01:42:03 +00:00
Bill Wendling
b3833d1eb9 Implement ((A|B)&1)|(B&-2) -> (A&1) | B transformation. This also takes care of 
permutations of this pattern.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@60312 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-12-01 01:07:11 +00:00
Bill Wendling
b01865c210 Add instruction combining for ((A&~B)|(~A&B)) -> A^B and all permutations. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@60291 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-11-30 13:52:49 +00:00
Bill Wendling
7f0ef6b325 Implement (A&((~A)|B)) -> A&B transformation in the instruction combiner. This 
takes care of all permutations of this pattern.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@60290 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-11-30 13:08:13 +00:00
Bill Wendling
6e1783fb4a getSExtValue() doesn't work for ConstantInts with bitwidth > 64 bits. Use all 
APInt calls instead.

This fixes PR3144.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@60288 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-11-30 12:38:24 +00:00
Eli Friedman
d83ae7d698 Optimize memmove and memset into the LLVM builtins. Note that these 
only show up in code from front-ends besides llvm-gcc, like clang.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@60287 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-11-30 08:32:11 +00:00
Bill Wendling
13441c57ec Strengthen check for div inst-combining. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@60276 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-11-30 04:33:53 +00:00
Bill Wendling
e1196d6d3e Instcombine was illegally transforming -X/C into X/-C when either X or C 
overflowed on negation. This commit checks to make sure that neithe C nor X
overflows. This requires that the RHS of X (a subtract instruction) be a
constant integer.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@60275 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-11-30 03:42:12 +00:00
Chris Lattner
cae30afc34 don't require GVN to work on dead values, just make the 
test return the loaded value.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@60252 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-11-29 21:21:48 +00:00
Chris Lattner
3a76be584b Fix a thinko that manifested as a crash on clamav last night. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@60251 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-11-29 20:29:04 +00:00
Chris Lattner
d3d12ecadd Fix PR3141 by ensuring that MemoryDependenceAnalysis::removeInstruction 
properly updates the reverse dependency map when it installs updated 
dependencies for instructions that depend on the removed instruction.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@60222 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-11-28 22:51:08 +00:00
Chris Lattner
f5102a0f08 don't call MergeBasicBlockIntoOnlyPred on a block whose only 
predecessor is itself.  This doesn't make sense, and this is
a dead infinite loop anyway.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@60210 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-11-28 19:54:49 +00:00
Nick Lewycky
8ca5248522 Chris prefers icmp/select over udiv! 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@60187 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-11-27 22:41:10 +00:00
Nick Lewycky
895f085385 Add a couple of missed optimizations on integer vectors. Multiply and divide 
by 1, as well as multiply by -1.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@60182 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-11-27 20:21:08 +00:00
Chris Lattner
3d86d242c6 Fix PR3138: if we merge the entry block into another block, make sure to 
move the other block back up into the entry position!



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@60179 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-11-27 19:25:19 +00:00
Chris Lattner
69e067fdd8 Make jump threading substantially more powerful, in the following ways: 
1. Make it fold blocks separated by an unconditional branch.  This enables
   jump threading to see a broader scope.
2. Make jump threading able to eliminate locally redundant loads when they
   feed the branch condition of a block.  This frequently occurs due to
   reg2mem running.
3. Make jump threading able to eliminate *partially redundant* loads when
   they feed the branch condition of a block.  This is common in code with
   lots of loads and stores like C++ code and 255.vortex.

This implements thread-loads.ll and rdar://6402033.

Per the fixme's, several pieces of this should be moved into Transforms/Utils.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@60148 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-11-27 05:07:53 +00:00
Evan Cheng
88f2d6c167 convertToSignExtendedInteger should return opInvalidOp instead of asserting if sematics of float does not allow arithmetics. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@60042 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-11-25 19:00:29 +00:00
Chris Lattner
8d0d603a0b reenable test 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@59986 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-11-24 21:27:20 +00:00
Bill Wendling
612e0b701f Temporarily XFAIL this test. r59976 and r59972 broke it. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@59981 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-11-24 20:43:33 +00:00
Chris Lattner
47f5751c80 Fix 3113: If we have a dead cyclic PHI, replace the whole thing 
with an undef.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@59972 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-11-24 19:25:36 +00:00
Nick Lewycky
0c73079855 Optimize (x/y)*y into x-(x%y) in general. Div and rem are about the same, and 
a subtract is cheaper than a multiply. This generalizes an existing transform.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@59800 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-11-21 07:33:58 +00:00
Devang Patel
13877bf6c2 Give SIToFPInst preference over UIToFPInst because it is faster on platforms that are widely used. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@59476 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-11-18 00:40:02 +00:00
Devang Patel
cd40233429 While handling floating point IVs lift restrictions on initial value and increment value. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@59471 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-11-17 23:27:13 +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
6093b36f47 make this actually test what it is trying to. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@59386 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-11-16 04:21:51 +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
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
Devang Patel
60886066bf Add PR number. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@58765 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-11-05 18:41:15 +00:00
Devang Patel
c9eaef0bf2 New test case. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@58745 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-11-05 01:40:30 +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
Anton Korobeynikov
879b1ac22e Fix tests not to emit IR output 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@58729 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-11-04 23:02:39 +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
6feb333695 Changes from Duncan's review: 
* merge two weak functions by making them both alias a third non-weak fn
 * don't reimplement CallSite::hasArgument
 * whitelist the safe linkage types


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@58568 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-11-02 16:46:26 +00:00
Nick Lewycky
579a024661 Add a new MergeFunctions pass. It finds identical functions and merges them. 
This triggers only 60 times in llvm-test (look at .llvm.bc, not .linked.rbc)
and so it probably wont be turned on by default. Also, may of those are likely
to go away when PR2973 is fixed.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@58557 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-11-02 05:52:50 +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
Daniel Dunbar
c5e1ec47c7 Add InlineCost class for represent the estimated cost of inlining a 
function.
 - This explicitly models the costs for functions which should
   "always" or "never" be inlined. This fixes bugs where such costs
   were not previously respected.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@58450 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-10-30 19:26:59 +00:00
Chris Lattner
f8131c99de Fix PR2967 by not deleting volatile load/stores that occur before unreachable. 
I don't really see this as being needed, but there is little harm from doing
it.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@58385 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-10-29 17:46:26 +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
Chris Lattner
b457b3c5e7 no need to print output 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@58228 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-10-27 06:56:35 +00:00
Nick Lewycky
04aa2c3520 Don't try to create a mask when we don't need one. Fixes a crash. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@58075 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-10-24 06:14:27 +00:00
Chris Lattner
868510328f apply Eli's patch for PR2165 and provide a testcase. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@57625 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-10-16 05:26:51 +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