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llvm-6502/test/Transforms
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Philip Reames b835f3446f Remove dead zero store to calloc initialized memory 
Optimize the following IR:

%1 = tail call noalias i8* @calloc(i64 1, i64 4)
%2 = bitcast i8* %1 to i32*
; This store is dead and should be removed
store i32 0, i32* %2, align 4

Memory returned by calloc is guaranteed to be zero initialized. If the value being stored is the constant zero (and the store is not otherwise observable across threads), we can delete the store.  If the store is to an out of bounds address, it is undefined and thus also removable.

Reviewed By: nicholas

Differential Revision: http://reviews.llvm.org/D3942




git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@214897 91177308-0d34-0410-b5e6-96231b3b80d8
2014-08-05 17:48:20 +00:00
..
ADCE
AddDiscriminators Fix bug 19437 - Only add discriminators for DWARF 4 and above. 2014-04-17 22:33:50 +00:00
ArgumentPromotion ArgPromo+DebugInfo: Handle updating debug info over multiple applications of argument promotion. 2014-07-23 22:09:29 +00:00
AtomicExpandLoadLinked/ARM CodeGen: it turns out that NAND is not the same thing as BIC. At all. 2014-07-07 09:06:35 +00:00
BBVectorize Reduce verbiage of lit.local.cfg files 2014-06-09 22:42:55 +00:00
BranchFolding Re-commit: Demote EmitRawText call in AsmPrinter::EmitInlineAsm() and remove hasRawTextSupport() call 2014-02-13 14:44:26 +00:00
CodeExtractor
CodeGenPrepare CodeGenPrep: fall back to MVT::Other if instruction's type isn't an EVT. 2014-07-29 10:20:22 +00:00
ConstantHoisting [ConstantHoisting][X86] Improve the cost model for small constants with large types (i64 and above). 2014-06-10 00:32:29 +00:00
ConstantMerge Remove the linker_private and linker_private_weak linkages. 2014-03-13 23:18:37 +00:00
ConstProp Look through addrspacecast in IsConstantOffsetFromGlobal 2014-07-14 22:39:26 +00:00
CorrelatedValuePropagation
DeadArgElim IR: Change inalloca's grammar a bit 2014-03-09 06:41:58 +00:00
DeadStoreElimination Remove dead zero store to calloc initialized memory 2014-08-05 17:48:20 +00:00
DebugIR
EarlyCSE
FunctionAttrs When analyzing params/args for readnone/readonly, don't forget to consider that a pointer argument may be passed through a callsite to the return, and that we may need to analyze it. Fixes a bug reported on llvm-dev: http://lists.cs.uiuc.edu/pipermail/llvmdev/2014-May/073098.html 2014-05-30 02:31:27 +00:00
GCOVProfiling Fix coverage for files with global constructors again. Adds a testcase to the commit from r206671, as requested by David Blaikie. 2014-06-05 04:31:43 +00:00
GlobalDCE Use "weak alias" instead of "alias weak" 2014-07-30 22:51:54 +00:00
GlobalOpt Use "weak alias" instead of "alias weak" 2014-07-30 22:51:54 +00:00
GVN Use "weak alias" instead of "alias weak" 2014-07-30 22:51:54 +00:00
IndVarSimplify Add a description to the test from r211433 explaining why it's written that way. 2014-06-22 12:22:04 +00:00
Inline Convert noalias parameter attributes into noalias metadata during inlining 2014-07-25 15:50:08 +00:00
InstCombine This patch implements transform for pattern "(A & ~B) ^ (~A) -> ~(A & B)". 2014-08-01 05:07:20 +00:00
InstMerge MergedLoadStoreMotion pass 2014-07-18 19:13:09 +00:00
InstSimplify InstSimplify: Simplify (X - (0 - Y)) if the second sub is NUW 2014-07-31 04:49:18 +00:00
Internalize Use "weak alias" instead of "alias weak" 2014-07-30 22:51:54 +00:00
IPConstantProp No need for those tests to go thru llvm-as and/or llvm-dis. 2014-05-27 22:03:28 +00:00
JumpThreading Fixed jump threading going to infinite loop. 2014-06-17 14:34:19 +00:00
LCSSA
LICM Make Value::isDereferenceablePointer handle offsets to pointer types with dereferenceable attributes 2014-07-19 03:25:16 +00:00
LoadCombine Add LoadCombine pass. 2014-05-29 01:55:07 +00:00
LoopDeletion
LoopIdiom R600: Implement TTI:getPopcntSupport 2014-07-18 06:07:13 +00:00
LoopReroll
LoopRotate [LPM] Fix PR18643, another scary place where loop transforms failed to 2014-01-29 13:16:53 +00:00
LoopSimplify No need for those tests to go thru llvm-as and/or llvm-dis. 2014-05-27 22:03:28 +00:00
LoopStrengthReduce Reduce verbiage of lit.local.cfg files 2014-06-09 22:42:55 +00:00
LoopUnroll After unrolling a loop with llvm.loop.unroll.count metadata (unroll factor 2014-07-24 22:36:40 +00:00
LoopUnswitch
LoopVectorize Add diagnostics to the vectorizer cost model. 2014-08-02 00:14:03 +00:00
LowerAtomic IR: add "cmpxchg weak" variant to support permitted failure. 2014-06-13 14:24:07 +00:00
LowerExpectIntrinsic Lower llvm.expect intrinsic correctly for i1 2014-02-02 22:43:55 +00:00
LowerInvoke Remove LowerInvoke's obsolete "-enable-correct-eh-support" option 2014-03-20 19:54:47 +00:00
LowerSwitch Added test for commit r212802 that was missing 2014-07-11 10:36:00 +00:00
Mem2Reg
MemCpyOpt Don't eliminate memcpy's when the address of the pointer may itself be relevant. Fixes PR18304. Patch by David Wiberg! 2014-07-14 18:52:02 +00:00
MergeFunc MergeFunc patch from Björn Steinbrink. 2014-07-15 10:46:51 +00:00
MetaRenamer Use "weak alias" instead of "alias weak" 2014-07-30 22:51:54 +00:00
ObjCARC Fix use_iterator crash in ObjCArc from r203364 2014-03-18 22:32:43 +00:00
PartiallyInlineLibCalls PartiallyInlineLibCalls: Check sqrt result type before transforming it. 2014-08-01 23:21:21 +00:00
PhaseOrdering
PruneEH
Reassociate [Reassociate] FileCheckize and cleanup a few testcases. No functional change 2014-06-11 18:28:45 +00:00
Reg2Mem
SampleProfile Tolerate unmangled names in sample profiles. 2014-03-18 12:03:12 +00:00
Scalarizer
ScalarRepl Fix PR18800. llvm intrinsic memcpy takes 5 arguments void @llvm.memcpy.p0i8.p0i8.i32(i8* <dest>, i8* <src>, i32 <len>, i32 <align>, i1 <isvolatile>).The test case incorrectly uses the old format resulting in isVolatile function in MemIntrinsic to crash during SROA transformation.Modified the test case to use correct signature of memcpy and memset. 2014-03-13 04:50:29 +00:00
SCCP SCCP: update for cmpxchg returning { iN, i1 } now. 2014-06-13 14:54:09 +00:00
SeparateConstOffsetFromGEP/NVPTX Partially revert r210444 due to performance regression 2014-07-16 23:25:00 +00:00
SimplifyCFG [SimplifyCFG] fix accessing deleted PHINodes in switch-to-table conversion. 2014-08-02 23:41:54 +00:00
Sink Sink: Don't sink static allocas from the entry block 2014-03-21 15:51:51 +00:00
SLPVectorizer Teach the SLP Vectorizer that keeping some values live over a callsite can have a cost. 2014-08-05 12:30:34 +00:00
SROA SROA: Only split loads on byte boundaries 2014-06-17 00:19:35 +00:00
StripSymbols Add a debug info code generation level to the compile unit metadata 2014-02-27 01:24:56 +00:00
StructurizeCFG
TailCallElim We may visit a call that uses an alloca multiple times in callUsesLocalStack, sometimes with IsNocapture true and sometimes with IsNocapture false. We accidentally skipped work we needed to do in the IsNocapture=false case if we were called with IsNocapture=true the first time. Fixes PR20405! 2014-07-23 06:24:49 +00:00
TailDup Reduce verbiage of lit.local.cfg files 2014-06-09 22:42:55 +00:00