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When InstCombine simplifies a load -> extract element to gep -> load, place

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the new load by the old load instead of by the extract element because
a store could have occurred between the load and extract element.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@78891 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Mon P Wang 2009-08-13 05:12:13 +00:00
parent b808588a3a
commit 7c4efa6808
2 changed files with 28 additions and 3 deletions
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8
lib/Transforms/Scalar/InstructionCombining.cpp
View File

@ -12465,12 +12465,14 @@ Instruction *InstCombiner::visitExtractElementInst(ExtractElementInst &EI) {
unsigned AS =
cast<PointerType>(I->getOperand(0)->getType())->getAddressSpace();
Value *Ptr = InsertBitCastBefore(I->getOperand(0),
PointerType::get(EI.getType(), AS),EI);
PointerType::get(EI.getType(), AS),*I);
GetElementPtrInst *GEP =
GetElementPtrInst::Create(Ptr, EI.getOperand(1), I->getName()+".gep");
cast<GEPOperator>(GEP)->setIsInBounds(true);
InsertNewInstBefore(GEP, EI);
return new LoadInst(GEP);
InsertNewInstBefore(GEP, *I);
LoadInst* Load = new LoadInst(GEP, "tmp");
InsertNewInstBefore(Load, *I);
return ReplaceInstUsesWith(EI, Load);
}
}
if (InsertElementInst *IE = dyn_cast<InsertElementInst>(I)) {

23
test/Transforms/InstCombine/vec_extract_elt2.ll Normal file
View File

@ -0,0 +1,23 @@
; RUN: llvm-as < %s | opt -instcombine | llvm-dis | FileCheck %s
; The load replacing the extract element must occur before the call
; that may modify local array a.
declare void @mod_a_func(<4 x float>* %a);
; CHECK: load float* %arraydecay1, align 16
; CHECK: call void @mod_a_func
define void @cl_jpegenc_k2(<4 x float> addrspace(1)* %src, float addrspace(1)* %dst) {
%a = alloca [2 x <4 x float>], align 16
%arraydecay = getelementptr [2 x <4 x float>]* %a, i32 0, i32 0
%arrayidx31 = getelementptr <4 x float> addrspace(1)* %src, i32 0
%tmp32 = load <4 x float> addrspace(1)* %arrayidx31
store <4 x float> %tmp32, <4 x float>* %arraydecay, align 16
%tmp86 = load <4 x float>* %arraydecay, align 16
call void @mod_a_func(<4 x float>* %arraydecay)
%arrayidx132 = getelementptr float addrspace(1)* %dst, i32 0
%tmp236 = extractelement <4 x float> %tmp86, i32 0
store float %tmp236, float addrspace(1)* %arrayidx132
ret void
}