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Change greater than to greater than or equal so that an identical sized store to the same offset is treated as completing overwriting.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@161857 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Craig Topper 2012-08-14 07:32:05 +00:00
parent bb57febe3c
commit 750d7616c6
2 changed files with 20 additions and 1 deletions
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2
lib/Transforms/Scalar/DeadStoreElimination.cpp
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@ -378,7 +378,7 @@ static OverwriteResult isOverwrite(const AliasAnalysis::Location &Later,
//
// We have to be careful here as *Off is signed while *.Size is unsigned.
if (EarlierOff >= LaterOff &&
Later.Size > Earlier.Size &&
Later.Size >= Earlier.Size &&
uint64_t(EarlierOff - LaterOff) + Earlier.Size <= Later.Size)
return OverwriteComplete;

19
test/Transforms/DeadStoreElimination/simple.ll
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@ -291,3 +291,22 @@ define noalias i8* @test23() nounwind uwtable ssp {
%call = call i8* @strdup(i8* %arrayidx) nounwind
ret i8* %call
}
; Make sure same sized store to later element is deleted
; CHECK: @test24
; CHECK-NOT: store i32 0
; CHECK-NOT: store i32 0
; CHECK: store i32 %b
; CHECK: store i32 %c
; CHECK: ret void
define void @test24([2 x i32]* %a, i32 %b, i32 %c) nounwind {
%1 = getelementptr inbounds [2 x i32]* %a, i64 0, i64 0
store i32 0, i32* %1, align 4
%2 = getelementptr inbounds [2 x i32]* %a, i64 0, i64 1
store i32 0, i32* %2, align 4
%3 = getelementptr inbounds [2 x i32]* %a, i64 0, i64 0
store i32 %b, i32* %3, align 4
%4 = getelementptr inbounds [2 x i32]* %a, i64 0, i64 1
store i32 %c, i32* %4, align 4
ret void
}