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5fac55fafb
This includes not marking a GEP involving a vector as unsafe, but only when it has all zero indices. This allows scalarrepl to work in a few more cases. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@57177 91177308-0d34-0410-b5e6-96231b3b80d8
25 lines
986 B
LLVM
25 lines
986 B
LLVM
; This test checks to see if scalarrepl also works when a gep with all zeroes is
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; used instead of a bitcast to prepare a memmove pointer argument. Previously,
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; this would not work when there was a vector involved in the struct, preventing
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; scalarrepl from removing the alloca below.
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; RUN: llvm-as < %s | opt -scalarrepl | llvm-dis > %t
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; RUN: cat %t | not grep alloca
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%struct.two = type <{ < 2 x i8 >, i16 }>
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define void @main(%struct.two* %D, i16 %V) {
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entry:
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%S = alloca %struct.two
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%S.2 = getelementptr %struct.two* %S, i32 0, i32 1
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store i16 %V, i16* %S.2
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; This gep is effectively a bitcast to i8*, but is sometimes generated
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; because the type of the first element in %struct.two is i8.
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%tmpS = getelementptr %struct.two* %S, i32 0, i32 0, i32 0
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%tmpD = bitcast %struct.two* %D to i8*
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call void @llvm.memmove.i32(i8* %tmpD, i8* %tmpS, i32 4, i32 1)
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ret void
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}
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declare void @llvm.memmove.i32(i8*, i8*, i32, i32) nounwind
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