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a935db8ea2
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@51636 91177308-0d34-0410-b5e6-96231b3b80d8
43 lines
1.6 KiB
LLVM
43 lines
1.6 KiB
LLVM
; This test makes sure that memmove instructions are properly eliminated.
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;
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; RUN: llvm-as < %s | opt -instcombine | llvm-dis | \
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; RUN: not grep {call void @llvm.memmove}
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@S = internal constant [33 x i8] c"panic: restorelist inconsistency\00" ; <[33 x i8]*> [#uses=1]
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@h = constant [2 x i8] c"h\00" ; <[2 x i8]*> [#uses=1]
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@hel = constant [4 x i8] c"hel\00" ; <[4 x i8]*> [#uses=1]
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@hello_u = constant [8 x i8] c"hello_u\00" ; <[8 x i8]*> [#uses=1]
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declare void @llvm.memmove.i32(i8*, i8*, i32, i32)
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define void @test1(i8* %A, i8* %B, i32 %N) {
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call void @llvm.memmove.i32( i8* %A, i8* %B, i32 0, i32 1 )
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ret void
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}
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define void @test2(i8* %A, i32 %N) {
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;; dest can't alias source since we can't write to source!
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call void @llvm.memmove.i32( i8* %A, i8* getelementptr ([33 x i8]* @S, i32 0, i32 0), i32 %N, i32 1 )
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ret void
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}
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define i32 @test3() {
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%h_p = getelementptr [2 x i8]* @h, i32 0, i32 0 ; <i8*> [#uses=1]
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%hel_p = getelementptr [4 x i8]* @hel, i32 0, i32 0 ; <i8*> [#uses=1]
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%hello_u_p = getelementptr [8 x i8]* @hello_u, i32 0, i32 0 ; <i8*> [#uses=1]
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%target = alloca [1024 x i8] ; <[1024 x i8]*> [#uses=1]
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%target_p = getelementptr [1024 x i8]* %target, i32 0, i32 0 ; <i8*> [#uses=3]
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call void @llvm.memmove.i32( i8* %target_p, i8* %h_p, i32 2, i32 2 )
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call void @llvm.memmove.i32( i8* %target_p, i8* %hel_p, i32 4, i32 4 )
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call void @llvm.memmove.i32( i8* %target_p, i8* %hello_u_p, i32 8, i32 8 )
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ret i32 0
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}
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; PR2370
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define void @test4(i8* %a) {
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tail call void @llvm.memmove.i32( i8* %a, i8* %a, i32 100, i32 1 )
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ret void
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}
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