forked from OSchip/llvm-project
26 lines
1.1 KiB
LLVM
26 lines
1.1 KiB
LLVM
; Test that the StrNCpyOptimizer works correctly
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; RUN: llvm-as < %s | opt -simplify-libcalls | llvm-dis | \
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; RUN: not grep {call.*strncpy}
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@hello = constant [6 x i8] c"hello\00" ; <[6 x i8]*> [#uses=1]
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@null = constant [1 x i8] zeroinitializer ; <[1 x i8]*> [#uses=1]
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@null_hello = constant [7 x i8] c"\00hello\00" ; <[7 x i8]*> [#uses=1]
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declare i8* @strncpy(i8*, i8*, i32)
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declare i32 @puts(i8*)
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define i32 @main() {
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%target = alloca [1024 x i8] ; <[1024 x i8]*> [#uses=1]
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%arg1 = getelementptr [1024 x i8]* %target, i32 0, i32 0 ; <i8*> [#uses=2]
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store i8 0, i8* %arg1
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%arg2 = getelementptr [6 x i8]* @hello, i32 0, i32 0 ; <i8*> [#uses=1]
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%rslt1 = call i8* @strncpy( i8* %arg1, i8* %arg2, i32 6 ) ; <i8*> [#uses=1]
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%arg3 = getelementptr [1 x i8]* @null, i32 0, i32 0 ; <i8*> [#uses=1]
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%rslt2 = call i8* @strncpy( i8* %rslt1, i8* %arg3, i32 42 ) ; <i8*> [#uses=1]
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%arg4 = getelementptr [7 x i8]* @null_hello, i32 0, i32 0 ; <i8*> [#uses=1]
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%rslt3 = call i8* @strncpy( i8* %rslt2, i8* %arg4, i32 42 ) ; <i8*> [#uses=1]
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call i32 @puts( i8* %rslt3 ) ; <i32>:1 [#uses=0]
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ret i32 0
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}
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