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36 lines
1.2 KiB
LLVM
36 lines
1.2 KiB
LLVM
; Test that the memcmpOptimizer works correctly
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; RUN: opt < %s -simplify-libcalls -S | FileCheck %s
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@h = constant [2 x i8] c"h\00" ; <[2 x i8]*> [#uses=0]
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@hel = constant [4 x i8] c"hel\00" ; <[4 x i8]*> [#uses=0]
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@hello_u = constant [8 x i8] c"hello_u\00" ; <[8 x i8]*> [#uses=0]
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declare i32 @memcmp(i8*, i8*, i32)
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define void @test(i8* %P, i8* %Q, i32 %N, i32* %IP, i1* %BP) {
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%A = call i32 @memcmp( i8* %P, i8* %P, i32 %N ) ; <i32> [#uses=1]
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; CHECK-NOT: call {{.*}} memcmp
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; CHECK: volatile store
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volatile store i32 %A, i32* %IP
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%B = call i32 @memcmp( i8* %P, i8* %Q, i32 0 ) ; <i32> [#uses=1]
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; CHECK-NOT: call {{.*}} memcmp
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; CHECK: volatile store
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volatile store i32 %B, i32* %IP
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%C = call i32 @memcmp( i8* %P, i8* %Q, i32 1 ) ; <i32> [#uses=1]
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; CHECK: load
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; CHECK: zext
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; CHECK: load
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; CHECK: zext
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; CHECK: sub
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; CHECK: volatile store
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volatile store i32 %C, i32* %IP
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%F = call i32 @memcmp(i8* getelementptr ([4 x i8]* @hel, i32 0, i32 0),
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i8* getelementptr ([8 x i8]* @hello_u, i32 0, i32 0),
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i32 3)
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; CHECK-NOT: call {{.*}} memcmp
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; CHECK: volatile store
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volatile store i32 %F, i32* %IP
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ret void
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}
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