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