| ; 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: store volatile |
| store volatile i32 %A, i32* %IP |
| %B = call i32 @memcmp( i8* %P, i8* %Q, i32 0 ) ; <i32> [#uses=1] |
| ; CHECK-NOT: call {{.*}} memcmp |
| ; CHECK: store volatile |
| store volatile 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: store volatile |
| store volatile 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: store volatile |
| store volatile i32 %F, i32* %IP |
| ret void |
| } |
| |