1; Test that the memcmp library call simplifier works correctly. 2; 3; RUN: opt < %s -instcombine -S | FileCheck %s 4 5target datalayout = "e-p:32:32:32-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-f32:32:32-f64:32:64-v64:64:64-v128:128:128-a0:0:64-f80:128:128" 6 7@foo = constant [4 x i8] c"foo\00" 8@hel = constant [4 x i8] c"hel\00" 9@hello_u = constant [8 x i8] c"hello_u\00" 10 11declare i32 @memcmp(i8*, i8*, i32) 12 13; Check memcmp(mem, mem, size) -> 0. 14 15define i32 @test_simplify1(i8* %mem, i32 %size) { 16; CHECK-LABEL: @test_simplify1( 17 %ret = call i32 @memcmp(i8* %mem, i8* %mem, i32 %size) 18 ret i32 %ret 19; CHECK: ret i32 0 20} 21 22; Check memcmp(mem1, mem2, 0) -> 0. 23 24define i32 @test_simplify2(i8* %mem1, i8* %mem2) { 25; CHECK-LABEL: @test_simplify2( 26 %ret = call i32 @memcmp(i8* %mem1, i8* %mem2, i32 0) 27 ret i32 %ret 28; CHECK: ret i32 0 29} 30 31;; Check memcmp(mem1, mem2, 1) -> *(unsigned char*)mem1 - *(unsigned char*)mem2. 32 33define i32 @test_simplify3(i8* %mem1, i8* %mem2) { 34; CHECK-LABEL: @test_simplify3( 35 %ret = call i32 @memcmp(i8* %mem1, i8* %mem2, i32 1) 36; CHECK: [[LOAD1:%[a-z]+]] = load i8, i8* %mem1, align 1 37; CHECK: [[ZEXT1:%[a-z]+]] = zext i8 [[LOAD1]] to i32 38; CHECK: [[LOAD2:%[a-z]+]] = load i8, i8* %mem2, align 1 39; CHECK: [[ZEXT2:%[a-z]+]] = zext i8 [[LOAD2]] to i32 40; CHECK: [[RET:%[a-z]+]] = sub nsw i32 [[ZEXT1]], [[ZEXT2]] 41 ret i32 %ret 42; CHECK: ret i32 [[RET]] 43} 44 45; Check memcmp(mem1, mem2, size) -> cnst, where all arguments are constants. 46 47define i32 @test_simplify4() { 48; CHECK-LABEL: @test_simplify4( 49 %mem1 = getelementptr [4 x i8], [4 x i8]* @hel, i32 0, i32 0 50 %mem2 = getelementptr [8 x i8], [8 x i8]* @hello_u, i32 0, i32 0 51 %ret = call i32 @memcmp(i8* %mem1, i8* %mem2, i32 3) 52 ret i32 %ret 53; CHECK: ret i32 0 54} 55 56define i32 @test_simplify5() { 57; CHECK-LABEL: @test_simplify5( 58 %mem1 = getelementptr [4 x i8], [4 x i8]* @hel, i32 0, i32 0 59 %mem2 = getelementptr [4 x i8], [4 x i8]* @foo, i32 0, i32 0 60 %ret = call i32 @memcmp(i8* %mem1, i8* %mem2, i32 3) 61 ret i32 %ret 62; CHECK: ret i32 1 63} 64 65define i32 @test_simplify6() { 66; CHECK-LABEL: @test_simplify6( 67 %mem1 = getelementptr [4 x i8], [4 x i8]* @foo, i32 0, i32 0 68 %mem2 = getelementptr [4 x i8], [4 x i8]* @hel, i32 0, i32 0 69 %ret = call i32 @memcmp(i8* %mem1, i8* %mem2, i32 3) 70 ret i32 %ret 71; CHECK: ret i32 -1 72} 73