1 ; Test that the memcmp library call simplifier works correctly. 2 ; 3 ; RUN: opt < %s -instcombine -S | FileCheck %s 4 5 target 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 11 declare i32 @memcmp(i8*, i8*, i32) 12 13 ; Check memcmp(mem, mem, size) -> 0. 14 15 define 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 24 define 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 33 define 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* %mem1, align 1 37 ; CHECK: [[ZEXT1:%[a-z]+]] = zext i8 [[LOAD1]] to i32 38 ; CHECK: [[LOAD2:%[a-z]+]] = load i8* %mem2, align 1 39 ; CHECK: [[ZEXT2:%[a-z]+]] = zext i8 [[LOAD2]] to i32 40 ; CHECK: [[RET:%[a-z]+]] = sub 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 47 define i32 @test_simplify4() { 48 ; CHECK-LABEL: @test_simplify4( 49 %mem1 = getelementptr [4 x i8]* @hel, i32 0, i32 0 50 %mem2 = getelementptr [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 56 define i32 @test_simplify5() { 57 ; CHECK-LABEL: @test_simplify5( 58 %mem1 = getelementptr [4 x i8]* @hel, i32 0, i32 0 59 %mem2 = getelementptr [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 65 define i32 @test_simplify6() { 66 ; CHECK-LABEL: @test_simplify6( 67 %mem1 = getelementptr [4 x i8]* @foo, i32 0, i32 0 68 %mem2 = getelementptr [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
