1; NOTE: Assertions have been autogenerated by utils/update_test_checks.py 2; Test that the bcmp library call simplifier works correctly. 3; 4; RUN: opt < %s -instcombine -mtriple=x86_64-unknown-linux-gnu -S | FileCheck %s 5 6target 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-n8:16:32:64" 7 8@foo = constant [4 x i8] c"foo\00" 9@hel = constant [4 x i8] c"hel\00" 10@hello_u = constant [8 x i8] c"hello_u\00" 11 12declare i32 @bcmp(i8*, i8*, i32) 13 14; Check bcmp(mem, mem, size) -> 0. 15 16define i32 @test_simplify1(i8* %mem, i32 %size) { 17; CHECK-LABEL: @test_simplify1( 18; CHECK-NEXT: ret i32 0 19; 20 %ret = call i32 @bcmp(i8* %mem, i8* %mem, i32 %size) 21 ret i32 %ret 22} 23 24; Check bcmp(mem1, mem2, 0) -> 0. 25 26define i32 @test_simplify2(i8* %mem1, i8* %mem2) { 27; CHECK-LABEL: @test_simplify2( 28; CHECK-NEXT: ret i32 0 29; 30 %ret = call i32 @bcmp(i8* %mem1, i8* %mem2, i32 0) 31 ret i32 %ret 32} 33 34;; Check bcmp(mem1, mem2, 1) -> *(unsigned char*)mem1 - *(unsigned char*)mem2. 35 36define i32 @test_simplify3(i8* %mem1, i8* %mem2) { 37; CHECK-LABEL: @test_simplify3( 38; CHECK-NEXT: [[LHSC:%.*]] = load i8, i8* [[MEM1:%.*]], align 1 39; CHECK-NEXT: [[LHSV:%.*]] = zext i8 [[LHSC]] to i32 40; CHECK-NEXT: [[RHSC:%.*]] = load i8, i8* [[MEM2:%.*]], align 1 41; CHECK-NEXT: [[RHSV:%.*]] = zext i8 [[RHSC]] to i32 42; CHECK-NEXT: [[CHARDIFF:%.*]] = sub nsw i32 [[LHSV]], [[RHSV]] 43; CHECK-NEXT: ret i32 [[CHARDIFF]] 44; 45 %ret = call i32 @bcmp(i8* %mem1, i8* %mem2, i32 1) 46 ret i32 %ret 47} 48 49; Check bcmp(mem1, mem2, size) -> cnst, where all arguments are constants. 50 51define i32 @test_simplify4() { 52; CHECK-LABEL: @test_simplify4( 53; CHECK-NEXT: ret i32 0 54; 55 %mem1 = getelementptr [4 x i8], [4 x i8]* @hel, i32 0, i32 0 56 %mem2 = getelementptr [8 x i8], [8 x i8]* @hello_u, i32 0, i32 0 57 %ret = call i32 @bcmp(i8* %mem1, i8* %mem2, i32 3) 58 ret i32 %ret 59} 60 61define i32 @test_simplify5() { 62; CHECK-LABEL: @test_simplify5( 63; CHECK-NEXT: ret i32 1 64; 65 %mem1 = getelementptr [4 x i8], [4 x i8]* @hel, i32 0, i32 0 66 %mem2 = getelementptr [4 x i8], [4 x i8]* @foo, i32 0, i32 0 67 %ret = call i32 @bcmp(i8* %mem1, i8* %mem2, i32 3) 68 ret i32 %ret 69} 70 71define i32 @test_simplify6() { 72; CHECK-LABEL: @test_simplify6( 73; CHECK-NEXT: ret i32 -1 74; 75 %mem1 = getelementptr [4 x i8], [4 x i8]* @foo, i32 0, i32 0 76 %mem2 = getelementptr [4 x i8], [4 x i8]* @hel, i32 0, i32 0 77 %ret = call i32 @bcmp(i8* %mem1, i8* %mem2, i32 3) 78 ret i32 %ret 79} 80 81; Check bcmp(mem1, mem2, 8)==0 -> *(int64_t*)mem1 == *(int64_t*)mem2 82 83define i1 @test_simplify7(i64 %x, i64 %y) { 84; CHECK-LABEL: @test_simplify7( 85; CHECK-NEXT: [[TMP1:%.*]] = icmp eq i64 [[X:%.*]], [[Y:%.*]] 86; CHECK-NEXT: ret i1 [[TMP1]] 87; 88 %x.addr = alloca i64, align 8 89 %y.addr = alloca i64, align 8 90 store i64 %x, i64* %x.addr, align 8 91 store i64 %y, i64* %y.addr, align 8 92 %xptr = bitcast i64* %x.addr to i8* 93 %yptr = bitcast i64* %y.addr to i8* 94 %call = call i32 @bcmp(i8* %xptr, i8* %yptr, i32 8) 95 %cmp = icmp eq i32 %call, 0 96 ret i1 %cmp 97} 98 99; Check bcmp(mem1, mem2, 4)==0 -> *(int32_t*)mem1 == *(int32_t*)mem2 100 101define i1 @test_simplify8(i32 %x, i32 %y) { 102; CHECK-LABEL: @test_simplify8( 103; CHECK-NEXT: [[TMP1:%.*]] = icmp eq i32 [[X:%.*]], [[Y:%.*]] 104; CHECK-NEXT: ret i1 [[TMP1]] 105; 106 %x.addr = alloca i32, align 4 107 %y.addr = alloca i32, align 4 108 store i32 %x, i32* %x.addr, align 4 109 store i32 %y, i32* %y.addr, align 4 110 %xptr = bitcast i32* %x.addr to i8* 111 %yptr = bitcast i32* %y.addr to i8* 112 %call = call i32 @bcmp(i8* %xptr, i8* %yptr, i32 4) 113 %cmp = icmp eq i32 %call, 0 114 ret i1 %cmp 115} 116 117; Check bcmp(mem1, mem2, 2)==0 -> *(int16_t*)mem1 == *(int16_t*)mem2 118 119define i1 @test_simplify9(i16 %x, i16 %y) { 120; CHECK-LABEL: @test_simplify9( 121; CHECK-NEXT: [[TMP1:%.*]] = icmp eq i16 [[X:%.*]], [[Y:%.*]] 122; CHECK-NEXT: ret i1 [[TMP1]] 123; 124 %x.addr = alloca i16, align 2 125 %y.addr = alloca i16, align 2 126 store i16 %x, i16* %x.addr, align 2 127 store i16 %y, i16* %y.addr, align 2 128 %xptr = bitcast i16* %x.addr to i8* 129 %yptr = bitcast i16* %y.addr to i8* 130 %call = call i32 @bcmp(i8* %xptr, i8* %yptr, i32 2) 131 %cmp = icmp eq i32 %call, 0 132 ret i1 %cmp 133} 134 135define i1 @test_simplify10(i8* %mem1, i8* %mem2, i32 %size) { 136; CHECK-LABEL: @test_simplify10( 137; CHECK-NEXT: [[CALL:%.*]] = call i32 @bcmp(i8* [[MEM1:%.*]], i8* [[MEM2:%.*]], i32 [[SIZE:%.*]]) 138; CHECK-NEXT: [[CMP:%.*]] = icmp eq i32 [[CALL]], 0 139; CHECK-NEXT: ret i1 [[CMP]] 140; 141 %call = call i32 @bcmp(i8* %mem1, i8* %mem2, i32 %size) 142 %cmp = icmp eq i32 %call, 0 143 ret i1 %cmp 144} 145