1 ; Test that the memcmp library call simplifier works correctly.
3 ; RUN: opt < %s -instcombine -S | FileCheck %s
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-n8:16:32:64"
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"
11 declare i32 @memcmp(i8*, i8*, i32)
13 ; Check memcmp(mem, mem, size) -> 0.
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)
22 ; Check memcmp(mem1, mem2, 0) -> 0.
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)
31 ;; Check memcmp(mem1, mem2, 1) -> *(unsigned char*)mem1 - *(unsigned char*)mem2.
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, 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]]
42 ; CHECK: ret i32 [[RET]]
45 ; Check memcmp(mem1, mem2, size) -> cnst, where all arguments are constants.
47 define 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)
56 define 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)
65 define 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)
74 ; Check memcmp(mem1, mem2, 8)==0 -> *(int64_t*)mem1 == *(int64_t*)mem2
76 define i1 @test_simplify7(i64 %x, i64 %y) {
77 ; CHECK-LABEL: @test_simplify7(
78 %x.addr = alloca i64, align 8
79 %y.addr = alloca i64, align 8
80 store i64 %x, i64* %x.addr, align 8
81 store i64 %y, i64* %y.addr, align 8
82 %xptr = bitcast i64* %x.addr to i8*
83 %yptr = bitcast i64* %y.addr to i8*
84 %call = call i32 @memcmp(i8* %xptr, i8* %yptr, i32 8)
85 %cmp = icmp eq i32 %call, 0
87 ; CHECK: %cmp = icmp eq i64 %x, %y
91 ; Check memcmp(mem1, mem2, 4)==0 -> *(int32_t*)mem1 == *(int32_t*)mem2
93 define i1 @test_simplify8(i32 %x, i32 %y) {
94 ; CHECK-LABEL: @test_simplify8(
95 %x.addr = alloca i32, align 4
96 %y.addr = alloca i32, align 4
97 store i32 %x, i32* %x.addr, align 4
98 store i32 %y, i32* %y.addr, align 4
99 %xptr = bitcast i32* %x.addr to i8*
100 %yptr = bitcast i32* %y.addr to i8*
101 %call = call i32 @memcmp(i8* %xptr, i8* %yptr, i32 4)
102 %cmp = icmp eq i32 %call, 0
104 ; CHECK: %cmp = icmp eq i32 %x, %y
108 ; Check memcmp(mem1, mem2, 2)==0 -> *(int16_t*)mem1 == *(int16_t*)mem2
110 define i1 @test_simplify9(i16 %x, i16 %y) {
111 ; CHECK-LABEL: @test_simplify9(
112 %x.addr = alloca i16, align 2
113 %y.addr = alloca i16, align 2
114 store i16 %x, i16* %x.addr, align 2
115 store i16 %y, i16* %y.addr, align 2
116 %xptr = bitcast i16* %x.addr to i8*
117 %yptr = bitcast i16* %y.addr to i8*
118 %call = call i32 @memcmp(i8* %xptr, i8* %yptr, i32 2)
119 %cmp = icmp eq i32 %call, 0
121 ; CHECK: %cmp = icmp eq i16 %x, %y