1 ; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
2 ; Test that the bcmp library call simplifier works correctly.
4 ; RUN: opt < %s -passes=instcombine -mtriple=x86_64-unknown-linux-gnu -S | FileCheck %s
6 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"
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"
12 declare i32 @bcmp(ptr, ptr, i32)
14 ; Check bcmp(mem, mem, size) -> 0.
16 define i32 @test_simplify1(ptr %mem, i32 %size) {
17 ; CHECK-LABEL: @test_simplify1(
18 ; CHECK-NEXT: ret i32 0
20 %ret = call i32 @bcmp(ptr %mem, ptr %mem, i32 %size)
24 ; Check bcmp(mem1, mem2, 0) -> 0.
26 define i32 @test_simplify2(ptr %mem1, ptr %mem2) {
27 ; CHECK-LABEL: @test_simplify2(
28 ; CHECK-NEXT: ret i32 0
30 %ret = call i32 @bcmp(ptr %mem1, ptr %mem2, i32 0)
34 ;; Check bcmp(mem1, mem2, 1) -> *(unsigned char*)mem1 - *(unsigned char*)mem2.
36 define i32 @test_simplify3(ptr %mem1, ptr %mem2) {
37 ; CHECK-LABEL: @test_simplify3(
38 ; CHECK-NEXT: [[LHSC:%.*]] = load i8, ptr [[MEM1:%.*]], align 1
39 ; CHECK-NEXT: [[LHSV:%.*]] = zext i8 [[LHSC]] to i32
40 ; CHECK-NEXT: [[RHSC:%.*]] = load i8, ptr [[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]]
45 %ret = call i32 @bcmp(ptr %mem1, ptr %mem2, i32 1)
49 ; Check bcmp(mem1, mem2, size) -> cnst, where all arguments are constants.
51 define i32 @test_simplify4() {
52 ; CHECK-LABEL: @test_simplify4(
53 ; CHECK-NEXT: ret i32 0
55 %ret = call i32 @bcmp(ptr @hel, ptr @hello_u, i32 3)
59 define i32 @test_simplify5() {
60 ; CHECK-LABEL: @test_simplify5(
61 ; CHECK-NEXT: ret i32 1
63 %ret = call i32 @bcmp(ptr @hel, ptr @foo, i32 3)
67 define i32 @test_simplify6() {
68 ; CHECK-LABEL: @test_simplify6(
69 ; CHECK-NEXT: ret i32 -1
71 %ret = call i32 @bcmp(ptr @foo, ptr @hel, i32 3)
75 ; Check bcmp(mem1, mem2, 8)==0 -> *(int64_t*)mem1 == *(int64_t*)mem2
77 define i1 @test_simplify7(i64 %x, i64 %y) {
78 ; CHECK-LABEL: @test_simplify7(
79 ; CHECK-NEXT: [[DOTNOT:%.*]] = icmp eq i64 [[X:%.*]], [[Y:%.*]]
80 ; CHECK-NEXT: ret i1 [[DOTNOT]]
82 %x.addr = alloca i64, align 8
83 %y.addr = alloca i64, align 8
84 store i64 %x, ptr %x.addr, align 8
85 store i64 %y, ptr %y.addr, align 8
86 %call = call i32 @bcmp(ptr %x.addr, ptr %y.addr, i32 8)
87 %cmp = icmp eq i32 %call, 0
91 ; Check bcmp(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 ; CHECK-NEXT: [[DOTNOT:%.*]] = icmp eq i32 [[X:%.*]], [[Y:%.*]]
96 ; CHECK-NEXT: ret i1 [[DOTNOT]]
98 %x.addr = alloca i32, align 4
99 %y.addr = alloca i32, align 4
100 store i32 %x, ptr %x.addr, align 4
101 store i32 %y, ptr %y.addr, align 4
102 %call = call i32 @bcmp(ptr %x.addr, ptr %y.addr, i32 4)
103 %cmp = icmp eq i32 %call, 0
107 ; Check bcmp(mem1, mem2, 2)==0 -> *(int16_t*)mem1 == *(int16_t*)mem2
109 define i1 @test_simplify9(i16 %x, i16 %y) {
110 ; CHECK-LABEL: @test_simplify9(
111 ; CHECK-NEXT: [[DOTNOT:%.*]] = icmp eq i16 [[X:%.*]], [[Y:%.*]]
112 ; CHECK-NEXT: ret i1 [[DOTNOT]]
114 %x.addr = alloca i16, align 2
115 %y.addr = alloca i16, align 2
116 store i16 %x, ptr %x.addr, align 2
117 store i16 %y, ptr %y.addr, align 2
118 %call = call i32 @bcmp(ptr %x.addr, ptr %y.addr, i32 2)
119 %cmp = icmp eq i32 %call, 0
123 define i1 @test_simplify10(ptr %mem1, ptr %mem2, i32 %size) {
124 ; CHECK-LABEL: @test_simplify10(
125 ; CHECK-NEXT: [[CALL:%.*]] = call i32 @bcmp(ptr [[MEM1:%.*]], ptr [[MEM2:%.*]], i32 [[SIZE:%.*]])
126 ; CHECK-NEXT: [[CMP:%.*]] = icmp eq i32 [[CALL]], 0
127 ; CHECK-NEXT: ret i1 [[CMP]]
129 %call = call i32 @bcmp(ptr %mem1, ptr %mem2, i32 %size)
130 %cmp = icmp eq i32 %call, 0