1; RUN: opt < %s -instsimplify -S | FileCheck %s
2
3declare {i8, i1} @llvm.uadd.with.overflow.i8(i8 %a, i8 %b)
4
5define i1 @test_uadd1() {
6; CHECK-LABEL: @test_uadd1(
7  %x = call {i8, i1} @llvm.uadd.with.overflow.i8(i8 254, i8 3)
8  %overflow = extractvalue {i8, i1} %x, 1
9  ret i1 %overflow
10; CHECK-NEXT: ret i1 true
11}
12
13define i8 @test_uadd2() {
14; CHECK-LABEL: @test_uadd2(
15  %x = call {i8, i1} @llvm.uadd.with.overflow.i8(i8 254, i8 44)
16  %result = extractvalue {i8, i1} %x, 0
17  ret i8 %result
18; CHECK-NEXT: ret i8 42
19}
20
21declare i256 @llvm.cttz.i256(i256 %src, i1 %is_zero_undef)
22
23define i256 @test_cttz() {
24; CHECK-LABEL: @test_cttz(
25  %x = call i256 @llvm.cttz.i256(i256 10, i1 false)
26  ret i256 %x
27; CHECK-NEXT: ret i256 1
28}
29
30declare i256 @llvm.ctpop.i256(i256 %src)
31
32define i256 @test_ctpop() {
33; CHECK-LABEL: @test_ctpop(
34  %x = call i256 @llvm.ctpop.i256(i256 10)
35  ret i256 %x
36; CHECK-NEXT: ret i256 2
37}
38
39; Test a non-intrinsic that we know about as a library call.
40declare float @fabs(float %x)
41
42define float @test_fabs_libcall() {
43; CHECK-LABEL: @test_fabs_libcall(
44
45  %x = call float @fabs(float -42.0)
46; This is still a real function call, so instsimplify won't nuke it -- other
47; passes have to do that.
48; CHECK-NEXT: call float @fabs
49
50  ret float %x
51; CHECK-NEXT: ret float 4.2{{0+}}e+01
52}
53
54
55declare float @llvm.fabs.f32(float) nounwind readnone
56declare float @llvm.floor.f32(float) nounwind readnone
57declare float @llvm.ceil.f32(float) nounwind readnone
58declare float @llvm.trunc.f32(float) nounwind readnone
59declare float @llvm.rint.f32(float) nounwind readnone
60declare float @llvm.nearbyint.f32(float) nounwind readnone
61
62; Test idempotent intrinsics
63define float @test_idempotence(float %a) {
64; CHECK-LABEL: @test_idempotence(
65
66; CHECK: fabs
67; CHECK-NOT: fabs
68  %a0 = call float @llvm.fabs.f32(float %a)
69  %a1 = call float @llvm.fabs.f32(float %a0)
70
71; CHECK: floor
72; CHECK-NOT: floor
73  %b0 = call float @llvm.floor.f32(float %a)
74  %b1 = call float @llvm.floor.f32(float %b0)
75
76; CHECK: ceil
77; CHECK-NOT: ceil
78  %c0 = call float @llvm.ceil.f32(float %a)
79  %c1 = call float @llvm.ceil.f32(float %c0)
80
81; CHECK: trunc
82; CHECK-NOT: trunc
83  %d0 = call float @llvm.trunc.f32(float %a)
84  %d1 = call float @llvm.trunc.f32(float %d0)
85
86; CHECK: rint
87; CHECK-NOT: rint
88  %e0 = call float @llvm.rint.f32(float %a)
89  %e1 = call float @llvm.rint.f32(float %e0)
90
91; CHECK: nearbyint
92; CHECK-NOT: nearbyint
93  %f0 = call float @llvm.nearbyint.f32(float %a)
94  %f1 = call float @llvm.nearbyint.f32(float %f0)
95
96  %r0 = fadd float %a1, %b1
97  %r1 = fadd float %r0, %c1
98  %r2 = fadd float %r1, %d1
99  %r3 = fadd float %r2, %e1
100  %r4 = fadd float %r3, %f1
101
102  ret float %r4
103}
104
105define i8* @operator_new() {
106entry:
107  %call = tail call noalias i8* @_Znwm(i64 8)
108  %cmp = icmp eq i8* %call, null
109  br i1 %cmp, label %cast.end, label %cast.notnull
110
111cast.notnull:                                     ; preds = %entry
112  %add.ptr = getelementptr inbounds i8, i8* %call, i64 4
113  br label %cast.end
114
115cast.end:                                         ; preds = %cast.notnull, %entry
116  %cast.result = phi i8* [ %add.ptr, %cast.notnull ], [ null, %entry ]
117  ret i8* %cast.result
118
119; CHECK-LABEL: @operator_new
120; CHECK: br i1 false, label %cast.end, label %cast.notnull
121}
122
123declare noalias i8* @_Znwm(i64)
124
125%"struct.std::nothrow_t" = type { i8 }
126@_ZSt7nothrow = external global %"struct.std::nothrow_t"
127
128define i8* @operator_new_nothrow_t() {
129entry:
130  %call = tail call noalias i8* @_ZnamRKSt9nothrow_t(i64 8, %"struct.std::nothrow_t"* @_ZSt7nothrow)
131  %cmp = icmp eq i8* %call, null
132  br i1 %cmp, label %cast.end, label %cast.notnull
133
134cast.notnull:                                     ; preds = %entry
135  %add.ptr = getelementptr inbounds i8, i8* %call, i64 4
136  br label %cast.end
137
138cast.end:                                         ; preds = %cast.notnull, %entry
139  %cast.result = phi i8* [ %add.ptr, %cast.notnull ], [ null, %entry ]
140  ret i8* %cast.result
141
142; CHECK-LABEL: @operator_new_nothrow_t
143; CHECK: br i1 %cmp, label %cast.end, label %cast.notnull
144}
145
146declare i8* @_ZnamRKSt9nothrow_t(i64, %"struct.std::nothrow_t"*) nounwind
147
148define i8* @malloc_can_return_null() {
149entry:
150  %call = tail call noalias i8* @malloc(i64 8)
151  %cmp = icmp eq i8* %call, null
152  br i1 %cmp, label %cast.end, label %cast.notnull
153
154cast.notnull:                                     ; preds = %entry
155  %add.ptr = getelementptr inbounds i8, i8* %call, i64 4
156  br label %cast.end
157
158cast.end:                                         ; preds = %cast.notnull, %entry
159  %cast.result = phi i8* [ %add.ptr, %cast.notnull ], [ null, %entry ]
160  ret i8* %cast.result
161
162; CHECK-LABEL: @malloc_can_return_null
163; CHECK: br i1 %cmp, label %cast.end, label %cast.notnull
164}
165
166declare noalias i8* @malloc(i64)
167