xref: /llvm-project/llvm/test/Transforms/InstCombine/sadd-with-overflow.ll (revision 7f15dd097e7d6ffc33a1ec15f1efeeaed19df676) 
1; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
2; RUN: opt < %s -instcombine -S | FileCheck %s
3
4declare { <2 x i32>, <2 x i1> } @llvm.sadd.with.overflow.v2i32(<2 x i32>, <2 x i32>)
5
6declare { i32, i1 } @llvm.sadd.with.overflow.i32(i32, i32)
7
8declare { i8, i1 } @llvm.sadd.with.overflow.i8(i8, i8)
9
10define { i32, i1 } @simple_fold(i32 %x) {
11; CHECK-LABEL: @simple_fold(
12; CHECK-NEXT:    [[TMP1:%.*]] = call { i32, i1 } @llvm.sadd.with.overflow.i32(i32 [[X:%.*]], i32 20)
13; CHECK-NEXT:    ret { i32, i1 } [[TMP1]]
14;
15  %a = add nsw i32 %x, 7
16  %b = tail call { i32, i1 } @llvm.sadd.with.overflow.i32(i32 %a, i32 13)
17  ret { i32, i1 } %b
18}
19
20define { i32, i1 } @fold_mixed_signs(i32 %x) {
21; CHECK-LABEL: @fold_mixed_signs(
22; CHECK-NEXT:    [[TMP1:%.*]] = call { i32, i1 } @llvm.sadd.with.overflow.i32(i32 [[X:%.*]], i32 6)
23; CHECK-NEXT:    ret { i32, i1 } [[TMP1]]
24;
25  %a = add nsw i32 %x, 13
26  %b = tail call { i32, i1 } @llvm.sadd.with.overflow.i32(i32 %a, i32 -7)
27  ret { i32, i1 } %b
28}
29
30define { i8, i1 } @fold_on_constant_add_no_overflow(i8 %x) {
31; CHECK-LABEL: @fold_on_constant_add_no_overflow(
32; CHECK-NEXT:    [[TMP1:%.*]] = call { i8, i1 } @llvm.sadd.with.overflow.i8(i8 [[X:%.*]], i8 127)
33; CHECK-NEXT:    ret { i8, i1 } [[TMP1]]
34;
35  %a = add nsw i8 %x, 100
36  %b = tail call { i8, i1 } @llvm.sadd.with.overflow.i8(i8 %a, i8 27)
37  ret { i8, i1 } %b
38}
39
40define { i8, i1 } @no_fold_on_constant_add_overflow(i8 %x) {
41; CHECK-LABEL: @no_fold_on_constant_add_overflow(
42; CHECK-NEXT:    [[A:%.*]] = add nsw i8 [[X:%.*]], 100
43; CHECK-NEXT:    [[B:%.*]] = tail call { i8, i1 } @llvm.sadd.with.overflow.i8(i8 [[A]], i8 28)
44; CHECK-NEXT:    ret { i8, i1 } [[B]]
45;
46  %a = add nsw i8 %x, 100
47  %b = tail call { i8, i1 } @llvm.sadd.with.overflow.i8(i8 %a, i8 28)
48  ret { i8, i1 } %b
49}
50
51define { <2 x i32>, <2 x i1> } @fold_simple_splat_constant(<2 x i32> %x) {
52; CHECK-LABEL: @fold_simple_splat_constant(
53; CHECK-NEXT:    [[TMP1:%.*]] = call { <2 x i32>, <2 x i1> } @llvm.sadd.with.overflow.v2i32(<2 x i32> [[X:%.*]], <2 x i32> <i32 42, i32 42>)
54; CHECK-NEXT:    ret { <2 x i32>, <2 x i1> } [[TMP1]]
55;
56  %a = add nsw <2 x i32> %x, <i32 12, i32 12>
57  %b = tail call { <2 x i32>, <2 x i1> } @llvm.sadd.with.overflow.v2i32(<2 x i32> %a, <2 x i32> <i32 30, i32 30>)
58  ret { <2 x i32>, <2 x i1> } %b
59}
60
61define { <2 x i32>, <2 x i1> } @no_fold_splat_undef_constant(<2 x i32> %x) {
62; CHECK-LABEL: @no_fold_splat_undef_constant(
63; CHECK-NEXT:    [[A:%.*]] = add nsw <2 x i32> [[X:%.*]], <i32 12, i32 undef>
64; CHECK-NEXT:    [[B:%.*]] = tail call { <2 x i32>, <2 x i1> } @llvm.sadd.with.overflow.v2i32(<2 x i32> [[A]], <2 x i32> <i32 30, i32 30>)
65; CHECK-NEXT:    ret { <2 x i32>, <2 x i1> } [[B]]
66;
67  %a = add nsw <2 x i32> %x, <i32 12, i32 undef>
68  %b = tail call { <2 x i32>, <2 x i1> } @llvm.sadd.with.overflow.v2i32(<2 x i32> %a, <2 x i32> <i32 30, i32 30>)
69  ret { <2 x i32>, <2 x i1> } %b
70}
71
72define { <2 x i32>, <2 x i1> } @no_fold_splat_not_constant(<2 x i32> %x, <2 x i32> %y) {
73; CHECK-LABEL: @no_fold_splat_not_constant(
74; CHECK-NEXT:    [[A:%.*]] = add nsw <2 x i32> [[X:%.*]], [[Y:%.*]]
75; CHECK-NEXT:    [[B:%.*]] = tail call { <2 x i32>, <2 x i1> } @llvm.sadd.with.overflow.v2i32(<2 x i32> [[A]], <2 x i32> <i32 30, i32 30>)
76; CHECK-NEXT:    ret { <2 x i32>, <2 x i1> } [[B]]
77;
78  %a = add nsw <2 x i32> %x, %y
79  %b = tail call { <2 x i32>, <2 x i1> } @llvm.sadd.with.overflow.v2i32(<2 x i32> %a, <2 x i32> <i32 30, i32 30>)
80  ret { <2 x i32>, <2 x i1> } %b
81}
82
83define { i32, i1 } @fold_nuwnsw(i32 %x) {
84; CHECK-LABEL: @fold_nuwnsw(
85; CHECK-NEXT:    [[TMP1:%.*]] = call { i32, i1 } @llvm.sadd.with.overflow.i32(i32 [[X:%.*]], i32 42)
86; CHECK-NEXT:    ret { i32, i1 } [[TMP1]]
87;
88  %a = add nuw nsw i32 %x, 12
89  %b = tail call { i32, i1 } @llvm.sadd.with.overflow.i32(i32 %a, i32 30)
90  ret { i32, i1 } %b
91}
92
93define { i32, i1 } @no_fold_nuw(i32 %x) {
94; CHECK-LABEL: @no_fold_nuw(
95; CHECK-NEXT:    [[A:%.*]] = add nuw i32 [[X:%.*]], 12
96; CHECK-NEXT:    [[B:%.*]] = tail call { i32, i1 } @llvm.sadd.with.overflow.i32(i32 [[A]], i32 30)
97; CHECK-NEXT:    ret { i32, i1 } [[B]]
98;
99  %a = add nuw i32 %x, 12
100  %b = tail call { i32, i1 } @llvm.sadd.with.overflow.i32(i32 %a, i32 30)
101  ret { i32, i1 } %b
102}
103
104define { i32, i1 } @no_fold_wrapped_add(i32 %x) {
105; CHECK-LABEL: @no_fold_wrapped_add(
106; CHECK-NEXT:    [[A:%.*]] = add i32 [[X:%.*]], 12
107; CHECK-NEXT:    [[B:%.*]] = tail call { i32, i1 } @llvm.sadd.with.overflow.i32(i32 [[A]], i32 30)
108; CHECK-NEXT:    ret { i32, i1 } [[B]]
109;
110  %a = add i32 %x, 12
111  %b = tail call { i32, i1 } @llvm.sadd.with.overflow.i32(i32 30, i32 %a)
112  ret { i32, i1 } %b
113}
114
115define { i32, i1 } @fold_sub_simple(i32 %x) {
116; CHECK-LABEL: @fold_sub_simple(
117; CHECK-NEXT:    [[TMP1:%.*]] = call { i32, i1 } @llvm.sadd.with.overflow.i32(i32 [[X:%.*]], i32 42)
118; CHECK-NEXT:    ret { i32, i1 } [[TMP1]]
119;
120  %a = sub nsw i32 %x, -12
121  %b = tail call { i32, i1 } @llvm.sadd.with.overflow.i32(i32 %a, i32 30)
122  ret { i32, i1 } %b
123}
124