1; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
2; RUN: opt < %s -instcombine -S | FileCheck %s
3
4declare void @use(i32)
5declare i32 @llvm.abs.i32(i32, i1)
6declare <4 x i32> @llvm.abs.v4i32(<4 x i32>, i1)
7
8define i32 @test_sdiv_canonicalize_op0(i32 %x, i32 %y) {
9; CHECK-LABEL: @test_sdiv_canonicalize_op0(
10; CHECK-NEXT:    [[SDIV1:%.*]] = sdiv i32 [[X:%.*]], [[Y:%.*]]
11; CHECK-NEXT:    [[SDIV:%.*]] = sub nsw i32 0, [[SDIV1]]
12; CHECK-NEXT:    ret i32 [[SDIV]]
13;
14  %neg = sub nsw i32 0, %x
15  %sdiv = sdiv i32 %neg, %y
16  ret i32 %sdiv
17}
18
19define i32 @test_sdiv_canonicalize_op0_exact(i32 %x, i32 %y) {
20; CHECK-LABEL: @test_sdiv_canonicalize_op0_exact(
21; CHECK-NEXT:    [[SDIV1:%.*]] = sdiv exact i32 [[X:%.*]], [[Y:%.*]]
22; CHECK-NEXT:    [[SDIV:%.*]] = sub nsw i32 0, [[SDIV1]]
23; CHECK-NEXT:    ret i32 [[SDIV]]
24;
25  %neg = sub nsw i32 0, %x
26  %sdiv = sdiv exact i32 %neg, %y
27  ret i32 %sdiv
28}
29
30; (X/-Y) is not equal to -(X/Y), don't canonicalize.
31define i32 @test_sdiv_canonicalize_op1(i32 %x, i32 %z) {
32; CHECK-LABEL: @test_sdiv_canonicalize_op1(
33; CHECK-NEXT:    [[Y:%.*]] = mul i32 [[Z:%.*]], 3
34; CHECK-NEXT:    [[NEG:%.*]] = sub nsw i32 0, [[X:%.*]]
35; CHECK-NEXT:    [[SDIV:%.*]] = sdiv i32 [[Y]], [[NEG]]
36; CHECK-NEXT:    ret i32 [[SDIV]]
37;
38  %y = mul i32 %z, 3
39  %neg = sub nsw i32 0, %x
40  %sdiv = sdiv i32 %y, %neg
41  ret i32 %sdiv
42}
43
44define i32 @test_sdiv_canonicalize_nonsw(i32 %x, i32 %y) {
45; CHECK-LABEL: @test_sdiv_canonicalize_nonsw(
46; CHECK-NEXT:    [[NEG:%.*]] = sub i32 0, [[X:%.*]]
47; CHECK-NEXT:    [[SDIV:%.*]] = sdiv i32 [[NEG]], [[Y:%.*]]
48; CHECK-NEXT:    ret i32 [[SDIV]]
49;
50  %neg = sub i32 0, %x
51  %sdiv = sdiv i32 %neg, %y
52  ret i32 %sdiv
53}
54
55define <2 x i32> @test_sdiv_canonicalize_vec(<2 x i32> %x, <2 x i32> %y) {
56; CHECK-LABEL: @test_sdiv_canonicalize_vec(
57; CHECK-NEXT:    [[SDIV1:%.*]] = sdiv <2 x i32> [[X:%.*]], [[Y:%.*]]
58; CHECK-NEXT:    [[SDIV:%.*]] = sub nsw <2 x i32> zeroinitializer, [[SDIV1]]
59; CHECK-NEXT:    ret <2 x i32> [[SDIV]]
60;
61  %neg = sub nsw <2 x i32> <i32 0, i32 0>, %x
62  %sdiv = sdiv <2 x i32> %neg, %y
63  ret <2 x i32> %sdiv
64}
65
66define i32 @test_sdiv_canonicalize_multiple_uses(i32 %x, i32 %y) {
67; CHECK-LABEL: @test_sdiv_canonicalize_multiple_uses(
68; CHECK-NEXT:    [[NEG:%.*]] = sub nsw i32 0, [[X:%.*]]
69; CHECK-NEXT:    [[SDIV:%.*]] = sdiv i32 [[NEG]], [[Y:%.*]]
70; CHECK-NEXT:    [[SDIV2:%.*]] = sdiv i32 [[SDIV]], [[NEG]]
71; CHECK-NEXT:    ret i32 [[SDIV2]]
72;
73  %neg = sub nsw i32 0, %x
74  %sdiv = sdiv i32 %neg, %y
75  %sdiv2 = sdiv i32 %sdiv, %neg
76  ret i32 %sdiv2
77}
78
79; There is combination: -(X/CE) -> (X/-CE).
80; If combines (X/-CE) to -(X/CE), make sure don't combine them endless.
81
82@X = global i32 5
83
84define i64 @test_sdiv_canonicalize_constexpr(i64 %L1) {
85; currently opt folds (sub nsw i64 0, constexpr) -> (sub i64, 0, constexpr).
86; sdiv canonicalize requires a nsw sub.
87; CHECK-LABEL: @test_sdiv_canonicalize_constexpr(
88; CHECK-NEXT:    [[B4:%.*]] = sdiv i64 [[L1:%.*]], sub (i64 0, i64 ptrtoint (i32* @X to i64))
89; CHECK-NEXT:    ret i64 [[B4]]
90;
91  %v1 = ptrtoint i32* @X to i64
92  %B8 = sub nsw i64 0, %v1
93  %B4 = sdiv i64 %L1, %B8
94  ret i64 %B4
95}
96
97define i32 @sdiv_abs_nsw(i32 %x) {
98; CHECK-LABEL: @sdiv_abs_nsw(
99; CHECK-NEXT:    [[DOTINV:%.*]] = icmp sgt i32 [[X:%.*]], -1
100; CHECK-NEXT:    [[R:%.*]] = select i1 [[DOTINV]], i32 1, i32 -1
101; CHECK-NEXT:    ret i32 [[R]]
102;
103  %a = call i32 @llvm.abs.i32(i32 %x, i1 true)
104  %r = sdiv i32 %a, %x
105  ret i32 %r
106}
107
108define <4 x i32> @sdiv_abs_nsw_vec(<4 x i32> %x) {
109; CHECK-LABEL: @sdiv_abs_nsw_vec(
110; CHECK-NEXT:    [[DOTINV:%.*]] = icmp sgt <4 x i32> [[X:%.*]], <i32 -1, i32 -1, i32 -1, i32 -1>
111; CHECK-NEXT:    [[R:%.*]] = select <4 x i1> [[DOTINV]], <4 x i32> <i32 1, i32 1, i32 1, i32 1>, <4 x i32> <i32 -1, i32 -1, i32 -1, i32 -1>
112; CHECK-NEXT:    ret <4 x i32> [[R]]
113;
114  %a = call <4 x i32> @llvm.abs.v4i32(<4 x i32> %x, i1 true)
115  %r = sdiv <4 x i32> %x, %a
116  ret <4 x i32> %r
117}
118
119; Negative test - requires poison int min (nsw)
120
121define i32 @sdiv_abs(i32 %x) {
122; CHECK-LABEL: @sdiv_abs(
123; CHECK-NEXT:    [[A:%.*]] = call i32 @llvm.abs.i32(i32 [[X:%.*]], i1 false)
124; CHECK-NEXT:    [[R:%.*]] = sdiv i32 [[A]], [[X]]
125; CHECK-NEXT:    ret i32 [[R]]
126;
127  %a = call i32 @llvm.abs.i32(i32 %x, i1 false)
128  %r = sdiv i32 %a, %x
129  ret i32 %r
130}
131
132; Negative test
133
134define i32 @sdiv_abs_extra_use(i32 %x) {
135; CHECK-LABEL: @sdiv_abs_extra_use(
136; CHECK-NEXT:    [[A:%.*]] = call i32 @llvm.abs.i32(i32 [[X:%.*]], i1 true)
137; CHECK-NEXT:    call void @use(i32 [[A]])
138; CHECK-NEXT:    [[R:%.*]] = sdiv i32 [[A]], [[X]]
139; CHECK-NEXT:    ret i32 [[R]]
140;
141  %a = call i32 @llvm.abs.i32(i32 %x, i1 true)
142  call void @use(i32 %a)
143  %r = sdiv i32 %a, %x
144  ret i32 %r
145}
146