1 ; This test makes sure that div instructions are properly eliminated.
3 ; RUN: opt < %s -instcombine -S | FileCheck %s
5 define i32 @test1(i32 %A) {
6 %B = sdiv i32 %A, 1 ; <i32> [#uses=1]
9 ; CHECK-NEXT: ret i32 %A
12 define i32 @test2(i32 %A) {
14 %B = udiv i32 %A, 8 ; <i32> [#uses=1]
16 ; CHECK-LABEL: @test2(
17 ; CHECK-NEXT: lshr i32 %A, 3
20 define i32 @test3(i32 %A) {
21 ; => 0, don't need to keep traps
22 %B = sdiv i32 0, %A ; <i32> [#uses=1]
24 ; CHECK-LABEL: @test3(
25 ; CHECK-NEXT: ret i32 0
28 define i32 @test4(i32 %A) {
30 %B = sdiv i32 %A, -1 ; <i32> [#uses=1]
32 ; CHECK-LABEL: @test4(
33 ; CHECK-NEXT: sub i32 0, %A
36 define i32 @test5(i32 %A) {
37 %B = udiv i32 %A, -16 ; <i32> [#uses=1]
38 %C = udiv i32 %B, -4 ; <i32> [#uses=1]
40 ; CHECK-LABEL: @test5(
41 ; CHECK-NEXT: ret i32 0
44 define i1 @test6(i32 %A) {
45 %B = udiv i32 %A, 123 ; <i32> [#uses=1]
47 %C = icmp eq i32 %B, 0 ; <i1> [#uses=1]
49 ; CHECK-LABEL: @test6(
50 ; CHECK-NEXT: icmp ult i32 %A, 123
53 define i1 @test7(i32 %A) {
54 %B = udiv i32 %A, 10 ; <i32> [#uses=1]
56 %C = icmp eq i32 %B, 2 ; <i1> [#uses=1]
58 ; CHECK-LABEL: @test7(
59 ; CHECK-NEXT: add i32 %A, -20
60 ; CHECK-NEXT: icmp ult i32
63 define i1 @test8(i8 %A) {
64 %B = udiv i8 %A, 123 ; <i8> [#uses=1]
66 %C = icmp eq i8 %B, 2 ; <i1> [#uses=1]
68 ; CHECK-LABEL: @test8(
69 ; CHECK-NEXT: icmp ugt i8 %A, -11
72 define i1 @test9(i8 %A) {
73 %B = udiv i8 %A, 123 ; <i8> [#uses=1]
75 %C = icmp ne i8 %B, 2 ; <i1> [#uses=1]
77 ; CHECK-LABEL: @test9(
78 ; CHECK-NEXT: icmp ult i8 %A, -10
81 define i32 @test10(i32 %X, i1 %C) {
82 %V = select i1 %C, i32 64, i32 8 ; <i32> [#uses=1]
83 %R = udiv i32 %X, %V ; <i32> [#uses=1]
85 ; CHECK-LABEL: @test10(
86 ; CHECK-NEXT: select i1 %C, i32 6, i32 3
87 ; CHECK-NEXT: lshr i32 %X
90 define i32 @test11(i32 %X, i1 %C) {
91 %A = select i1 %C, i32 1024, i32 32 ; <i32> [#uses=1]
92 %B = udiv i32 %X, %A ; <i32> [#uses=1]
94 ; CHECK-LABEL: @test11(
95 ; CHECK-NEXT: select i1 %C, i32 10, i32 5
96 ; CHECK-NEXT: lshr i32 %X
100 define i32 @test12(i32 %x) nounwind {
101 %tmp3 = udiv i32 %x, %x ; 1
103 ; CHECK-LABEL: @test12(
104 ; CHECK-NEXT: ret i32 1
107 define i32 @test13(i32 %x) nounwind {
108 %tmp3 = sdiv i32 %x, %x ; 1
110 ; CHECK-LABEL: @test13(
111 ; CHECK-NEXT: ret i32 1
114 define i32 @test14(i8 %x) nounwind {
115 %zext = zext i8 %x to i32
116 %div = udiv i32 %zext, 257 ; 0
118 ; CHECK-LABEL: @test14(
119 ; CHECK-NEXT: ret i32 0
123 define i32 @test15(i32 %a, i32 %b) nounwind {
125 %div = lshr i32 %shl, 2
126 %div2 = udiv i32 %a, %div
128 ; CHECK-LABEL: @test15(
129 ; CHECK-NEXT: add i32 %b, -2
130 ; CHECK-NEXT: lshr i32 %a,
131 ; CHECK-NEXT: ret i32
134 define <2 x i64> @test16(<2 x i64> %x) nounwind {
135 %shr = lshr <2 x i64> %x, <i64 3, i64 5>
136 %div = udiv <2 x i64> %shr, <i64 4, i64 6>
138 ; CHECK-LABEL: @test16(
139 ; CHECK-NEXT: udiv <2 x i64> %x, <i64 32, i64 192>
140 ; CHECK-NEXT: ret <2 x i64>
143 define <2 x i64> @test17(<2 x i64> %x) nounwind {
144 %neg = sub nsw <2 x i64> zeroinitializer, %x
145 %div = sdiv <2 x i64> %neg, <i64 3, i64 4>
147 ; CHECK-LABEL: @test17(
148 ; CHECK-NEXT: sdiv <2 x i64> %x, <i64 -3, i64 -4>
149 ; CHECK-NEXT: ret <2 x i64>
152 define <2 x i64> @test18(<2 x i64> %x) nounwind {
153 %div = sdiv <2 x i64> %x, <i64 -1, i64 -1>
155 ; CHECK-LABEL: @test18(
156 ; CHECK-NEXT: sub <2 x i64> zeroinitializer, %x
157 ; CHECK-NEXT: ret <2 x i64>
160 define i32 @test19(i32 %x) {
163 ; CHECK-LABEL: @test19(
164 ; CHECK-NEXT: icmp eq i32 %x, 1
165 ; CHECK-NEXT: zext i1 %{{.*}} to i32
169 define i32 @test20(i32 %x) {
172 ; CHECK-LABEL: @test20(
173 ; CHECK-NEXT: add i32 %x, 1
174 ; CHECK-NEXT: icmp ult i32 %{{.*}}, 3
175 ; CHECK-NEXT: select i1 %{{.*}}, i32 %x, i32 {{.*}}
176 ; CHECK-NEXT: ret i32
179 define i32 @test21(i32 %a) {
180 %shl = shl nsw i32 %a, 2
181 %div = sdiv i32 %shl, 12
183 ; CHECK-LABEL: @test21(
184 ; CHECK-NEXT: %div = sdiv i32 %a, 3
185 ; CHECK-NEXT: ret i32 %div
188 define i32 @test22(i32 %a) {
189 %mul = mul nsw i32 %a, 3
190 %div = sdiv i32 %mul, 12
192 ; CHECK-LABEL: @test22(
193 ; CHECK-NEXT: %div = sdiv i32 %a, 4
194 ; CHECK-NEXT: ret i32 %div
197 define i32 @test23(i32 %a) {
198 %shl = shl nuw i32 %a, 2
199 %div = udiv i32 %shl, 12
201 ; CHECK-LABEL: @test23(
202 ; CHECK-NEXT: %div = udiv i32 %a, 3
203 ; CHECK-NEXT: ret i32 %div
206 define i32 @test24(i32 %a) {
207 %mul = mul nuw i32 %a, 3
208 %div = udiv i32 %mul, 12
210 ; CHECK-LABEL: @test24(
211 ; CHECK-NEXT: %div = lshr i32 %a, 2
212 ; CHECK-NEXT: ret i32 %div
215 define i32 @test25(i32 %a) {
216 %shl = shl nsw i32 %a, 2
217 %div = sdiv i32 %shl, 2
219 ; CHECK-LABEL: @test25(
220 ; CHECK-NEXT: %div = shl nsw i32 %a, 1
221 ; CHECK-NEXT: ret i32 %div
224 define i32 @test26(i32 %a) {
225 %mul = mul nsw i32 %a, 12
226 %div = sdiv i32 %mul, 3
228 ; CHECK-LABEL: @test26(
229 ; CHECK-NEXT: %div = shl nsw i32 %a, 2
230 ; CHECK-NEXT: ret i32 %div
233 define i32 @test27(i32 %a) {
234 %shl = shl nuw i32 %a, 2
235 %div = udiv i32 %shl, 2
237 ; CHECK-LABEL: @test27(
238 ; CHECK-NEXT: %div = shl nuw i32 %a, 1
239 ; CHECK-NEXT: ret i32 %div
242 define i32 @test28(i32 %a) {
243 %mul = mul nuw i32 %a, 36
244 %div = udiv i32 %mul, 3
246 ; CHECK-LABEL: @test28(
247 ; CHECK-NEXT: %div = mul nuw i32 %a, 12
248 ; CHECK-NEXT: ret i32 %div