1 ; RUN: opt < %s -instcombine -S | FileCheck %s
4 ; CHECK: sdiv i32 %x, 8
5 define i32 @sdiv1(i32 %x) {
11 ; CHECK: ashr exact i32 %x, 3
12 define i32 @sdiv2(i32 %x) {
13 %y = sdiv exact i32 %x, 8
18 ; CHECK: %y = srem i32 %x, 3
19 ; CHECK: %z = sub i32 %x, %y
21 define i32 @sdiv3(i32 %x) {
29 define i32 @sdiv4(i32 %x) {
30 %y = sdiv exact i32 %x, 3
36 ; CHECK: %y = srem i32 %x, 3
37 ; CHECK: %z = sub i32 %y, %x
39 define i32 @sdiv5(i32 %x) {
46 ; CHECK: %z = sub i32 0, %x
48 define i32 @sdiv6(i32 %x) {
49 %y = sdiv exact i32 %x, 3
56 define i32 @udiv1(i32 %x, i32 %w) {
57 %y = udiv exact i32 %x, %w
63 ; CHECK: %z = lshr exact i32 %x, %w
65 define i32 @udiv2(i32 %x, i32 %w) {
67 %z = udiv exact i32 %x, %y
72 ; CHECK: %B = ashr exact i64 %A, 2
74 define i64 @ashr1(i64 %X) nounwind {
76 %B = ashr i64 %A, 2 ; X/4
81 ; CHECK: %B = icmp eq i64 %X, 0
83 define i1 @ashr_icmp1(i64 %X) nounwind {
84 %A = ashr exact i64 %X, 2 ; X/4
85 %B = icmp eq i64 %A, 0
90 ; CHECK: %Z = icmp slt i64 %X, 16
92 define i1 @ashr_icmp2(i64 %X) nounwind {
93 %Y = ashr exact i64 %X, 2 ; x / 4
94 %Z = icmp slt i64 %Y, 4 ; x < 16
99 ; CHECK: icmp ne i64 %X, 0
100 define i1 @udiv_icmp1(i64 %X) nounwind {
101 %A = udiv exact i64 %X, 5 ; X/5
102 %B = icmp ne i64 %A, 0
107 ; CHECK: icmp eq i64 %X, 0
108 define i1 @sdiv_icmp1(i64 %X) nounwind {
109 %A = sdiv exact i64 %X, 5 ; X/5 == 0 --> x == 0
110 %B = icmp eq i64 %A, 0
115 ; CHECK: icmp eq i64 %X, 5
116 define i1 @sdiv_icmp2(i64 %X) nounwind {
117 %A = sdiv exact i64 %X, 5 ; X/5 == 1 --> x == 5
118 %B = icmp eq i64 %A, 1
123 ; CHECK: icmp eq i64 %X, -5
124 define i1 @sdiv_icmp3(i64 %X) nounwind {
125 %A = sdiv exact i64 %X, 5 ; X/5 == -1 --> x == -5
126 %B = icmp eq i64 %A, -1
131 ; CHECK: icmp eq i64 %X, 0
132 define i1 @sdiv_icmp4(i64 %X) nounwind {
133 %A = sdiv exact i64 %X, -5 ; X/-5 == 0 --> x == 0
134 %B = icmp eq i64 %A, 0
139 ; CHECK: icmp eq i64 %X, -5
140 define i1 @sdiv_icmp5(i64 %X) nounwind {
141 %A = sdiv exact i64 %X, -5 ; X/-5 == 1 --> x == -5
142 %B = icmp eq i64 %A, 1
147 ; CHECK: icmp eq i64 %X, 5
148 define i1 @sdiv_icmp6(i64 %X) nounwind {
149 %A = sdiv exact i64 %X, -5 ; X/-5 == 1 --> x == 5
150 %B = icmp eq i64 %A, -1