1 ; RUN: opt -early-cse -S < %s | FileCheck %s
2 ; Same as GVN/edge.ll, but updated to reflect EarlyCSE's less powerful
3 ; implementation. EarlyCSE currently doesn't exploit equality comparisons
6 define i32 @f1(i32 %x) {
7 ; CHECK-LABEL: define i32 @f1(
9 %cmp = icmp eq i32 %x, 0
10 br i1 %cmp, label %bb2, label %bb1
14 %cond = phi i32 [ %x, %bb0 ], [ 0, %bb1 ]
15 %foo = add i32 %cond, %x
18 ; CHECK: %cond = phi i32 [ %x, %bb0 ], [ 0, %bb1 ]
21 define i32 @f2(i32 %x) {
22 ; CHECK-LABEL: define i32 @f2(
24 %cmp = icmp ne i32 %x, 0
25 br i1 %cmp, label %bb1, label %bb2
29 %cond = phi i32 [ %x, %bb0 ], [ 0, %bb1 ]
30 %foo = add i32 %cond, %x
33 ; CHECK: %cond = phi i32 [ %x, %bb0 ], [ 0, %bb1 ]
36 define i32 @f3(i32 %x) {
37 ; CHECK-LABEL: define i32 @f3(
39 switch i32 %x, label %bb1 [ i32 0, label %bb2]
43 %cond = phi i32 [ %x, %bb0 ], [ 0, %bb1 ]
44 %foo = add i32 %cond, %x
47 ; CHECK: %cond = phi i32 [ %x, %bb0 ], [ 0, %bb1 ]
51 define void @f4(i8 * %x) {
52 ; CHECK-LABEL: define void @f4(
54 %y = icmp eq i8* null, %x
55 br i1 %y, label %bb2, label %bb1
59 %zed = icmp eq i8* null, %x
61 ; CHECK: call void @g(i1 %y)
65 define double @fcmp_oeq_not_zero(double %x, double %y) {
67 %cmp = fcmp oeq double %y, 2.0
68 br i1 %cmp, label %if, label %return
71 %div = fdiv double %x, %y
75 %retval = phi double [ %div, %if ], [ %x, %entry ]
78 ; CHECK-LABEL: define double @fcmp_oeq_not_zero(
79 ; CHECK: %div = fdiv double %x, %y
82 define double @fcmp_une_not_zero(double %x, double %y) {
84 %cmp = fcmp une double %y, 2.0
85 br i1 %cmp, label %return, label %else
88 %div = fdiv double %x, %y
92 %retval = phi double [ %div, %else ], [ %x, %entry ]
95 ; CHECK-LABEL: define double @fcmp_une_not_zero(
96 ; CHECK: %div = fdiv double %x, %y
99 ; PR22376 - We can't propagate zero constants because -0.0
100 ; compares equal to 0.0. If %y is -0.0 in this test case,
101 ; we would produce the wrong sign on the infinity return value.
102 define double @fcmp_oeq_zero(double %x, double %y) {
104 %cmp = fcmp oeq double %y, 0.0
105 br i1 %cmp, label %if, label %return
108 %div = fdiv double %x, %y
112 %retval = phi double [ %div, %if ], [ %x, %entry ]
115 ; CHECK-LABEL: define double @fcmp_oeq_zero(
116 ; CHECK: %div = fdiv double %x, %y
119 define double @fcmp_une_zero(double %x, double %y) {
121 %cmp = fcmp une double %y, -0.0
122 br i1 %cmp, label %return, label %else
125 %div = fdiv double %x, %y
129 %retval = phi double [ %div, %else ], [ %x, %entry ]
132 ; CHECK-LABEL: define double @fcmp_une_zero(
133 ; CHECK: %div = fdiv double %x, %y
136 ; We also cannot propagate a value if it's not a constant.
137 ; This is because the value could be 0.0 or -0.0.
139 define double @fcmp_oeq_maybe_zero(double %x, double %y, double %z1, double %z2) {
141 %z = fadd double %z1, %z2
142 %cmp = fcmp oeq double %y, %z
143 br i1 %cmp, label %if, label %return
146 %div = fdiv double %x, %z
150 %retval = phi double [ %div, %if ], [ %x, %entry ]
153 ; CHECK-LABEL: define double @fcmp_oeq_maybe_zero(
154 ; CHECK: %div = fdiv double %x, %z
157 define double @fcmp_une_maybe_zero(double %x, double %y, double %z1, double %z2) {
159 %z = fadd double %z1, %z2
160 %cmp = fcmp une double %y, %z
161 br i1 %cmp, label %return, label %else
164 %div = fdiv double %x, %z
168 %retval = phi double [ %div, %else ], [ %x, %entry ]
171 ; CHECK-LABEL: define double @fcmp_une_maybe_zero(
172 ; CHECK: %div = fdiv double %x, %z