1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
|
; RUN: opt -indvars -S < %s | FileCheck %s
; indvars should transform the phi node pair from the for-loop
; CHECK-LABEL: @main(
; CHECK: ret = phi i32 [ 0, %entry ], [ 0, {{.*}} ]
@c = common global i32 0, align 4
define i32 @main() #0 {
entry:
%0 = load i32, i32* @c, align 4
%tobool = icmp eq i32 %0, 0
br i1 %tobool, label %for.body, label %exit
for.body:
%inc2 = phi i32 [ 0, %entry ], [ %inc, %for.inc ]
%sub = add i32 %inc2, -1
%cmp1 = icmp uge i32 %sub, %inc2
%conv = zext i1 %cmp1 to i32
br label %for.inc
for.inc:
%inc = add nsw i32 %inc2, 1
%cmp = icmp slt i32 %inc, 5
br i1 %cmp, label %for.body, label %exit
exit:
%ret = phi i32 [ 0, %entry ], [ %conv, %for.inc ]
ret i32 %ret
}
|
