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
31
32
33
34
35
36
37
38
39
40
41
42
43
|
; RUN: opt -S -simplifycfg -simplifycfg-require-and-preserve-domtree=1 -mtriple=aarch64 < %s | FileCheck %s
define i32 @ctlz(i32 %A) {
; CHECK-LABEL: @ctlz(
; CHECK: [[ICMP:%[A-Za-z0-9]+]] = icmp eq i32 %A, 0
; CHECK-NEXT: [[CTZ:%[A-Za-z0-9]+]] = tail call i32 @llvm.ctlz.i32(i32 %A, i1 true)
; CHECK-NEXT: [[SEL:%[A-Za-z0-9.]+]] = select i1 [[ICMP]], i32 32, i32 [[CTZ]]
; CHECK-NEXT: ret i32 [[SEL]]
entry:
%tobool = icmp eq i32 %A, 0
br i1 %tobool, label %cond.end, label %cond.true
cond.true:
%0 = tail call i32 @llvm.ctlz.i32(i32 %A, i1 true)
br label %cond.end
cond.end:
%cond = phi i32 [ %0, %cond.true ], [ 32, %entry ]
ret i32 %cond
}
define i32 @cttz(i32 %A) {
; CHECK-LABEL: @cttz(
; CHECK: [[ICMP:%[A-Za-z0-9]+]] = icmp eq i32 %A, 0
; CHECK-NEXT: [[CTZ:%[A-Za-z0-9]+]] = tail call i32 @llvm.cttz.i32(i32 %A, i1 true)
; CHECK-NEXT: [[SEL:%[A-Za-z0-9.]+]] = select i1 [[ICMP]], i32 32, i32 [[CTZ]]
; CHECK-NEXT: ret i32 [[SEL]]
entry:
%tobool = icmp eq i32 %A, 0
br i1 %tobool, label %cond.end, label %cond.true
cond.true:
%0 = tail call i32 @llvm.cttz.i32(i32 %A, i1 true)
br label %cond.end
cond.end:
%cond = phi i32 [ %0, %cond.true ], [ 32, %entry ]
ret i32 %cond
}
declare i32 @llvm.ctlz.i32(i32, i1)
declare i32 @llvm.cttz.i32(i32, i1)
|
