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
| ; REQUIRES: asserts
; RUN: opt < %s -loop-unswitch -stats -disable-output 2>&1 | FileCheck %s
; RUN: opt < %s -loop-unswitch -enable-mssa-loop-dependency=true -verify-memoryssa -stats -disable-output 2>&1 | FileCheck %s
; PR 3170
define i32 @a(i32 %x, i32 %y) nounwind {
; CHECK: 1 loop-unswitch - Number of branches unswitched
; CHECK-NOT: Number of branches unswitched
entry:
%0 = icmp ult i32 0, %y ; <i1> [#uses=1]
br i1 %0, label %bb.nph, label %bb4
bb.nph: ; preds = %entry
%1 = icmp eq i32 %x, 0 ; <i1> [#uses=1]
br label %bb
bb: ; preds = %bb.nph, %bb3
%i.01 = phi i32 [ %3, %bb3 ], [ 0, %bb.nph ] ; <i32> [#uses=1]
br i1 %1, label %bb2, label %bb1
bb1: ; preds = %bb
%2 = tail call i32 (...) @b() nounwind ; <i32> [#uses=0]
br label %bb2
bb2: ; preds = %bb, %bb1
%3 = add i32 %i.01, 1 ; <i32> [#uses=2]
br label %bb3
bb3: ; preds = %bb2
%i.0 = phi i32 [ %3, %bb2 ] ; <i32> [#uses=1]
%4 = icmp ult i32 %i.0, %y ; <i1> [#uses=1]
br i1 %4, label %bb, label %bb3.bb4_crit_edge
bb3.bb4_crit_edge: ; preds = %bb3
br label %bb4
bb4: ; preds = %bb3.bb4_crit_edge, %entry
ret i32 0
}
declare i32 @b(...)
|