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
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
|
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; REQUIRES: asserts
; RUN: opt -S -enable-loop-simplifycfg-term-folding=true -passes='require<domtree>,loop(indvars,loop-simplifycfg)' -verify-loop-info -verify-dom-info -verify-loop-lcssa 2>&1 < %s | FileCheck %s
; RUN: opt -S -enable-loop-simplifycfg-term-folding=true -passes=indvars,loop-simplifycfg -verify-memoryssa -verify-loop-info -verify-dom-info -verify-loop-lcssa 2>&1 < %s | FileCheck %s
define void @test(i1 %c) {
; CHECK-LABEL: @test(
; CHECK-NEXT: entry:
; CHECK-NEXT: switch i32 0, label [[ENTRY_SPLIT:%.*]] [
; CHECK-NEXT: i32 1, label [[DEAD_EXIT:%.*]]
; CHECK-NEXT: ]
; CHECK: entry.split:
; CHECK-NEXT: br label [[OUTER:%.*]]
; CHECK: outer:
; CHECK-NEXT: br i1 [[C:%.*]], label [[TO_FOLD:%.*]], label [[LATCH:%.*]]
; CHECK: to_fold:
; CHECK-NEXT: br i1 [[C]], label [[LATCH]], label [[INNER_PREHEADER:%.*]]
; CHECK: inner.preheader:
; CHECK-NEXT: br label [[INNER:%.*]]
; CHECK: inner:
; CHECK-NEXT: br i1 false, label [[INNER_LATCH:%.*]], label [[UNDEAD:%.*]]
; CHECK: inner_latch:
; CHECK-NEXT: br i1 true, label [[INNER]], label [[LATCH_LOOPEXIT:%.*]]
; CHECK: undead:
; CHECK-NEXT: br label [[LATCH]]
; CHECK: latch.loopexit:
; CHECK-NEXT: br label [[LATCH]]
; CHECK: latch:
; CHECK-NEXT: br label [[OUTER]]
; CHECK: dead_exit:
; CHECK-NEXT: ret void
;
entry:
br label %outer
outer:
br i1 %c, label %to_fold, label %latch
to_fold:
br i1 %c, label %latch, label %inner
inner:
%iv = phi i32 [0, %to_fold], [%iv.next, %inner_latch]
%never = icmp sgt i32 %iv, 40
br i1 %never, label %inner_latch, label %undead
inner_latch:
%iv.next = add i32 %iv, 1
%cmp = icmp slt i32 %iv.next, 10
br i1 %cmp, label %inner, label %latch
undead:
br label %latch
latch:
br i1 true, label %outer, label %dead_exit
dead_exit:
ret void
}
|
