1; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
2; RUN: opt -simplifycfg -simplifycfg-require-and-preserve-domtree=1 -keep-loops=false -S < %s | FileCheck %s
3; RUN: opt -passes='simplifycfg<no-keep-loops>' -S < %s | FileCheck %s
4
5; It's not worthwhile to if-convert one of the phi nodes and leave
6; the other behind, because that still requires a branch. If
7; SimplifyCFG if-converts one of the phis, it should do both.
8
9define i32 @upper_bound(i32* %r, i32 %high, i32 %k) nounwind {
10; CHECK-LABEL: @upper_bound(
11; CHECK-NEXT:  entry:
12; CHECK-NEXT:    br label [[WHILE_COND:%.*]]
13; CHECK:       while.cond:
14; CHECK-NEXT:    [[HIGH_ADDR_0:%.*]] = phi i32 [ [[HIGH:%.*]], [[ENTRY:%.*]] ], [ [[SPEC_SELECT:%.*]], [[WHILE_BODY:%.*]] ]
15; CHECK-NEXT:    [[LOW_0:%.*]] = phi i32 [ 0, [[ENTRY]] ], [ [[SPEC_SELECT1:%.*]], [[WHILE_BODY]] ]
16; CHECK-NEXT:    [[CMP:%.*]] = icmp ult i32 [[LOW_0]], [[HIGH_ADDR_0]]
17; CHECK-NEXT:    br i1 [[CMP]], label [[WHILE_BODY]], label [[WHILE_END:%.*]]
18; CHECK:       while.body:
19; CHECK-NEXT:    [[ADD:%.*]] = add i32 [[LOW_0]], [[HIGH_ADDR_0]]
20; CHECK-NEXT:    [[DIV:%.*]] = udiv i32 [[ADD]], 2
21; CHECK-NEXT:    [[IDXPROM:%.*]] = zext i32 [[DIV]] to i64
22; CHECK-NEXT:    [[ARRAYIDX:%.*]] = getelementptr inbounds i32, i32* [[R:%.*]], i64 [[IDXPROM]]
23; CHECK-NEXT:    [[TMP0:%.*]] = load i32, i32* [[ARRAYIDX]], align 4
24; CHECK-NEXT:    [[CMP1:%.*]] = icmp ult i32 [[K:%.*]], [[TMP0]]
25; CHECK-NEXT:    [[ADD2:%.*]] = add i32 [[DIV]], 1
26; CHECK-NEXT:    [[SPEC_SELECT]] = select i1 [[CMP1]], i32 [[DIV]], i32 [[HIGH_ADDR_0]]
27; CHECK-NEXT:    [[SPEC_SELECT1]] = select i1 [[CMP1]], i32 [[LOW_0]], i32 [[ADD2]]
28; CHECK-NEXT:    br label [[WHILE_COND]]
29; CHECK:       while.end:
30; CHECK-NEXT:    ret i32 [[LOW_0]]
31;
32entry:
33  br label %while.cond
34
35while.cond:                                       ; preds = %if.then, %if.else, %entry
36  %high.addr.0 = phi i32 [ %high, %entry ], [ %div, %if.then ], [ %high.addr.0, %if.else ]
37  %low.0 = phi i32 [ 0, %entry ], [ %low.0, %if.then ], [ %add2, %if.else ]
38  %cmp = icmp ult i32 %low.0, %high.addr.0
39  br i1 %cmp, label %while.body, label %while.end
40
41while.body:                                       ; preds = %while.cond
42  %add = add i32 %low.0, %high.addr.0
43  %div = udiv i32 %add, 2
44  %idxprom = zext i32 %div to i64
45  %arrayidx = getelementptr inbounds i32, i32* %r, i64 %idxprom
46  %0 = load i32, i32* %arrayidx
47  %cmp1 = icmp ult i32 %k, %0
48  br i1 %cmp1, label %if.then, label %if.else
49
50if.then:                                          ; preds = %while.body
51  br label %while.cond
52
53if.else:                                          ; preds = %while.body
54  %add2 = add i32 %div, 1
55  br label %while.cond
56
57while.end:                                        ; preds = %while.cond
58  ret i32 %low.0
59}
60