1 ; RUN: llc -O2 -arm-atomic-cfg-tidy=0 -o - %s | FileCheck %s
2 target datalayout = "e-m:e-p:32:32-i64:64-v128:64:128-a:0:32-n32-S64"
3 target triple = "thumbv8-unknown-linux-gnueabihf"
5 ; This is a tricky test case.
6 ; The point of it is to create a diamond where both the true block and the
7 ; false block clobber the predicate when viewed as a whole, but only one of them
8 ; clobbers the predicate when considering the instructions they share.
10 ; Function Attrs: nounwind
11 define void @BN_kronecker(i1 %a, i32 %b) #0 {
13 br label %while.cond38
15 while.cond38: ; preds = %if.end111, %entry
16 %cmp79 = icmp eq i32 0, 0
17 br i1 %a, label %cond.true77, label %cond.false87
20 ; CHECK-NEXT: @ in Loop
21 ; CHECK-NEXT: cmp.w {{r[0-9]+}}, #0
25 ; N.b. 16-bit mov instruction in IT block does not set flags.
29 cond.true77: ; preds = %while.cond38
30 br i1 %cmp79, label %cond.end84, label %cond.false81
32 cond.false81: ; preds = %cond.true77
33 %0 = load i32, i32* null, align 4
36 cond.end84: ; preds = %cond.false81, %cond.true77
37 %cond85 = phi i32 [ %0, %cond.false81 ], [ 0, %cond.true77 ]
38 %neg86 = xor i32 %cond85, -1
39 br label %cond.false101
41 cond.false87: ; preds = %while.cond38
42 br i1 %cmp79, label %cond.false101, label %cond.false91
44 cond.false91: ; preds = %cond.false87
45 br label %cond.false101
47 cond.false101: ; preds = %cond.false91, %cond.false87, %cond.end84
48 %cond97 = phi i32 [ %neg86, %cond.end84 ], [ %b, %cond.false91 ], [ 0, %cond.false87 ]
49 %1 = load i32, i32* null, align 4
50 %and106 = and i32 %cond97, %1
51 %and107 = and i32 %and106, 2
52 %tobool108 = icmp ne i32 %and107, 0
53 br i1 %tobool108, label %if.then109, label %if.end111
55 if.then109: ; preds = %cond.false101
56 store i32 0, i32* undef, align 4
59 if.end111: ; preds = %if.then109, %cond.false101
60 %tobool113 = icmp ne i32 0, 0
61 br i1 %tobool113, label %while.cond38, label %end
63 end: ; preds = %if.end111
67 attributes #0 = { nounwind }