1; RUN: llc < %s | FileCheck %s
2;
3; PR11431: handle a phi operand that is replaced by a postinc user.
4; LSR first expands %t3 to %t2 in %phi
5; LSR then expands %t2 in %phi into two decrements, one on each loop exit.
6
7target datalayout = "e-p:64:64:64-S128-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-f128:128:128-n8:16:32:64"
8target triple = "x86_64-unknown-linux-gnu"
9
10declare i1 @check() nounwind
11
12; Check that LSR did something close to the behavior at the time of the bug.
13; CHECK: @sqlite3DropTriggerPtr
14; CHECK: incq %r{{[a-d]}}x
15; CHECK: jne
16; CHECK: decq %r{{[a-d]}}x
17; CHECK: ret
18define i64 @sqlite3DropTriggerPtr() nounwind {
19bb:
20  %cmp = call zeroext i1 @check()
21  br label %bb1
22
23bb1:                                              ; preds = %bb4, %bb
24  %t0 = phi i64 [ 0, %bb ], [ %t3, %bb4 ]
25  %t2 = phi i64 [ 1, %bb ], [ %t5, %bb4 ]
26  %t3 = add nsw i64 %t0, 1
27  br i1 %cmp, label %bb4, label %bb8
28
29bb4:                                              ; preds = %bb1
30  %t5 = add nsw i64 %t2, 1
31  br i1 %cmp, label %bb1, label %bb8
32
33bb8:                                              ; preds = %bb8, %bb4
34  %phi = phi i64 [ %t3, %bb1 ], [ %t2, %bb4 ]
35  ret i64 %phi
36}
37