| ; RUN: llc < %s | FileCheck %s |
| ; |
| ; PR11431: handle a phi operand that is replaced by a postinc user. |
| ; LSR first expands %t3 to %t2 in %phi |
| ; LSR then expands %t2 in %phi into two decrements, one on each loop exit. |
| |
| target 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" |
| target triple = "x86_64-unknown-linux-gnu" |
| |
| declare i1 @check() nounwind |
| |
| ; Check that LSR did something close to the behavior at the time of the bug. |
| ; CHECK: @sqlite3DropTriggerPtr |
| ; CHECK: incq %rax |
| ; CHECK: jne |
| ; CHECK: decq %rax |
| ; CHECK: ret |
| define i64 @sqlite3DropTriggerPtr() nounwind { |
| bb: |
| %cmp = call zeroext i1 @check() |
| br label %bb1 |
| |
| bb1: ; preds = %bb4, %bb |
| %t0 = phi i64 [ 0, %bb ], [ %t3, %bb4 ] |
| %t2 = phi i64 [ 1, %bb ], [ %t5, %bb4 ] |
| %t3 = add nsw i64 %t0, 1 |
| br i1 %cmp, label %bb4, label %bb8 |
| |
| bb4: ; preds = %bb1 |
| %t5 = add nsw i64 %t2, 1 |
| br i1 %cmp, label %bb1, label %bb8 |
| |
| bb8: ; preds = %bb8, %bb4 |
| %phi = phi i64 [ %t3, %bb1 ], [ %t2, %bb4 ] |
| ret i64 %phi |
| } |
