1; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py 2; RUN: llc < %s | FileCheck %s 3; 4; PR11431: handle a phi operand that is replaced by a postinc user. 5; LSR first expands %t3 to %t2 in %phi 6; LSR then expands %t2 in %phi into two decrements, one on each loop exit. 7 8target 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" 9target triple = "x86_64-unknown-linux-gnu" 10 11declare i1 @check() nounwind 12 13; Check that LSR did something close to the behavior at the time of the bug. 14define i64 @sqlite3DropTriggerPtr() nounwind { 15; CHECK-LABEL: sqlite3DropTriggerPtr: 16; CHECK: # %bb.0: # %bb 17; CHECK-NEXT: pushq %rbx 18; CHECK-NEXT: movl $1, %ebx 19; CHECK-NEXT: callq check@PLT 20; CHECK-NEXT: .p2align 4 21; CHECK-NEXT: .LBB0_1: # %bb1 22; CHECK-NEXT: # =>This Inner Loop Header: Depth=1 23; CHECK-NEXT: testb %al, %al 24; CHECK-NEXT: je .LBB0_4 25; CHECK-NEXT: # %bb.2: # %bb4 26; CHECK-NEXT: # in Loop: Header=BB0_1 Depth=1 27; CHECK-NEXT: incq %rbx 28; CHECK-NEXT: testb %al, %al 29; CHECK-NEXT: jne .LBB0_1 30; CHECK-NEXT: # %bb.3: # %bb8split 31; CHECK-NEXT: decq %rbx 32; CHECK-NEXT: .LBB0_4: # %bb8 33; CHECK-NEXT: movq %rbx, %rax 34; CHECK-NEXT: popq %rbx 35; CHECK-NEXT: retq 36bb: 37 %cmp = call zeroext i1 @check() 38 br label %bb1 39 40bb1: ; preds = %bb4, %bb 41 %t0 = phi i64 [ 0, %bb ], [ %t3, %bb4 ] 42 %t2 = phi i64 [ 1, %bb ], [ %t5, %bb4 ] 43 %t3 = add nsw i64 %t0, 1 44 br i1 %cmp, label %bb4, label %bb8 45 46bb4: ; preds = %bb1 47 %t5 = add nsw i64 %t2, 1 48 br i1 %cmp, label %bb1, label %bb8 49 50bb8: ; preds = %bb8, %bb4 51 %phi = phi i64 [ %t3, %bb1 ], [ %t2, %bb4 ] 52 ret i64 %phi 53} 54