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Roger Ferrer Ibanez 97e701dc7a [DAGCombiner] Rebuild (setcc x, y, ==) from (xor (xor x, y), 1)
The existing code already considered this case. Unfortunately a typo in
the condition prevents it from triggering. Also the existing code, had
it run, forgot to do the folding.

This fixes PR42876.

Differential Revision: https://reviews.llvm.org/D65802
2020-07-15 07:34:22 +00:00

45 lines
1.0 KiB
LLVM

; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
; RUN: llc -mtriple=aarch64 < %s | FileCheck %s
define void @bool_eq(i1 zeroext %a, i1 zeroext %b, void ()* nocapture %c) nounwind {
; CHECK-LABEL: bool_eq:
; CHECK: // %bb.0: // %entry
; CHECK-NEXT: cmp w0, w1
; CHECK-NEXT: b.eq .LBB0_2
; CHECK-NEXT: // %bb.1: // %if.end
; CHECK-NEXT: ret
; CHECK-NEXT: .LBB0_2: // %if.then
; CHECK-NEXT: br x2
entry:
%0 = xor i1 %a, %b
br i1 %0, label %if.end, label %if.then
if.then:
tail call void %c() #1
br label %if.end
if.end:
ret void
}
define void @bool_ne(i1 zeroext %a, i1 zeroext %b, void ()* nocapture %c) nounwind {
; CHECK-LABEL: bool_ne:
; CHECK: // %bb.0: // %entry
; CHECK-NEXT: cmp w0, w1
; CHECK-NEXT: b.eq .LBB1_2
; CHECK-NEXT: // %bb.1: // %if.then
; CHECK-NEXT: br x2
; CHECK-NEXT: .LBB1_2: // %if.end
; CHECK-NEXT: ret
entry:
%cmp = xor i1 %a, %b
br i1 %cmp, label %if.then, label %if.end
if.then:
tail call void %c() #1
br label %if.end
if.end:
ret void
}