mirror of
https://github.com/RPCS3/llvm-mirror.git
synced 2024-11-23 19:23:23 +01:00
3920f7d8d0
Only custom lower uaddo+addcarry or usubo+subcarry chains and leave mixtures like usubo+addcarry or uaddo+subcarry to the generic legalizer. Otherwise we run into issues because SystemZ uses different CC values for carries and borrows. Fixes https://bugs.llvm.org/show_bug.cgi?id=42512. Differential Revision: https://reviews.llvm.org/D64213 llvm-svn: 365242
24 lines
739 B
LLVM
24 lines
739 B
LLVM
; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
|
|
; RUN: llc < %s -mtriple=s390x-linux-gnu | FileCheck %s
|
|
|
|
define i8 @test(i8 %x) {
|
|
; CHECK-LABEL: test:
|
|
; CHECK: # %bb.0:
|
|
; CHECK-NEXT: slgfi %r0, 1
|
|
; CHECK-NEXT: ipm %r0
|
|
; CHECK-NEXT: afi %r0, -536870912
|
|
; CHECK-NEXT: srl %r0, 31
|
|
; CHECK-NEXT: ar %r2, %r0
|
|
; CHECK-NEXT: br %r14
|
|
%usubo = tail call { i64, i1 } @llvm.usub.with.overflow.i64(i64 undef, i64 1)
|
|
%ov = extractvalue { i64, i1 } %usubo, 1
|
|
%ovext = zext i1 %ov to i8
|
|
%ret = add i8 %x, %ovext
|
|
ret i8 %ret
|
|
}
|
|
|
|
; Function Attrs: nounwind readnone speculatable
|
|
declare { i64, i1 } @llvm.usub.with.overflow.i64(i64, i64) #0
|
|
|
|
attributes #0 = { nounwind readnone speculatable }
|