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|
# RUN: llc %s -o - -run-pass=peephole-opt | FileCheck %s
# Check that we don't optimize out a subs due to areCFlagsAccessedBetweenInstrs
# returning the wrong result; it should check the cneg before the subs which does
# modify cflags.
# CHECK-LABEL: f
# CHECK: SUBSWrr
# CHECK-NEXT: SUBWrr
# CHECK-NEXT: CSNEGWr
# CHECK-NEXT: SUBSWri
# CHECK-NEXT: CSNEGWr
# CHECK-NEXT: Bcc
--- |
target datalayout = "e-m:w-p:64:64-i32:32-i64:64-i128:128-n32:64-S128"
target triple = "aarch64-w64-windows-gnu"
define dso_local void @f() {
ret void
}
...
---
name: f
registers:
- { id: 43, class: gpr32, preferred-register: '' }
- { id: 44, class: gpr32, preferred-register: '' }
- { id: 46, class: gpr32, preferred-register: '' }
- { id: 47, class: gpr32, preferred-register: '' }
- { id: 48, class: gpr32common, preferred-register: '' }
- { id: 49, class: gpr32common, preferred-register: '' }
- { id: 50, class: gpr32, preferred-register: '' }
- { id: 51, class: gpr32, preferred-register: '' }
- { id: 52, class: gpr32, preferred-register: '' }
- { id: 53, class: gpr32, preferred-register: '' }
body: |
bb.0:
successors: %bb.0
%43 = MOVi32imm 1
%44 = MOVi32imm 1
%46 = MOVi32imm 1
%47 = MOVi32imm 1
%48 = nsw SUBSWrr killed %43, killed %46, implicit-def dead $nzcv
%49 = nsw SUBSWrr killed %44, killed %47, implicit-def dead $nzcv
%50 = SUBSWri %48, 0, 0, implicit-def $nzcv
%51 = CSNEGWr %48, %48, 5, implicit $nzcv
%52 = SUBSWri %49, 0, 0, implicit-def $nzcv
%53 = CSNEGWr %49, %49, 5, implicit $nzcv
Bcc 1, %bb.0, implicit $nzcv
RET_ReallyLR
...
|
