pr27681.mir
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# RUN: llc -mtriple=i386-unknown-linux-gnu -mcpu=slm -run-pass post-RA-sched -o - %s | FileCheck %s
#
# Verify that the critical antidependence breaker does not consider
# a high byte register as available as a replacement register
# in a certain context.
--- |
define void @main() { ret void }
...
---
# CHECK-LABEL: main
name: main
tracksRegLiveness: true
frameInfo:
stackSize: 52
fixedStack:
- { id: 0, type: spill-slot, offset: -20, size: 4, alignment: 4, callee-saved-register: '$esi' }
- { id: 1, type: spill-slot, offset: -16, size: 4, alignment: 4, callee-saved-register: '$edi' }
- { id: 2, type: spill-slot, offset: -12, size: 4, alignment: 4, callee-saved-register: '$ebx' }
- { id: 3, type: spill-slot, offset: -8, size: 4, alignment: 4, callee-saved-register: '$ebp' }
stack:
- { id: 0, type: spill-slot, offset: -53, size: 1, alignment: 1 }
- { id: 1, type: spill-slot, offset: -48, size: 4, alignment: 4 }
- { id: 2, type: spill-slot, offset: -32, size: 4, alignment: 4 }
body: |
bb.0:
liveins: $ebp, $ebx, $edi, $esi
frame-setup PUSH32r killed $ebp, implicit-def $esp, implicit $esp
frame-setup PUSH32r killed $ebx, implicit-def $esp, implicit $esp
frame-setup PUSH32r killed $edi, implicit-def $esp, implicit $esp
frame-setup PUSH32r killed $esi, implicit-def $esp, implicit $esp
$esp = frame-setup SUB32ri8 $esp, 36, implicit-def dead $eflags
$eax = MOV32ri 1
$ebp = MOV32ri 2
$ebx = MOV32ri 3
$ecx = MOV32ri 4
$edi = MOV32ri 5
$edx = MOV32ri 6
bb.1:
liveins: $eax, $ebp, $ebx, $ecx, $edi, $edx
$ebp = SHR32rCL killed $ebp, implicit-def dead $eflags, implicit $cl
$ebp = XOR32rr killed $ebp, killed $ebx, implicit-def dead $eflags
TEST32rr $edx, $edx, implicit-def $eflags
$cl = SETCCr 5, implicit $eflags
; This %bl def is antidependent on the above use of $ebx
$bl = MOV8rm $esp, 1, $noreg, 3, _ ; :: (load 1 from %stack.0)
$cl = OR8rr killed $cl, $bl, implicit-def dead $eflags
$esi = MOVZX32rr8 killed $cl
$esi = ADD32rr killed $esi, killed $edi, implicit-def dead $eflags
$ecx = MOV32rm $esp, 1, $noreg, 24, _ ; :: (load 4 from %stack.2)
$edx = SAR32rCL killed $edx, implicit-def dead $eflags, implicit $cl
TEST32rr killed $edx, $edx, implicit-def $eflags
$cl = SETCCr 5, implicit $eflags
; Verify that removal of the $bl antidependence does not use $ch
; as a replacement register.
; CHECK: $cl = AND8rr killed $cl, killed $b
$cl = AND8rr killed $cl, killed $bl, implicit-def dead $eflags
CMP32ri8 $ebp, -1, implicit-def $eflags
$edx = MOV32ri 0
JCC_1 %bb.3, 4, implicit $eflags
bb.2:
liveins: $cl, $eax, $ebp, $esi
OR32mr $esp, 1, $noreg, 8, $noreg, killed $eax, implicit-def $eflags ; :: (store 4 into %stack.1)
$dl = SETCCr 5, implicit $eflags, implicit-def $edx
bb.3:
liveins: $cl, $ebp, $edx, $esi
$eax = XOR32rr undef $eax, undef $eax, implicit-def dead $eflags
$esp = ADD32ri8 $esp, 36, implicit-def dead $eflags
$esi = POP32r implicit-def $esp, implicit $esp
$edi = POP32r implicit-def $esp, implicit $esp
$ebx = POP32r implicit-def $esp, implicit $esp
$ebp = POP32r implicit-def $esp, implicit $esp
RET 0, $eax
...