d1115c2b84
Summary: We currently optimize the comparison only in SSA, therefore we will miss some optimization opportunities where the input of comparison is lowered from COPY in post-RA. Ie. ExpandPostRA::LowerCopy is called after PPCInstrInfo::optimizeCompareInstr. This patch optimizes the comparison in post-RA and only the cases that compare against zero can be handled. D131374 converts the comparison and its user to a compare against zero with the appropriate predicate on the branch, which creates additional opportunities for this patch. Reviewed By: shchenz, lkail Differential Revision: https://reviews.llvm.org/D131873
143 lines
3.8 KiB
YAML
143 lines
3.8 KiB
YAML
# RUN: llc -mtriple=powerpc64le-linux-gnu -stop-after ppc-pre-emit-peephole %s -o - -verify-machineinstrs | FileCheck %s
|
|
|
|
---
|
|
name: test1
|
|
# The cmp instr is optimized with the record form.
|
|
tracksRegLiveness: true
|
|
body: |
|
|
bb.0.entry:
|
|
successors: %bb.1(0x30000000), %bb.2(0x50000000)
|
|
liveins: $x3, $x4
|
|
renamable $x3 = OR8 killed renamable $x3, killed renamable $x4
|
|
renamable $cr0 = CMPDI renamable $x3, 0, implicit killed $x3
|
|
; CHECK-LABEL: name: test1
|
|
; CHECK: renamable $x3 = OR8_rec renamable $x3, killed renamable $x4, implicit-def $cr0
|
|
; CHECK-NOT: CMPDI
|
|
BCC 68, killed renamable $cr0, %bb.2
|
|
|
|
bb.1:
|
|
$x3 = LI8 102
|
|
BLR8 implicit $lr8, implicit $rm, implicit $x3
|
|
|
|
bb.2:
|
|
$x3 = LI8 116
|
|
BLR8 implicit $lr8, implicit $rm, implicit $x3
|
|
...
|
|
|
|
---
|
|
name: test2
|
|
# The imm of the comparison instr isn't 0.
|
|
tracksRegLiveness: true
|
|
body: |
|
|
bb.0.entry:
|
|
successors: %bb.1(0x30000000), %bb.2(0x50000000)
|
|
liveins: $x3, $x4
|
|
renamable $x3 = OR8 killed renamable $x3, killed renamable $x4
|
|
renamable $cr0 = CMPDI renamable $x3, 2, implicit killed $x3
|
|
; CHECK-LABEL: name: test2
|
|
; CHECK: CMPDI
|
|
BCC 68, killed renamable $cr0, %bb.2
|
|
|
|
bb.1:
|
|
$x3 = LI8 102
|
|
BLR8 implicit $lr8, implicit $rm, implicit $x3
|
|
|
|
bb.2:
|
|
$x3 = LI8 116
|
|
BLR8 implicit $lr8, implicit $rm, implicit $x3
|
|
...
|
|
|
|
---
|
|
name: test3
|
|
# The comparison instr has a implicit def.
|
|
tracksRegLiveness: true
|
|
body: |
|
|
bb.0.entry:
|
|
successors: %bb.1(0x30000000), %bb.2(0x50000000)
|
|
liveins: $x3, $x4
|
|
renamable $x3 = OR8 killed renamable $x3, killed renamable $x4
|
|
renamable $cr0 = CMPDI renamable $x3, 0, implicit-def $x3
|
|
; CHECK-LABEL: name: test3
|
|
; CHECK: CMPDI
|
|
BCC 68, killed renamable $cr0, %bb.2
|
|
|
|
bb.1:
|
|
$x3 = LI8 102
|
|
BLR8 implicit $lr8, implicit $rm, implicit $x3
|
|
|
|
bb.2:
|
|
$x3 = LI8 116
|
|
BLR8 implicit $lr8, implicit $rm, implicit $x3
|
|
...
|
|
|
|
---
|
|
name: test4
|
|
# There is another use for cr0 between OR8 instr and CMPWI instr.
|
|
tracksRegLiveness: true
|
|
body: |
|
|
bb.0.entry:
|
|
successors: %bb.1(0x30000000), %bb.2(0x50000000)
|
|
liveins: $x3, $x4, $cr0
|
|
renamable $x3 = OR8 killed renamable $x3, killed renamable $x4
|
|
renamable $cr1 = MCRF killed $cr0, implicit $x3
|
|
renamable $cr0 = CMPDI renamable $x3, 0, implicit killed $x3, implicit $cr1
|
|
; CHECK-LABEL: name: test4
|
|
; CHECK: CMPDI
|
|
BCC 68, killed renamable $cr0, %bb.2
|
|
|
|
bb.1:
|
|
$x3 = LI8 102
|
|
BLR8 implicit $lr8, implicit $rm, implicit $x3
|
|
|
|
bb.2:
|
|
$x3 = LI8 116
|
|
BLR8 implicit $lr8, implicit $rm, implicit $x3
|
|
...
|
|
|
|
---
|
|
name: test5
|
|
# There is another def for cr0 between OR8 instr and CMPWI instr.
|
|
tracksRegLiveness: true
|
|
body: |
|
|
bb.0.entry:
|
|
successors: %bb.1(0x30000000), %bb.2(0x50000000)
|
|
liveins: $x3, $x4
|
|
renamable $x3 = OR8 killed renamable $x3, renamable $x4
|
|
renamable $cr1 = CMPD renamable $x3, renamable $x4, implicit-def $cr0
|
|
renamable $cr0 = CMPDI renamable $x3, 0, implicit killed $x3, implicit $cr1
|
|
; CHECK-LABEL: name: test5
|
|
; CHECK: CMPDI
|
|
BCC 68, killed renamable $cr0, %bb.2
|
|
|
|
bb.1:
|
|
$x3 = LI8 102
|
|
BLR8 implicit $lr8, implicit $rm, implicit $x3
|
|
|
|
bb.2:
|
|
$x3 = LI8 116
|
|
BLR8 implicit $lr8, implicit $rm, implicit $x3
|
|
...
|
|
|
|
---
|
|
name: test6
|
|
# The SrcReg isn't CR0.
|
|
tracksRegLiveness: true
|
|
body: |
|
|
bb.0.entry:
|
|
successors: %bb.1(0x30000000), %bb.2(0x50000000)
|
|
liveins: $x3, $x4
|
|
renamable $x3 = OR8 killed renamable $x3, killed renamable $x4
|
|
renamable $cr1 = CMPDI renamable $x3, 0, implicit killed $x3
|
|
; CHECK-LABEL: name: test6
|
|
; CHECK: CMPDI
|
|
BCC 68, killed renamable $cr1, %bb.2
|
|
|
|
bb.1:
|
|
$x3 = LI8 102
|
|
BLR8 implicit $lr8, implicit $rm, implicit $x3
|
|
|
|
bb.2:
|
|
$x3 = LI8 116
|
|
BLR8 implicit $lr8, implicit $rm, implicit $x3
|
|
...
|