# RUN: llc -mtriple=aarch64--linux-gnu -run-pass=aarch64-copyelim %s -verify-machineinstrs -o - | FileCheck %s
---
# Check that bb.0 COPY is seen through to allow the bb.1 COPY of XZR to be removed.
# CHECK-LABEL: name: test1
# CHECK-NOT: COPY $xzr
name: test1
tracksRegLiveness: true
body: |
bb.0:
liveins: $x0, $x1
$x0 = COPY $x1
CBNZX $x1, %bb.2
bb.1:
$x0 = COPY $xzr
B %bb.3
bb.2:
liveins: $x1
$x0 = LDRXui $x1, 0
bb.3:
liveins: $x0
RET_ReallyLR implicit $x0
...
# Similar to test1, but with reversed COPY.
# CHECK-LABEL: name: test2
# CHECK-NOT: COPY $xzr
name: test2
tracksRegLiveness: true
body: |
bb.0:
liveins: $x0, $x1
$x1 = COPY $x0
CBNZX $x1, %bb.2
bb.1:
$x0 = COPY $xzr
B %bb.3
bb.2:
liveins: $x1
$x0 = LDRXui $x1, 0
bb.3:
liveins: $x0
RET_ReallyLR implicit $x0
...
# Similar to test1, but with a clobber that prevents removal of the XZR COPY.
# CHECK-LABEL: name: test3
# CHECK: COPY $xzr
name: test3
tracksRegLiveness: true
body: |
bb.0:
liveins: $x0, $x1, $x2
$x0 = COPY $x1
$x1 = LDRXui $x1, 0
CBNZX $x1, %bb.2
bb.1:
$x0 = COPY $xzr
B %bb.3
bb.2:
liveins: $x1
$x0 = LDRXui $x1, 0
bb.3:
liveins: $x0
RET_ReallyLR implicit $x0
...
# Similar to test2, but with a clobber that prevents removal of the XZR COPY.
# CHECK-LABEL: name: test4
# CHECK: COPY $xzr
name: test4
tracksRegLiveness: true
body: |
bb.0:
liveins: $x0, $x1, $x2
$x1 = COPY $x0
$x1 = LDRXui $x1, 0
CBNZX $x1, %bb.2
bb.1:
$x0 = COPY $xzr
B %bb.3
bb.2:
liveins: $x1
$x0 = LDRXui $x1, 0
bb.3:
liveins: $x0
RET_ReallyLR implicit $x0
...
# Similar to test2, but with a clobber that prevents removal of the XZR COPY.
# CHECK-LABEL: name: test5
# CHECK: COPY $xzr
name: test5
tracksRegLiveness: true
body: |
bb.0:
liveins: $x0, $x1, $x2
$x1 = COPY $x0
$x0 = LDRXui $x1, 0
CBNZX $x1, %bb.2
bb.1:
$x0 = COPY $xzr
B %bb.3
bb.2:
liveins: $x1
$x0 = LDRXui $x1, 0
bb.3:
liveins: $x0
RET_ReallyLR implicit $x0
...
# Similar to test1, but with two levels of COPYs.
# CHECK-LABEL: name: test6
# CHECK-NOT: COPY $xzr
name: test6
tracksRegLiveness: true
body: |
bb.0:
liveins: $x0, $x1, $x2
$x2 = COPY $x0
$x1 = COPY $x2
CBNZX $x1, %bb.2
bb.1:
$x0 = COPY $xzr
B %bb.3
bb.2:
liveins: $x1
$x0 = LDRXui $x1, 0
bb.3:
liveins: $x0
RET_ReallyLR implicit $x0
...
# Similar to test1, but with two levels of COPYs and a clobber preventing COPY of XZR removal.
# CHECK-LABEL: name: test7
# CHECK: COPY $xzr
name: test7
tracksRegLiveness: true
body: |
bb.0:
liveins: $x0, $x1, $x2
$x2 = COPY $x0
$x0 = LDRXui $x1, 0
$x1 = COPY $x2
CBNZX $x1, %bb.2
bb.1:
$x0 = COPY $xzr
B %bb.3
bb.2:
liveins: $x1
$x0 = LDRXui $x1, 0
bb.3:
liveins: $x0
RET_ReallyLR implicit $x0
...
# Check that the TargetRegs vector clobber update loop in
# AArch64RedundantCopyElimination::optimizeCopy works correctly.
# CHECK-LABEL: name: test8
# CHECK: x0 = COPY $xzr
# CHECK: x1 = COPY $xzr
name: test8
tracksRegLiveness: true
body: |
bb.0:
liveins: $x0, $x1, $x2
$x1 = COPY $x0
CBNZX $x1, %bb.2
bb.1:
liveins: $x0, $x2
$x0, $x1 = LDPXi $x2, 0
$x0 = COPY $xzr
$x1 = COPY $xzr
B %bb.3
bb.2:
liveins: $x1
$x0 = LDRXui $x1, 0
bb.3:
liveins: $x0
RET_ReallyLR implicit $x0
...
# Check that copy isn't removed from a block with multiple predecessors.
# CHECK-LABEL: name: test9
# CHECK: x0 = COPY $xzr
# CHECK-NEXT: B %bb.3
name: test9
tracksRegLiveness: true
body: |
bb.0:
liveins: $x0, $x1
CBNZX $x0, %bb.2
bb.1:
liveins: $x0
$x0 = COPY $xzr
B %bb.3
bb.2:
liveins: $x1
$x0 = LDRXui $x1, 0
CBNZX $x1, %bb.1
bb.3:
liveins: $x0
RET_ReallyLR implicit $x0
...
# Eliminate redundant MOVi32imm 7 in bb.1
# Note: 32-bit compare/32-bit move imm
# Kill marker should be removed from compare.
# CHECK-LABEL: name: test10
# CHECK: SUBSWri $w0, 7, 0, implicit-def $nzcv
# CHECK: bb.1:
# CHECK-NOT: MOVi32imm
name: test10
tracksRegLiveness: true
body: |
bb.0.entry:
liveins: $w0, $x1
dead $wzr = SUBSWri killed $w0, 7, 0, implicit-def $nzcv
Bcc 1, %bb.2, implicit killed $nzcv
B %bb.1
bb.1:
liveins: $x1
$w0 = MOVi32imm 7
STRWui killed $w0, killed $x1, 0
bb.2:
RET_ReallyLR
...
# Eliminate redundant MOVi32imm 7 in bb.1
# Note: 64-bit compare/32-bit move imm w/implicit def
# Kill marker should be removed from compare.
# CHECK-LABEL: name: test11
# CHECK: SUBSXri $x0, 7, 0, implicit-def $nzcv
# CHECK: bb.1:
# CHECK-NOT: MOVi32imm
name: test11
tracksRegLiveness: true
body: |
bb.0.entry:
liveins: $x0, $x1
dead $xzr = SUBSXri killed $x0, 7, 0, implicit-def $nzcv
Bcc 1, %bb.2, implicit killed $nzcv
B %bb.1
bb.1:
liveins: $x1
$w0 = MOVi32imm 7, implicit-def $x0
STRXui killed $x0, killed $x1, 0
bb.2:
RET_ReallyLR
...
# Eliminate redundant MOVi32imm 7 in bb.1
# Note: 64-bit compare/32-bit move imm
# Kill marker should be removed from compare.
# CHECK-LABEL: name: test12
# CHECK: SUBSXri $x0, 7, 0, implicit-def $nzcv
# CHECK: bb.1:
# CHECK-NOT: MOVi32imm
name: test12
tracksRegLiveness: true
body: |
bb.0.entry:
liveins: $x0, $x1
dead $xzr = SUBSXri killed $x0, 7, 0, implicit-def $nzcv
Bcc 1, %bb.2, implicit killed $nzcv
B %bb.1
bb.1:
liveins: $x1
$w0 = MOVi32imm 7
STRWui killed $w0, killed $x1, 0
bb.2:
RET_ReallyLR
...
# Don't eliminate MOVi32imm 7 in bb.1 as we don't necessarily know the upper 32-bits.
# Note: 32-bit compare/32-bit move imm w/implicit def
# Kill marker should remain on compare.
# CHECK-LABEL: name: test13
# CHECK: SUBSWri killed $w0, 7, 0, implicit-def $nzcv
# CHECK: bb.1:
# CHECK: MOVi32imm
name: test13
tracksRegLiveness: true
body: |
bb.0.entry:
liveins: $w0, $x1
dead $wzr = SUBSWri killed $w0, 7, 0, implicit-def $nzcv
Bcc 1, %bb.2, implicit killed $nzcv
B %bb.1
bb.1:
liveins: $x1
$w0 = MOVi32imm 7, implicit-def $x0
STRXui killed $x0, killed $x1, 0
bb.2:
RET_ReallyLR
...
# We can't eliminate the MOVi32imm because of the clobbering LDRWui.
# CHECK-LABEL: name: test14
# CHECK: bb.1:
# CHECK: MOVi32imm
name: test14
tracksRegLiveness: true
body: |
bb.0.entry:
liveins: $w0, $x1, $x2
dead $wzr = SUBSWri killed $w0, 7, 0, implicit-def $nzcv
$w0 = LDRWui $x1, 0
STRWui killed $w0, killed $x2, 0
Bcc 1, %bb.2, implicit killed $nzcv
B %bb.1
bb.1:
liveins: $x1
$w0 = MOVi32imm 7
STRWui killed $w0, killed $x1, 0
bb.2:
RET_ReallyLR
...
# We can't eliminate the MOVi32imm because of the clobbering LDRWui.
# CHECK-LABEL: name: test15
# CHECK: bb.1:
# CHECK: MOVi32imm
name: test15
tracksRegLiveness: true
body: |
bb.0.entry:
liveins: $w0, $x1, $x2
dead $wzr = SUBSWri killed $w0, 7, 0, implicit-def $nzcv
Bcc 1, %bb.2, implicit killed $nzcv
B %bb.1
bb.1:
liveins: $x1, $x2
$w0 = LDRWui $x1, 0
STRWui killed $w0, killed $x2, 0
$w0 = MOVi32imm 7
STRWui killed $w0, killed $x1, 0
bb.2:
RET_ReallyLR
...
# Check that bb.0 COPY is seen through to allow the bb.1 MOVi32imm to be removed.
# CHECK-LABEL: name: test16
# CHECK: bb.1:
# CHECK-NOT: MOVi32imm
name: test16
tracksRegLiveness: true
body: |
bb.0.entry:
liveins: $w0, $x1
dead $wzr = SUBSWri $w0, 7, 0, implicit-def $nzcv
$w2 = COPY $w0
Bcc 1, %bb.2, implicit killed $nzcv
B %bb.1
bb.1:
liveins: $x1
$w2 = MOVi32imm 7
STRWui killed $w2, killed $x1, 0
bb.2:
RET_ReallyLR
...
# Check that bb.1 MOVi32imm is not removed due to self clobbering compare.
# CHECK-LABEL: name: test17
# CHECK: bb.1:
# CHECK: MOVi32imm
name: test17
tracksRegLiveness: true
body: |
bb.0.entry:
liveins: $w0, $x1
dead $w0 = SUBSWri killed $w0, 7, 0, implicit-def $nzcv
Bcc 1, %bb.2, implicit killed $nzcv
B %bb.1
bb.1:
liveins: $x1
$w0 = MOVi32imm 7
STRWui killed $w0, killed $x1, 0
bb.2:
RET_ReallyLR
...
# Make sure the MOVi64imm is not removed. In one version of this patch the
# MOVi64imm immediate was truncated to 32 bits and incorrectly matched because
# the low 32 bits of 4252017623040 are all zero.
# CHECK-LABEL: name: test18
# CHECK: bb.1:
# CHECK: MOVi64imm
name: test18
tracksRegLiveness: true
body: |
bb.0.entry:
liveins: $x0, $x1
CBNZX killed $x0, %bb.2
B %bb.1
bb.1:
liveins: $x1
$x0 = MOVi64imm 4252017623040
STRXui killed $x0, killed $x1, 0
bb.2:
RET_ReallyLR
...
# Eliminate redundant MOVi32imm -1 in bb.1
# Note: 32-bit compare/32-bit move imm
# Kill marker should be removed from compare.
# CHECK-LABEL: name: test19
# CHECK: ADDSWri $w0, 1, 0, implicit-def $nzcv
# CHECK: bb.1:
# CHECK-NOT: MOVi32imm
name: test19
tracksRegLiveness: true
body: |
bb.0.entry:
liveins: $w0, $x1
dead $wzr = ADDSWri killed $w0, 1, 0, implicit-def $nzcv
Bcc 1, %bb.2, implicit killed $nzcv
B %bb.1
bb.1:
liveins: $x1
$w0 = MOVi32imm -1
STRWui killed $w0, killed $x1, 0
bb.2:
RET_ReallyLR
...
# Eliminate redundant MOVi64imm -1 in bb.1
# Note: 64-bit compare/64-bit move imm
# Kill marker should be removed from compare.
# CHECK-LABEL: name: test20
# CHECK: ADDSXri $x0, 1, 0, implicit-def $nzcv
# CHECK: bb.1:
# CHECK-NOT: MOVi64imm
name: test20
tracksRegLiveness: true
body: |
bb.0:
liveins: $x0, $x1
dead $xzr = ADDSXri killed $x0, 1, 0, implicit-def $nzcv
Bcc 1, %bb.2, implicit killed $nzcv
B %bb.1
bb.1:
liveins: $x1
$x0 = MOVi64imm -1
STRXui killed $x0, killed $x1, 0
bb.2:
RET_ReallyLR
...
# Don't eliminate redundant MOVi32imm -1 in bb.1: the upper bits are nonzero.
# Note: 64-bit compare/32-bit move imm
# Kill marker should be removed from compare.
# CHECK-LABEL: name: test21
# CHECK: ADDSXri killed $x0, 1, 0, implicit-def $nzcv
# CHECK: bb.1:
# CHECK: MOVi32imm
name: test21
tracksRegLiveness: true
body: |
bb.0.entry:
liveins: $x0, $x1
dead $xzr = ADDSXri killed $x0, 1, 0, implicit-def $nzcv
Bcc 1, %bb.2, implicit killed $nzcv
B %bb.1
bb.1:
liveins: $x1
$w0 = MOVi32imm -1
STRWui killed $w0, killed $x1, 0
bb.2:
RET_ReallyLR
...
# Don't eliminate MOVi64imm -1 in bb.1 as we don't necessarily know the upper 32-bits.
# Note: 32-bit compare/64-bit move imm
# CHECK-LABEL: name: test22
# CHECK: bb.1:
# CHECK: MOVi64imm
name: test22
tracksRegLiveness: true
body: |
bb.0.entry:
liveins: $w0, $x1
dead $wzr = ADDSWri killed $w0, 1, 0, implicit-def $nzcv
Bcc 1, %bb.2, implicit killed $nzcv
B %bb.1
bb.1:
liveins: $x1
$x0 = MOVi64imm -1
STRXui killed $x0, killed $x1, 0
bb.2:
RET_ReallyLR
...
# Eliminate redundant MOVi32imm 4096 in bb.1 when the compare has a shifted immediate.
# CHECK-LABEL: name: test23
# CHECK: bb.1:
# CHECK-NOT: MOVi32imm
name: test23
tracksRegLiveness: true
body: |
bb.0.entry:
liveins: $w0, $x1
dead $wzr = SUBSWri killed $w0, 1, 12, implicit-def $nzcv
Bcc 1, %bb.2, implicit killed $nzcv
B %bb.1
bb.1:
liveins: $x1
$w0 = MOVi32imm 4096
STRWui killed $w0, killed $x1, 0
bb.2:
RET_ReallyLR