copyprop.mir
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# RUN: llc -mtriple=aarch64-linux-gnu -run-pass machine-cp -o - %s | FileCheck %s
# Tests for MachineCopyPropagation copy forwarding.
---
# Simple forwarding.
# CHECK-LABEL: name: test1
# CHECK: $x0 = SUBXri $x0, 1, 0
name: test1
tracksRegLiveness: true
body: |
bb.0:
liveins: $x0
renamable $x1 = COPY $x0
$x0 = SUBXri renamable $x1, 1, 0
...
---
# Don't forward if not renamable.
# CHECK-LABEL: name: test2
# CHECK: $x0 = SUBXri $x1, 1, 0
name: test2
tracksRegLiveness: true
body: |
bb.0:
liveins: $x0
$x1 = COPY $x0
$x0 = SUBXri $x1, 1, 0
...
---
# Don't forward reserved non-constant reg values.
# CHECK-LABEL: name: test4
# CHECK: $x0 = SUBXri renamable $x1, 1, 0
name: test4
tracksRegLiveness: true
body: |
bb.0:
liveins: $x0
$sp = SUBXri $sp, 16, 0
renamable $x1 = COPY $sp
$x0 = SUBXri renamable $x1, 1, 0
$sp = ADDXri $sp, 16, 0
...
---
# Don't violate opcode constraints when forwarding.
# CHECK-LABEL: name: test5
# CHECK: $x0 = SUBXri renamable $x1, 1, 0
name: test5
tracksRegLiveness: true
body: |
bb.0:
liveins: $x0
renamable $x1 = COPY $xzr
$x0 = SUBXri renamable $x1, 1, 0
...
---
# Test cross-class COPY forwarding.
# CHECK-LABEL: name: test6
# CHECK: $x2 = COPY $x0
name: test6
tracksRegLiveness: true
body: |
bb.0:
liveins: $x0
renamable $d1 = COPY $x0
$x2 = COPY renamable $d1
RET_ReallyLR implicit $x2
...
---
# Don't forward if there are overlapping implicit operands.
# CHECK-LABEL: name: test7
# CHECK: $w0 = SUBWri killed renamable $w1, 1, 0
name: test7
tracksRegLiveness: true
body: |
bb.0:
liveins: $w0
renamable $w1 = COPY $w0
$w0 = SUBWri killed renamable $w1, 1, 0, implicit killed $x1
...
---
# Check that kill flags are cleared.
# CHECK-LABEL: name: test8
# CHECK: $x2 = ADDXri $x0, 1, 0
# CHECK: $x0 = SUBXri $x0, 1, 0
name: test8
tracksRegLiveness: true
body: |
bb.0:
liveins: $x0
renamable $x1 = COPY $x0
$x2 = ADDXri killed $x0, 1, 0
$x0 = SUBXri renamable $x1, 1, 0
...
---
# Don't forward if value is clobbered.
# CHECK-LABEL: name: test9
# CHECK: $x2 = SUBXri renamable $x1, 1, 0
name: test9
tracksRegLiveness: true
body: |
bb.0:
liveins: $x0
renamable $x1 = COPY $x0
$x0 = ADDXri $x0, 1, 0
$x2 = SUBXri renamable $x1, 1, 0
...