1f5e9a3502
In this example: ``` $d14 = COPY killed $d18 $s0 = MI $s28 ``` $s28 is a sub-register of $d14. However, $d18 does not have sub-registers and thus cannot be forwarded. Previously, this resulted in $noreg being substituted in place of the use of $s28, which later led to an assertion failure. Fixes https://github.com/llvm/llvm-project/issues/60908, a regression that was introduced in D141747. Reviewed By: arsenm Differential Revision: https://reviews.llvm.org/D146930
46 lines
1.3 KiB
YAML
46 lines
1.3 KiB
YAML
# NOTE: Assertions have been autogenerated by utils/update_mir_test_checks.py UTC_ARGS: --version 2
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# RUN: llc -mtriple=armv7 -run-pass=machine-cp %s -o - | FileCheck %s
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# Positive test: $d15 has sub-register $s30, which should be propagated.
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---
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name: test_d15
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tracksRegLiveness: true
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liveins:
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- { reg: '$d15' }
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body: |
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bb.0.entry:
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liveins: $d15
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; CHECK-LABEL: name: test_d15
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; CHECK: liveins: $d15
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; CHECK-NEXT: {{ $}}
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; CHECK-NEXT: $s0 = COPY $s30
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; CHECK-NEXT: BX_RET 14 /* CC::al */, $noreg, implicit killed $s0
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renamable $d14 = COPY killed $d15
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$s0 = COPY killed renamable $s28
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BX_RET 14 /* CC::al */, $noreg, implicit killed $s0
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...
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# Negative test: $d18 does not have sub-registers.
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---
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name: test_d18
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tracksRegLiveness: true
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liveins:
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- { reg: '$d18' }
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body: |
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bb.0.entry:
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liveins: $d18
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; CHECK-LABEL: name: test_d18
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; CHECK: liveins: $d18
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; CHECK-NEXT: {{ $}}
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; CHECK-NEXT: renamable $d14 = COPY killed $d18
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; CHECK-NEXT: $s0 = COPY killed renamable $s28
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; CHECK-NEXT: BX_RET 14 /* CC::al */, $noreg, implicit killed $s0
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renamable $d14 = COPY killed $d18
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$s0 = COPY killed renamable $s28
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BX_RET 14 /* CC::al */, $noreg, implicit killed $s0
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...
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