da9ed3dc71
When expanding pseudo insts, in order to create a new machine instr, we use BuildMI,
which will add implicit operands by default. And transferImpOps will also copy implicit
operands from old ones. Finally, duplicate implicit operands are added to the same inst.
Sometimes this can cause correctness issues. Like below inst,
renamable $w18 = nsw SUBSWrr renamable $w30, renamable $w14, implicit-def dead $nzcv
After expanding, it will become
$w18 = SUBSWrs renamable $w13, renamable $w14, 0, implicit-def $nzcv, implicit-def dead $nzcv
A redundant implicit-def $nzcv is added, but the dead flag is missing.
Reviewed By: dmgreen
Differential Revision: https://reviews.llvm.org/D109069
22 lines
677 B
YAML
22 lines
677 B
YAML
# RUN: llc -run-pass=aarch64-expand-pseudo -mtriple=aarch64-unknown-linux-gnu -o - %s | FileCheck %s
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---
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# CHECK-LABEL: name: test
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# CHECK-LABEL: bb.0:
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# CHECK: $w5 = SUBSWrs renamable $w3, renamable $w2, 0, implicit-def dead $nzcv
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# CHECK-NEXT: $w6 = SUBSWrs renamable $w5, renamable $w3, 0, implicit-def $nzcv
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# CHECK-NEXT: RET undef $lr
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#
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name: test
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alignment: 4
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tracksRegLiveness: true
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body: |
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bb.0:
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liveins: $w5, $w6, $x2, $x3
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renamable $w5 = nsw SUBSWrr renamable $w3, renamable $w2, implicit-def dead $nzcv
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renamable $w6 = nsw SUBSWrr renamable $w5, renamable $w3, implicit-def $nzcv
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RET_ReallyLR
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...
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