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8010bdcf94
In MachineCopyPropagation::BackwardPropagatableCopy(),
a check is added for multiple destination registers.
The copy propagation is avoided if the copied destination register
is the same register as another destination on the same instruction.
A new test is added. This used to fail on ARM like this:
error: unpredictable instruction, RdHi and RdLo must be different
umull r9, r9, lr, r0
Reviewed By: lkail
Differential Revision: https://reviews.llvm.org/D82638
14 lines
460 B
YAML
14 lines
460 B
YAML
# RUN: llc -mtriple=arm-eabi -O1 -run-pass=machine-cp %s -o - \
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# RUN: -verify-machineinstrs -simplify-mir | FileCheck %s
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name: h
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body: |
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bb.0:
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dead renamable $r9, renamable $r0 = UMULL renamable $lr, killed renamable $r0, 14 /* CC::al */, $noreg, $noreg
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; CHECK: dead renamable $r9, renamable $r0 = UMULL renamable $lr, killed renamable $r0, 14 /* CC::al */, $noreg, $noreg
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renamable $r9 = COPY killed renamable $r0
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...
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