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c92129c0c0
A DBG_VALUE between a two-address instruction and a following COPY would prevent rescheduleMIBelowKill optimization inside TwoAddressInstructionPass. Differential Revision: https://reviews.llvm.org/D55987 llvm-svn: 350289
28 lines
809 B
YAML
28 lines
809 B
YAML
# RUN: llc -run-pass=livevars,twoaddressinstruction -mtriple=x86_64-- -o - %s | FileCheck %s
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---
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name: foo
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tracksRegLiveness: true
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body: |
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bb.0:
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liveins: $edi
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%0:gr32 = COPY killed $edi
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%1:gr32 = COPY killed %0
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%4:gr32 = XOR32ri8 %1, 1, implicit-def dead $eflags
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DBG_VALUE %4
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%5:gr32 = COPY %4
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PUSH32r killed %1, implicit-def $esp, implicit $esp
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$eax = COPY killed %5
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RETQ implicit killed $eax
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...
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# Verify that the DBG_VALUE instruction does not inhibit
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# TwoAddressInstructionPass::rescheduleMIBelowKill optimization
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# CHECK: PUSH32r %1, implicit-def $esp, implicit $esp
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# CHECK-NEXT: %2:gr32 = COPY killed %1
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# CHECK-NEXT: %2:gr32 = XOR32ri8 %2, 1, implicit-def dead $eflags
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# CHECK-NEXT: DBG_VALUE %2
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# CHECK-NEXT: %3:gr32 = COPY killed %2
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