df2d4bc4cb
Fix the calculation of ReplacedAllUntiedUses when any of the tied defs are early-clobber. The effect of this is to fix the placement of kill flags on an instruction like this (from @f2 in test/CodeGen/SystemZ/asm-18.ll): INLINEASM &"stepb $1, $2" [attdialect], $0:[regdef-ec:GRH32Bit], def early-clobber %3:grh32bit, $1:[reguse tiedto:$0], killed %4:grh32bit(tied-def 3), $2:[reguse:GRH32Bit], %4:grh32bit After TwoAddressInstruction without this patch: %3:grh32bit = COPY killed %4:grh32bit INLINEASM &"stepb $1, $2" [attdialect], $0:[regdef-ec:GRH32Bit], def early-clobber %3:grh32bit, $1:[reguse tiedto:$0], %3:grh32bit(tied-def 3), $2:[reguse:GRH32Bit], %4:grh32bit Note that the COPY kills %4, even though there is a later use of %4 in the INLINEASM. This fails machine verification if you force it to run after TwoAddressInstruction (currently it is disabled for other reasons). After TwoAddressInstruction with this patch: %3:grh32bit = COPY %4:grh32bit INLINEASM &"stepb $1, $2" [attdialect], $0:[regdef-ec:GRH32Bit], def early-clobber %3:grh32bit, $1:[reguse tiedto:$0], %3:grh32bit(tied-def 3), $2:[reguse:GRH32Bit], %4:grh32bit Differential Revision: https://reviews.llvm.org/D110848
37 lines
2.0 KiB
YAML
37 lines
2.0 KiB
YAML
# NOTE: Assertions have been autogenerated by utils/update_mir_test_checks.py
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# RUN: llc -o - %s -verify-machineinstrs -mtriple=s390x-linux-gnu -mcpu=z196 -run-pass=livevars,twoaddressinstruction | FileCheck %s
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# Check that the COPY from [[COPY3]] is not killed because there is a subsequent
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# use of [[COPY3]] in the INLINEASM instruction.
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---
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name: f2
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tracksRegLiveness: true
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body: |
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bb.0:
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liveins: $r2l
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; CHECK-LABEL: name: f2
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; CHECK: liveins: $r2l
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; CHECK-NEXT: {{ $}}
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; CHECK-NEXT: [[COPY:%[0-9]+]]:gr32bit = COPY killed $r2l
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; CHECK-NEXT: [[COPY1:%[0-9]+]]:grh32bit = COPY [[COPY]]
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; CHECK-NEXT: $r2l = COPY [[COPY]]
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; CHECK-NEXT: $r3l = COPY killed [[COPY]]
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; CHECK-NEXT: [[COPY2:%[0-9]+]]:grh32bit = COPY killed [[COPY1]]
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; CHECK-NEXT: INLINEASM &"stepa $1, $2, $3", 0 /* attdialect */, 393226 /* regdef:GRH32Bit */, def [[COPY2]], 2147483657 /* reguse tiedto:$0 */, [[COPY2]](tied-def 3), 9 /* reguse */, killed $r2l, 9 /* reguse */, killed $r3l
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; CHECK-NEXT: [[COPY3:%[0-9]+]]:grh32bit = COPY killed [[COPY2]]
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; CHECK-NEXT: [[COPY4:%[0-9]+]]:grh32bit = COPY [[COPY3]]
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; CHECK-NEXT: INLINEASM &"stepb $1, $2", 0 /* attdialect */, 393227 /* regdef-ec:GRH32Bit */, def early-clobber [[COPY4]], 2147483657 /* reguse tiedto:$0 */, [[COPY4]](tied-def 3), 393225 /* reguse:GRH32Bit */, [[COPY3]]
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; CHECK-NEXT: $r2l = COPY killed [[COPY4]]
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; CHECK-NEXT: Return implicit killed $r2l
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%0:gr32bit = COPY killed $r2l
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%2:grh32bit = COPY %0
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$r2l = COPY %0
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$r3l = COPY killed %0
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INLINEASM &"stepa $1, $2, $3", 0 /* attdialect */, 393226 /* regdef:GRH32Bit */, def %1:grh32bit, 2147483657 /* reguse tiedto:$0 */, killed %2(tied-def 3), 9 /* reguse */, killed $r2l, 9 /* reguse */, killed $r3l
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%4:grh32bit = COPY killed %1
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INLINEASM &"stepb $1, $2", 0 /* attdialect */, 393227 /* regdef-ec:GRH32Bit */, def early-clobber %3:grh32bit, 2147483657 /* reguse tiedto:$0 */, killed %4(tied-def 3), 393225 /* reguse:GRH32Bit */, %4
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$r2l = COPY killed %3
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Return implicit killed $r2l
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...
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