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537f364e9a
While we can usually replace bitcast like instructions (MachineInstr::isBitcast()) with a COPY this is not legal if any of the users uses SUBREG_TO_REG to assert the upper bits of the result are zero. Differential Revision: https://reviews.llvm.org/D28474 llvm-svn: 291483
41 lines
963 B
YAML
41 lines
963 B
YAML
# RUN: llc -mtriple=x86_64-- -run-pass=peephole-opt %s -o - | FileCheck %s
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--- |
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define void @func() { ret void }
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...
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---
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# Check that instructions with MI.isBitcast() are only replaced by COPY if there
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# are no SUBREG_TO_REG users.
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# CHECK-LABEL: name: func
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name: func
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registers:
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- { id: 0, class: gr32 }
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- { id: 1, class: fr32 }
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- { id: 2, class: gr32 }
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- { id: 3, class: gr32 }
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- { id: 4, class: fr32 }
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- { id: 5, class: gr32 }
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- { id: 6, class: gr64 }
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body: |
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bb.0:
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; CHECK: %1 = VMOVDI2SSrr %0
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; CHECK: %7 = COPY %0
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; CHECK: NOOP implicit %7
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%0 = MOV32ri 42
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%1 = VMOVDI2SSrr %0
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%2 = MOVSS2DIrr %1
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NOOP implicit %2
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; CHECK: %4 = VMOVDI2SSrr %3
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; CHECK-NOT: COPY
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; CHECK: %5 = MOVSS2DIrr %4
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; CHECK: %6 = SUBREG_TO_REG %5, 0
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; CHECK: NOOP implicit %6
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%3 = MOV32ri 42
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%4 = VMOVDI2SSrr %3
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%5 = MOVSS2DIrr %4
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%6 = SUBREG_TO_REG %5, 0, %subreg.sub_32bit
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NOOP implicit %6
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...
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