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2821987cf3
When copying to/from a constant register interferences can be ignored. Also update the documentation for isConstantPhysReg() to make it more obvious that this transformation is valid. Differential Revision: https://reviews.llvm.org/D26106 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@286503 91177308-0d34-0410-b5e6-96231b3b80d8
32 lines
768 B
YAML
32 lines
768 B
YAML
# RUN: llc -mtriple=aarch64-- -run-pass=simple-register-coalescing %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 we eliminate copies to/from constant physregs regardless of
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# "interfering" reads/writes.
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# CHECK: name: func
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# CHECK-NOT: COPY
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# CHECK: STRWui %wzr, %x1
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# CHECK-NOT: COPY
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# CHECK: STRXui %xzr, %x1
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# CHECK: %wzr = SUBSWri %w1, 0, 0
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name: func
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registers:
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- { id: 0, class: gpr32 }
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- { id: 1, class: gpr64 }
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- { id: 2, class: gpr32 }
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body: |
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bb.0:
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%0 = COPY %wzr
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dead %wzr = SUBSWri %w1, 0, 0, implicit-def %nzcv
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STRWui %0, %x1, 0
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%1 = COPY %xzr
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dead %wzr = SUBSWri %w1, 0, 0, implicit-def %nzcv
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STRXui %1, %x1, 0
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%2 = SUBSWri %w1, 0, 0, implicit-def %nzcv
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%wzr = COPY %2
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...
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