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6af9902543
A register unit may be allocatable and non-reserved but some of the register(tuples) built with it are reserved. We still need to calculate liveness in this case. Note to out of tree targets: If you start seeing machine verifier errors with this commit, it probably means that you do not properly mark super registers of reserved register as reserved. See for example r292836 or r292870 for example on how to fix that. rdar://29996737 Differential Revision: https://reviews.llvm.org/D28881 llvm-svn: 292871
23 lines
806 B
YAML
23 lines
806 B
YAML
# RUN: llc -o /dev/null %s -mtriple=aarch64-darwin-ios -run-pass=liveintervals -debug-only=regalloc -precompute-phys-liveness 2>&1 | FileCheck %s
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# REQUIRES: asserts
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--- |
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define void @reserved_reg_liveness() { ret void }
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...
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---
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# CHECK-LABEL: ********** INTERVALS **********
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# W29 is reserved, so we should only see dead defs
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# CHECK-DAG: W29 [0B,0d:{{[0-9]+}})[32r,32d:{{[0-9]+}})[64r,64d:{{[0-9]+}})
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# For normal registers like x28 we should see the full intervals
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# CHECK-DAG: W28 [0B,16r:{{[0-9]+}})[32r,48r:{{[0-9]+}})[48r,48d:{{[0-9]+}})
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# CHECK: # End machine code for function reserved_reg_liveness.
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name: reserved_reg_liveness
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tracksRegLiveness: true
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body: |
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bb.0:
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liveins: %x28_fp
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%6 : xseqpairsclass = COPY %x28_fp
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%x28_fp = COPY %6
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%x28 = COPY %x28
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%fp = COPY %fp
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...
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