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When coalescing a small register into a subregister of a larger register, if the larger register is rematerialized, the function updateRegDefUses can add an <undef> flag to the rematerialized definition (since it's treating it as only definining the coalesced subregister). While with that assumption doing so is not incorrect, make sure to remove the flag later on after the call to updateRegDefUses. llvm-svn: 334845
38 lines
1.1 KiB
YAML
38 lines
1.1 KiB
YAML
# RUN: llc -march=hexagon -run-pass=simple-register-coalescing -o - %s | FileCheck %s
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# Make sure that the coalescer does not create a full definition with
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# an undef flag on the destination. This used to happen when rematerializing
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# a double register and coalescing a smaller reg into a subreg of it.
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# CHECK-NOT: undef %[0-9]+:doubleregs = A2_tfrpi 1
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---
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name: fred
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tracksRegLiveness: true
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body: |
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bb.0:
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successors: %bb.1(0x80000000); %bb.1(200.00%)
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%18:doubleregs = A2_tfrpi 1
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%23:intregs = IMPLICIT_DEF
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%24:doubleregs = IMPLICIT_DEF
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bb.1:
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successors: %bb.1(0x80000000); %bb.1(200.00%)
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%1:doubleregs = COPY %24:doubleregs
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%0:intregs = COPY %23:intregs
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%13:intregs = COPY %18.isub_lo:doubleregs
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%13:intregs = S2_asl_i_r_or %13:intregs, %0:intregs, 1
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%15:intregs = S2_extractu %0:intregs, 1, 31
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undef %17.isub_lo:doubleregs = COPY %13:intregs
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%17.isub_hi:doubleregs = COPY %15:intregs
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%2:doubleregs = A2_addp %17:doubleregs, %1:doubleregs
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%3:intregs = A2_addi %0:intregs, -1
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%23:intregs = COPY %3:intregs
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%24:doubleregs = COPY %2:doubleregs
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J2_jump %bb.1, implicit-def dead $pc
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...
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