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Normally, if conversion would add implicit uses for redefined registers, e.g. R0<def> = add_if ..., R0<imp-use>. However, if only subregisters of R0 are known to be live but not R0 itself, such implicit uses will not be added, causing prior definitions of such subregisters and R0 itself to become dead. llvm-svn: 282626
51 lines
1.2 KiB
YAML
51 lines
1.2 KiB
YAML
# RUN: llc -march=hexagon -run-pass if-converter -o - %s | FileCheck %s
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# Check that an implicit use is generated for a predicated instruction
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# when a subregister of the redefined register is live.
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# CHECK-LABEL: name: foo
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# Verify the predicated block:
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# CHECK-LABEL: bb.0:
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# CHECK: liveins: %r0, %r1, %p0, %d8
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# CHECK: %d8 = A2_combinew killed %r0, killed %r1
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# CHECK: %d8 = L2_ploadrdf_io %p0, %r29, 0, implicit %d8
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# CHECK: J2_jumprf %p0, killed %r31, implicit-def %pc, implicit-def %pc, implicit killed %d8
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--- |
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define void @foo() {
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ret void
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}
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...
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---
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name: foo
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alignment: 4
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tracksRegLiveness: true
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liveins:
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- { reg: '%r0' }
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- { reg: '%r1' }
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- { reg: '%p0' }
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- { reg: '%d8' }
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body: |
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bb.0:
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successors: %bb.1, %bb.2
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liveins: %r0, %r1, %p0, %d8
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%d8 = A2_combinew killed %r0, killed %r1
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J2_jumpf killed %p0, %bb.2, implicit-def %pc
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bb.1:
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liveins: %d0, %r17
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%r0 = A2_tfrsi 0
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%r1 = A2_tfrsi 0
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A2_nop ; non-predicable
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J2_jumpr killed %r31, implicit-def dead %pc, implicit killed %d0
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bb.2:
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; Predicate this block.
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%d8 = L2_loadrd_io %r29, 0
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J2_jumpr killed %r31, implicit-def dead %pc, implicit killed %d8
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...
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