derek.holloway
7502bf64a4
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60 lines
1.7 KiB
YAML
60 lines
1.7 KiB
YAML
# RUN: llc -mtriple=hexagon -run-pass branch-folder -run-pass if-converter -verify-machineinstrs %s -o - | FileCheck %s
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# The hoisting of common instructions from successors could cause registers
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# to no longer be live-in in the successor blocks. The liveness was updated
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# to include potential new live-in registres, but not to remove registers
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# that were no longer live-in.
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# This could cause if-converter to generate incorrect code.
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#
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# In this testcase, the "r1 = A2_sxth killed r0" was hoisted, and since r0
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# was killed, it was no longer live-in in either successor. The if-converter
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# then created code, where the first predicated instruction has incorrect
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# implicit use of r0:
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#
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# %bb.0:
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# liveins: %r0
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# %r1 = A2_sxth killed %r0 ; hoisted, kills r0
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# A2_nop implicit-def %P0
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# %r0 = C2_cmoveit %P0, 2, implicit %r0 ; predicated A2_tfrsi
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# %r0 = C2_cmoveif killed %P0, 1, implicit %r0 ; predicated A2_tfrsi
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# %r0 = A2_add killed %r0, killed %r1
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# J2_jumpr %r31, implicit dead %PC
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#
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# CHECK: $r1 = A2_sxth killed $r0
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# CHECK: $r0 = C2_cmoveit $p0, 2
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# CHECK-NOT: implicit-def $r0
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# CHECK: $r0 = C2_cmoveif killed $p0, 1, implicit killed $r0
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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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liveins: $r0
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successors: %bb.1, %bb.2
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A2_nop implicit-def $p0
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J2_jumpt killed $p0, %bb.2, implicit-def dead $pc
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bb.1:
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successors: %bb.3
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liveins: $r0
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$r1 = A2_sxth killed $r0
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$r0 = A2_tfrsi 1
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J2_jump %bb.3, implicit-def $pc
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bb.2:
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successors: %bb.3
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liveins: $r0
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$r1 = A2_sxth killed $r0
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$r0 = A2_tfrsi 2
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bb.3:
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liveins: $r0, $r1
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$r0 = A2_add killed $r0, killed $r1
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J2_jumpr $r31, implicit-def dead $pc
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...
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