blob: ab4329fdd6db8a544e71f5ab1c220d47d2ddcc87 [file] [log] [blame]
# RUN: llc -march=hexagon -run-pass branch-folder -run-pass if-converter -verify-machineinstrs %s -o - | FileCheck %s
# The hoisting of common instructions from successors could cause registers
# to no longer be live-in in the successor blocks. The liveness was updated
# to include potential new live-in registres, but not to remove registers
# that were no longer live-in.
# This could cause if-converter to generate incorrect code.
# In this testcase, the "r1 = A2_sxth killed r0" was hoisted, and since r0
# was killed, it was no longer live-in in either successor. The if-converter
# then created code, where the first predicated instruction has incorrect
# implicit use of r0:
# %bb.0:
# liveins: %r0
# %r1 = A2_sxth killed %r0 ; hoisted, kills r0
# A2_nop implicit-def %P0
# %r0 = C2_cmoveit %P0, 2, implicit %r0 ; predicated A2_tfrsi
# %r0 = C2_cmoveif killed %P0, 1, implicit %r0 ; predicated A2_tfrsi
# %r0 = A2_add killed %r0, killed %r1
# J2_jumpr %r31, implicit dead %PC
# CHECK: $r1 = A2_sxth killed $r0
# CHECK: $r0 = C2_cmoveit $p0, 2
# CHECK-NOT: implicit-def $r0
# CHECK: $r0 = C2_cmoveif killed $p0, 1, implicit killed $r0
name: fred
tracksRegLiveness: true
body: |
liveins: $r0
successors: %bb.1, %bb.2
A2_nop implicit-def $p0
J2_jumpt killed $p0, %bb.2, implicit-def dead $pc
successors: %bb.3
liveins: $r0
$r1 = A2_sxth killed $r0
$r0 = A2_tfrsi 1
J2_jump %bb.3, implicit-def $pc
successors: %bb.3
liveins: $r0
$r1 = A2_sxth killed $r0
$r0 = A2_tfrsi 2
liveins: $r0, $r1
$r0 = A2_add killed $r0, killed $r1
J2_jumpr $r31, implicit-def dead $pc