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# 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:
# Live Ins: %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: |
bb.0:
liveins: %r0
successors: %bb.1, %bb.2
A2_nop implicit-def %p0
J2_jumpt killed %p0, %bb.2, implicit-def dead %pc
bb.1:
successors: %bb.3
liveins: %r0
%r1 = A2_sxth killed %r0
%r0 = A2_tfrsi 1
J2_jump %bb.3, implicit-def %pc
bb.2:
successors: %bb.3
liveins: %r0
%r1 = A2_sxth killed %r0
%r0 = A2_tfrsi 2
bb.3:
liveins: %r0, %r1
%r0 = A2_add killed %r0, killed %r1
J2_jumpr %r31, implicit-def dead %pc
...
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