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# NOTE: Assertions have been autogenerated by utils/update_mir_test_checks.py
# RUN: llc -march=amdgcn -mcpu=gfx803 -run-pass register-coalescer -verify-machineinstrs -o - %s | FileCheck %s
# Register coalescer is going to eliminate %2:sgpr_32 = COPY %1.sub0 from bb.1
# by joining %2 and %1.sub0 into %0.sub0 register. Check that when this happen
# the implicit intialization of %0.sub0 in the bb.2 have undef flag
# for the MIR to be valid.
---
name: coalescing_makes_lane_undefined
tracksRegLiveness: true
body: |
; CHECK-LABEL: name: coalescing_makes_lane_undefined
; CHECK: bb.0:
; CHECK-NEXT: successors: %bb.1(0x40000000), %bb.2(0x40000000)
; CHECK-NEXT: {{ $}}
; CHECK-NEXT: S_CBRANCH_SCC0 %bb.2, implicit undef $scc
; CHECK-NEXT: {{ $}}
; CHECK-NEXT: bb.1:
; CHECK-NEXT: successors: %bb.3(0x80000000)
; CHECK-NEXT: {{ $}}
; CHECK-NEXT: undef %0.sub0:sgpr_64 = S_MOV_B32 1
; CHECK-NEXT: %0.sub1:sgpr_64 = S_MOV_B32 2
; CHECK-NEXT: S_BRANCH %bb.3
; CHECK-NEXT: {{ $}}
; CHECK-NEXT: bb.2:
; CHECK-NEXT: successors: %bb.3(0x80000000)
; CHECK-NEXT: {{ $}}
; CHECK-NEXT: undef %0.sub0:sgpr_64 = IMPLICIT_DEF
; CHECK-NEXT: {{ $}}
; CHECK-NEXT: bb.3:
; CHECK-NEXT: S_NOP 0, implicit %0.sub0
; CHECK-NEXT: S_NOP 0, implicit %0
bb.0:
successors: %bb.1, %bb.2
S_CBRANCH_SCC0 %bb.2, implicit undef $scc
bb.1:
successors: %bb.3
undef %1.sub0:sgpr_64 = S_MOV_B32 1
%1.sub1:sgpr_64 = S_MOV_B32 2
%2:sgpr_32 = COPY %1.sub0 ; copy to be joined
S_BRANCH %bb.3
bb.2:
successors: %bb.3
%2:sgpr_32 = IMPLICIT_DEF
undef %1.sub0:sgpr_64 = IMPLICIT_DEF
%1.sub1:sgpr_64 = IMPLICIT_DEF
bb.3:
S_NOP 0, implicit killed %2
S_NOP 0, implicit killed %1
...
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