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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
#
# This is another example of a test giving "Couldn't join subrange!"
#
# This shows a case where a whole reg use point of the whole register was
# undefined in one subreg, but after coalescing it became defined but the
# subrange was not updated to reflect that.
#
---
name: coalescing_makes_lane_defined
tracksRegLiveness: true
body: |
; CHECK-LABEL: name: coalescing_makes_lane_defined
; CHECK: bb.0:
; CHECK-NEXT: successors: %bb.1(0x40000000), %bb.2(0x40000000)
; CHECK-NEXT: {{ $}}
; CHECK-NEXT: undef %4.sub2:sgpr_128 = S_MOV_B32 0
; CHECK-NEXT: dead undef %7.sub0:sgpr_128 = S_MOV_B32 0
; CHECK-NEXT: S_CBRANCH_SCC0 %bb.2, implicit undef $scc
; CHECK-NEXT: {{ $}}
; CHECK-NEXT: bb.1:
; CHECK-NEXT: successors: %bb.2(0x80000000)
; CHECK-NEXT: {{ $}}
; CHECK-NEXT: %4.sub0:sgpr_128 = S_MOV_B32 -1
; CHECK-NEXT: {{ $}}
; CHECK-NEXT: bb.2:
; CHECK-NEXT: S_NOP 0, implicit %4
bb.0:
successors: %bb.1, %bb.2
%0:sreg_32_xm0 = S_MOV_B32 0
undef %1.sub2:sgpr_128 = COPY %0
undef %2.sub0:sgpr_128 = S_MOV_B32 0
undef %3.sub2:sgpr_128 = COPY %0
S_CBRANCH_SCC0 %bb.2, implicit undef $scc
bb.1:
successors: %bb.2
undef %4.sub0:sgpr_128 = S_MOV_B32 -1
%4.sub2:sgpr_128 = COPY killed %0
%5:sgpr_128 = COPY killed %4
%6:sgpr_128 = COPY killed %1
%3:sgpr_128 = COPY killed %6
%2:sgpr_128 = COPY killed %5
bb.2:
S_NOP 0, implicit killed %3
...
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