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# RUN: llc -march=hexagon -run-pass=simple-register-coalescing -o - %s | FileCheck %s
# Make sure that the coalescer does not create a full definition with
# an undef flag on the destination. This used to happen when rematerializing
# a double register and coalescing a smaller reg into a subreg of it.
# CHECK-NOT: undef %[0-9]+:doubleregs = A2_tfrpi 1
---
name: fred
tracksRegLiveness: true
body: |
bb.0:
successors: %bb.1(0x80000000); %bb.1(200.00%)
%18:doubleregs = A2_tfrpi 1
%23:intregs = IMPLICIT_DEF
%24:doubleregs = IMPLICIT_DEF
bb.1:
successors: %bb.1(0x80000000); %bb.1(200.00%)
%1:doubleregs = COPY %24:doubleregs
%0:intregs = COPY %23:intregs
%13:intregs = COPY %18.isub_lo:doubleregs
%13:intregs = S2_asl_i_r_or %13:intregs, %0:intregs, 1
%15:intregs = S2_extractu %0:intregs, 1, 31
undef %17.isub_lo:doubleregs = COPY %13:intregs
%17.isub_hi:doubleregs = COPY %15:intregs
%2:doubleregs = A2_addp %17:doubleregs, %1:doubleregs
%3:intregs = A2_addi %0:intregs, -1
%23:intregs = COPY %3:intregs
%24:doubleregs = COPY %2:doubleregs
J2_jump %bb.1, implicit-def dead $pc
...
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