1 # RUN: llc -march=hexagon -run-pass=simple-register-coalescing -o - %s | FileCheck %s
3 # Make sure that the coalescer does not create a full definition with
4 # an undef flag on the destination. This used to happen when rematerializing
5 # a double register and coalescing a smaller reg into a subreg of it.
7 # CHECK-NOT: undef %[0-9]+:doubleregs = A2_tfrpi 1
11 tracksRegLiveness: true
15 successors: %bb.1(0x80000000); %bb.1(200.00%)
17 %18:doubleregs = A2_tfrpi 1
18 %23:intregs = IMPLICIT_DEF
19 %24:doubleregs = IMPLICIT_DEF
22 successors: %bb.1(0x80000000); %bb.1(200.00%)
24 %1:doubleregs = COPY %24:doubleregs
25 %0:intregs = COPY %23:intregs
26 %13:intregs = COPY %18.isub_lo:doubleregs
27 %13:intregs = S2_asl_i_r_or %13:intregs, %0:intregs, 1
28 %15:intregs = S2_extractu %0:intregs, 1, 31
29 undef %17.isub_lo:doubleregs = COPY %13:intregs
30 %17.isub_hi:doubleregs = COPY %15:intregs
31 %2:doubleregs = A2_addp %17:doubleregs, %1:doubleregs
32 %3:intregs = A2_addi %0:intregs, -1
33 %23:intregs = COPY %3:intregs
34 %24:doubleregs = COPY %2:doubleregs
35 J2_jump %bb.1, implicit-def dead $pc