https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101325
--- Comment #5 from Christophe Lyon <clyon at gcc dot gnu.org> ---
Before the patch, combine says:
allowing combination of insns 8 and 14
original costs 4 + 2 = 6
replacement cost 4
deferring deletion of insn with uid = 8.
modifying insn i3 14: r0:SI=zero_extend(r117:HI)
REG_DEAD r117:HI
deferring rescan insn with uid = 14.
starting the processing of deferred insns
rescanning insn with uid = 7.
rescanning insn with uid = 14.
ending the processing of deferred insns
After the patch:
allowing combination of insns 8 and 14
original costs 4 + 2 = 6
replacement cost 4
deferring deletion of insn with uid = 8.
modifying insn i3 14: r0:SI=r117:HI#0&0x1
REG_DEAD r117:HI
deferring rescan insn with uid = 14.
starting the processing of deferred insns
rescanning insn with uid = 7.
rescanning insn with uid = 14.
ending the processing of deferred insns
