e2a071ece5
When passing an instruction with a register mask, the machine copy propagation pass was dropping the information about some copy instructions which define a register which is preserved by the mask, because that register overlaps a register which is partially clobbered by it. This resulted in a miscompilation for AArch64, because this caused a live copy to be considered dead. The fix is to clobber register masks by finding the set of reg units which is preserved by the mask, and clobbering all units not in that set.
58 KiB
58 KiB