> In regmove.c there is function "replace_in_call_usage" called in > fixup_match_1, > It replaces dst register by src in call_insn, I suspect whether it is > necessary Since comment of CALL_INSN_FUNCTION_USAGE says that no pseudo > register can appear in it and seems src is pseudo register. > > further more, no replace(dst->src) is done when building bootstrap > gcc-4.2.4, which confirmed my understanding.
That sounds plausible. Note that this routine (as well as a few others) has been removed in GCC 4.4 because of the new register allocator. -- Eric Botcazou
