daniel tian <[email protected]> writes:
> By the way, I don't underand the start_sequence and end_sequence.
> What does those function mean.
> I checked the source code in emit-rtl.c.
> I still can't figure out what they do.
> There is a structure sequence_stack, I don't what it does.
start_sequence and end_sequence are used to group insns into a
specific location when you are generating insns. I quote the comment
in emit-rtl.c:
For example, consider the instruction named SPOT and the fact that
we would like to emit some instructions before SPOT. We might do
it like this:
start_sequence ();
... emit the new instructions ...
insns_head = get_insns ();
end_sequence ();
emit_insn_before (insns_head, SPOT);
Ian
