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Re: gcc/resource.c mark_target_live_regs Question
- To: Mark Mitchell <mark at codesourcery dot com>
- Subject: Re: gcc/resource.c mark_target_live_regs Question
- From: Richard Henderson <rth at redhat dot com>
- Date: Thu, 15 Feb 2001 20:12:14 -0800
- Cc: law at redhat dot com, kenner at vlsi1 dot ultra dot nyu dot edu, gcc at gcc dot gnu dot org
- References: <2022.982209415@slagheap.cygnus.com> <20010215094346K.mitchell@codesourcery.com>
On Thu, Feb 15, 2001 at 09:43:46AM -0800, Mark Mitchell wrote:
> We're making some assumption that reorg confuses everything, but not
> across BARRIERs? Is that it?
Exactly.
> mark_target_live_regs mark all registers live if find_basic_block goes
> back, say, more than 1000 instructions ...
50 or 100 is probably a better default. Remember, that
if you have N insns in the block you're still going to
scan N**2/2 insns.
r~