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Re: Bootstrap times on mainline are getting worse

From: Geert Bosch <bosch at gnat dot com>
To: Roger Sayle <roger at eyesopen dot com>
Cc: Zack Weinberg <zack at codesourcery dot com>, <gcc at gcc dot gnu dot org>,<gcc-patches at gcc dot gnu dot org>, Diego Novillo <dnovillo at redhat dot com>
Date: Sat, 19 Oct 2002 14:57:52 -0400
Subject: Re: Bootstrap times on mainline are getting worse

Roger wrote:

Also be carefull about changing these RTX costs to unsigned char.
Pentium4 already has integer division costs at around 120, and
improvements in superscalar issue vs memory latency could easily
push values above 256 on x86 within only a year or so.  Just look
at the curves for i386, i486, pentium, pentiumpro, pentium4....

I don't see how it can hurt to max out the cost at some point.
If we select an instruction with a cost higher than 100, it must
mean there is little alternative but to use that instruction.

  -Geert

References:
- Re: Bootstrap times on mainline are getting worse
  - From: Roger Sayle

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