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[line-map] simple oneliner that speeds up track-macro-expansion

From: Dimitrios Apostolou <jimis at gmx dot net>
To: gcc-patches at gcc dot gnu dot org
Cc: amonakov at gcc dot gnu dot org, abel at gcc dot gnu dot org, dodji at gcc dot gnu dot org, bonzini at gnu dot org
Date: Mon, 4 Jun 2012 08:09:04 +0300 (EEST)
Subject: [line-map] simple oneliner that speeds up track-macro-expansion

Hello list,

the attached simple patch is a small part of the fix in Bug #53525, but it is independant and offers a noticeable performance improvement for track-macro-expansion. No regressions tested on x86, besides memory usage going up some KB.

I don't get why the max_column_hint was zeroed in every macro. Maybe there are pathological cases that I don't see?

2012-06-04 Dimitrios Apostolou <jimis@gmx.net>

	* line-map.c (linemap_enter_macro): Don't zero max_column_hint in
	every macro. This improves performance by reducing the number of
	reallocations when track-macro-expansion is on.


Thanks
Dimitris

Attachment: macro1.diff
Description: Text document

Follow-Ups:
- Re: [line-map] simple oneliner that speeds up track-macro-expansion
  - From: Dodji Seketeli
- Re: [line-map] simple oneliner that speeds up track-macro-expansion
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