430208 – (PR54077) sys-devel/gcc-4.7.1: integer performance is 30% slower than gcc 4.6

Bug 430208 (PR54077) - sys-devel/gcc-4.7.1: integer performance is 30% slower than gcc 4.6

Summary: sys-devel/gcc-4.7.1: integer performance is 30% slower than gcc 4.6

Status:	RESOLVED UPSTREAM

Alias:	PR54077

Product:	Gentoo Linux
Classification:	Unclassified
Component:	[OLD] Core system (show other bugs)
Hardware:	All Linux

Importance:	Normal normal
Assignee:	Gentoo Toolchain Maintainers

URL:	http://gcc.gnu.org/PR54077
Whiteboard:
Keywords:	REGRESSION

Depends on:
Blocks:

Reported:	2012-08-06 18:01 UTC by wbrana
Modified:	2012-09-29 06:08 UTC (History)
CC List:	0 users

See Also:	http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54077
Package list:
Runtime testing required:	---

Attachments
reverse patch which restores performance (gcc-4.7-nbench-fpemu.patch,480 bytes, patch) 2012-08-06 18:01 UTC, wbrana	Details \| Diff
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Description wbrana 2012-08-06 18:01:19 UTC

Created attachment 320576 [details, diff]
reverse patch which restores performance

gcc 4.7 is 30% slower than 4.6 in Bytemark FP EMU
upstream bug http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54077

Comment 1 SpanKY gentoo-dev

2012-08-06 22:23:53 UTC

we'll wait to see what upstream merges before adding it to our patchset

Comment 2 wbrana 2012-08-06 22:27:53 UTC

floating point emulation using integer is slower not floating point