456886 – sse4_1 and sse41 USE flags should be converged

Bug 456886 - sse4_1 and sse41 USE flags should be converged

Summary: sse4_1 and sse41 USE flags should be converged

Status:	RESOLVED FIXED

Alias:	None

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

Importance:	Normal trivial (vote)
Assignee:	Christoph Junghans (RETIRED)

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Depends on:
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Reported:	2013-02-12 02:29 UTC by kfm
Modified:	2013-02-12 05:04 UTC (History)
CC List:	2 users (show)

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Runtime testing required:	---

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Description kfm 2013-02-12 02:29:20 UTC

Having both "sse4_1" and "sse41" flags to target SSE 4.1 (a subset of SSE4) is unnecessary. Please consider dropping one in favour of the other.

$ grep -h 'sse4.*' /usr/portage/profiles/use.*
media-libs/freeverb3:sse4 - Enable SSE4 support
media-libs/libvpx:sse4_1 - Enable optimization for SSE4_1 capable processors (Intel Core 2 Penryn and later chips)
net-misc/bfgminer:sse4 - Enable support for CPU SSE4 mining algorithm
net-misc/cgminer:sse4 - Enable support for CPU SSE4 mining algorithm
sci-chemistry/gromacs:sse41 - Enable sse4.1 acceleration

Comment 1 Christoph Junghans (RETIRED) gentoo-dev

2013-02-12 04:02:56 UTC

I guess sse4_1 as in /proc/cpuinfo is more logical.

However, is sse4 = sse4_1 + sse4_2 ?

Comment 2 kfm 2013-02-12 05:04:59 UTC

Yes, SSE 4 encompasses both SSE 4.1 and SSE 4.2. SSE 4.1 was introduced in Penryn, whereas SSE 4.2 was introduced in Nehalem, thus constituting the complete SSE 4 instruction set.