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Remove Prefer_SSE_for_memop on x64?

From: OndÅej BÃlka <neleai at seznam dot cz>
To: libc-alpha at sourceware dot org
Date: Mon, 11 Feb 2013 20:44:02 +0100
Subject: Remove Prefer_SSE_for_memop on x64?

Hello, 
when I looked at memset implementation I discovered that also 
non-sse version is present. A switch to sse version uses 
Prefer_SSE_for_memop. It is only function that uses 
Prefer_SSE_for_memop.

As x64 specification requires sse2 support I do not see any 
reason why keep this flag.

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