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Re: [PATCH v4] faster strlen on x64

From: Richard Henderson <rth at twiddle dot net>
To: Andreas Jaeger <aj at suse dot com>
Cc: OndÅej BÃlka <neleai at seznam dot cz>, libc-alpha at sourceware dot org
Date: Wed, 06 Mar 2013 14:25:24 -0800
Subject: Re: [PATCH v4] faster strlen on x64
References: <20130213113840.GA7781@domone.kolej.mff.cuni.cz> <5137BB03.7020206@suse.com>

On 2013-03-06 13:54, Andreas Jaeger wrote:

+/* Used in linker - use only %xmm8-%xmm15. */


Better expand
Say explictely - if it's true: This is used inside the dynamic linker during
relocation, thus we cannot touch the usual registers. We can use %xmm8 to %xmm15.

I did already object to using *any* xmm registers in the dynamic linker.

I know for a fact that Intel has a __regcall calling convention in place that uses all 16 xmm registers for parameter passing.

r~

Follow-Ups:
- Re: [PATCH v4] faster strlen on x64
  - From: OndÅej BÃlka

References:
- Re: [PATCH v4] faster strlen on x64
  - From: Andreas Jaeger

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