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Re: Question about the highly optimized aspects of libc implementation

From: Florian Weimer <fweimer at redhat dot com>
To: Siddhesh Poyarekar <siddhesh dot poyarekar at gmail dot com>, Will Hawkins <whh8b at virginia dot edu>
Cc: libc-help <libc-help at sourceware dot org>
Date: Thu, 30 Nov 2017 09:22:05 +0100
Subject: Re: Question about the highly optimized aspects of libc implementation
Authentication-results: sourceware.org; auth=none
References: <CAE+MWFsT5vu4yW0zDKgyinZky=2s-i2wzK7N-fnKuQP0kGQ_Bw@mail.gmail.com> <CAAHN_R3ZZxLFeeT5JwtF6wVX6pOSXOYiwUatxkqr-xgDsE5x2Q@mail.gmail.com>

On 11/30/2017 07:54 AM, Siddhesh Poyarekar wrote:

A lot of the internal function calls in i686 use registers to pass
arguments instead of the standard ABI that mandates using the stack.

We remove internal_function, so this no longer happens acrosstranslation units. (GCC will still perform the same optimization withina translation unit, but that is permitted under the as-if rule.)


Thanks,
Florian

References:
- Question about the highly optimized aspects of libc implementation
  - From: Will Hawkins
- Re: Question about the highly optimized aspects of libc implementation
  - From: Siddhesh Poyarekar

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