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Re: [RFC] Avoiding _divsi3 call during ld.so bootstrap

From: Bob Wilson <bwilson at tensilica dot com>
To: Richard Henderson <rth at twiddle dot net>
Cc: libc-alpha at sourceware dot org, Chris Zankel <czankel at tensilica dot com>
Date: Fri, 06 Apr 2007 12:24:38 -0700
Subject: Re: [RFC] Avoiding _divsi3 call during ld.so bootstrap
References: <1234A53C-F77D-41AD-A7F1-8527DF99E3BA@tensilica.com> <20070405023556.GB29766@twiddle.net>

Richard Henderson wrote:

On Wed, Apr 04, 2007 at 12:18:22PM -0700, Bob Wilson wrote:
The following line in elf_dynamic_do_rel in elf/do-rel.h is generating a call to _divsi3:

r = r + MIN (nrelative, relsize / sizeof (ElfW(Rel)));
Do you not have a umulsi3_highpart insn?  The compiler should
be able to convert this away from a real divide operation...

It depends. There is a processor configuration option to support that, but not all Xtensa processors will have it. Thanks for the suggestion anyway.

In the unlikely event that anyone has further comments, please follow-up on libc-ports, so we don't annoy Ulrich with any more of this "embedded crap".

--Bob

References:
- [RFC] Avoiding _divsi3 call during ld.so bootstrap
  - From: Bob Wilson
- Re: [RFC] Avoiding _divsi3 call during ld.so bootstrap
  - From: Richard Henderson

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