Re: Crypto friendly optimization?

Philipp Klaus Krause <pkk@spth.de>
Sat, 05 Apr 2025 19:50:48 +0200

          From comp.compilers
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Re: Crypto friendly optimization? pkk@spth.de (Philipp Klaus Krause) (2025-04-05)
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From: Philipp Klaus Krause <pkk@spth.de>
Newsgroups: comp.compilers
Date: Sat, 05 Apr 2025 19:50:48 +0200
Organization: Compilers Central
References: 24-08-003 24-08-004 24-08-008
Injection-Info: gal.iecc.com; posting-host="news.iecc.com:2001:470:1f07:1126:0:676f:7373:6970"; logging-data="48796"; mail-complaints-to="abuse@iecc.com"
Keywords: optimize
Posted-Date: 05 Apr 2025 14:20:06 EDT
In-Reply-To: 24-08-008

Am 25.08.24 um 18:06 schrieb anton@mips.complang.tuwien.ac.at:
>> I'm not aware of any current implementations that support it.
>
> That's trivial:
>
> void *memset_explicit( void *dest, int ch, size_t count )
> {
> memset(dest, ch, count);
> }


SDCC has had memset_explicit since SDCC 4.2.0 (released 2021), and this
is the implementation:


#include <string.h>


void *memset_explicit (void *s, int c, size_t n)
{
      return(memset(s, c, n));
}


Since SDCC does not have link-time optimization, and the implementation
resides in its own source file by itself, this is sufficient to ensure
that it does not get optimized out.


Philipp

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