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Message-ID: <da78fde983937e7914ad035b8cdbec7e@smtp.hushmail.com>
Date: Mon, 27 Jul 2015 23:23:30 +0200
From: magnum <john.magnum@...hmail.com>
To: john-dev@...ts.openwall.com
Subject: Ambiguous pointer increments
The beignet OpenCL driver complained about oldoffice kernel, "multiple
unsequenced modifications to 'p'" for things like the below:
- for (i = 0; i < 32; i += 2)
- W[i >> 1] = (uint)*p++ | (*p++ << 16U);
I already changed it but I'm curious - no other driver complained.
+ for (i = 0; i < 32; i += 2) {
+ W[i >> 1] = (uint)*p++;
+ W[i >> 1] |= (*p++ << 16U);
+ }
Originally I thought they (the use/increments of p) were guaranteed to
be left-to-right but after this I'm not sure at all. Anyone know for
sure? Alexander Cherepanov perhaps? In case it matters, OpenCL is C99.
magnum
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