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Open Source and information security mailing list archives
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Date: 24 Sep 2012 09:56:14 -0400 From: "George Spelvin" <linux@...izon.com> To: linux@...izon.com, mpn@...gle.com, vda.linux@...glemail.com Cc: hughd@...gle.com, linux-kernel@...r.kernel.org Subject: Re: [PATCH 2/4] lib: vsprintf: Optimize division by 10000 Michal Nazarewicz <mpn@...gle.com> wrote: > Didn't some SPARCs have 32x32->32 multiply? I remember reading some > rant from a GMP developer about how SPARC is broken that way. SPARCv9 only has 64x64->64; there's no 128-bit result version. That cuts large-integer math speed by a factor of 4 (very crude approximation), to the same speed as 32x32->64. SPARCv8 UMUL puts the high half of the 64-bit result into the Y register, and SPARCv7 has a multiply-step instruction (MULScc) which does likewise. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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