Re: [PATCH v2 2/2] powerpc32: optimise csum_partial() loop
From: Segher Boessenkool <hidden>
Date: 2015-08-06 00:32:20
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On Wed, Aug 05, 2015 at 03:29:35PM +0200, Christophe Leroy wrote:
On the 8xx, load latency is 2 cycles and taking branches also takes 2 cycles. So let's unroll the loop.
This is not true for most other 32-bit PowerPC; this patch makes performance worse on e.g. 6xx/7xx/7xxx. Let's not! Segher