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Date: Mon, 01 Feb 2016 16:36:38 -0800 From: Eric Dumazet <eric.dumazet@...il.com> To: Rasmus Villemoes <linux@...musvillemoes.dk> Cc: Andi Kleen <ak@...ux.intel.com>, Andi Kleen <andi@...stfloor.org>, akpm@...ux-foundation.org, linux-kernel@...r.kernel.org, davidlohr.bueso@...com, rafael.j.wysocki@...el.com, lenb@...nel.org Subject: Re: [PATCH] Optimize int_sqrt for small values for faster idle On Tue, 2016-02-02 at 00:08 +0100, Rasmus Villemoes wrote: > Thanks. (Is there a good way to tell gcc that avg*avg is actually a > 32x32->64 multiplication?) If avg is 32bit, compiler does that for you. u32 avg = ... u64 result = (u64)avg * avg;
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