Messages in this thread | | | Date | Fri, 30 May 2003 02:00:40 -0700 (PDT) | Subject | Re: Algoritmic Complexity Attacks and 2.4.20 the dcache code | From | "David S. Miller" <> |
| |
From: Alex Riesen <alexander.riesen@synopsys.COM> Date: Fri, 30 May 2003 10:59:01 +0200
static int hash_3(int hi, int c) { return (hi + (c << 4) + (c >> 4)) * 11; } gcc-3.2.1 -O2 -march=pentium ... It is not guaranteed to be this way on all architectures, of course. But still - no multiplications.
Indeed, I'd missed this. GCC will emit the constant multiply expansion unless the multiply cost is set VERY low. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
| |