Add prefetching on strings before hashing #104
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Turns out that the hotspots of nasm are mainly on string hashing when accessing memory. A simple performance improvement is to prefetch the first cacheline of a string to be hashed. Ran 50 tests on an i9-12900 building intel-ipsec-mb that heavily uses nasm and improved wall clock build times from 56.1 seconds to 53.2 seconds or around 5% speed improvement. Signed-off-by: Colin Ian King <[email protected]>
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Turns out that the hotspots of nasm are mainly on string hashing when accessing memory. A simple performance improvement is to prefetch the first cacheline of a string to be hashed. Ran 50 tests on an i9-12900 building intel-ipsec-mb that heavily uses nasm and improved wall clock build times from 56.1 seconds to 53.2 seconds or around 5% speed improvement.