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author | Wilco Dijkstra <wdijkstr@arm.com> | 2017-08-10 17:00:38 +0100 |
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committer | Wilco Dijkstra <wdijkstr@arm.com> | 2017-08-10 17:00:38 +0100 |
commit | 922369032c604b4dcfd535e1bcddd4687e7126a5 (patch) | |
tree | 82779a2afc66f4ef2f2c9006f90a412bffaad23e /iconvdata/bug-iconv10.c | |
parent | 2449ae7b2da24c9940962304a3e44bc80e389265 (diff) | |
download | glibc-922369032c604b4dcfd535e1bcddd4687e7126a5.tar.gz glibc-922369032c604b4dcfd535e1bcddd4687e7126a5.tar.xz glibc-922369032c604b4dcfd535e1bcddd4687e7126a5.zip |
[AArch64] Optimized memcmp.
This is an optimized memcmp for AArch64. This is a complete rewrite using a different algorithm. The previous version split into cases where both inputs were aligned, the inputs were mutually aligned and unaligned using a byte loop. The new version combines all these cases, while small inputs of less than 8 bytes are handled separately. This allows the main code to be sped up using unaligned loads since there are now at least 8 bytes to be compared. After the first 8 bytes, align the first input. This ensures each iteration does at most one unaligned access and mutually aligned inputs behave as aligned. After the main loop, process the last 8 bytes using unaligned accesses. This improves performance of (mutually) aligned cases by 25% and unaligned by >500% (yes >6 times faster) on large inputs. * sysdeps/aarch64/memcmp.S (memcmp): Rewrite of optimized memcmp.
Diffstat (limited to 'iconvdata/bug-iconv10.c')
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