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Implementation of strchr for AArch64. Speedups taken from micro-bench show the improvements relative to the standard C code. The use of LD1 means we have identical code for both big- and little-endian systems. A speedup (which is taken as the time to run the reference version divided by the time to run the new version) >1 implies an improvement (<1 a regression). The table only shows one sample that regresses and that's by marginally less than 1%. The geomean for all the samples is 1.58. Measurements are on Cortex-A57. <date> Richard Earnshaw <rearnsha@arm.com> * sysdeps/aarch64/strchr.S: New file. OK? Length Alignment Speedup (Ratio: old/new) 32 0 1.11 32 1 1.44 64 0 1.62 64 2 1.63 128 0 2.21 128 3 2.28 256 0 3.17 256 4 2.71 512 0 3.17 512 5 2.68 1024 0 3.37 1024 6 3.25 2048 0 3.5 2048 7 3.59 64 1 1.7 64 1 1.63 64 2 1.64 64 2 1.62 64 3 1.64 64 3 1.62 64 4 1.63 64 4 1.6 64 5 1.64 64 5 1.6 64 6 1.67 64 6 1.61 64 7 1.59 64 7 1.54 0 0 1.05 0 0 1.05 1 0 1.13 1 0 1.07 2 0 1.09 2 0 1.07 3 0 1.14 3 0 1.11 4 0 1.15 4 0 1.1 5 0 1.14 5 0 1.14 6 0 1.15 6 0 1.14 7 0 1.21 7 0 1.18 8 0 1.26 8 0 1.26 9 0 1.37 9 0 1.25 10 0 1.29 10 0 1.25 11 0 1.34 11 0 1.28 12 0 1.35 12 0 1.29 13 0 1.35 13 0 1.32 14 0 1.37 14 0 1.33 15 0 1.4 15 0 1.35 16 0 1.52 16 0 1.36 17 0 1.49 17 0 1.38 18 0 1.41 18 0 1.39 19 0 1.44 19 0 1.41 20 0 1.47 20 0 1.17 21 0 1.24 21 0 1.57 22 0 1.61 22 0 1.53 23 0 1.65 23 0 1.61 24 0 1.72 24 0 1.7 25 0 1.77 25 0 1.65 26 0 1.74 26 0 1.64 27 0 1.88 27 0 1.68 28 0 1.74 28 0 1.69 29 0 1.88 29 0 1.75 30 0 1.79 30 0 1.74 31 0 1.84 31 0 1.8 32 0 1.56 32 1 1.51 64 0 1.74 64 2 1.81 128 0 2.35 128 3 2.59 256 0 3.22 256 4 2.92 512 0 3.09 512 5 2.8 1024 0 3.52 1024 6 3.28 2048 0 3.61 2048 7 3.5 64 1 1.8 64 1 1.73 64 2 1.74 64 2 1.69 64 3 1.75 64 3 1.72 64 4 1.7 64 4 1.68 64 5 1.71 64 5 1.7 64 6 1.73 64 6 1.69 64 7 1.67 64 7 1.65 0 0 1.04 0 0 0.99 1 0 1.11 1 0 1.08 2 0 1.15 2 0 1.12 3 0 1.16 3 0 1.14 4 0 1.17 4 0 1.15 5 0 1.22 5 0 1.19 6 0 1.22 6 0 1.21 7 0 1.24 7 0 1.23 8 0 1.33 8 0 1.33 9 0 1.37 9 0 1.36 10 0 1.4 10 0 1.34 11 0 1.38 11 0 1.39 12 0 1.45 12 0 1.4 13 0 1.52 13 0 1.44 14 0 1.46 14 0 1.43 15 0 1.49 15 0 1.48 16 0 1.49 16 0 1.47 17 0 1.51 17 0 1.47 18 0 1.54 18 0 1.53 19 0 1.6 19 0 1.56 20 0 1.57 20 0 1.58 21 0 1.68 21 0 1.6 22 0 1.59 22 0 1.57 23 0 1.64 23 0 1.62 24 0 1.64 24 0 1.63 25 0 1.71 25 0 1.68 26 0 1.74 26 0 1.66 27 0 1.72 27 0 1.68 28 0 1.77 28 0 1.7 29 0 1.77 29 0 1.74 30 0 1.79 30 0 1.75 31 0 1.82 31 0 1.8 Best improvement 3.61 Worst regression 0.99 Geomean 1.58
Attachment:
strchr-glibc.patch
Description: Text document
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