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| author | Shawn Landden <shawn@git.icu> | 2019-06-26 10:52:45 -0400 |
|---|---|---|
| committer | Tulio Magno Quites Machado Filho <tuliom@linux.ibm.com> | 2020-02-19 17:29:28 -0300 |
| commit | 01d11f7eb989fe95c635fe3fcf76f68985faa9e0 (patch) | |
| tree | 37d54d1b00e3ec7a9bb4f6502cfead07be36b2af /stdlib/srand48.c | |
| parent | 4068846e1e364b2441b93cf3d731a6599596726a (diff) | |
| download | glibc-01d11f7eb989fe95c635fe3fcf76f68985faa9e0.tar.gz glibc-01d11f7eb989fe95c635fe3fcf76f68985faa9e0.tar.xz glibc-01d11f7eb989fe95c635fe3fcf76f68985faa9e0.zip | |
PPC64: Add libmvec SIMD double-precision power function [BZ #24210]
Based off the ./sysdeps/ieee754/dbl-64/pow.c implementation, and provides identical results. Unlike other libmvec functions, this sets the underflow and overflow bits. The caller can check these flags, and possibly re-run the calculations with scalar pow to figure out what is causing the overflow or underflow. I may have not normalized the data for benchmarking this properly, but operating only on integers between 0-2^32 and floats between 0.5 and 1 I get the following: Running 20 times over 32MiB vector: mean 535.824919 (sd 0.246088) scalar: mean 286.384220 (sd 0.027630) Which is a very impressive speed boost. Reviewed-by: Tulio Magno Quites Machado Filho <tuliom@linux.ibm.com>
Diffstat (limited to 'stdlib/srand48.c')
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