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author | Wilco Dijkstra <wdijkstr@arm.com> | 2018-04-03 16:28:03 +0100 |
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committer | Wilco Dijkstra <wdijkstr@arm.com> | 2018-04-03 16:52:17 +0100 |
commit | 7a5640f23a797d3be38a78fb899903699c3aa5a0 (patch) | |
tree | 5d0dc9164a8001312f3211fd88b646399adcc4c7 /sysdeps/generic/stackinfo.h | |
parent | 19a8b9a300f2f1f0012aff0f2b70b09430f50d9e (diff) | |
download | glibc-7a5640f23a797d3be38a78fb899903699c3aa5a0.tar.gz glibc-7a5640f23a797d3be38a78fb899903699c3aa5a0.tar.xz glibc-7a5640f23a797d3be38a78fb899903699c3aa5a0.zip |
[PATCH 2/7] sin/cos slow paths: remove large range reduction
This patch removes the large range reduction code and defers to the huge range reduction code. The first level range reducer supports inputs up to 2^27, which is way too large given that inputs for sin/cos are typically small (< 10), and optimizing for a smaller range would give a significant speedup. Input values above 2^27 are practically never used, so there is no reason for supporting range reduction between 2^27 and 2^48. Removing it significantly simplifies code and enables further speedups. There is about a 2.3x slowdown in this range due to __branred being extremely slow (a better algorithm could easily more than double performance). * sysdeps/ieee754/dbl-64/s_sin.c (reduce_sincos_2): Remove function. (do_sincos_2): Likewise. (__sin): Remove middle range reduction case. (__cos): Likewise. * sysdeps/ieee754/dbl-64/s_sincos.c (__sincos): Remove middle range reduction case.
Diffstat (limited to 'sysdeps/generic/stackinfo.h')
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