From 098868b338e9afd3ef844070a94b9b10360d913f Mon Sep 17 00:00:00 2001 From: Szabolcs Nagy Date: Sun, 22 Oct 2017 17:39:36 +0000 Subject: math: new log2f from https://github.com/ARM-software/optimized-routines, commit 04884bd04eac4b251da4026900010ea7d8850edc code size change: +177 bytes. benchmark on x86_64 before, after, speedup: -Os: log2f rthruput: 11.38 ns/call 5.99 ns/call 1.9x log2f latency: 35.01 ns/call 22.57 ns/call 1.55x -O3: log2f rthruput: 10.82 ns/call 5.58 ns/call 1.94x log2f latency: 35.13 ns/call 21.04 ns/call 1.67x --- src/math/log2f_data.c | 33 +++++++++++++++++++++++++++++++++ 1 file changed, 33 insertions(+) create mode 100644 src/math/log2f_data.c (limited to 'src/math/log2f_data.c') diff --git a/src/math/log2f_data.c b/src/math/log2f_data.c new file mode 100644 index 00000000..24e450f1 --- /dev/null +++ b/src/math/log2f_data.c @@ -0,0 +1,33 @@ +/* + * Data definition for log2f. + * + * Copyright (c) 2017-2018, Arm Limited. + * SPDX-License-Identifier: MIT + */ + +#include "log2f_data.h" + +const struct log2f_data __log2f_data = { + .tab = { + { 0x1.661ec79f8f3bep+0, -0x1.efec65b963019p-2 }, + { 0x1.571ed4aaf883dp+0, -0x1.b0b6832d4fca4p-2 }, + { 0x1.49539f0f010bp+0, -0x1.7418b0a1fb77bp-2 }, + { 0x1.3c995b0b80385p+0, -0x1.39de91a6dcf7bp-2 }, + { 0x1.30d190c8864a5p+0, -0x1.01d9bf3f2b631p-2 }, + { 0x1.25e227b0b8eap+0, -0x1.97c1d1b3b7afp-3 }, + { 0x1.1bb4a4a1a343fp+0, -0x1.2f9e393af3c9fp-3 }, + { 0x1.12358f08ae5bap+0, -0x1.960cbbf788d5cp-4 }, + { 0x1.0953f419900a7p+0, -0x1.a6f9db6475fcep-5 }, + { 0x1p+0, 0x0p+0 }, + { 0x1.e608cfd9a47acp-1, 0x1.338ca9f24f53dp-4 }, + { 0x1.ca4b31f026aap-1, 0x1.476a9543891bap-3 }, + { 0x1.b2036576afce6p-1, 0x1.e840b4ac4e4d2p-3 }, + { 0x1.9c2d163a1aa2dp-1, 0x1.40645f0c6651cp-2 }, + { 0x1.886e6037841edp-1, 0x1.88e9c2c1b9ff8p-2 }, + { 0x1.767dcf5534862p-1, 0x1.ce0a44eb17bccp-2 }, + }, + .poly = { + -0x1.712b6f70a7e4dp-2, 0x1.ecabf496832ep-2, -0x1.715479ffae3dep-1, + 0x1.715475f35c8b8p0, + } +}; -- cgit v1.2.1