Rory Mitchell RAMitchell
RAMitchell
/ avx.R
Last active
November 15, 2018 12:02
— forked from khotilov/avx.R
AVX sigmoid test
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| library(Rcpp) | |
| # set the compiler flags in ~/Documents/.R/Makevars or ~/Documents/.R/Makevars | |
| # by adding the following line to it | |
| # CXXFLAGS=-O3 -Wall -mtune=native -funroll-loops -mavx -mfma | |
| sourceCpp("avx_test.cc") | |
| curve(approximate_sigmoid(x) - 1/(1 + exp(-x)), -12, 12, n = 1000); grid() | |
| # the exp4096 mostly underestimates the exp | |
| curve(log(exp4096(x)) - x, -9, 9, n = 1000); grid() |