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lstm: Use MS C intrinsic function for faster calculation of log2 (#1369)

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Signed-off-by: Stefan Weil <sw@weilnetz.de>
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Stefan Weil 2018-03-10 20:52:39 +01:00 committed by zdenop
parent 960007e58e
commit 14ee911978
1 changed files with 8 additions and 0 deletions
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8
lstm/lstm.cpp
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@ -24,6 +24,10 @@
#include <stdio.h>
#include <stdlib.h>
#if !defined(__GNUC__) && defined(_MSC_VER)
#include <intrin.h> // _BitScanReverse
#endif
#include "fullyconnected.h"
#include "functions.h"
#include "networkscratch.h"
@ -74,6 +78,10 @@ static inline uint32_t ceil_log2(uint32_t n)
#if defined(__GNUC__)
// Use fast inline assembler code for gcc or clang.
uint32_t l2 = 31 - __builtin_clz(n);
#elif defined(_MSC_VER)
// Use fast intrinsic function for MS compiler.
unsigned long l2 = 0;
_BitScanReverse(&l2, n);
#else
if (n == 0) return UINT_MAX;
if (n == 1) return 0;