diff options
Diffstat (limited to 'stmhal/math.c')
| -rw-r--r-- | stmhal/math.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/stmhal/math.c b/stmhal/math.c index 91ffb2503f..9f0d312488 100644 --- a/stmhal/math.c +++ b/stmhal/math.c @@ -102,6 +102,10 @@ float copysignf(float x, float y) { #ifdef log2f #undef log2f #endif +// some compilers have _M_LN2 defined in math.h, some don't +#ifndef _M_LN2 +#define _M_LN2 (0.69314718055994530942) +#endif float log2f(float x) { return logf(x) / (float)_M_LN2; } static const float _M_LN10 = 2.30258509299404; // 0x40135d8e |