diff options
Diffstat (limited to 'libs/pbd3/pbd/fastlog.h')
| -rw-r--r-- | libs/pbd3/pbd/fastlog.h | 40 |
1 files changed, 0 insertions, 40 deletions
diff --git a/libs/pbd3/pbd/fastlog.h b/libs/pbd3/pbd/fastlog.h deleted file mode 100644 index 4269705a44..0000000000 --- a/libs/pbd3/pbd/fastlog.h +++ /dev/null @@ -1,40 +0,0 @@ -/* Copyright unknown. Code by Laurent de Soras <laurent@ohmforce.com>. - */ - -#ifndef __pbd_fastlog_h__ -#define __pbd_fastlog_h__ - -#include <math.h> /* for HUGE_VAL */ - -static inline float fast_log2 (float val) -{ - /* don't use reinterpret_cast<> because that prevents this - from being used by pure C code (for example, GnomeCanvasItems) - */ - union {float f; int i;} t; - t.f = val; - int * const exp_ptr = &t.i; - int x = *exp_ptr; - const int log_2 = ((x >> 23) & 255) - 128; - x &= ~(255 << 23); - x += 127 << 23; - *exp_ptr = x; - - val = ((-1.0f/3) * t.f + 2) * t.f - 2.0f/3; - - return (val + log_2); -} - -static inline float fast_log (const float val) -{ - return (fast_log2 (val) * 0.69314718f); -} - -static inline float fast_log10 (const float val) -{ - return fast_log2(val) / 3.312500f; -} - -static inline float minus_infinity() { return -HUGE_VAL; } - -#endif /* __pbd_fastlog_h__ */ |