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fixed-point: using TI intrinsic for celt_ilog2() if available.

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This commit is contained in:
Jean-Marc Valin 2008-03-21 10:40:43 +11:00
parent 983f6387e0
commit 83006eec60
2 changed files with 6 additions and 0 deletions
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3
libcelt/fixed_c5x.h
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@ -59,4 +59,7 @@
#undef MULT_16_16
#define MULT_16_16(a,b) _lmpy(a,b)
#define celt_ilog2(x) (30 - _lnorm(x))
#define OVERRIDE_CELT_ILOG2
#endif /* FIXED_C5X_H */

3
libcelt/mathops.h
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@ -55,12 +55,15 @@
#include "entcode.h"
#include "os_support.h"
#ifndef OVERRIDE_CELT_ILOG2
/** Integer log in base2. Undefined for zero and negative numbers */
static inline celt_int16_t celt_ilog2(celt_word32_t x)
{
celt_assert2(x>0, "celt_ilog2() only defined for strictly positive numbers");
return EC_ILOG(x)-1;
}
#endif
/** Integer log in base2. Defined for zero, but not for negative numbers */
static inline celt_int16_t celt_zlog2(celt_word32_t x)