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-/***********************************************************************
-Copyright (c) 2006-2011, Skype Limited. All rights reserved.
-Redistribution and use in source and binary forms, with or without
-modification, are permitted provided that the following conditions
-are met:
-- Redistributions of source code must retain the above copyright notice,
-this list of conditions and the following disclaimer.
-- Redistributions in binary form must reproduce the above copyright
-notice, this list of conditions and the following disclaimer in the
-documentation and/or other materials provided with the distribution.
-- Neither the name of Internet Society, IETF or IETF Trust, nor the
-names of specific contributors, may be used to endorse or promote
-products derived from this software without specific prior written
-permission.
-THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS “AS IS”
-AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
-IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
-ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
-LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
-CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
-SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
-INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
-CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
-ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
-POSSIBILITY OF SUCH DAMAGE.
-***********************************************************************/
-
-/*! \file silk_Inlines.h
- * \brief silk_Inlines.h defines inline signal processing functions.
- */
-
-#ifndef SILK_FIX_INLINES_H
-#define SILK_FIX_INLINES_H
-
-#ifdef __cplusplus
-extern "C"
-{
-#endif
-
-/* count leading zeros of opus_int64 */
-static inline opus_int32 silk_CLZ64( opus_int64 in )
-{
- opus_int32 in_upper;
-
- in_upper = (opus_int32)silk_RSHIFT64(in, 32);
- if (in_upper == 0) {
- /* Search in the lower 32 bits */
- return 32 + silk_CLZ32( (opus_int32) in );
- } else {
- /* Search in the upper 32 bits */
- return silk_CLZ32( in_upper );
- }
-}
-
-/* get number of leading zeros and fractional part (the bits right after the leading one */
-static inline void silk_CLZ_FRAC(
- opus_int32 in, /* I input */
- opus_int32 *lz, /* O number of leading zeros */
- opus_int32 *frac_Q7 /* O the 7 bits right after the leading one */
-)
-{
- opus_int32 lzeros = silk_CLZ32(in);
-
- * lz = lzeros;
- * frac_Q7 = silk_ROR32(in, 24 - lzeros) & 0x7f;
-}
-
-/* Approximation of square root */
-/* Accuracy: < +/- 10% for output values > 15 */
-/* < +/- 2.5% for output values > 120 */
-static inline opus_int32 silk_SQRT_APPROX( opus_int32 x )
-{
- opus_int32 y, lz, frac_Q7;
-
- if( x <= 0 ) {
- return 0;
- }
-
- silk_CLZ_FRAC(x, &lz, &frac_Q7);
-
- if( lz & 1 ) {
- y = 32768;
- } else {
- y = 46214; /* 46214 = sqrt(2) * 32768 */
- }
-
- /* get scaling right */
- y >>= silk_RSHIFT(lz, 1);
-
- /* increment using fractional part of input */
- y = silk_SMLAWB(y, y, silk_SMULBB(213, frac_Q7));
-
- return y;
-}
-
-/* Divide two int32 values and return result as int32 in a given Q-domain */
-static inline opus_int32 silk_DIV32_varQ( /* O returns a good approximation of "(a32 << Qres) / b32" */
- const opus_int32 a32, /* I numerator (Q0) */
- const opus_int32 b32, /* I denominator (Q0) */
- const opus_int Qres /* I Q-domain of result (>= 0) */
-)
-{
- opus_int a_headrm, b_headrm, lshift;
- opus_int32 b32_inv, a32_nrm, b32_nrm, result;
-
- silk_assert( b32 != 0 );
- silk_assert( Qres >= 0 );
-
- /* Compute number of bits head room and normalize inputs */
- a_headrm = silk_CLZ32( silk_abs(a32) ) - 1;
- a32_nrm = silk_LSHIFT(a32, a_headrm); /* Q: a_headrm */
- b_headrm = silk_CLZ32( silk_abs(b32) ) - 1;
- b32_nrm = silk_LSHIFT(b32, b_headrm); /* Q: b_headrm */
-
- /* Inverse of b32, with 14 bits of precision */
- b32_inv = silk_DIV32_16( silk_int32_MAX >> 2, silk_RSHIFT(b32_nrm, 16) ); /* Q: 29 + 16 - b_headrm */
-
- /* First approximation */
- result = silk_SMULWB(a32_nrm, b32_inv); /* Q: 29 + a_headrm - b_headrm */
-
- /* Compute residual by subtracting product of denominator and first approximation */
- /* It's OK to overflow because the final value of a32_nrm should always be small */
- a32_nrm = silk_SUB32_ovflw(a32_nrm, silk_LSHIFT_ovflw( silk_SMMUL(b32_nrm, result), 3 )); /* Q: a_headrm */
-
- /* Refinement */
- result = silk_SMLAWB(result, a32_nrm, b32_inv); /* Q: 29 + a_headrm - b_headrm */
-
- /* Convert to Qres domain */
- lshift = 29 + a_headrm - b_headrm - Qres;
- if( lshift < 0 ) {
- return silk_LSHIFT_SAT32(result, -lshift);
- } else {
- if( lshift < 32){
- return silk_RSHIFT(result, lshift);
- } else {
- /* Avoid undefined result */
- return 0;
- }
- }
-}
-
-/* Invert int32 value and return result as int32 in a given Q-domain */
-static inline opus_int32 silk_INVERSE32_varQ( /* O returns a good approximation of "(1 << Qres) / b32" */
- const opus_int32 b32, /* I denominator (Q0) */
- const opus_int Qres /* I Q-domain of result (> 0) */
-)
-{
- opus_int b_headrm, lshift;
- opus_int32 b32_inv, b32_nrm, err_Q32, result;
-
- silk_assert( b32 != 0 );
- silk_assert( Qres > 0 );
-
- /* Compute number of bits head room and normalize input */
- b_headrm = silk_CLZ32( silk_abs(b32) ) - 1;
- b32_nrm = silk_LSHIFT(b32, b_headrm); /* Q: b_headrm */
-
- /* Inverse of b32, with 14 bits of precision */
- b32_inv = silk_DIV32_16( silk_int32_MAX >> 2, silk_RSHIFT(b32_nrm, 16) ); /* Q: 29 + 16 - b_headrm */
-
- /* First approximation */
- result = silk_LSHIFT(b32_inv, 16); /* Q: 61 - b_headrm */
-
- /* Compute residual by subtracting product of denominator and first approximation from one */
- err_Q32 = silk_LSHIFT( ((opus_int32)1<<29) - silk_SMULWB(b32_nrm, b32_inv), 3 ); /* Q32 */
-
- /* Refinement */
- result = silk_SMLAWW(result, err_Q32, b32_inv); /* Q: 61 - b_headrm */
-
- /* Convert to Qres domain */
- lshift = 61 - b_headrm - Qres;
- if( lshift <= 0 ) {
- return silk_LSHIFT_SAT32(result, -lshift);
- } else {
- if( lshift < 32){
- return silk_RSHIFT(result, lshift);
- }else{
- /* Avoid undefined result */
- return 0;
- }
- }
-}
-
-#ifdef __cplusplus
-}
-#endif
-
-#endif /* SILK_FIX_INLINES_H */
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