Chris@69: /* Copyright (C) 2013 Xiph.Org Foundation and contributors */
Chris@69: /*
Chris@69:    Redistribution and use in source and binary forms, with or without
Chris@69:    modification, are permitted provided that the following conditions
Chris@69:    are met:
Chris@69: 
Chris@69:    - Redistributions of source code must retain the above copyright
Chris@69:    notice, this list of conditions and the following disclaimer.
Chris@69: 
Chris@69:    - Redistributions in binary form must reproduce the above copyright
Chris@69:    notice, this list of conditions and the following disclaimer in the
Chris@69:    documentation and/or other materials provided with the distribution.
Chris@69: 
Chris@69:    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
Chris@69:    ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
Chris@69:    LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
Chris@69:    A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER
Chris@69:    OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
Chris@69:    EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
Chris@69:    PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
Chris@69:    PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
Chris@69:    LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
Chris@69:    NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
Chris@69:    SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
Chris@69: */
Chris@69: 
Chris@69: #ifndef FIXED_ARMv4_H
Chris@69: #define FIXED_ARMv4_H
Chris@69: 
Chris@69: /** 16x32 multiplication, followed by a 16-bit shift right. Results fits in 32 bits */
Chris@69: #undef MULT16_32_Q16
Chris@69: static OPUS_INLINE opus_val32 MULT16_32_Q16_armv4(opus_val16 a, opus_val32 b)
Chris@69: {
Chris@69:   unsigned rd_lo;
Chris@69:   int rd_hi;
Chris@69:   __asm__(
Chris@69:       "#MULT16_32_Q16\n\t"
Chris@69:       "smull %0, %1, %2, %3\n\t"
Chris@69:       : "=&r"(rd_lo), "=&r"(rd_hi)
Chris@69:       : "%r"(b),"r"(SHL32(a,16))
Chris@69:   );
Chris@69:   return rd_hi;
Chris@69: }
Chris@69: #define MULT16_32_Q16(a, b) (MULT16_32_Q16_armv4(a, b))
Chris@69: 
Chris@69: 
Chris@69: /** 16x32 multiplication, followed by a 15-bit shift right. Results fits in 32 bits */
Chris@69: #undef MULT16_32_Q15
Chris@69: static OPUS_INLINE opus_val32 MULT16_32_Q15_armv4(opus_val16 a, opus_val32 b)
Chris@69: {
Chris@69:   unsigned rd_lo;
Chris@69:   int rd_hi;
Chris@69:   __asm__(
Chris@69:       "#MULT16_32_Q15\n\t"
Chris@69:       "smull %0, %1, %2, %3\n\t"
Chris@69:       : "=&r"(rd_lo), "=&r"(rd_hi)
Chris@69:       : "%r"(b), "r"(SHL32(a,16))
Chris@69:   );
Chris@69:   /*We intentionally don't OR in the high bit of rd_lo for speed.*/
Chris@69:   return SHL32(rd_hi,1);
Chris@69: }
Chris@69: #define MULT16_32_Q15(a, b) (MULT16_32_Q15_armv4(a, b))
Chris@69: 
Chris@69: 
Chris@69: /** 16x32 multiply, followed by a 15-bit shift right and 32-bit add.
Chris@69:     b must fit in 31 bits.
Chris@69:     Result fits in 32 bits. */
Chris@69: #undef MAC16_32_Q15
Chris@69: #define MAC16_32_Q15(c, a, b) ADD32(c, MULT16_32_Q15(a, b))
Chris@69: 
Chris@69: /** 16x32 multiply, followed by a 16-bit shift right and 32-bit add.
Chris@69:     Result fits in 32 bits. */
Chris@69: #undef MAC16_32_Q16
Chris@69: #define MAC16_32_Q16(c, a, b) ADD32(c, MULT16_32_Q16(a, b))
Chris@69: 
Chris@69: /** 32x32 multiplication, followed by a 31-bit shift right. Results fits in 32 bits */
Chris@69: #undef MULT32_32_Q31
Chris@69: #define MULT32_32_Q31(a,b) (opus_val32)((((opus_int64)(a)) * ((opus_int64)(b)))>>31)
Chris@69: 
Chris@69: #endif