cannam@154: /* Copyright (C) 2013 Xiph.Org Foundation and contributors */
cannam@154: /*
cannam@154:    Redistribution and use in source and binary forms, with or without
cannam@154:    modification, are permitted provided that the following conditions
cannam@154:    are met:
cannam@154: 
cannam@154:    - Redistributions of source code must retain the above copyright
cannam@154:    notice, this list of conditions and the following disclaimer.
cannam@154: 
cannam@154:    - Redistributions in binary form must reproduce the above copyright
cannam@154:    notice, this list of conditions and the following disclaimer in the
cannam@154:    documentation and/or other materials provided with the distribution.
cannam@154: 
cannam@154:    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
cannam@154:    ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
cannam@154:    LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
cannam@154:    A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER
cannam@154:    OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
cannam@154:    EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
cannam@154:    PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
cannam@154:    PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
cannam@154:    LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
cannam@154:    NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
cannam@154:    SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
cannam@154: */
cannam@154: 
cannam@154: #ifndef FIXED_ARMv4_H
cannam@154: #define FIXED_ARMv4_H
cannam@154: 
cannam@154: /** 16x32 multiplication, followed by a 16-bit shift right. Results fits in 32 bits */
cannam@154: #undef MULT16_32_Q16
cannam@154: static OPUS_INLINE opus_val32 MULT16_32_Q16_armv4(opus_val16 a, opus_val32 b)
cannam@154: {
cannam@154:   unsigned rd_lo;
cannam@154:   int rd_hi;
cannam@154:   __asm__(
cannam@154:       "#MULT16_32_Q16\n\t"
cannam@154:       "smull %0, %1, %2, %3\n\t"
cannam@154:       : "=&r"(rd_lo), "=&r"(rd_hi)
cannam@154:       : "%r"(b),"r"(SHL32(a,16))
cannam@154:   );
cannam@154:   return rd_hi;
cannam@154: }
cannam@154: #define MULT16_32_Q16(a, b) (MULT16_32_Q16_armv4(a, b))
cannam@154: 
cannam@154: 
cannam@154: /** 16x32 multiplication, followed by a 15-bit shift right. Results fits in 32 bits */
cannam@154: #undef MULT16_32_Q15
cannam@154: static OPUS_INLINE opus_val32 MULT16_32_Q15_armv4(opus_val16 a, opus_val32 b)
cannam@154: {
cannam@154:   unsigned rd_lo;
cannam@154:   int rd_hi;
cannam@154:   __asm__(
cannam@154:       "#MULT16_32_Q15\n\t"
cannam@154:       "smull %0, %1, %2, %3\n\t"
cannam@154:       : "=&r"(rd_lo), "=&r"(rd_hi)
cannam@154:       : "%r"(b), "r"(SHL32(a,16))
cannam@154:   );
cannam@154:   /*We intentionally don't OR in the high bit of rd_lo for speed.*/
cannam@154:   return SHL32(rd_hi,1);
cannam@154: }
cannam@154: #define MULT16_32_Q15(a, b) (MULT16_32_Q15_armv4(a, b))
cannam@154: 
cannam@154: 
cannam@154: /** 16x32 multiply, followed by a 15-bit shift right and 32-bit add.
cannam@154:     b must fit in 31 bits.
cannam@154:     Result fits in 32 bits. */
cannam@154: #undef MAC16_32_Q15
cannam@154: #define MAC16_32_Q15(c, a, b) ADD32(c, MULT16_32_Q15(a, b))
cannam@154: 
cannam@154: /** 16x32 multiply, followed by a 16-bit shift right and 32-bit add.
cannam@154:     Result fits in 32 bits. */
cannam@154: #undef MAC16_32_Q16
cannam@154: #define MAC16_32_Q16(c, a, b) ADD32(c, MULT16_32_Q16(a, b))
cannam@154: 
cannam@154: /** 32x32 multiplication, followed by a 31-bit shift right. Results fits in 32 bits */
cannam@154: #undef MULT32_32_Q31
cannam@154: #define MULT32_32_Q31(a,b) (opus_val32)((((opus_int64)(a)) * ((opus_int64)(b)))>>31)
cannam@154: 
cannam@154: #endif