1 /* Copyright (C) 2013 Xiph.Org Foundation and contributors */ 2 /* 3 Redistribution and use in source and binary forms, with or without 4 modification, are permitted provided that the following conditions 5 are met: 6 7 - Redistributions of source code must retain the above copyright 8 notice, this list of conditions and the following disclaimer. 9 10 - Redistributions in binary form must reproduce the above copyright 11 notice, this list of conditions and the following disclaimer in the 12 documentation and/or other materials provided with the distribution. 13 14 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 15 ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 16 LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 17 A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER 18 OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 19 EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 20 PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 21 PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF 22 LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING 23 NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS 24 SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 25 */ 26 27 #ifndef FIXED_ARMv4_H 28 #define FIXED_ARMv4_H 29 30 /** 16x32 multiplication, followed by a 16-bit shift right. Results fits in 32 bits */ 31 #undef MULT16_32_Q16 32 static OPUS_INLINE opus_val32 MULT16_32_Q16_armv4(opus_val16 a, opus_val32 b) 33 { 34 unsigned rd_lo; 35 int rd_hi; 36 __asm__( 37 "#MULT16_32_Q16\n\t" 38 "smull %0, %1, %2, %3\n\t" 39 : "=&r"(rd_lo), "=&r"(rd_hi) 40 : "%r"(b),"r"(a<<16) 41 ); 42 return rd_hi; 43 } 44 #define MULT16_32_Q16(a, b) (MULT16_32_Q16_armv4(a, b)) 45 46 47 /** 16x32 multiplication, followed by a 15-bit shift right. Results fits in 32 bits */ 48 #undef MULT16_32_Q15 49 static OPUS_INLINE opus_val32 MULT16_32_Q15_armv4(opus_val16 a, opus_val32 b) 50 { 51 unsigned rd_lo; 52 int rd_hi; 53 __asm__( 54 "#MULT16_32_Q15\n\t" 55 "smull %0, %1, %2, %3\n\t" 56 : "=&r"(rd_lo), "=&r"(rd_hi) 57 : "%r"(b), "r"(a<<16) 58 ); 59 /*We intentionally don't OR in the high bit of rd_lo for speed.*/ 60 return rd_hi<<1; 61 } 62 #define MULT16_32_Q15(a, b) (MULT16_32_Q15_armv4(a, b)) 63 64 65 /** 16x32 multiply, followed by a 15-bit shift right and 32-bit add. 66 b must fit in 31 bits. 67 Result fits in 32 bits. */ 68 #undef MAC16_32_Q15 69 #define MAC16_32_Q15(c, a, b) ADD32(c, MULT16_32_Q15(a, b)) 70 71 72 /** 32x32 multiplication, followed by a 31-bit shift right. Results fits in 32 bits */ 73 #undef MULT32_32_Q31 74 #define MULT32_32_Q31(a,b) (opus_val32)((((opus_int64)(a)) * ((opus_int64)(b)))>>31) 75 76 #endif 77
