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