Chris@69: /***********************************************************************
Chris@69: Copyright (C) 2013 Xiph.Org Foundation and contributors.
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: - Redistributions of source code must retain the above copyright notice,
Chris@69: this list of conditions and the following disclaimer.
Chris@69: - Redistributions in binary form must reproduce the above copyright
Chris@69: notice, this list of conditions and the following disclaimer in the
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Chris@69: - Neither the name of Internet Society, IETF or IETF Trust, nor the
Chris@69: names of specific contributors, may be used to endorse or promote
Chris@69: products derived from this software without specific prior written
Chris@69: permission.
Chris@69: THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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Chris@69: POSSIBILITY OF SUCH DAMAGE.
Chris@69: ***********************************************************************/
Chris@69: 
Chris@69: #ifndef SILK_MACROS_ARMv4_H
Chris@69: #define SILK_MACROS_ARMv4_H
Chris@69: 
Chris@69: /* This macro only avoids the undefined behaviour from a left shift of
Chris@69:    a negative value. It should only be used in macros that can't include
Chris@69:    SigProc_FIX.h. In other cases, use silk_LSHIFT32(). */
Chris@69: #define SAFE_SHL(a,b) ((opus_int32)((opus_uint32)(a) << (b)))
Chris@69: 
Chris@69: /* (a32 * (opus_int32)((opus_int16)(b32))) >> 16 output have to be 32bit int */
Chris@69: #undef silk_SMULWB
Chris@69: static OPUS_INLINE opus_int32 silk_SMULWB_armv4(opus_int32 a, opus_int16 b)
Chris@69: {
Chris@69:   unsigned rd_lo;
Chris@69:   int rd_hi;
Chris@69:   __asm__(
Chris@69:       "#silk_SMULWB\n\t"
Chris@69:       "smull %0, %1, %2, %3\n\t"
Chris@69:       : "=&r"(rd_lo), "=&r"(rd_hi)
Chris@69:       : "%r"(a), "r"(SAFE_SHL(b,16))
Chris@69:   );
Chris@69:   return rd_hi;
Chris@69: }
Chris@69: #define silk_SMULWB(a, b) (silk_SMULWB_armv4(a, b))
Chris@69: 
Chris@69: /* a32 + (b32 * (opus_int32)((opus_int16)(c32))) >> 16 output have to be 32bit int */
Chris@69: #undef silk_SMLAWB
Chris@69: #define silk_SMLAWB(a, b, c) ((a) + silk_SMULWB(b, c))
Chris@69: 
Chris@69: /* (a32 * (b32 >> 16)) >> 16 */
Chris@69: #undef silk_SMULWT
Chris@69: static OPUS_INLINE opus_int32 silk_SMULWT_armv4(opus_int32 a, opus_int32 b)
Chris@69: {
Chris@69:   unsigned rd_lo;
Chris@69:   int rd_hi;
Chris@69:   __asm__(
Chris@69:       "#silk_SMULWT\n\t"
Chris@69:       "smull %0, %1, %2, %3\n\t"
Chris@69:       : "=&r"(rd_lo), "=&r"(rd_hi)
Chris@69:       : "%r"(a), "r"(b&~0xFFFF)
Chris@69:   );
Chris@69:   return rd_hi;
Chris@69: }
Chris@69: #define silk_SMULWT(a, b) (silk_SMULWT_armv4(a, b))
Chris@69: 
Chris@69: /* a32 + (b32 * (c32 >> 16)) >> 16 */
Chris@69: #undef silk_SMLAWT
Chris@69: #define silk_SMLAWT(a, b, c) ((a) + silk_SMULWT(b, c))
Chris@69: 
Chris@69: /* (a32 * b32) >> 16 */
Chris@69: #undef silk_SMULWW
Chris@69: static OPUS_INLINE opus_int32 silk_SMULWW_armv4(opus_int32 a, opus_int32 b)
Chris@69: {
Chris@69:   unsigned rd_lo;
Chris@69:   int rd_hi;
Chris@69:   __asm__(
Chris@69:     "#silk_SMULWW\n\t"
Chris@69:     "smull %0, %1, %2, %3\n\t"
Chris@69:     : "=&r"(rd_lo), "=&r"(rd_hi)
Chris@69:     : "%r"(a), "r"(b)
Chris@69:   );
Chris@69:   return SAFE_SHL(rd_hi,16)+(rd_lo>>16);
Chris@69: }
Chris@69: #define silk_SMULWW(a, b) (silk_SMULWW_armv4(a, b))
Chris@69: 
Chris@69: #undef silk_SMLAWW
Chris@69: static OPUS_INLINE opus_int32 silk_SMLAWW_armv4(opus_int32 a, opus_int32 b,
Chris@69:  opus_int32 c)
Chris@69: {
Chris@69:   unsigned rd_lo;
Chris@69:   int rd_hi;
Chris@69:   __asm__(
Chris@69:     "#silk_SMLAWW\n\t"
Chris@69:     "smull %0, %1, %2, %3\n\t"
Chris@69:     : "=&r"(rd_lo), "=&r"(rd_hi)
Chris@69:     : "%r"(b), "r"(c)
Chris@69:   );
Chris@69:   return a+SAFE_SHL(rd_hi,16)+(rd_lo>>16);
Chris@69: }
Chris@69: #define silk_SMLAWW(a, b, c) (silk_SMLAWW_armv4(a, b, c))
Chris@69: 
Chris@69: #undef SAFE_SHL
Chris@69: 
Chris@69: #endif /* SILK_MACROS_ARMv4_H */