/**
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* @file rem_dsp.h DSP routines
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*
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* Copyright (C) 2010 Creytiv.com
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*/
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#ifndef UINT8_MAX
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#define UINT8_MAX (255U)
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#endif
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#define INT15_MAX 0x3fff
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#define INT15_MIN (-INT15_MAX - 1)
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#ifndef INT16_MAX
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#define INT16_MAX 0x7fff
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#endif
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#ifndef INT16_MIN
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#define INT16_MIN (-INT16_MAX - 1)
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#endif
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/* todo: check which preprocessor macros to use */
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#if defined (HAVE_ARMV6) || defined (HAVE_NEON)
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static inline uint8_t saturate_u8(int32_t a)
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{
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uint8_t r;
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__asm__ __volatile__ ("usat %0, #8, %1" : "=r"(r) : "r"(a));
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return r;
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}
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static inline int16_t saturate_s15(int32_t a)
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{
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__asm__ __volatile__ ("ssat %0, #15, %1 \n\t"
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: "+r"(a)
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: "r"(a)
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);
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return a;
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}
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static inline int16_t saturate_s16(int32_t a)
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{
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__asm__ __volatile__ ("ssat %0, #16, %1 \n\t"
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: "+r"(a)
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: "r"(a)
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);
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return a;
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}
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static inline int16_t saturate_add16(int32_t a, int32_t b)
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{
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__asm__ __volatile__ ("add %0, %1, %2 \n\t"
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"ssat %0, #16, %0 \n\t"
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:"+r"(a)
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:"r"(a), "r"(b)
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);
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return a;
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}
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static inline int16_t saturate_sub16(int32_t a, int32_t b)
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{
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__asm__ __volatile__ ("sub %0, %1, %2 \n\t"
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"ssat %0, #16, %0 \n\t"
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:"+r"(a)
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:"r"(a), "r"(b)
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);
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return a;
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}
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#else
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static inline uint8_t saturate_u8(int32_t a)
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{
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return (a > (int32_t)UINT8_MAX) ? UINT8_MAX : ((a < 0) ? 0 : a);
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}
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static inline int16_t saturate_s15(int32_t a)
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{
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if (a > INT15_MAX)
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return INT15_MAX;
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else if (a < INT15_MIN)
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return INT15_MIN;
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else
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return a;
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}
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static inline int16_t saturate_s16(int32_t a)
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{
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if (a > INT16_MAX)
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return INT16_MAX;
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else if (a < INT16_MIN)
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return INT16_MIN;
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else
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return a;
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}
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static inline int16_t saturate_add16(int32_t a, int32_t b)
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{
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return saturate_s16(a + b);
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}
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static inline int16_t saturate_sub16(int32_t a, int32_t b)
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{
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return saturate_s16(a - b);
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}
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#endif
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#ifdef HAVE_NEON
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static inline int ABS32(int a)
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{
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int r;
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__asm__ __volatile__ ("vmov.s32 d0[0], %1 \t\n"
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"vabs.s32 d0, d0 \t\n"
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"vmov.s32 %0, d0[0] \t\n"
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: "=r"(r)
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: "r"(a)
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);
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return a;
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}
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#else
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static inline int ABS32(int a)
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{
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return a > 0 ? a : -a;
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}
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#endif
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