diff options
Diffstat (limited to 'fixedpoint/fixedpoint.h')
| -rw-r--r-- | fixedpoint/fixedpoint.h | 30 |
1 files changed, 22 insertions, 8 deletions
diff --git a/fixedpoint/fixedpoint.h b/fixedpoint/fixedpoint.h index 58e8050..56e95c0 100644 --- a/fixedpoint/fixedpoint.h +++ b/fixedpoint/fixedpoint.h @@ -95,12 +95,13 @@ tIntegerType Add(tIntegerType a, tIntegerType b) { return a + b; } -// Integer subtraction. Not saturating. Overflow is undefined behavior. +// Integer multiplication. Not saturating. Overflow is undefined behavior. template <typename tIntegerType> tIntegerType Mul(tIntegerType a, tIntegerType b) { return a * b; } +// Integer subtraction. Not saturating. Overflow is undefined behavior. template <typename tIntegerType> tIntegerType Sub(tIntegerType a, tIntegerType b) { return a - b; @@ -268,6 +269,16 @@ inline std::int16_t SaturatingAdd(std::int16_t a, std::int16_t b) { std::max(static_cast<std::int32_t>(-32768), sum))); } +template <> +inline std::int8_t SaturatingAdd(std::int8_t a, std::int8_t b) { + std::int16_t a16 = a; + std::int16_t b16 = b; + std::int16_t sum = a16 + b16; + return static_cast<std::int8_t>(std::min( + static_cast<int16_t>(std::numeric_limits<int8_t>::max()), + std::max(static_cast<int16_t>(std::numeric_limits<int8_t>::min()), sum))); +} + // Returns a+b, saturating if the integers are 16bit or narrower, // otherwise just a plain addition. template <typename IntegerType, bool Is16Bit> @@ -767,13 +778,14 @@ FixedPoint<tRawType, 0> exp_on_negative_values( result * kMultiplier, result); \ } - GEMMLOWP_EXP_BARREL_SHIFTER(-2, 1672461947); - GEMMLOWP_EXP_BARREL_SHIFTER(-1, 1302514674); - GEMMLOWP_EXP_BARREL_SHIFTER(+0, 790015084); - GEMMLOWP_EXP_BARREL_SHIFTER(+1, 290630308); - GEMMLOWP_EXP_BARREL_SHIFTER(+2, 39332535); - GEMMLOWP_EXP_BARREL_SHIFTER(+3, 720401); - GEMMLOWP_EXP_BARREL_SHIFTER(+4, 242); + // Constants below are Q0 representations of negative exp fractionals: + GEMMLOWP_EXP_BARREL_SHIFTER(-2, 1672461947); // exp(-1/4) + GEMMLOWP_EXP_BARREL_SHIFTER(-1, 1302514674); // exp(-1/2) + GEMMLOWP_EXP_BARREL_SHIFTER(+0, 790015084); // exp(-1) + GEMMLOWP_EXP_BARREL_SHIFTER(+1, 290630308); // exp(-2) + GEMMLOWP_EXP_BARREL_SHIFTER(+2, 39332535); // exp(-4) + GEMMLOWP_EXP_BARREL_SHIFTER(+3, 720401); // exp(-8) + GEMMLOWP_EXP_BARREL_SHIFTER(+4, 242); // exp(-16) #undef GEMMLOWP_EXP_BARREL_SHIFTER @@ -895,6 +907,8 @@ FixedPoint<tRawType, 0> logistic(FixedPoint<tRawType, tIntegerBits> a) { #include "./fixedpoint_sse.h" #elif defined(GEMMLOWP_MSA) #include "./fixedpoint_msa.h" +#elif defined(GEMMLOWP_WASMSIMD) +#include "./fixedpoint_wasmsimd.h" #endif #endif // GEMMLOWP_INTERNAL_FIXEDPOINT_H_ |