[x86/x86_64] Speed up linear interpolation resampler

Olav Sørensen committed 5 years ago

Commit a2ad39d1 parent 7fe7a351 file · +8 −2Browse files

Unified · Split

@@ -131,13 +131,19 @@ · 130 unmodified lines
131	131
132	132	#define LINEAR_INTERPOLATION8(s, f) \
133	133	{ \
134		− const double dFrac = (const double)((uint32_t)f * (1.0 / (UINT32_MAX+1.0))); /* 0.0 .. 0.999999999 */ \
	134	+ /* uint32_t -> int32_t so that we can use SIMD for fast int->double conversion */ \
	135	+ const int32_t frac = (uint32_t)(f) >> 1; /* (2^32)-1 -> (2^31)-1 */ \
	136	+ \
	137	+ const double dFrac = (double)(frac * (1.0 / (INT32_MAX+1.0))); /* 0.0 .. 0.999999999 */ \
135	138	dSample = ((s[0] + (s[1]-s[0]) * dFrac)) * (1.0 / 128.0); \
136	139	} \
137	140
138	141	#define LINEAR_INTERPOLATION16(s, f) \
139	142	{ \
140		− const double dFrac = (const double)((uint32_t)f * (1.0 / (UINT32_MAX+1.0))); /* 0.0 .. 0.999999999 */ \
	143	+ /* uint32_t -> int32_t so that we can use SIMD for fast int->double conversion */ \
	144	+ const int32_t frac = (uint32_t)(f) >> 1; /* (2^32)-1 -> (2^31)-1 */ \
	145	+ \
	146	+ const double dFrac = (double)(frac * (1.0 / (INT32_MAX+1.0))); /* 0.0 .. 0.999999999 */ \
141	147	dSample = ((s[0] + (s[1]-s[0]) * dFrac)) * (1.0 / 32768.0); \
142	148	} \
143	149

Keyboard shortcuts