Created
January 11, 2015 22:21
ConvertS16ToF32
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void ConvertS16ToF32(float *out, const s16 *in, size_t size) { | |
#ifdef _M_SSE | |
const __m128i zero = _mm_setzero_si128(); | |
while (size >= 8) { | |
__m128i indata1 = _mm_loadu_si128((__m128i *)in); | |
// Now we unpack with "sign extension", by unpacking with 0xFFFF if zero is greater. | |
__m128i insign1 = _mm_cmpgt_epi16(zero, indata1); | |
__m128i indata1lo = _mm_unpacklo_epi16(indata1, insign1); | |
__m128i indata1hi = _mm_unpackhi_epi16(indata1, insign1); | |
_mm_storeu_ps(out, _mm_cvtepi32_ps(indata1lo)); | |
_mm_storeu_ps(out + 4, _mm_cvtepi32_ps(indata1hi)); | |
in += 8; | |
out += 8; | |
size -= 8; | |
} | |
#endif | |
for (size_t i = 0; i < size; i++) { | |
out[i] = in[i] * (1.0f / 32767.0f); | |
} | |
} |
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