Visible to Intel only — GUID: GUID-F5FD6FD4-51B4-421C-95AB-7DA2F8242906
Visible to Intel only — GUID: GUID-F5FD6FD4-51B4-421C-95AB-7DA2F8242906
Subtraction Intrinsics
These Supplemental Streaming SIMD Extensions 3 (SSSE3) intrinsics are used for horizontal subtraction. The prototypes for these intrinsics are in tmmintrin.h.
To use these intrinsics, include the immintrin.h file as follows:
#include <immintrin.h>
_mm_hsub_epi16
extern __m128i _mm_hsub_epi16(__m128i a, __m128i b);
Subtract horizontally packed signed words.
Interpreting a, b, and r as arrays of 16-bit signed integers:
for (i = 0; i < 4; i++) { r[i] = a[2*i] - a[2i+1]; r[i+4] = b[2*i] - b[2*i+1]; }
_mm_hsub_epi32
extern __m128i _mm_hsub_epi32(__m128i a, __m128i b);
Subtracts horizontally packed signed doublewords.
Interpreting a, b, and r as arrays of 32-bit signed integers:
for (i = 0; i < 2; i++) { r[i] = a[2*i] - a[2i+1]; r[i+2] = b[2*i] - b[2*i+1]; }
_mm_hsubs_epi16
extern __m128i _mm_hsubs_epi16(__m128i a, __m128i b);
Subtracts horizontally packed signed words with signed saturation.
Interpreting a, b, and r as arrays of 16-bit signed integers:
for (i = 0; i < 4; i++) { r[i] = signed_saturate_to_word(a[2*i] - a[2i+1]); r[i+4] = signed_saturate_to_word(b[2*i] - b[2*i+1]); }
_mm_hsub_pi16
extern __m64 _mm_hsub_pi16(__m64 a, __m64 b);
Subtracts horizontally packed signed words.
Interpreting a, b, and r as arrays of 16-bit signed integers:
for (i = 0; i < 2; i++) { r[i] = a[2*i] - a[2i+1]; r[i+2] = b[2*i] - b[2*i+1]; }
_mm_hsub_pi32
extern __m64 _mm_hsub_pi32(__m64 a, __m64 b);
Subtracts horizontally packed signed doublewords.
Interpreting a, b, and r as arrays of 32-bit signed integers:
r[0] = a[0] - a[1]; r[1] = b[0] - b[1];
_mm_hsubs_pi16
extern __m64 _mm_hsubs_pi16(__m64 a, __m64 b);
Subtracts horizontally packed signed words with signed saturation.
Interpreting a, b, and r as arrays of 16-bit signed integers:
for (i = 0; i < 2; i++) { r[i] = signed_saturate_to_word(a[2*i] - a[2i+1]); r[i+2] = signed_saturate_to_word(b[2*i] - b[2*i+1]); }