Use the following SSSE3 intrinsics to compute absolute values.
extern __m128i _mm_abs_epi8 (__m128i a);
Compute absolute value of signed bytes.
Interpreting a and r as arrays of signed 8-bit integers:
for (i = 0; i < 16; i++) {
r[i] = abs(a[i]);
}
extern __m128i _mm_abs_epi16 (__m128i a);
Compute absolute value of signed words.
Interpreting a and r as arrays of signed 16-bit integers:
for (i = 0; i < 8; i++) {
r[i] = abs(a[i]);
}
extern __m128i _mm_abs_epi32 (__m128i a);
Compute absolute value of signed dwords.
Interpreting a and r as arrays of signed 32-bit integers:
for (i = 0; i < 4; i++) {
r[i] = abs(a[i]);
}
extern __m64 _mm_abs_pi8 (__m64 a);
Compute absolute value of signed bytes.
Interpreting a and r as arrays of signed 8-bit integers:
for (i = 0; i < 8; i++) {
r[i] = abs(a[i]);
}
extern __m64 _mm_abs_pi16 (__m64 a);
Compute absolute value of signed words.
Interpreting a and r as arrays of signed 16-bit integers:
for (i = 0; i < 4; i++) {
r[i] = abs(a[i]);
}
extern __m64 _mm_abs_pi32 (__m64 a);
Compute absolute value of signed dwords.
Interpreting a and r as arrays of signed 32-bit integers:
for (i = 0; i < 2; i++) {
r[i] = abs(a[i]);
}