_mm_mask_rolv_epi64
Classification
AVX-512, Shift, CPUID Test: AVX512F
Header File
Instruction
VPROLVQ xmm {k}, xmm, xmm
Synopsis
_mm_mask_rolv_epi64(__m128i src, __mmask8 k, __m128i a, __m128i b);
Description
Rotate the bits in each packed 64-bit integer in "a" to the left by the number of bits specified in the corresponding element of "b", and store the results in "dst" using writemask "k" (elements are copied from "src" when the corresponding mask bit is not set).
Operation
DEFINE LEFT_ROTATE_QWORDS(src, count_src) {
count := count_src % 64
RETURN (src << count) OR (src >> (64 - count))
}
FOR j := 0 to 1
i := j*64
IF k[j]
dst[i+63:i] := LEFT_ROTATE_QWORDS(a[i+63:i], b[i+63:i])
ELSE
dst[i+63:i] := src[i+63:i]
FI
ENDFOR
dst[MAX:128] := 0