_mm512_mask_reduce_mul_epi32
Classification
KNC, Arithmetic, CPUID Test: KNCNI
Header File
immintrin.h
Synopsis
 _mm512_mask_reduce_mul_epi32(__mmask16 k, __m512i a);
Description
Reduce the packed 32-bit integers in "a" by multiplication using mask "k". Returns the product of all active elements in "a".
Operation
DEFINE REDUCE_MUL(src, len) {
	IF len == 2
		RETURN src[31:0] * src[63:32]
	FI
	len := len / 2
	FOR j:= 0 to (len-1)
		i := j*32
		src[i+31:i] := src[i+31:i] * src[i+32*len+31:i+32*len]
	ENDFOR
	RETURN REDUCE_MUL(src[32*len-1:0], len)
}
tmp := a
FOR j := 0 to 16
	i := j*32
	IF k[j]
		tmp[i+31:i] := a[i+31:i]
	ELSE
		tmp[i+31:i] := 1
	FI
ENDFOR
dst[31:0] := REDUCE_MUL(tmp, 16)