_mm512_reduce_max_epu64
Classification
AVX-512, Special Math Functions, CPUID Test: AVX512F
Header File
immintrin.h
Synopsis
 _mm512_reduce_max_epu64(__m512i a);
Description
Reduce the packed unsigned 64-bit integers in "a" by maximum. Returns the maximum of all elements in "a".
Operation
DEFINE REDUCE_MAX(src, len) {
	IF len == 2
		RETURN (src[63:0] > src[127:64] ? src[63:0] : src[127:64])
	FI
	len := len / 2
	FOR j:= 0 to (len-1)
		i := j*64
		src[i+63:i] := (src[i+63:i] > src[i+64*len+63:i+64*len] ? src[i+63:i] : src[i+64*len+63:i+64*len])
	ENDFOR
	RETURN REDUCE_MAX(src[64*len-1:0], len)
}
dst[63:0] := REDUCE_MAX(a, 8)