_mm_mask_reduce_max_epi16
Classification
AVX-512, Special Math Functions, CPUID Test: AVX512BW
Header File
immintrin.h
Synopsis
 _mm_mask_reduce_max_epi16(__mmask8 k, __m128i a);
Description
Reduce the packed signed 16-bit integers in "a" by maximum using mask "k". Returns the maximum of all active elements in "a".
Operation
DEFINE REDUCE_MAX(src, len) {
	IF len == 2
		RETURN (src[15:0] > src[31:16] ? src[15:0] : src[31:16])
	FI
	len := len / 2
	FOR j:= 0 to (len-1)
		i := j*16
		src[i+15:i] := (src[i+15:i] > src[i+16*len+15:i+16*len] ? src[i+15:i] : src[i+16*len+15:i+16*len])
	ENDFOR
	RETURN REDUCE_MAX(src[16*len-1:0], len)
}
tmp := a
FOR j := 0 to 7
	i := j*16
	IF k[j]
		tmp[i+15:i] := a[i+15:i]
	ELSE
		tmp[i+15:i] := Int16(-0x8000)
	FI
ENDFOR
dst[15:0] := REDUCE_MAX(tmp, 8)