_mm512_mask_reduce_max_ps
Classification
AVX-512, Special Math Functions, CPUID Test: AVX512F
Header File
immintrin.h
Synopsis
 _mm512_mask_reduce_max_ps(__mmask16 k, __m512 a);
Description
Reduce the packed single-precision (32-bit) floating-point elements 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[31:0] > src[63:32] ? 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] ? src[i+31:i] : src[i+32*len+31:i+32*len])
	ENDFOR
	RETURN REDUCE_MAX(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] := Cast_FP32(0xFF7FFFFF)
	FI
ENDFOR
dst[31:0] := REDUCE_MAX(tmp, 16)