_mm_maskz_permutevar_ps
Classification
AVX-512, Miscellaneous, CPUID Test: AVX512F
Header File
immintrin.h
Instruction
VPERMILPS xmm {z}, xmm, xmm
Synopsis
 _mm_maskz_permutevar_ps(__mmask8 k, __m128 a, __m128i b);
Description
Shuffle single-precision (32-bit) floating-point elements in "a" using the control in "b", and store the results in "dst" using zeromask "k" (elements are zeroed out when the corresponding mask bit is not set).
Operation
DEFINE SELECT4(src, control) {
	CASE(control[1:0]) OF
	0:	tmp[31:0] := src[31:0]
	1:	tmp[31:0] := src[63:32]
	2:	tmp[31:0] := src[95:64]
	3:	tmp[31:0] := src[127:96]
	ESAC
	RETURN tmp[31:0]
}
tmp_dst[31:0] := SELECT4(a[127:0], b[1:0])
tmp_dst[63:32] := SELECT4(a[127:0], b[33:32])
tmp_dst[95:64] := SELECT4(a[127:0], b[65:64])
tmp_dst[127:96] := SELECT4(a[127:0], b[97:96])
FOR j := 0 to 3
	i := j*32
	IF k[j]
		dst[i+31:i] := tmp_dst[i+31:i]
	ELSE
		dst[i+31:i] := 0
	FI
ENDFOR
dst[MAX:128] := 0