|Opcode/Instruction||Op/En||64/32-bit Mode||CPUID Feature Flag||Description|
66 0F 50 /r
MOVMSKPD reg, xmm
|RM||V/V||SSE2||Extract 2-bit sign mask from xmm and store in reg. The upper bits of r32 or r64 are filled with zeros.|
VEX.128.66.0F.WIG 50 /r
VMOVMSKPD reg, xmm2
|RM||V/V||AVX||Extract 2-bit sign mask from xmm2 and store in reg. The upper bits of r32 or r64 are zeroed.|
VEX.256.66.0F.WIG 50 /r
VMOVMSKPD reg, ymm2
|RM||V/V||AVX||Extract 4-bit sign mask from ymm2 and store in reg. The upper bits of r32 or r64 are zeroed.|
|Op/En||Operand 1||Operand 2||Operand 3||Operand 4|
|RM||ModRM:reg (w)||ModRM:r/m (r)||NA||NA|
Extracts the sign bits from the packed double-precision floating-point values in the source operand (second operand), formats them into a 2-bit mask, and stores the mask in the destination operand (first operand). The source operand is an XMM register, and the destination operand is a general-purpose register. The mask is stored in the 2 low-order bits of the destination operand. Zero-extend the upper bits of the destination.
In 64-bit mode, the instruction can access additional registers (XMM8-XMM15, R8-R15) when used with a REX.R prefix. The default operand size is 64-bit in 64-bit mode.
128-bit versions: The source operand is a YMM register. The destination operand is a general purpose register.
VEX.256 encoded version: The source operand is a YMM register. The destination operand is a general purpose register.
Note: In VEX-encoded versions, VEX.vvvv is reserved and must be 1111b, otherwise instructions will #UD.
(V)MOVMSKPD (128-bit versions)
DEST := SRC DEST := SRC IF DEST = r32 THEN DEST[31:2] := 0; ELSE DEST[63:2] := 0; FI
VMOVMSKPD (VEX.256 encoded version)
DEST := SRC DEST := SRC DEST := SRC DEST := SRC IF DEST = r32 THEN DEST[31:4] := 0; ELSE DEST[63:4] := 0; FI
int _mm_movemask_pd ( __m128d a)
See Table 2-24, “Type 7 Class Exception Conditions”; additionally:
|#UD||If VEX.vvvv ≠ 1111B.|