MOVMSKPD
Extract Packed Double Precision Floating
| 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. |
Instruction Operand Encoding
| Op/En | Operand 1 | Operand 2 | Operand 3 | Operand 4 |
|---|---|---|---|---|
| RM | ModRM:reg (w) | ModRM:r/m (r) | N/A | N/A |
Description
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.
Operation
(V)MOVMSKPD (128-bit Versions)
DEST[0] := SRC[63]
DEST[1] := SRC[127]
IF DEST = r32
THEN DEST[31:2] := 0;
ELSE DEST[63:2] := 0;
FI
VMOVMSKPD (VEX.256 Encoded Version)
DEST[0] := SRC[63]
DEST[1] := SRC[127]
DEST[2] := SRC[191]
DEST[3] := SRC[255]
IF DEST = r32
THEN DEST[31:4] := 0;
ELSE DEST[63:4] := 0;
FI
Intel C/C++ Compiler Intrinsic Equivalent
MOVMSKPD int _mm_movemask_pd ( __m128d a)
VMOVMSKPD _mm256_movemask_pd(__m256d a)
SIMD Floating-Point Exceptions
None.
Other Exceptions
See Table 2-24, “Type 7 Class Exception Conditions,” additionally:
| #UD | If VEX.vvvv ≠ 1111B. |
|---|
This UNOFFICIAL, mechanically-separated, non-verified reference is provided for convenience, but it may be incomplete or broken in various obvious or non-obvious ways. Refer to Intel® 64 and IA-32 Architectures Software Developer’s Manual for anything serious.