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Source code

MOVLPD

Move Low Packed Double Precision Floating-Point Value

stableVMJITAOTinstruction

Encodings

OpcodeInstructionOp/En64-bitCompat/LegacyDescription
66 0F 12 /rMOVLPD xmm1, m64AValidValidMove double precision floating-point value from m64 to low quadword of xmm1.
VEX.128.66.0F.WIG 12 /rVMOVLPD xmm2, xmm1, m64BValidValidMerge double precision floating-point value from m64 and the high quadword of xmm1.
EVEX.128.66.0F.W1 12 /rVMOVLPD xmm2, xmm1, m64DValidValidMerge double precision floating-point value from m64 and OR AVX10.1 the high quadword of xmm1.
66 0F 13/rMOVLPD m64, xmm1CValidValidMove double precision floating-point value from low quadword of xmm1 to m64.
VEX.128.66.0F.WIG 13/rVMOVLPD m64, xmm1CValidValidMove double precision floating-point value from low quadword of xmm1 to m64.
EVEX.128.66.0F.W1 13/rVMOVLPD m64, xmm1EValidValidMove double precision floating-point value from low OR AVX10.1 quadword of xmm1 to m64.

Operand encoding

Each mode is a value of the Op/En column above. It says which field of the encoded instruction carries each operand, in the order they are written, and whether the instruction reads it, writes it or both.

A

  1. modrm.reg lectura y escrituraModRM byte, reg field (bits 5-3)
  2. modrm.rm lecturaModRM byte, r/m field (bits 2-0); with the SIB byte and the displacement when the mod field asks for them

B

  1. modrm.rm lecturaModRM byte, r/m field (bits 2-0); with the SIB byte and the displacement when the mod field asks for them
  2. vex.vvvv lecturaVEX prefix, vvvv field (inverted)
  3. modrm.rm lecturaModRM byte, r/m field (bits 2-0); with the SIB byte and the displacement when the mod field asks for them

C

  1. modrm.rm escrituraModRM byte, r/m field (bits 2-0); with the SIB byte and the displacement when the mod field asks for them
  2. modrm.reg lecturaModRM byte, reg field (bits 5-3)

D

  1. modrm.reg escrituraModRM byte, reg field (bits 5-3)
  2. evex.vvvv lecturaEVEX prefix, vvvv field (inverted)
  3. modrm.rm lecturaModRM byte, r/m field (bits 2-0); with the SIB byte and the displacement when the mod field asks for them

Tupla: Tuple1 Scalar

E

  1. modrm.rm escrituraModRM byte, r/m field (bits 2-0); with the SIB byte and the displacement when the mod field asks for them
  2. modrm.reg lecturaModRM byte, reg field (bits 5-3)

Tupla: Tuple1 Scalar

Measured cost

Loading measurements from arch-data...

Description

This instruction cannot be used for register to register or memory to memory moves.

128-bit Legacy SSE load:

Moves a double precision floating-point value from the source 64-bit memory operand and stores it in the low 64-bits of the destination XMM register. The upper 64bits of the XMM register are preserved. Bits (MAXVL-1:128) of the corresponding destination register are preserved.

VEX.128 & EVEX encoded load:

Loads a double precision floating-point value from the source 64-bit memory operand (third operand), merges it with the upper 64-bits of the first source XMM register (second operand), and stores it in the low 128-bits of the destination XMM register (first operand). Bits (MAXVL-1:128) of the corresponding destination register are zeroed.

128-bit store:

Stores a double precision floating-point value from the low 64-bits of the XMM register source (second operand) to the 64-bit memory location (first operand).

Note: VMOVLPD (store) (VEX.128.66.0F 13 /r) is legal and has the same behavior as the existing 66 0F 13 store. For VMOVLPD (store) VEX.vvvv and EVEX.vvvv are reserved and must be 1111b otherwise instruction will #UD.

If VMOVLPD is encoded with VEX.L or EVEX.L'L= 1, an attempt to execute the instruction encoded with VEX.L or EVEX.L'L= 1 will cause an #UD exception.

Operation

MOVLPD (128-bit Legacy SSE Load)
DEST[63:0] := SRC[63:0]
DEST[MAXVL-1:64] (Unmodified)


VMOVLPD (VEX.128 & EVEX Encoded Load)
DEST[63:0] := SRC2[63:0]
DEST[127:64] := SRC1[127:64]
DEST[MAXVL-1:128] := 0

VMOVLPD (Store)
DEST[63:0] := SRC[63:0]

Intel C/C++ compiler intrinsics

MOVLPD __m128d _mm_loadl_pd ( __m128d a, double *p) MOVLPD void _mm_storel_pd (double *p, __m128d a);

SIMD Floating-Point Exceptions

None.

Other Exceptions

Non-EVEX-encoded instruction, see Table 2-22, "Type 5 Class Exception Conditions," additionally:

#UD               If VEX.L = 1.

EVEX-encoded instruction, see Table 2-59, "Type E9NF Class Exception Conditions."

Sources