MOVSD
Move or Merge Scalar Double Precision Floating
| Opcode/Instruction | Op / En | 64/32 bit Mode Support | CPUID Feature Flag | Description |
|---|---|---|---|---|
| F2 0F 10 /r MOVSD xmm1, xmm2 | A | V/V | SSE2 | Move scalar double precision floating-point value from xmm2 to xmm1 register. |
| F2 0F 10 /r MOVSD xmm1, m64 | A | V/V | SSE2 | Load scalar double precision floating-point value from m64 to xmm1 register. |
| F2 0F 11 /r MOVSD xmm1/m64, xmm2 | C | V/V | SSE2 | Move scalar double precision floating-point value from xmm2 register to xmm1/m64. |
| VEX.LIG.F2.0F.WIG 10 /r VMOVSD xmm1, xmm2, xmm3 | B | V/V | AVX | Merge scalar double precision floating-point value from xmm2 and xmm3 to xmm1 register. |
| VEX.LIG.F2.0F.WIG 10 /r VMOVSD xmm1, m64 | D | V/V | AVX | Load scalar double precision floating-point value from m64 to xmm1 register. |
| VEX.LIG.F2.0F.WIG 11 /r VMOVSD xmm1, xmm2, xmm3 | E | V/V | AVX | Merge scalar double precision floating-point value from xmm2 and xmm3 registers to xmm1. |
| VEX.LIG.F2.0F.WIG 11 /r VMOVSD m64, xmm1 | C | V/V | AVX | Store scalar double precision floating-point value from xmm1 register to m64. |
| EVEX.LLIG.F2.0F.W1 10 /r VMOVSD xmm1 {k1}{z}, xmm2, xmm3 | B | V/V | AVX512F | Merge scalar double precision floating-point value from xmm2 and xmm3 registers to xmm1 under writemask k1. |
| EVEX.LLIG.F2.0F.W1 10 /r VMOVSD xmm1 {k1}{z}, m64 | F | V/V | AVX512F | Load scalar double precision floating-point value from m64 to xmm1 register under writemask k1. |
| EVEX.LLIG.F2.0F.W1 11 /r VMOVSD xmm1 {k1}{z}, xmm2, xmm3 | E | V/V | AVX512F | Merge scalar double precision floating-point value from xmm2 and xmm3 registers to xmm1 under writemask k1. |
| EVEX.LLIG.F2.0F.W1 11 /r VMOVSD m64 {k1}, xmm1 | G | V/V | AVX512F | Store scalar double precision floating-point value from xmm1 register to m64 under writemask k1. |
Instruction Operand Encoding
| Op/En | Tuple Type | Operand 1 | Operand 2 | Operand 3 | Operand 4 |
|---|---|---|---|---|---|
| A | N/A | ModRM:reg (r, w) | ModRM:r/m (r) | N/A | N/A |
| B | N/A | ModRM:reg (w) | VEX.vvvv (r) | ModRM:r/m (r) | N/A |
| C | N/A | ModRM:r/m (w) | ModRM:reg (r) | N/A | N/A |
| D | N/A | ModRM:reg (w) | ModRM:r/m (r) | N/A | N/A |
| E | N/A | ModRM:r/m (w) | EVEX.vvvv (r) | ModRM:reg (r) | N/A |
| F | Tuple1 Scalar | ModRM:reg (r, w) | ModRM:r/m (r) | N/A | N/A |
| G | Tuple1 Scalar | ModRM:r/m (w) | ModRM:reg (r) | N/A | N/A |
Description
Moves a scalar double precision floating-point value from the source operand (second operand) to the destination operand (first operand). The source and destination operands can be XMM registers or 64-bit memory locations. This instruction can be used to move a double precision floating-point value to and from the low quadword of an XMM register and a 64-bit memory location, or to move a double precision floating-point value between the low quadwords of two XMM registers. The instruction cannot be used to transfer data between memory locations.
Legacy version: When the source and destination operands are XMM registers, bits MAXVL:64 of the destination operand remains unchanged. When the source operand is a memory location and destination operand is an XMM
registers, the quadword at bits 127:64 of the destination operand is cleared to all 0s, bits MAXVL:128 of the destination operand remains unchanged.
VEX and EVEX encoded register-register syntax: Moves a scalar double precision floating-point value from the second source operand (the third operand) to the low quadword element of the destination operand (the first operand). Bits 127:64 of the destination operand are copied from the first source operand (the second operand). Bits (MAXVL-1:128) of the corresponding destination register are zeroed.
VEX and EVEX encoded memory store syntax: When the source operand is a memory location and destination operand is an XMM registers, bits MAXVL:64 of the destination operand is cleared to all 0s.
EVEX encoded versions: The low quadword of the destination is updated according to the writemask.
Note: For VMOVSD (memory store and load forms), VEX.vvvv and EVEX.vvvv are reserved and must be 1111b, otherwise instruction will #UD.
Operation
VMOVSD (EVEX.LLIG.F2.0F 10 /r: VMOVSD xmm1, m64 With Support for 32 Registers)
IF k1[0] or *no writemask*
THEN DEST[63:0] := SRC[63:0]
ELSE
IF *merging-masking* ; merging-masking
THEN *DEST[63:0] remains unchanged*
ELSE ; zeroing-masking
THEN DEST[63:0] := 0
FI;
FI;
DEST[MAXVL-1:64] := 0
VMOVSD (EVEX.LLIG.F2.0F 11 /r: VMOVSD m64, xmm1 With Support for 32 Registers)
IF k1[0] or *no writemask*
THEN DEST[63:0] := SRC[63:0]
ELSE *DEST[63:0] remains unchanged* ; merging-masking
FI;
VMOVSD (EVEX.LLIG.F2.0F 11 /r: VMOVSD xmm1, xmm2, xmm3)
IF k1[0] or *no writemask*
THEN DEST[63:0] := SRC2[63:0]
ELSE
IF *merging-masking* ; merging-masking
THEN *DEST[63:0] remains unchanged*
ELSE ; zeroing-masking
THEN DEST[63:0] := 0
FI;
FI;
DEST[127:64] := SRC1[127:64]
DEST[MAXVL-1:128] := 0
MOVSD (128-bit Legacy SSE Version: MOVSD xmm1, xmm2)
DEST[63:0] := SRC[63:0]
DEST[MAXVL-1:64] (Unmodified)
VMOVSD (VEX.128.F2.0F 11 /r: VMOVSD xmm1, xmm2, xmm3)
DEST[63:0] := SRC2[63:0]
DEST[127:64] := SRC1[127:64]
DEST[MAXVL-1:128] := 0
VMOVSD (VEX.128.F2.0F 10 /r: VMOVSD xmm1, xmm2, xmm3)
DEST[63:0] := SRC2[63:0]
DEST[127:64] := SRC1[127:64]
DEST[MAXVL-1:128] := 0
VMOVSD (VEX.128.F2.0F 10 /r: VMOVSD xmm1, m64)
DEST[63:0] := SRC[63:0]
DEST[MAXVL-1:64] := 0
MOVSD/VMOVSD (128-bit Versions: MOVSD m64, xmm1 or VMOVSD m64, xmm1)
DEST[63:0] := SRC[63:0]
MOVSD (128-bit Legacy SSE Version: MOVSD xmm1, m64)
DEST[63:0] := SRC[63:0]
DEST[127:64] := 0
DEST[MAXVL-1:128] (Unmodified)
Intel C/C++ Compiler Intrinsic Equivalent
VMOVSD __m128d _mm_mask_load_sd(__m128d s, __mmask8 k, double * p);
VMOVSD __m128d _mm_maskz_load_sd( __mmask8 k, double * p);
VMOVSD __m128d _mm_mask_move_sd(__m128d sh, __mmask8 k, __m128d sl, __m128d a);
VMOVSD __m128d _mm_maskz_move_sd( __mmask8 k, __m128d s, __m128d a);
VMOVSD void _mm_mask_store_sd(double * p, __mmask8 k, __m128d s);
MOVSD __m128d _mm_load_sd (double *p)
MOVSD void _mm_store_sd (double *p, __m128d a)
MOVSD __m128d _mm_move_sd ( __m128d a, __m128d b)
SIMD Floating-Point Exceptions
None.
Other Exceptions
Non-EVEX-encoded instruction, see Table 2-22, “Type 5 Class Exception Conditions,” additionally:
| #UD | If VEX.vvvv != 1111B. |
|---|
EVEX-encoded instruction, see Table 2-58, “Type E10 Class Exception Conditions.”
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.