movapd

Move Aligned Packed Double-Precision

MOVAPD xmm, xmm/m128

Moves 128-bit packed double data (Must be 16-byte aligned).

Details

Moves 128 bits of aligned packed double-precision floating-point data from source to destination XMM register. Memory operand must be 16-byte aligned; unaligned access generates #GP(0). Does not affect any flags; operates only on XMM state.

Pseudocode Operation

dest[127:0] ← src[127:0]

Example

MOVAPD xmm0, xmm1

Encoding

Binary Layout
66
+0
0F
+1
28
+2
 
Format SSE2
Opcode 66 0F 28
Extension SSE2

Operands

  • dest
    128-bit SSE/AVX register (XMM)
  • src
    128-bit XMM register or 128-bit memory

Reference (Intel® SDM)

Instruction Forms

Opcode Instruction Op/En 64/32-bit Mode CPUID Description
66 0F 28 /r MOVAPD xmm1, xmm2/m128 A V/V SSE2 Move aligned packed double precision floatingpoint values from xmm2/mem to xmm1.
66 0F 29 /r MOVAPD xmm2/m128, xmm1 B V/V SSE2 Move aligned packed double precision floatingpoint values from xmm1 to xmm2/mem.
VEX.128.66.0F.WIG 28 /r VMOVAPD xmm1, xmm2/m128 A V/V AVX Move aligned packed double precision floatingpoint values from xmm2/mem to xmm1.
VEX.128.66.0F.WIG 29 /r VMOVAPD xmm2/m128, xmm1 B V/V AVX Move aligned packed double precision floatingpoint values from xmm1 to xmm2/mem.
VEX.256.66.0F.WIG 28 /r VMOVAPD ymm1, ymm2/m256 A V/V AVX Move aligned packed double precision floatingpoint values from ymm2/mem to ymm1.
VEX.256.66.0F.WIG 29 /r VMOVAPD ymm2/m256, ymm1 B V/V AVX Move aligned packed double precision floatingpoint values from ymm1 to ymm2/mem.
EVEX.128.66.0F.W1 28 /r VMOVAPD xmm1 {k1}{z}, xmm2/m128 C V/V (AVX512VL AND AVX512F) OR AVX10.1 Move aligned packed double precision floatingpoint values from xmm2/m128 to xmm1 using writemask k1.
EVEX.256.66.0F.W1 28 /r VMOVAPD ymm1 {k1}{z}, ymm2/m256 C V/V (AVX512VL AND AVX512F) OR AVX10.1 Move aligned packed double precision floatingpoint values from ymm2/m256 to ymm1 using writemask k1.
EVEX.512.66.0F.W1 28 /r VMOVAPD zmm1 {k1}{z}, zmm2/m512 C V/V AVX512F OR AVX10.1 Move aligned packed double precision floatingpoint values from zmm2/m512 to zmm1 using writemask k1.
EVEX.128.66.0F.W1 29 /r VMOVAPD xmm2/m128 {k1}{z}, xmm1 D V/V (AVX512VL AND AVX512F) OR AVX10.1 Move aligned packed double precision floatingpoint values from xmm1 to xmm2/m128 using writemask k1.
EVEX.256.66.0F.W1 29 /r VMOVAPD ymm2/m256 {k1}{z}, ymm1 D V/V (AVX512VL AND AVX512F) OR AVX10.1 Move aligned packed double precision floatingpoint values from ymm1 to ymm2/m256 using writemask k1.
EVEX.512.66.0F.W1 29 /r VMOVAPD zmm2/m512 {k1}{z}, zmm1 D V/V AVX512F OR AVX10.1 Move aligned packed double precision floatingpoint values from zmm1 to zmm2/m512 using writemask k1.

Instruction Operand Encoding

Op/En Tuple Type Operand 1 Operand 2 Operand 3 Operand 4
A N/A ModRM:reg (w) ModRM:r/m (r) N/A N/A
B N/A ModRM:r/m (w) ModRM:reg (r) N/A N/A
C Full Mem ModRM:reg (w) ModRM:r/m (r) N/A N/A
D Full Mem ModRM:r/m (w) ModRM:reg (r) N/A N/A

Description

Moves 2, 4 or 8 double precision floating-point values from the source operand (second operand) to the destination operand (first operand). This instruction can be used to load an XMM, YMM or ZMM register from an 128-bit, 256bit or 512-bit memory location, to store the contents of an XMM, YMM or ZMM register into a 128-bit, 256-bit or 512-bit memory location, or to move data between two XMM, two YMM or two ZMM registers. When the source or destination operand is a memory operand, the operand must be aligned on a 16-byte (128-bit versions), 32-byte (256-bit version) or 64-byte (EVEX.512 encoded version) boundary or a general-protection MOVAPD—Move Aligned Packed Double Precision Floating-Point Values Vol. 2B 4-37 exception (#GP) will be generated. For EVEX encoded versions, the operand must be aligned to the size of the memory operand. To move double precision floating-point values to and from unaligned memory locations, use the VMOVUPD instruction. Note: VEX.vvvv and EVEX.vvvv are reserved and must be 1111b otherwise instructions will #UD. EVEX.512 encoded version: Moves 512 bits of packed double precision floating-point values from the source operand (second operand) to the destination operand (first operand). This instruction can be used to load a ZMM register from a 512-bit float64 memory location, to store the contents of a ZMM register into a 512-bit float64 memory location, or to move data between two ZMM registers. When the source or destination operand is a memory operand, the operand must be aligned on a 64-byte boundary or a general-protection exception (#GP) will be generated. To move single precision floating-point values to and from unaligned memory locations, use the VMOVUPD instruction. VEX.256 and EVEX.256 encoded versions: Moves 256 bits of packed double precision floating-point values from the source operand (second operand) to the destination operand (first operand). This instruction can be used to load a YMM register from a 256-bit memory location, to store the contents of a YMM register into a 256-bit memory location, or to move data between two YMM registers. When the source or destination operand is a memory operand, the operand must be aligned on a 32-byte boundary or a general-protection exception (#GP) will be generated. To move double precision floating-point values to and from unaligned memory locations, use the VMOVUPD instruction. 128-bit versions: Moves 128 bits of packed double precision floating-point values from the source operand (second operand) to the destination operand (first operand). This instruction can be used to load an XMM register from a 128-bit memory location, to store the contents of an XMM register into a 128-bit memory location, or to move data between two XMM registers. When the source or destination operand is a memory operand, the operand must be aligned on a 16-byte boundary or a general-protection exception (#GP) will be generated. To move single precision floatingpoint values to and from unaligned memory locations, use the VMOVUPD instruction. 128-bit Legacy SSE version: Bits (MAXVL-1:128) of the corresponding ZMM destination register remain unchanged. (E)VEX.128 encoded version: Bits (MAXVL-1:128) of the destination ZMM register destination are zeroed.

Operation

VMOVAPD (EVEX Encoded Versions, Register-Copy Form)
(KL, VL) = (2, 128), (4, 256), (8, 512)
FOR j := 0 TO KL-1
i := j * 64
IF k1[j] OR *no writemask*
THEN DEST[i+63:i] := SRC[i+63:i]
ELSE
IF *merging-masking*                                 ; merging-masking
THEN *DEST[i+63:i] remains unchanged*
ELSE DEST[i+63:i] := 0                     ; zeroing-masking
FI
FI;
ENDFOR
DEST[MAXVL-1:VL] := 0





MOVAPD—Move Aligned Packed Double Precision Floating-Point Values                                                                         Vol. 2B 4-38
VMOVAPD (EVEX Encoded Versions, Store-Form)
(KL, VL) = (2, 128), (4, 256), (8, 512)
FOR j := 0 TO KL-1
i := j * 64
IF k1[j] OR *no writemask*
THEN DEST[i+63:i] := SRC[i+63:i]
ELSE
ELSE *DEST[i+63:i] remains unchanged*               ; merging-masking

FI;
ENDFOR;

VMOVAPD (EVEX Encoded Versions, Load-Form)
(KL, VL) = (2, 128), (4, 256), (8, 512)
FOR j := 0 TO KL-1
i := j * 64
IF k1[j] OR *no writemask*
THEN DEST[i+63:i] := SRC[i+63:i]
ELSE
IF *merging-masking*                                 ; merging-masking
THEN *DEST[i+63:i] remains unchanged*
ELSE DEST[i+63:i] := 0                     ; zeroing-masking
FI
FI;
ENDFOR
DEST[MAXVL-1:VL] := 0

VMOVAPD (VEX.256 Encoded Version, Load - and Register Copy)
DEST[255:0] := SRC[255:0]
DEST[MAXVL-1:256] := 0

VMOVAPD (VEX.256 Encoded Version, Store-Form)
DEST[255:0] := SRC[255:0]

VMOVAPD (VEX.128 Encoded Version, Load - and Register Copy)
DEST[127:0] := SRC[127:0]
DEST[MAXVL-1:128] := 0

MOVAPD (128-bit Load- and Register-Copy- Form Legacy SSE Version)
DEST[127:0] := SRC[127:0]
DEST[MAXVL-1:128] (Unmodified)

(V)MOVAPD (128-bit Store-Form Version)
DEST[127:0] := SRC[127:0]





MOVAPD—Move Aligned Packed Double Precision Floating-Point Values                                                                         Vol. 2B 4-39

Intel C/C++ Compiler Intrinsic Equivalent

VMOVAPD __m512d _mm512_load_pd( void * m);
VMOVAPD __m512d _mm512_mask_load_pd(__m512d s, __mmask8 k, void * m);
VMOVAPD __m512d _mm512_maskz_load_pd( __mmask8 k, void * m);
VMOVAPD void _mm512_store_pd( void * d, __m512d a);
VMOVAPD void _mm512_mask_store_pd( void * d, __mmask8 k, __m512d a);
VMOVAPD __m256d _mm256_mask_load_pd(__m256d s, __mmask8 k, void * m);
VMOVAPD __m256d _mm256_maskz_load_pd( __mmask8 k, void * m);
VMOVAPD void _mm256_mask_store_pd( void * d, __mmask8 k, __m256d a);
VMOVAPD __m128d _mm_mask_load_pd(__m128d s, __mmask8 k, void * m);
VMOVAPD __m128d _mm_maskz_load_pd( __mmask8 k, void * m);
VMOVAPD void _mm_mask_store_pd( void * d, __mmask8 k, __m128d a);
MOVAPD __m256d _mm256_load_pd (double * p);
MOVAPD void _mm256_store_pd(double * p, __m256d a);
MOVAPD __m128d _mm_load_pd (double * p);
MOVAPD void _mm_store_pd(double * p, __m128d a);

Exceptions

SIMD Floating-Point Exceptions

None.

Other Exceptions

Non-EVEX-encoded instruction, see Exceptions Type1.SSE2 in Table 2-18, “Type 1 Class Exception Conditions.” EVEX-encoded instruction, see Table 2-46, “Type E1 Class Exception Conditions.” Additionally: #UD If EVEX.vvvv != 1111B or VEX.vvvv != 1111B. MOVAPD—Move Aligned Packed Double Precision Floating-Point Values Vol. 2B 4-40