movaps

Move Aligned Packed Single-Precision

MOVAPS xmm, xmm/m128

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

Details

Moves 128 bits of packed single-precision floating-point data between XMM registers or between an XMM register and 16-byte aligned memory. The memory operand must be 16-byte aligned; unaligned memory access results in a general-protection exception (#GP). This is a cache-efficient operation for aligned data. No flags are affected. Supported in SSE and later extensions.

Pseudocode Operation

xmm_dest[0:127] ← xmm/m128[0:127];

Example

MOVAPS xmm0, xmm1

Encoding

Binary Layout
0F
+0
28
+1
 
Format SSE
Opcode NP 0F 28 /r
Extension SSE

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
NP 0F 28 /r MOVAPS xmm1, xmm2/m128 A V/V SSE Move aligned packed single precision floating-point values from xmm2/mem to xmm1.
NP 0F 29 /r MOVAPS xmm2/m128, xmm1 B V/V SSE Move aligned packed single precision floating-point values from xmm1 to xmm2/mem.
VEX.128.0F.WIG 28 /r VMOVAPS xmm1, xmm2/m128 A V/V AVX Move aligned packed single precision floating-point values from xmm2/mem to xmm1.
VEX.128.0F.WIG 29 /r VMOVAPS xmm2/m128, xmm1 B V/V AVX Move aligned packed single precision floating-point values from xmm1 to xmm2/mem.
VEX.256.0F.WIG 28 /r VMOVAPS ymm1, ymm2/m256 A V/V AVX Move aligned packed single precision floating-point values from ymm2/mem to ymm1.
VEX.256.0F.WIG 29 /r VMOVAPS ymm2/m256, ymm1 B V/V AVX Move aligned packed single precision floating-point values from ymm1 to ymm2/mem.
EVEX.128.0F.W0 28 /r VMOVAPS xmm1 {k1}{z}, xmm2/m128 C V/V (AVX512VL AND AVX512F) OR AVX10.1 Move aligned packed single precision floating-point values from xmm2/m128 to xmm1 using writemask k1.
EVEX.256.0F.W0 28 /r VMOVAPS ymm1 {k1}{z}, ymm2/m256 C V/V (AVX512VL AND AVX512F) OR AVX10.1 Move aligned packed single precision floating-point values from ymm2/m256 to ymm1 using writemask k1.
EVEX.512.0F.W0 28 /r VMOVAPS zmm1 {k1}{z}, zmm2/m512 C V/V AVX512F OR AVX10.1 Move aligned packed single precision floating-point values from zmm2/m512 to zmm1 using writemask k1.
EVEX.128.0F.W0 29 /r VMOVAPS xmm2/m128 {k1}{z}, xmm1 D V/V (AVX512VL AND AVX512F) OR AVX10.1 Move aligned packed single precision floating-point values from xmm1 to xmm2/m128 using writemask k1.
EVEX.256.0F.W0 29 /r VMOVAPS ymm2/m256 {k1}{z}, ymm1 D V/V (AVX512VL AND AVX512F) OR AVX10.1 Move aligned packed single precision floating-point values from ymm1 to ymm2/m256 using writemask k1.
EVEX.512.0F.W0 29 /r VMOVAPS zmm2/m512 {k1}{z}, zmm1 D V/V AVX512F OR AVX10.1 Move aligned packed single precision floating-point 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 4, 8 or 16 single 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 version), 32-byte (VEX.256 encoded version) or 64-byte (EVEX.512 encoded version) boundary or a general MOVAPS—Move Aligned Packed Single Precision Floating-Point Values Vol. 2B 4-41 protection exception (#GP) will be generated. For EVEX.512 encoded versions, the operand must be aligned to the size of the memory operand. To move single precision floating-point values to and from unaligned memory locations, use the VMOVUPS 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 single 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 float32 memory location, to store the contents of a ZMM register into a float32 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 floatingpoint values to and from unaligned memory locations, use the VMOVUPS instruction. VEX.256 and EVEX.256 encoded version: Moves 256 bits of packed single 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. 128-bit versions: Moves 128 bits of packed single 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 VMOVUPS 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 are zeroed.

Operation

VMOVAPS (EVEX Encoded Versions, Register-Copy Form)
(KL, VL) = (4, 128), (8, 256), (16, 512)
FOR j := 0 TO KL-1
i := j * 32
IF k1[j] OR *no writemask*
THEN DEST[i+31:i] := SRC[i+31:i]
ELSE
IF *merging-masking*                                 ; merging-masking
THEN *DEST[i+31:i] remains unchanged*
ELSE DEST[i+31:i] := 0                     ; zeroing-masking
FI
FI;
ENDFOR
DEST[MAXVL-1:VL] := 0





MOVAPS—Move Aligned Packed Single Precision Floating-Point Values                                                                          Vol. 2B 4-42
VMOVAPS (EVEX Encoded Versions, Store Form)
(KL, VL) = (4, 128), (8, 256), (16, 512)
FOR j := 0 TO KL-1
i := j * 32
IF k1[j] OR *no writemask*
THEN DEST[i+31:i] :=
SRC[i+31:i]
ELSE *DEST[i+31:i] remains unchanged*               ; merging-masking
FI;
ENDFOR;

VMOVAPS (EVEX Encoded Versions, Load Form)
(KL, VL) = (4, 128), (8, 256), (16, 512)
FOR j := 0 TO KL-1
i := j * 32
IF k1[j] OR *no writemask*
THEN DEST[i+31:i] := SRC[i+31:i]
ELSE
IF *merging-masking*                                 ; merging-masking
THEN *DEST[i+31:i] remains unchanged*
ELSE DEST[i+31:i] := 0                     ; zeroing-masking
FI
FI;
ENDFOR
DEST[MAXVL-1:VL] := 0

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

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

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

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

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





MOVAPS—Move Aligned Packed Single Precision Floating-Point Values                                                                          Vol. 2B 4-43

Intel C/C++ Compiler Intrinsic Equivalent

VMOVAPS __m512 _mm512_load_ps( void * m);
VMOVAPS __m512 _mm512_mask_load_ps(__m512 s, __mmask16 k, void * m);
VMOVAPS __m512 _mm512_maskz_load_ps( __mmask16 k, void * m);
VMOVAPS void _mm512_store_ps( void * d, __m512 a);
VMOVAPS void _mm512_mask_store_ps( void * d, __mmask16 k, __m512 a);
VMOVAPS __m256 _mm256_mask_load_ps(__m256 a, __mmask8 k, void * s);
VMOVAPS __m256 _mm256_maskz_load_ps( __mmask8 k, void * s);
VMOVAPS void _mm256_mask_store_ps( void * d, __mmask8 k, __m256 a);
VMOVAPS __m128 _mm_mask_load_ps(__m128 a, __mmask8 k, void * s);
VMOVAPS __m128 _mm_maskz_load_ps( __mmask8 k, void * s);
VMOVAPS void _mm_mask_store_ps( void * d, __mmask8 k, __m128 a);
MOVAPS __m256 _mm256_load_ps (float * p);
MOVAPS void _mm256_store_ps(float * p, __m256 a);
MOVAPS __m128 _mm_load_ps (float * p);
MOVAPS void _mm_store_ps(float * p, __m128 a);

Exceptions

SIMD Floating-Point Exceptions

None.

Other Exceptions

Non-EVEX-encoded instruction, see Exceptions Type1.SSE in Table 2-18, “Type 1 Class Exception Conditions,” additionally: #UD If VEX.vvvv != 1111B. EVEX-encoded instruction, see Table 2-46, “Type E1 Class Exception Conditions.” MOVAPS—Move Aligned Packed Single Precision Floating-Point Values Vol. 2B 4-44