ADDPD—Add Packed Double-Precision Floating-Point Values

Opcode/Instruction	Op/En	64/32-bit Mode	CPUID Feature Flag	Description
66 0F 58 /r ADDPD xmm1, xmm2/m128	RM	V/V	SSE2	Add packed double-precision floating-point values from xmm2/m128 to xmm1.
VEX.NDS.128.66.0F.WIG 58 /r VADDPD xmm1,xmm2, xmm3/m128	RVM	V/V	AVX	Add packed double-precision floating-point values from xmm3/mem to xmm2 and stores result in xmm1.
VEX.NDS.256.66.0F.WIG 58 /r VADDPD ymm1, ymm2, ymm3/m256	RVM	V/V	AVX	Add packed double-precision floating-point values from ymm3/mem to ymm2 and stores result in ymm1.

Opcode/Instruction

Op/En

64/32-bit Mode

CPUID Feature Flag

Description

66 0F 58 /r

ADDPD xmm1, xmm2/m128

V/V

SSE2

Add packed double-precision floating-point values from xmm2/m128 to xmm1.

VEX.NDS.128.66.0F.WIG 58 /r

VADDPD xmm1,xmm2, xmm3/m128

RVM

V/V

AVX

Add packed double-precision floating-point values from xmm3/mem to xmm2 and stores result in xmm1.

VEX.NDS.256.66.0F.WIG 58 /r

VADDPD ymm1, ymm2, ymm3/m256

RVM

V/V

AVX

Add packed double-precision floating-point values from ymm3/mem to ymm2 and stores result in ymm1.

Instruction Operand Encoding

Op/En	Operand 1	Operand 2	Operand 3	Operand 4
RM	ModRM:reg (r, w)	ModRM:r/m (r)	NA	NA
RVM	ModRM:reg (w)	VEX.vvvv (r)	ModRM:r/m (r)	NA

Description

Performs a SIMD add of the two packed double-precision floating-point values from the source operand (second operand) and the destination operand (first operand), and stores the packed double-precision floating-point results in the destination operand.

In 64-bit mode, using a REX prefix in the form of REX.R permits this instruction to access additional registers (XMM8-XMM15).

128-bit Legacy SSE version: The second source can be an XMM register or an 128-bit memory location. The desti-nation is not distinct from the first source XMM register and the upper bits (VLMAX-1:128) of the corresponding YMM register destination are unmodified. See Chapter 11 in the Intel® 64 and IA-32 Architectures Software Devel-oper’s Manual, Volume 1, for an overview of SIMD double-precision floating-point operation.

VEX.128 encoded version: the first source operand is an XMM register or 128-bit memory location. The destination operand is an XMM register. The upper bits (VLMAX-1:128) of the corresponding YMM register destination are zeroed.

VEX.256 encoded version: The first source operand is a YMM register. The second source operand can be a YMM register or a 256-bit memory location. The destination operand is a YMM register.

Operation

ADDPD (128-bit Legacy SSE version)

DEST[63:0] ← DEST[63:0] + SRC[63:0];
DEST[127:64] ← DEST[127:64] + SRC[127:64];
DEST[VLMAX-1:128] (Unmodified)

VADDPD (VEX.128 encoded version)

DEST[63:0] ← SRC1[63:0] + SRC2[63:0]
DEST[127:64] ← SRC1[127:64] + SRC2[127:64]
DEST[VLMAX-1:128] ← 0

VADDPD (VEX.256 encoded version)

DEST[63:0] ← SRC1[63:0] + SRC2[63:0]
DEST[127:64] ← SRC1[127:64] + SRC2[127:64]
DEST[191:128] ← SRC1[191:128] + SRC2[191:128]
DEST[255:192] ← SRC1[255:192] + SRC2[255:192]

Intel C/C++ Compiler Intrinsic Equivalent

ADDPD:

__m128d _mm_add_pd (__m128d a, __m128d b)

VADDPD:

__m256d _mm256_add_pd (__m256d a, __m256d b)

SIMD Floating-Point Exceptions

Overflow, Underflow, Invalid, Precision, Denormal.

Other Exceptions

See Exceptions Type 2.