ADDSUBPD (Packed Double-FP Add/Subtract)

Opcodes

Opcode/Instruction Op/En 64/32-bit Mode CPUID Feature Flag Description
66 0F D0 /r ADDSUBPD xmm1, xmm2/m128 RM V/V SSE3 Add/subtract double-precision floating-point values from xmm2/m128 to xmm1.
VEX.NDS.128.66.0F.WIG D0 /r VADDSUBPD xmm1, xmm2, xmm3/m128 RVM V/V AVX Add/subtract packed double-precision floating-point values from xmm3/mem to xmm2 and stores result in xmm1.
VEX.NDS.256.66.0F.WIG D0 /r VADDSUBPD ymm1, ymm2, ymm3/m256 RVM V/V AVX Add / subtract 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

Adds odd-numbered double-precision floating-point values of the first source operand (second operand) with the corresponding double-precision floating-point values from the second source operand (third operand); stores the result in the odd-numbered values of the destination operand (first operand). Subtracts the even-numbered double-precision floating-point values from the second source operand from the corresponding double-precision floating values in the first source operand; stores the result into the even-numbered values of 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 Figure 3-3.

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.

Figure 3-3. ADDSUBPD—Packed Double-FP Add/Subtract

Operation

ADDSUBPD (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)

VADDSUBPD (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

VADDSUBPD (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

ADDSUBPD:

__m128d _mm_addsub_pd(__m128d a, __m128d b)

VADDSUBPD:

__m256d _mm256_addsub_pd (__m256d a, __m256d b)

Exceptions

When the source operand is a memory operand, it must be aligned on a 16-byte boundary or a general-protection exception (#GP) will be generated.

SIMD Floating-Point Exceptions

Overflow, Underflow, Invalid, Precision, Denormal.

Other Exceptions

See Exceptions Type 2.