SUBPD (Subtract Packed Double-Precision Floating-Point Values)

Opcodes

Opcode/Instruction Op/En 64/32 bit Mode Support CPUID Feature Flag Description
66 0F 5C /r SUBPD xmm1, xmm2/m128 RM V/V SSE2 Subtract packed double-precision floating-point values in xmm2/m128 from xmm1.
VEX.NDS.128.66.0F.WIG 5C /r VSUBPD xmm1,xmm2, xmm3/m128 RVM V/V AVX Subtract packed double-precision floating-point values in xmm3/mem from xmm2 and stores result in xmm1.
VEX.NDS.256.66.0F.WIG 5C /r VSUBPD ymm1, ymm2, ymm3/m256 RVM V/V AVX Subtract packed double-precision floating-point values in ymm3/mem from 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 subtract of the two packed double-precision floating-point values in the source operand (second operand) from the two packed double-precision floating-point values in the destination operand (first operand), and stores the packed double-precision floating-point results in the destination operand. The source operand can be an XMM register or a 128-bit memory location. The destination operand is an XMM register. See Figure 11-3 in the Intel® 64 and IA-32 Architectures Software Developer’s Manual, Volume 1, for an illustration of a SIMD double-precision floating-point operation.

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: T second source can be an XMM register or an 128-bit memory location. The destina-tion is not distinct from the first source XMM register and the upper bits (VLMAX-1:128) of the corresponding YMM register destination are unmodified.

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

SUBPD (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)

VSUBPD (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

VSUBPD (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

SUBPD:

__m128d _mm_sub_pd (m128d a, m128d b)

VSUBPD:

__m256d _mm256_sub_pd (__m256d a, __m256d b);

SIMD Floating-Point Exceptions

Overflow, Underflow, Invalid, Precision, Denormal.

Other Exceptions

See Exceptions Type 2.