| Opcode/Instruction | Op/En | 64/32-bit Mode | CPUID Feature Flag | Description |
| F2 0F 59 /r MULSD xmm1, xmm2/m64 | RM | V/V | SSE2 | Multiply the low double-precision floatingpoint value in xmm2/mem64 by low doubleprecision floating-point value in xmm1. |
| VEX.NDS.LIG.F2.0F.WIG 59/r VMULSD xmm1,xmm2, xmm3/m64 | RVM | V/V | AVX | Multiply the low double-precision floatingpoint value in xmm3/mem64 by low double precision floating-point value in xmm2. |
| 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 |
Multiplies the low double-precision floating-point value in the source operand (second operand) by the low doubleprecision floating-point value in the destination operand (first operand), and stores the double-precision floatingpoint result in the destination operand. The source operand can be an XMM register or a 64-bit memory location. The destination operand is an XMM register. The high quadword of the destination operand remains unchanged. See Figure 11-4 in the Intel® 64 and IA-32 Architectures Software Developer’s Manual, Volume 1, for an illustration of a scalar double-precision floating-point operation.
In 64-bit mode, use of the REX.R prefix permits this instruction to access additional registers (XMM8-XMM15). 128-bit Legacy SSE version: The first source operand and the destination operand are the same. Bits (VLMAX1:64) of the corresponding YMM destination register remain unchanged. VEX.128 encoded version: Bits (VLMAX-1:128) of the destination YMM register are zeroed.
MULSD (128-bit Legacy SSE version) DEST[63:0] ← DEST[63:0] * SRC[63:0] DEST[VLMAX-1:64] (Unmodified) VMULSD (VEX.128 encoded version) DEST[63:0] ← SRC1[63:0] * SRC2[63:0] DEST[127:64] ← SRC1[127:64] DEST[VLMAX-1:128] ← 0
| MULSD: | __m128d _mm_mul_sd (m128d a, m128d b) |
Overflow, Underflow, Invalid, Precision, Denormal.
See Exceptions Type 3