Intel 253666-024US - Manual (Page 750)

3-704 Vol. 2A MULSD—Multiply Scalar Double-Precision Floating-Point Values
INSTRUCTION SET REFERENCE, A-M
MULSD—Multiply Scalar Double-Precision Floating-Point Values
Description
Multiplies the low double-precision floating-point value in the source operand
(second operand) by the low double-precision floating-point value in the destination
operand (first operand), and stores the double-precision floating-point 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 desti-
nation 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).
Operation
DEST[63:0] ← DEST[63:0] * xmm2/m64[63:0];
(* DEST[127:64] unchanged *)
Intel C/C++ Compiler Intrinsic Equivalent
MULSD __m128d _mm_mul_sd (m128d a, m128d b)
SIMD Floating-Point Exceptions
Overflow, Underflow, Invalid, Precision, Denormal.
Protected Mode Exceptions
#GP(0) For an illegal memory operand effective address in the CS, DS,
ES, FS or GS segments.
#SS(0) For an illegal address in the SS segment.
#PF(fault-code) For a page fault.
#NM If CR0.TS[bit 3] = 1.
#XM If an unmasked SIMD floating-point exception and CR4.OSXM-
MEXCPT[bit 10] = 1.
Opcode Instruction 64-Bit
Mode
Compat/
Leg Mode
Description
F2 0F 59 /r MULSD xmm1,
xmm2/m64
Valid Valid Multiply the low double-precision
floating-point value in xmm2/mem64
by low double-precision floating-point
value in xmm1.