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3-698 Vol. 2A MULPD—Multiply Packed Double-Precision Floating-Point Values
INSTRUCTION SET REFERENCE, A-M
MULPD—Multiply Packed Double-Precision Floating-Point Values
Description
Performs a SIMD multiply 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 desti-
nation 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 illustra-
tion of a SIMD 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] ∗ SRC[63:0];
DEST[127:64] ← DEST[127:64]
∗ SRC[127:64];
Intel C/C++ Compiler Intrinsic Equivalent
MULPD __m128d _mm_mul_pd (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.
If a memory operand is not aligned on a 16-byte boundary,
regardless of segment.
#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
66 0F 59 /r MULPD xmm1,
xmm2/m128
Valid Valid Multiply packed double-precision
floating-point values in xmm2/m128 by
xmm1.