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3-274 Vol. 2A DIVSD—Divide Scalar Double-Precision Floating-Point Values
INSTRUCTION SET REFERENCE, A-M
DIVSD—Divide Scalar Double-Precision Floating-Point Values
Description
Divides the low double-precision floating-point value in the destination operand (first
operand) by the low double-precision floating-point value in the source operand
(second operand), and stores the double-precision floating-point result in the desti-
nation 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 Chapter 11 in the Intel® 64 and IA-32
Architectures Software Developer’s Manual, Volume 1, for an overview 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] / SRC[63:0];
(* DEST[127:64] unchanged *)
Intel C/C++ Compiler Intrinsic Equivalent
DIVSD __m128d _mm_div_sd (m128d a, m128d b)
SIMD Floating-Point Exceptions
Overflow, Underflow, Invalid, Divide-by-Zero, 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.
#UD If an unmasked SIMD floating-point exception and CR4.OSXM-
MEXCPT[bit 10] = 0.
Opcode Instruction 64-Bit
Mode
Compat/
Leg Mode
Description
F2 0F 5E /r DIVSD xmm1,
xmm2/m64
Valid Valid Divide low double-precision floating-
point value n xmm1 by low double-
precision floating-point value in
xmm2/mem64.