Computer Hardware User's Manual

Vol. 2A 3-213
INSTRUCTION SET REFERENCE, A-M
CVTPS2PD—Convert Packed Single-Precision Floating-Point Values to Packed Double-
Precision Floating-Point Values
CVTPS2PD—Convert Packed Single-Precision Floating-Point Values to
Packed Double-Precision Floating-Point Values
Description
Converts two packed single-precision floating-point values in the source operand
(second operand) to two packed double-precision floating-point values in the desti-
nation operand (first operand).
The source operand can be an XMM register or a 64-bit memory location. The desti-
nation operand is an XMM register. When the source operand is an XMM register, the
packed single-precision floating-point values are contained in the low quadword of
the register.
In 64-bit mode, use of the REX.R prefix permits this instruction to access additional
registers (XMM8-XMM15).
Operation
DEST[63:0] ← Convert_Single_Precision_To_Double_Precision_Floating_Point(SRC[31:0]);
DEST[127:64] ← Convert_Single_Precision_To_Double_Precision_Floating_Point(SRC[63:32]);
Intel C/C++ Compiler Intrinsic Equivalent
CVTPS2PD __m128d _mm_cvtps_pd(__m128 a)
SIMD Floating-Point Exceptions
Invalid, 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
0F 5A /r CVTPS2PD xmm1,
xmm2/m64
Valid Valid Convert two packed single-precision
floating-point values in xmm2/m64
to two packed double-precision
floating-point values in xmm1.