Intel 64 and IA-32 Architectures Software Developers Manual Volume 2A, Instruction Set Reference, A-M

3-200 Vol. 2
INSTRUCTION SET REFERENCE, A-M
CVTPD2PS—Convert Packed Double-Precision Floating-Point Values to
Packed Single-Precision Floating-Point Values
Description
Converts two packed double-precision floating-point values in the source operand
(second operand) to two packed single-precision floating-point values in the destina-
tion operand (first operand).
The source operand can be an XMM register or a 128-bit memory location. The desti-
nation operand is an XMM register. The result is stored in the low quadword of the
destination operand, and the high quadword is cleared to all 0s. When a conversion
is inexact, the value returned is rounded according to the rounding control bits in the
MXCSR register.
In 64-bit mode, use of the REX.R prefix permits this instruction to access additional
registers (XMM8-XMM15).
Operation
DEST[31:0] ← Convert_Double_Precision_To_Single_Precision_Floating_Point(SRC[63:0]);
DEST[63:32] ← Convert_Double_Precision_To_Single_Precision_
Floating_Point(SRC[127:64]);
DEST[127:64] ← 0000000000000000H;
Intel C/C++ Compiler Intrinsic Equivalent
CVTPD2PS __m128d _mm_cvtpd_ps(__m128d a)
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.
Opcode Instruction
64-Bit
Mode
Compat/
Leg Mode Description
66 0F 5A
/r
CVTPD2PS xmm1,
xmm2/m128
Valid Valid Convert two packed double-
precision floating-point values in
xmm2/m128 to two packed
single-precision floating-point
values in xmm1.