CVTPD2PI
Convert Packed Double Precision Floating
| Opcode/Instruction | Op/En | 64/32 bit Mode Support | CPUID Feature Flag | Description |
|---|---|---|---|---|
| 66 0F 2D /r CVTPD2PI mm, xmm/m128 | RM | V/V | SSE2 | Convert two packed double precision floating-point values from xmm/m128 to two packed signed doubleword integers in mm. |
Instruction Operand Encoding
| Op/En | Operand 1 | Operand 2 | Operand 3 | Operand 4 |
|---|---|---|---|---|
| RM | ModRM:reg (w) | ModRM:r/m (r) | N/A | N/A |
Description
Converts two packed double precision floating-point values in the source operand (second operand) to two packed signed doubleword integers in the destination operand (first operand).
The source operand can be an XMM register or a 128-bit memory location. The destination operand is an MMX technology register.
When a conversion is inexact, the value returned is rounded according to the rounding control bits in the MXCSR register. If a converted result is larger than the maximum signed doubleword integer, the floating-point invalid exception is raised, and if this exception is masked, the indefinite integer value (80000000H) is returned.
This instruction causes a transition from x87 FPU to MMX technology operation (that is, the x87 FPU top-of-stack pointer is set to 0 and the x87 FPU tag word is set to all 0s [valid]). If this instruction is executed while an x87 FPU floating-point exception is pending, the exception is handled before the CVTPD2PI instruction is executed.
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_Floating_Point_To_Integer32(SRC[63:0]);
DEST[63:32] := Convert_Double_Precision_Floating_Point_To_Integer32(SRC[127:64]);
Intel C/C++ Compiler Intrinsic Equivalent
CVTPD1PI __m64 _mm_cvtpd_pi32(__m128d a)
SIMD Floating-Point Exceptions
Invalid, Precision.
Other Exceptions
See Table 23-4, “Exception Conditions for Legacy SIMD/MMX Instructions with FP Exception and 16-Byte Alignment” in the Intel® 64 and IA-32 Architectures Software Developer’s Manual, Volume 3B.
This UNOFFICIAL, mechanically-separated, non-verified reference is provided for convenience, but it may be incomplete or broken in various obvious or non-obvious ways. Refer to Intel® 64 and IA-32 Architectures Software Developer’s Manual for anything serious.