-
Notifications
You must be signed in to change notification settings - Fork 98
CVTPI2PD
CVTPI2PD — Convert Packed Dword Integers to Packed Double-Precision FP Values
| Opcode/ Instruction | Op/ En | 64-Bit Mode | Compat/ Leg Mode | Description |
| 66 0F 2A /r CVTPI2PD xmm, mm/m64* | RM Valid | Valid | Convert two packed signed doubleword integers from mm/mem64 to two packed double-precision floating-point values in xmm. |
*Operation is different for different operand sets; see the Description section.
| Op/En | Operand 1 | Operand 2 | Operand 3 | Operand 4 |
| RM | ModRM:reg (w) | ModRM:r/m (r) | NA | NA |
Converts two packed signed doubleword integers in the source operand (second operand) to two packed double- precision floating-point values in the destination operand (first operand).
The source operand can be an MMX technology register or a 64-bit memory location. The destination operand is an XMM register. In addition, depending on the operand configuration:
-
For operands xmm, mm: the 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 CVTPI2PD instruction is executed.
-
For operands xmm, m64: the instruction does not cause a transition to MMX technology and does not take x87 FPU exceptions.
In 64-bit mode, use of the REX.R prefix permits this instruction to access additional registers (XMM8-XMM15).
DEST[63:0] ← Convert_Integer_To_Double_Precision_Floating_Point(SRC[31:0]);
DEST[127:64] ← Convert_Integer_To_Double_Precision_Floating_Point(SRC[63:32]);CVTPI2PD:
__m128d _mm_cvtpi32_pd(__m64 a)None
See Table 22-6, “Exception Conditions for Legacy SIMD/MMX Instructions with XMM and without FP Exception,” in the Intel® 64 and IA-32 Architectures Software Developer’s Manual, Volume 3B.
Source: Intel® Architecture Software Developer's Manual (May 2018)
Generated: 5-6-2018