CVTPI2PS

CVTPI2PS — Convert Packed Dword Integers to Packed Single Precision Floating-Point Values

Opcode/ Instruction	Op/ En	64-Bit Mode	Compat/ Leg Mode	Description
NP 0F 2A /r CVTPI2PS xmm, mm/m64	RM	Valid	Valid	Convert two signed doubleword integers from mm/m64 to two single precision floating-point values in xmm.

Instruction Operand Encoding

Op/En	Operand 1	Operand 2	Operand 3	Operand 4
RM	ModRM:reg (r, w)	ModRM:r/m (r)	N/A	N/A

Description

Converts two packed signed doubleword integers in the source operand (second operand) to two packed single 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. The results are stored in the low quadword of the destination operand, and the high quadword remains unchanged. When a conversion is inexact, the value returned is rounded according to the rounding control bits in the MXCSR register.

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 CVTPI2PS 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_Integer_To_Single_Precision_Floating_Point(SRC[31:0]);
DEST[63:32] ← Convert_Integer_To_Single_Precision_Floating_Point(SRC[63:32]);
(* High quadword of destination unchanged *)

Intel C/C++ Compiler Intrinsic Equivalent

CVTPI2PS __m128 _mm_cvtpi32_ps(__m128 a, __m64 b)

SIMD Floating-Point Exceptions

Precision.

Other Exceptions

® See Section 25.25.3, “Exception Conditions of Legacy SIMD Instructions Operating on MMX Registers” in the Intel 64 and IA-32 Architectures Software Developer’s Manual, Volume 3B.

---

Source: Intel® 64 and IA-32 Architectures Software Developer's Manual, Combined Volumes (Order Number 325462-091US, March 2026)
Generated: 7-6-2026