image/svg+xml CVTPI2PS—Convert Packed Dword Integers to Packed Single-Precision FP Values Instruction Operand Encoding 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 Table22-5, “Exception Conditions for Legacy SIMD/MMX Instructions with XMM and FP Exception” in the Intel® 64 and IA-32 Architectures Software Developer’s Manual, Volume 3B . Opcode/ Instruction Op/ En 64-Bit Mode Compat/ Leg Mode Description NP 0F 2A / r CVTPI2PS xmm , mm / m64 RMValidValidConvert two signed doubleword integers from mm / m64 to two single-precision floating-point values in xmm . Op/EnOperand 1Operand 2Operand 3Operand 4 RMModRM:reg (r, w)ModRM:r/m (r)NANA This UNOFFICIAL reference was generated from the official Intel® 64 and IA-32 Architectures Software Developer’s Manual by a dumb script. There is no guarantee that some parts aren't mangled or broken and is distributed WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE .