We recommend using Visual Studio 2017
This documentation is archived and is not being maintained.


Microsoft Specific

Generates the x64 extended version of the Convert 64-Bit Integer to Scalar Single-Precision Floating-Point Value (cvtsi2ss) instruction.

__m128 _mm_cvtsi64x_ss( 
   __m128 a, 
   __int64 b 

[in] a

An __m128 structure containing four single-precision floating-point values.

[in] b

A 64-bit integer to be converted into a floating-point value.

An __m128 structure whose first floating-point value is the result of the conversion. The other three values are copied unchanged from a.





Header file <intrin.h>

The __m128 structure represents an XMM register, so this intrinsic allows the value b from system memory to be moved into an XMM register.

This routine is only available as an intrinsic.

// _mm_cvtsi64x_ss.cpp
// processor: x64

#include <intrin.h>
#include <stdio.h>

#pragma intrinsic(_mm_cvtsi64x_ss)

int main()
    __m128 a;
    __int64 b = 54;

    a.m128_f32[0] = 0;
    a.m128_f32[1] = 0;
    a.m128_f32[2] = 0;
    a.m128_f32[3] = 0;
    a = _mm_cvtsi64x_ss(a, b);

    printf_s( "%lf %lf %lf %lf\n",
              a.m128_f32[0], a.m128_f32[1], 
              a.m128_f32[2], a.m128_f32[3] );
54.000000 0.000000 0.000000 0.000000