_mm_cvttss_si64x

Article
06/05/2017

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The latest version of this topic can be found at _mm_cvttss_si64x.

Microsoft Specific**

Emits the x64 extended version of the Convert with Truncation Single-Precision Floating-Point Number to 64-Bit Integer (cvttss2si) instruction.

Syntax

__int64 _mm_cvttss_si64x(   
   __m128 value   
);

Parameters

[in] value
An __m128 structure containing single-precision floating-point values.

Return Value

The result of the conversion of the first floating-point value to a 64-bit integer.

Requirements

Intrinsic	Architecture
`_mm_cvttss_si64x`	x64

Header file <intrin.h>

Remarks

The intrinsic differs from _mm_cvtss_si64x only in that inexact conversions are truncated toward zero. Because the __m128 structure represents an XMM register, the instruction generated moves data from an XMM register into system memory.

This routine is only available as an intrinsic.

Example

// _mm_cvttss_si64x.cpp  
// processor: x64  
#include <intrin.h>  
#include <stdio.h>  
  
#pragma intrinsic(_mm_cvttss_si64x)  
  
int main()  
{  
    __m128 a;  
    __int64 b = 54;  
  
    // _mm_load_ps requires an aligned buffer.  
    __declspec(align(16)) float af[4] = { 101.5, 200.75,  
                                          300.5, 400.5 };  
  
    // Load a with the floating point values.  
    // The values will be copied to the XMM registers.  
    a = _mm_load_ps(af);  
  
    // Extract the first element of a and convert to an integer  
    b = _mm_cvttss_si64x(a);  
  
    printf_s("%I64d\n", b);  
}

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