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