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Important This document may not represent best practices for current development, links to downloads and other resources may no longer be valid. Current recommended version can be found here.

_set_SSE2_enable

Enables or disables the use of Streaming SIMD Extensions 2 Instructions (SSE2) instructions in CRT math routines.

int _set_SSE2_enable(
   int flag
);

flag

1 for enabling the SSE2 implementation. 0 for disabling the SSE2 implementation. By default, SSE2 implementation is enabled on processors that support it.

Nonzero if SSE2 implementation is enabled; zero if SSE2 implementation is disabled.

The following functions have SSE2 implementations that can be enabled with _set_SSE2_enable:

The SSE2 implementation might give slightly different answers from the default implementations of these functions, because SSE2 intermediate values are 64-bit floating-point quantities but the default implementation intermediate values are 80-bit floating-point quantities.

The SSE2 implementation is only used if all exceptions are masked. Use _control87, _controlfp to mask exceptions.

Routine

Required header

_set_SSE2_enable

<math.h>

For more compatibility information, see Compatibility in the Introduction.

// crt_set_SSE2_enable.c
// processor: x86
#include <math.h>
#include <stdio.h>

int main()
{
   int i = _set_SSE2_enable(1);

   if (i)
      printf("SSE2 enabled.\n");
   else
      printf("SSE2 not enabled; processor does not support SSE2.\n");
}
SSE2 enabled.

Not applicable. To call the standard C function, use PInvoke. For more information, see Platform Invoke Examples.

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