_mm_stream_ss
Microsoft Specific
Writes 32-bit data to a memory location without polluting the caches.
void _mm_stream_ss(
float * Dest,
__m128 Source
);
Parameters
[out] Dest
A pointer to the location where the source data is written.[in] Source
A 128-bit number that contains the float value to be written in its bottom 32 bits..
Return Value
None.
Requirements
Intrinsic |
Architecture |
|---|---|
_mm_stream_ss |
SSE4a |
Header file <intrin.h>
Remarks
This intrinsic generates the movntss instruction. To determine hardware support for this instruction, call the __cpuid intrinsic with InfoType=0x80000001and check bit 6 of CPUInfo[2] (ECX). This bit is 1 when the instruction is supported, and 0 otherwise.
If you run code that uses the _mm_stream_ss intrinsic on hardware that does not support the movntss instruction, the results are unpredictable.
Example
// Compile this sample with: /EHsc
#include <iostream>
#include <intrin.h>
using namespace std;
int main()
{
__m128 vals;
float f[4];
f[0] = -1.;
f[1] = -2.;
f[2] = -3.;
f[3] = -4.;
vals.m128_f32[0] = 0.;
vals.m128_f32[1] = 1.;
vals.m128_f32[2] = 2.;
vals.m128_f32[3] = 3.;
_mm_stream_ss(&f[3], vals);
cout << "f[0] = " << f[0] << ", f[1] = " << f[1] << endl;
cout << "f[1] = " << f[1] << ", f[3] = " << f[3] << endl;
}
f[0] = -1, f[1] = -2 f[2] = -3, f[3] = 3
END Microsoft Specific
Copyright 2007 by Advanced Micro Devices, Inc. All rights reserved. Reproduced with permission from Advanced Micro Devices, Inc.