_mm_stream_ss
Microsoft Specific
Writes 32-bit data to a memory location without polluting the caches.
Syntax
void _mm_stream_ss(
float * Destination,
__m128 Source
);
Parameters
Destination
[out] A pointer to the location where the source data is written.
Source
[in] 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
The intrinsic generates the movntss
instruction. To determine hardware support for this instruction, call the __cpuid
intrinsic with InfoType=0x80000001
and 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 doesn't 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[2] = " << f[2] << ", f[3] = " << f[3] << endl;
}
f[0] = -1, f[1] = -2
f[2] = -3, f[3] = 3
END Microsoft Specific
Portions Copyright 2007 by Advanced Micro Devices, Inc. All rights reserved. Reproduced with permission from Advanced Micro Devices, Inc.
See also
_mm_stream_sd
_mm_stream_ps
_mm_store_ss
_mm_sfence
Compiler intrinsics
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