_mm_castps_si128
Microsoft Specific
Applies a type cast to reinterpret four 32-bit floating point values passed in as a 128-bit parameter as packed 32-bit integers.
__m128i _mm_castps_si128(
__m128 a
);
Parameters
- [in] a
A 128-bit parameter that contains four 32-bit floating point values.
Return value
r := a
Requirements
Intrinsic |
Architecture |
|---|---|
_mm_castps_si128 |
x86, x64 |
Header file <emmintrin.h>
Remarks
The 128-bit return value r is a copy of the 128-bit parameter a, but cast as four 32-bit integers. This intrinsic changes one data type to another without performing any conversion.
This intrinsic does not map to any specific machine instruction.
Example
// _mm_castps_si128.cpp
#include <stdio.h>
#include <emmintrin.h>
int main () {
__m128 a;
a.m128_f32[3] = 0.5;
a.m128_f32[2] = 89129;
a.m128_f32[1] = 2.000000;
a.m128_f32[0] = 0.000000;
__m128i res = _mm_castps_si128( a );
printf_s("Original a: %12f %12f %12f %12f\n",
a.m128_f32[3], a.m128_f32[2],
a.m128_f32[1], a.m128_f32[0]);
printf_s("Result res: %12i %12i %12i %12i\n",
res.m128i_i32[3], res.m128i_i32[2],
res.m128i_i32[1], res.m128i_i32[0]);
__m128 newA = _mm_castsi128_ps( res );
printf_s("New a: %12f %12f %12f %12f\n",
newA.m128_f32[3], newA.m128_f32[2],
newA.m128_f32[1], newA.m128_f32[0]);
return 0;
}
Original a: 0.500000 89129.000000 2.000000 0.000000 Result res: 1056964608 1202590848 1073741824 0 New a: 0.500000 89129.000000 2.000000 0.000000