_mm_floor_ps
Microsoft Specific
Emits the Streaming SIMD Extensions 4 (SSE4) instruction roundps. This instruction rounds the parameter down.
__m128 _mm_floor_ps(
__m128 a
);
Parameters
- [in] a
A 128-bit parameter that contains four 32-bit floating point values.
Return value
The result can be expressed with the following equations:
r0 := FLOOR(a0)
r1 := FLOOR(a1)
r2 := FLOOR(a2)
r3 := FLOOR(a3)
Requirements
Intrinsic |
Architecture |
|---|---|
_mm_floor_ps |
x86, x64 |
Header file <smmintrin.h>
Remarks
r0-r3 and a0-a3 are the sequentially ordered 32-bit components of return value r and parameter a. r0 and a0 denote the least significant 32 bits.
This function is implemented as a macro that invokes _mm_round_ps.
Before you use this intrinsic, software must ensure that the processor supports the instruction.
Example
#include <stdio.h>
#include <smmintrin.h>
int main ()
{
__m128 a;
a.m128_f32[0] = 0.0625;
a.m128_f32[1] = -3.25;
a.m128_f32[2] = 100.125;
a.m128_f32[3] = -0.5;
__m128 res = _mm_floor_ps(a);
printf_s("Original a: %f\t%f\t%f\t%f\n",
a.m128_f32[0], a.m128_f32[1], a.m128_f32[2], a.m128_f32[3]);
printf_s("Result res: %f\t%f\t%f\t%f\n",
res.m128_f32[0], res.m128_f32[1], res.m128_f32[2], res.m128_f32[3]);
return 0;
}
Original a: 0.062500 -3.250000 100.125000 -0.500000
Result res: 0.000000 -4.000000 100.000000 -1.000000