_mm_floor_pd
Microsoft Specific
Emits the Streaming SIMD Extensions 4 (SSE4) instruction roundpd. This instruction rounds the parameter down.
__m128d _mm_floor_pd(
__m128d a
);
Parameters
- [in] a
A 128-bit parameter that contains two 64-bit floating point values.
Return value
The result can be expressed with the following equations:
r0 := FLOOR(a0)
r1 := FLOOR(a1)
Requirements
Intrinsic |
Architecture |
|---|---|
_mm_floor_pd |
x86, x64 |
Header file <smmintrin.h>
Remarks
r0 and a0 are the lower 64 bits of return value r and parameter a. r1 and a1 are the higher 64 bits of return value r and parameter a.
This function is implemented as a macro that invokes _mm_round_pd.
Before you use this intrinsic, software must ensure that the processor supports the instruction.
Example
#include <stdio.h>
#include <smmintrin.h>
int main ()
{
__m128d a;
a.m128d_f64[0] = 3.9;
a.m128d_f64[1] = -0.125;
__m128d res = _mm_floor_pd(a);
printf_s("Original a: %I64f\t%I64f\n",
a.m128d_f64[0], a.m128d_f64[1]);
printf_s("Result res: %I64f\t%I64f\n",
res.m128d_f64[0], res.m128d_f64[1]);
return 0;
}
Original a: 3.900000 -0.125000
Result res: 3.000000 -1.000000