Microsoft Specific
Emits the Streaming SIMD Extensions 4 (SSE4) instruction roundsd. This instruction rounds up a double precision floating point value.
__m128d _mm_ceil_sd(
__m128d a,
__m128d b
);
Parameters
[in] a
A 128-bit parameter that contains two 64-bit floating point values.[in] b
A 128-bit parameter that contains a 64-bit floating point value in the low quadword.
Return value
r0 := CEIL(b0)
r1 := a1
Requirements
Intrinsic |
Architecture |
|---|---|
_mm_ceil_sd |
x86, x64 |
Header file <smmintrin.h>
Remarks
r0, a0, and b0 are the low order 64 bits of return value r and parameters a and b.
r1, a1, and b0 are the high order 64 bits of return value r and parameters a and b.
This function is implemented as a macro that invokes intrinsic _mm_round_sd with appropriate rounding control.
Before using this intrinsic, software must ensure that the processor supports the instruction.
Example
#include <stdio.h>
#include <smmintrin.h>
int main () {
__m128d a;
__m128d b;
a.m128d_f64[1] = 10.4;
a.m128d_f64[0] = -6.5;
b.m128d_f64[1] = 0;
b.m128d_f64[0] = 625.57;
__m128d res = _mm_ceil_sd( a, b );
printf_s("Original a: %10f %10f\nOriginal b: %10f %10f\n",
a.m128d_f64[1], a.m128d_f64[0],
b.m128d_f64[1], b.m128d_f64[0]);
printf_s("Result res: %10f %10f\n",
res.m128d_f64[1], res.m128d_f64[0]);
return 0;
}
Original a: 10.400000 -6.500000 Original b: 0.000000 625.570000 Result res: 10.400000 626.000000