I've noticed that this C code:
#include "math.h"
int main() {
double x = 2.5;
int Nmax = 10000000;
for (int N=0; N<Nmax; N++) {
for (int i=0; i<20; i++) {
pow(x, i);
}
}
}
can run up to 50x faster than this Go code:
package main
import "math"
func main() {
x := 2.5
Nmax := 10000000
for N := 0; N < Nmax; N++ {
for i := 0; i < 20; i++ {
math.Pow(x, float64(i))
}
}
}
The C code was compiled with: gcc -O2 ccode.c -o ccode -lm
then run with time ./ccode
The Go code was compiled with: go build gcode.go
then run with time ./gcode
I've used the time command on Linux (Ubuntu) to get some estimate.
So the question is: how can we make the Go code faster?
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