diff options
author | Ian Jauslin <ian@jauslin.org> | 2022-05-26 20:54:30 -0400 |
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committer | Ian Jauslin <ian@jauslin.org> | 2022-05-26 21:06:09 -0400 |
commit | 77043e249cf49fd533a1ffd6f53c0b6d6fcaaba8 (patch) | |
tree | 38ea6e714d44b996ea37a9d32a49effa62d3c6ba /src/int_tools.c | |
parent | 480ce57afa138d0daac4ae750a63ac2ee9e56bd4 (diff) |
Make N be the smallest power of 2 larger than 3*K+1
Diffstat (limited to 'src/int_tools.c')
-rw-r--r-- | src/int_tools.c | 26 |
1 files changed, 26 insertions, 0 deletions
diff --git a/src/int_tools.c b/src/int_tools.c new file mode 100644 index 0000000..13e2cf9 --- /dev/null +++ b/src/int_tools.c @@ -0,0 +1,26 @@ +#include <math.h> +#include "int_tools.h" + +// return smallest power of 2 that is > x +int smallest_pow2( + int x +){ + return ipow(2,((int)log2(x)+1)); +} + +// integer power +int ipow( + int x, + int n +){ + int out=1; + while (n>0) + { + if (n%2==1){ + out*=x; + } + n/=2; + x*=x; + } + return out; +} |