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Some extra int64 functions.

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[originally from svn r6778]
This commit is contained in:
Owen Dunn 2006-08-05 13:48:53 +00:00
parent 9ca35dd9e5
commit 3d522cfd08
2 changed files with 56 additions and 0 deletions
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51
int64.c
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@ -77,3 +77,54 @@ int uint64_compare(uint64 x, uint64 y)
return x.lo < y.lo ? -1 : +1;
return 0;
}
uint64 uint64_subtract(uint64 x, uint64 y)
{
x.lo -= y.lo;
x.hi -= y.hi + (x.lo > ~y.lo ? 1 : 0);
return x;
}
double uint64_to_double(uint64 x)
{
return (4294967296.0 * x.hi) + (double)x.lo;
}
uint64 uint64_shift_right(uint64 x, int shift)
{
if (shift < 32) {
x.lo >>= shift;
x.lo |= (x.hi << (32-shift));
x.hi >>= shift;
} else {
x.lo = x.hi >> (shift-32);
x.hi = 0;
}
return x;
}
uint64 uint64_shift_left(uint64 x, int shift)
{
if (shift < 32) {
x.hi <<= shift;
x.hi |= (x.lo >> (32-shift));
x.lo <<= shift;
} else {
x.hi = x.lo << (shift-32);
x.lo = 0;
}
return x;
}
uint64 uint64_from_decimal(char *str)
{
uint64 ret;
ret.hi = ret.lo = 0;
while (*str >= '0' && *str <= '9') {
ret = uint64_add(uint64_shift_left(ret, 3),
uint64_shift_left(ret, 1));
ret = uint64_add32(ret, *str - '0');
str++;
}
return ret;
}

5
int64.h
View File

@ -15,5 +15,10 @@ uint64 uint64_make(unsigned long hi, unsigned long lo);
uint64 uint64_add(uint64 x, uint64 y);
uint64 uint64_add32(uint64 x, unsigned long y);
int uint64_compare(uint64 x, uint64 y);
uint64 uint64_subtract(uint64 x, uint64 y);
double uint64_to_double(uint64 x);
uint64 uint64_shift_right(uint64 x, int shift);
uint64 uint64_shift_left(uint64 x, int shift);
uint64 uint64_from_decimal(char *str);
#endif