minix/lib/libminlib/u64util.c

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/* Few u64 utils implemented in C
* Author: Gautam BT
*/
#include <minix/u64.h>
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#if !defined(__LONG_LONG_SUPPORTED)
u64_t rrotate64(u64_t x, unsigned short b)
{
u64_t r, t;
b %= 64;
if(b == 32) {
r.lo = x.hi;
r.hi = x.lo;
return r;
}else if(b < 32) {
r.lo = (x.lo >> b) | (x.hi << (32 - b));
r.hi = (x.hi >> b) | (x.lo << (32 - b));
return r;
}else {
/* Rotate by 32 bits first then rotate by remaining */
t.lo = x.hi;
t.hi = x.lo;
b = b - 32;
r.lo = (t.lo >> b) | (t.hi << (32 - b));
r.hi = (t.hi >> b) | (t.lo << (32 - b));
return r;
}
}
u64_t rshift64(u64_t x, unsigned short b)
{
u64_t r;
if(b >= 64)
return make64(0,0);
if(b >= 32) {
r.hi = 0;
r.lo = x.hi >> (b - 32);
}else {
r.lo = (x.lo >> b) | (x.hi << (32 - b));
r.hi = (x.hi >> b);
}
return r;
}
u64_t xor64(u64_t a, u64_t b)
{
u64_t r;
r.hi = a.hi ^ b.hi;
r.lo = a.lo ^ b.lo;
return r;
}
u64_t and64(u64_t a, u64_t b)
{
u64_t r;
r.hi = a.hi & b.hi;
r.lo = a.lo & b.lo;
return r;
}
u64_t not64(u64_t a)
{
u64_t r;
r.hi = ~a.hi;
r.lo = ~a.lo;
return r;
}
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#else
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#if !defined(__LONG_LONG_SUPPORTED)
#error "ERROR: These functions require long long support"
#endif
u64_t rrotate64(u64_t x, unsigned short b)
{
b %= 64;
if ((b &= 63) == 0)
return x;
return (x >> b) | (x << (64 - b));
}
u64_t rshift64(u64_t x, unsigned short b)
{
if (b >= 64)
return 0;
return x >> b;
}
u64_t xor64(u64_t a, u64_t b)
{
return a ^ b;
}
u64_t and64(u64_t a, u64_t b)
{
return a & b;
}
u64_t not64(u64_t a)
{
return ~a;
}
#endif