77 lines
1.0 KiB
C
77 lines
1.0 KiB
C
/* Few u64 utils implemented in C
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* Author: Gautam BT
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*/
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#include <minix/u64.h>
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u64_t rrotate64(u64_t x, unsigned short b)
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{
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u64_t r, t;
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b %= 64;
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if(b == 32) {
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r.lo = x.hi;
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r.hi = x.lo;
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return r;
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}else if(b < 32) {
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r.lo = (x.lo >> b) | (x.hi << (32 - b));
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r.hi = (x.hi >> b) | (x.lo << (32 - b));
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return r;
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}else {
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/* Rotate by 32 bits first then rotate by remaining */
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t.lo = x.hi;
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t.hi = x.lo;
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b = b - 32;
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r.lo = (t.lo >> b) | (t.hi << (32 - b));
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r.hi = (t.hi >> b) | (t.lo << (32 - b));
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return r;
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}
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}
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u64_t rshift64(u64_t x, unsigned short b)
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{
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u64_t r;
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if(b >= 64)
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return make64(0,0);
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if(b >= 32) {
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r.hi = 0;
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r.lo = x.hi >> (b - 32);
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}else {
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r.lo = (x.lo >> b) | (x.hi << (32 - b));
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r.hi = (x.hi >> b);
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}
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return r;
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}
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u64_t xor64(u64_t a, u64_t b)
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{
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u64_t r;
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r.hi = a.hi ^ b.hi;
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r.lo = a.lo ^ b.lo;
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return r;
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}
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u64_t and64(u64_t a, u64_t b)
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{
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u64_t r;
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r.hi = a.hi & b.hi;
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r.lo = a.lo & b.lo;
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return r;
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}
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u64_t not64(u64_t a)
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{
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u64_t r;
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r.hi = ~a.hi;
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r.lo = ~a.lo;
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return r;
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}
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