197 lines
2.4 KiB
C
Executable File
197 lines
2.4 KiB
C
Executable File
#include "math64.h"
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#ifndef COMPILER_SUPPORTS_LONG_LONG
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UInt64 u64_from_halves(UInt32 hi, UInt32 lo){
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UInt64 r;
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r.lo = lo;
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r.hi = hi;
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return r;
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}
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UInt64 u64_32_to_64(UInt32 v){
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UInt64 r;
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r.hi = 0;
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r.lo = v;
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return r;
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}
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UInt32 u64_64_to_32(UInt64 v){
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return v.lo;
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}
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UInt32 u64_get_hi(UInt64 v){
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return v.hi;
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}
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UInt64 u64_add(UInt64 a, UInt64 b){
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UInt64 r;
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r.lo = a.lo + b.lo;
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r.hi = a.hi + b.hi;
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if(r.lo < a.lo) r.hi++;
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return r;
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}
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UInt64 u64_add32(UInt64 a, UInt32 b){
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UInt64 r;
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r.lo = a.lo + b;
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r.hi = a.hi;
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if(r.lo < a.lo) r.hi++;
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return r;
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}
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UInt64 u64_umul3232(UInt32 a, UInt32 b){
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UInt64 r;
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UInt32 ah, al, bh, bl;
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ah = a >> 16;
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al = a & 0xFFFFUL;
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bh = b >> 16;
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bl = b & 0xFFFFUL;
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r = u64_shl(u64_32_to_64(ah * bh), 16);
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r = u64_add32(r, ah * bl);
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r = u64_add32(r, al * bh);
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r = u64_add32(u64_shl(r, 16), al * bl);
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return r;
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}
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UInt64 u64_smul3232(Int32 a, Int32 b){
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Boolean negative = false;
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UInt64 r;
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if(a < 0){
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a = -a;
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negative = !negative;
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}
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if(b < 0){
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b = -b;
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negative = !negative;
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}
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r = u64_umul3232(a, b);
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if(negative){
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r.hi = ~r.hi; //negate r
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r.lo = ~r.lo;
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r = u64_inc(r);
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}
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return r;
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}
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UInt64 u64_shr(UInt64 v, unsigned bits){
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UInt64 a = v;
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while(bits >= 32){
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a.lo = a.hi;
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a.hi = 0;
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bits -= 32;
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}
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a.lo = (a.lo >> bits) + (a.hi << (32 - bits));
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a.hi >>= bits;
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return a;
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}
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UInt64 u64_shl(UInt64 v, unsigned bits){
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UInt64 a = v;
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while(bits >= 32){
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a.hi = a.lo;
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a.lo = 0;
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bits -= 32;
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}
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a.hi = (a.hi << bits) + (a.lo >> (32 - bits));
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a.lo <<= bits;
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return a;
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}
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UInt64 u64_xtnd32(UInt64 v){
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UInt64 a = v;
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if(a.lo & 0x80000000UL) a.hi = 0xFFFFFFFFUL;
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return a;
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}
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Boolean u64_isZero(UInt64 a){
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return a.lo == 0 && a.hi == 0;
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}
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UInt64 u64_inc(UInt64 v){
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UInt64 a = v;
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if(!++a.lo) a.hi++;
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return a;
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}
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UInt64 u64_and(UInt64 a, UInt64 b){
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UInt64 r;
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r.lo = a.lo & b.lo;
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r.hi = a.hi & b.hi;
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return r;
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}
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UInt64 u64_zero(void){
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UInt64 r;
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r.lo = 0;
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r.hi = 0;
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return r;
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}
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UInt64 u64_sub(UInt64 a, UInt64 b){
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UInt64 bn;
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bn.lo = ~b.lo;
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bn.hi = ~b.hi;
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bn = u64_inc(bn);
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return u64_add(a, bn);
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}
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#endif |