+++ /dev/null
-/*
- * Acess2 ARM7 Port
- *
- * lib.c - Library Functions
- */
-#include <acess.h>
-
-// === PROTOTYPES ===
-Uint64 __divmod64(Uint64 Num, Uint64 Den, Uint64 *Rem);
-Uint64 __udivdi3(Uint64 Num, Uint64 Den);
-Uint64 __umoddi3(Uint64 Num, Uint64 Den);
-Uint32 __udivsi3(Uint32 Num, Uint32 Den);
-Uint32 __umodsi3(Uint32 Num, Uint32 Den);
-Sint32 __divsi3(Sint32 Num, Sint32 Den);
-Sint32 __modsi3(Sint32 Num, Sint32 Den);
-
-// === CODE ===
-void *memcpy(void *_dest, const void *_src, size_t _length)
-{
- Uint32 *dst;
- const Uint32 *src;
- Uint8 *dst8 = _dest;
- const Uint8 *src8 = _src;
-
- // Handle small copies / Non-aligned
- if( _length < 4 || ((tVAddr)_dest & 3) != ((tVAddr)_src & 3) )
- {
- for( ; _length--; dst8++,src8++ )
- *dst8 = *src8;
- return _dest;
- }
-
- // Force alignment
- while( (tVAddr)dst8 & 3 ) *dst8 ++ = *src8++;
- dst = (void *)dst8; src = (void *)src8;
-
- // DWORD copies
- for( ; _length > 3; _length -= 4)
- *dst++ = *src++;
-
- // Trailing bytes
- dst8 = (void*)dst; src8 = (void*)src;
- for( ; _length; _length -- )
- *dst8 ++ = *src8 ++;
-
- return _dest;
-}
-
-int memcmp(const void *_m1, const void *_m2, size_t _length)
-{
- const Uint32 *m1, *m2;
- const Uint8 *m1_8 = _m1, *m2_8 = _m2;
-
- // Handle small copies / Non-aligned
- if( _length < 4 || ((tVAddr)_m1 & 3) != ((tVAddr)_m1 & 3) )
- {
- for( ; _length--; m1_8++,m2_8++ ) {
- if(*m1_8 != *m2_8) return *m1_8 - *m2_8;
- }
- return 0;
- }
-
- // Force alignment
- for( ; (tVAddr)m1_8 & 3; m1_8 ++, m2_8 ++) {
- if(*m1_8 != *m2_8) return *m1_8 - *m2_8;
- }
- m1 = (void *)m1_8; m2 = (void *)m2_8;
-
- // DWORD copies
- for( ; _length > 3; _length -= 4, m1++, m2++)
- if(*m1 != *m2) return *m1 - *m2;
-
- // Trailing bytes
- m1_8 = (void*)m1; m2_8 = (void*)m2;
- for( ; _length; _length --, m1_8++, m2_8++ )
- if(*m1_8 != *m2_8) return *m1_8 - *m2_8;
-
- return 0;
-}
-
-void *memset(void *_dest, int _value, size_t _length)
-{
- Uint32 *dst, val32;
- Uint8 *dst8 = _dest;
-
- _value = (Uint8)_value;
-
- // Handle small copies / Non-aligned
- if( _length < 4 )
- {
- for( ; _length--; dst8++ )
- *dst8 = _value;
- return _dest;
- }
-
- val32 = _value;
- val32 |= val32 << 8;
- val32 |= val32 << 16;
-
- // Force alignment
- while( (tVAddr)dst8 & 3 ) *dst8 ++ = _value;
- dst = (void *)dst8;
-
- // DWORD copies
- for( ; _length > 3; _length -= 4)
- *dst++ = val32;
-
- // Trailing bytes
- dst8 = (void*)dst;
- for( ; _length; _length -- )
- *dst8 ++ = _value;
-
- return _dest;
-}
-
-Uint64 __divmod64(Uint64 Num, Uint64 Den, Uint64 *Rem)
-{
- Uint64 ret, add;
-
- ret = 0;
- add = 1;
-
- // Find what power of two times Den is > Num
- while( Num >= Den )
- {
- Den <<= 1;
- add <<= 1;
- }
-
- // Search backwards
- while( add > 1 )
- {
- add >>= 1;
- Den >>= 1;
- // If the numerator is > Den, subtract and add to return value
- if( Num > Den )
- {
- ret += add;
- Num -= Den;
- }
- }
- if(Rem) *Rem = Num;
- return ret;
-}
-
-Uint64 DivMod64U(Uint64 Num, Uint64 Den, Uint64 *Rem)
-{
- Uint64 ret;
- if(Den == 0) return 0; // TODO: #div0
- if(Num == 0) {
- if(Rem) *Rem = 0;
- return 0;
- }
- if(Den == 1) {
- if(Rem) *Rem = 0;
- return Num;
- }
- if(Den == 2) {
- if(Rem) *Rem = Num & 1;
- return Num >> 1;
- }
- if(Den == 16) {
- if(Rem) *Rem = Num & 0xF;
- return Num >> 4;
- }
- if(Den == 32) {
- if(Rem) *Rem = Num & 0x1F;
- return Num >> 5;
- }
- if(Den == 0x1000) {
- if(Rem) *Rem = Num & 0xFFF;
- return Num >> 12;
- }
-
- #if 0
- {
- // http://www.tofla.iconbar.com/tofla/arm/arm02/index.htm
- Uint64 tmp = 1;
- __asm__ __volatile__(
- "1:"
- "cmpl %2,%1"
- "movls %2,%2,lsl#1"
- "movls %3,%3,lsl#1"
- "bls 1b"
- "2:"
- "cmpl %"
- while(Num > Den) {
- Den <<= 1;
- tmp <<= 1;
- }
- Den >>= 1; tmp >>= 1;
- while(
- }
- if(Rem) *Rem = Num;
- return ret;
- #elif 0
- for( ret = 0; Num > Den; ret ++, Num -= Den) ;
- if(Rem) *Rem = Num;
- return ret;
- #else
- ret = __divmod64(Num, Den, Rem);
- return ret;
- #endif
-}
-
-// Unsigned Divide 64-bit Integer
-Uint64 __udivdi3(Uint64 Num, Uint64 Den)
-{
- return DivMod64U(Num, Den, NULL);
- #if 0
-// if( Den == 0 ) return 5 / (Uint32)Den; // Force a #DIV0
- if( Den == 16 ) return Num >> 4;
- if( Den == 256 ) return Num >> 8;
- if( Den == 512 ) return Num >> 9;
- if( Den == 1024 ) return Num >> 10;
- if( Den == 2048 ) return Num >> 11;
- if( Den == 4096 ) return Num >> 12;
- if( Num < Den ) return 0;
- if( Num <= 0xFFFFFFFF && Den <= 0xFFFFFFFF )
- return (Uint32)Num / (Uint32)Den;
-
- #if 0
- if( Den <= 0xFFFFFFFF ) {
- (Uint32)(Num >> 32) / (Uint32)Den
- }
- #endif
- Uint64 ret = 0;
- for( ret = 0; Num > Den; ret ++, Num -= Den );
- return ret;
- #endif
-}
-
-// Unsigned Modulus 64-bit Integer
-Uint64 __umoddi3(Uint64 Num, Uint64 Den)
-{
- Uint64 ret = 0;
- DivMod64U(Num, Den, &ret);
- return ret;
- #if 0
- if( Den == 0 ) return 5 / (Uint32)Den; // Force a #DIV0
- if( Num < Den ) return Num;
- if( Den == 1 ) return 0;
- if( Den == 2 ) return Num & 1;
- if( Den == 16 ) return Num & 3;
- if( Den == 256 ) return Num & 0xFF;
- if( Den == 512 ) return Num & 0x1FF;
- if( Den == 1024 ) return Num & 0x3FF;
- if( Den == 2048 ) return Num & 0x7FF;
- if( Den == 4096 ) return Num & 0xFFF;
-// if( Num <= 0xFFFFFFFF && Den <= 0xFFFFFFFF )
-// return (Uint32)Num % (Uint32)Den;
-
- #if 0
- if( Den <= 0xFFFFFFFF ) {
- (Uint32)(Num >> 32) / (Uint32)Den
- }
- #endif
- for( ; Num > Den; Num -= Den );
- return Num;
- #endif
-}
-
-#define _divide_s_32(Num, Den, rem) __asm__ __volatile__ ( \
- "mov %0, #0\n" \
- " adds %1, %1, %1\n" \
- " .rept 32\n" \
- " adcs %0, %2, %0, lsl #1\n" \
- " subcc %0, %0, %3\n" \
- " adcs %1, %1, %1\n" \
- " .endr\n" \
- : "=r" (rem), "=r" (Num) \
- : "r" (Den) \
- : "cc" \
- )
-Uint32 __udivsi3(Uint32 Num, Uint32 Den)
-{
- register Uint32 ret;
- Uint64 P, D;
- int i;
-
- if( Num == 0 ) return 0;
- if( Den == 0 ) return 0xFFFFFFFF; // TODO: Throw an error
- if( Den == 1 ) return Num;
-
- D = ((Uint64)Den) << 32;
-
- for( i = 32; i --; )
- {
- P = 2*P - D;
- if( P >= 0 )
- ret |= 1;
- else
- P += D;
- ret <<= 1;
- }
-
-// _divide_s_32(Num, Den, rem);
- return Num;
-}
-
-Uint32 __umodsi3(Uint32 Num, Uint32 Den)
-{
- return Num - __udivsi3(Num, Den)*Den;
-}
-
-Sint32 __divsi3(Sint32 Num, Sint32 Den)
-{
- if( (Num < 0) && (Den < 0) )
- return __udivsi3(-Num, -Den);
- else if( Num < 0 )
- return __udivsi3(-Num, Den);
- else if( Den < 0 )
- return __udivsi3(Den, -Den);
- else
- return __udivsi3(Den, Den);
-}
-
-Sint32 __modsi3(Sint32 Num, Sint32 Den)
-{
- //register Sint32 rem;
- //_divide_s_32(Num, Den, rem);
- return Num - __divsi3(Num, Den) * Den;
-}
git.ucc.asn.au / tpg / acess2.git / blobdiff
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