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PGXP: Small optimization in memory lookup

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This commit is contained in:
Connor McLaughlin 2021-05-25 20:01:00 +10:00
parent eaab0cc033
commit df26792c19
1 changed files with 23 additions and 62 deletions
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69
src/core/pgxp.cpp
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@ -19,6 +19,8 @@
***************************************************************************/
#include "pgxp.h"
#include "bus.h"
#include "cpu_core.h"
#include "settings.h"
#include <climits>
#include <cmath>
@ -122,7 +124,6 @@ typedef union
} low_value;
// pgxp_mem.h
static u32 PGXP_ConvertAddress(u32 addr);
static PGXP_value* GetPtr(u32 addr);
static PGXP_value* ReadMem(u32 addr);
@ -233,56 +234,16 @@ void PGXP_InitMem()
}
}
u32 PGXP_ConvertAddress(u32 addr)
{
u32 paddr = addr;
switch (paddr >> 24)
{
case 0x80:
case 0xa0:
case 0x00:
// RAM further mirrored over 8MB
paddr = ((paddr & 0x7FFFFF) % 0x200000) >> 2;
paddr = UserMemOffset + paddr;
break;
default:
if ((paddr >> 20) == 0x1f8)
{
if (paddr >= 0x1f801000)
{
// paddr = ((paddr & 0xFFFF) - 0x1000);
// paddr = (paddr % 0x2000) >> 2;
paddr = ((paddr & 0xFFFF) - 0x1000) >> 2;
paddr = RegisterOffset + paddr;
break;
}
else
{
// paddr = ((paddr & 0xFFF) % 0x400) >> 2;
paddr = (paddr & 0x3FF) >> 2;
paddr = ScratchOffset + paddr;
break;
}
}
paddr = InvalidAddress;
break;
}
#ifdef GTE_LOG
// GTE_LOG("PGXP_Read %x [%x] |", addr, paddr);
#endif
return paddr;
}
ALWAYS_INLINE_RELEASE PGXP_value* GetPtr(u32 addr)
{
addr = PGXP_ConvertAddress(addr);
if ((addr & CPU::DCACHE_LOCATION_MASK) == CPU::DCACHE_LOCATION)
return &Mem[ScratchOffset + ((addr & CPU::DCACHE_OFFSET_MASK) >> 2)];
if (addr != InvalidAddress)
return &Mem[addr];
return NULL;
const u32 paddr = (addr & CPU::PHYSICAL_MEMORY_ADDRESS_MASK);
if (paddr < Bus::RAM_MIRROR_END)
return &Mem[(paddr & Bus::RAM_2MB_MASK) >> 2];
else
return nullptr;
}
ALWAYS_INLINE_RELEASE PGXP_value* ReadMem(u32 addr)
@ -1281,9 +1242,9 @@ void CPU_SLT(u32 instr, u32 rsVal, u32 rtVal)
ret.y = 0.f;
ret.compFlags[1] = VALID;
ret.x = (CPU_reg[rs(instr)].y < CPU_reg[rt(instr)].y) ?
1.f :
(f16Unsign(CPU_reg[rs(instr)].x) < f16Unsign(CPU_reg[rt(instr)].x)) ? 1.f : 0.f;
ret.x = (CPU_reg[rs(instr)].y < CPU_reg[rt(instr)].y) ? 1.f :
(f16Unsign(CPU_reg[rs(instr)].x) < f16Unsign(CPU_reg[rt(instr)].x)) ? 1.f :
0.f;
ret.value = BoolToUInt32(static_cast<s32>(rsVal) < static_cast<s32>(rtVal));
CPU_reg[rd(instr)] = ret;
@ -1307,9 +1268,9 @@ void CPU_SLTU(u32 instr, u32 rsVal, u32 rtVal)
ret.y = 0.f;
ret.compFlags[1] = VALID;
ret.x = (f16Unsign(CPU_reg[rs(instr)].y) < f16Unsign(CPU_reg[rt(instr)].y)) ?
1.f :
(f16Unsign(CPU_reg[rs(instr)].x) < f16Unsign(CPU_reg[rt(instr)].x)) ? 1.f : 0.f;
ret.x = (f16Unsign(CPU_reg[rs(instr)].y) < f16Unsign(CPU_reg[rt(instr)].y)) ? 1.f :
(f16Unsign(CPU_reg[rs(instr)].x) < f16Unsign(CPU_reg[rt(instr)].x)) ? 1.f :
0.f;
ret.value = BoolToUInt32(rsVal < rtVal);
CPU_reg[rd(instr)] = ret;