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MMU: optimize PTE lookup code 

Pull out calculation of PTE1 instead of comparing the separate parts.
This commit is contained in:
Fiora 2015-01-02 20:34:47 -08:00
parent 16e756cb39
commit 1ee83e332e
1 changed files with 23 additions and 31 deletions
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54
Source/Core/Core/HW/MemmapFunctions.cpp
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@ -713,52 +713,44 @@ static __forceinline u32 TranslatePageAddress(const u32 _Address, const XCheckTL
// hash function no 1 "xor" .360
u32 hash = (VSID ^ page_index);
u32 pte1 = bswap((VSID << 7) | api | PTE1_V);
for (int hash_func = 0; hash_func < 2; hash_func++)
{
// hash function no 2 "not" .360
if (hash_func == 1)
{
// hash function no 2 "not" .360
hash = ~hash;
pte1 |= PTE1_H << 24;
}
u32 pteg_addr = ((hash & PowerPC::ppcState.pagetable_hashmask) << 6) | PowerPC::ppcState.pagetable_base;
for (int i = 0; i < 8; i++)
for (int i = 0; i < 8; i++, pteg_addr += 8)
{
u32 pte = bswap(*(u32*)&base_mem[pteg_addr]);
bool pteh = (pte & PTE1_H) == 0;
if (hash_func == 1)
pteh = !pteh;
if ((pte & PTE1_V) && pteh)
if (pte1 == *(u32*)&base_mem[pteg_addr])
{
if (VSID == PTE1_VSID(pte) && (api == PTE1_API(pte)))
UPTE2 PTE2;
PTE2.Hex = bswap((*(u32*)&base_mem[(pteg_addr + 4)]));
// set the access bits
switch (_Flag)
{
UPTE2 PTE2;
PTE2.Hex = bswap((*(u32*)&base_mem[(pteg_addr + 4)]));
// set the access bits
switch (_Flag)
{
case FLAG_NO_EXCEPTION: break;
case FLAG_READ: PTE2.R = 1; break;
case FLAG_WRITE: PTE2.R = 1; PTE2.C = 1; break;
case FLAG_OPCODE: PTE2.R = 1; break;
}
if (_Flag != FLAG_NO_EXCEPTION)
*(u32*)&base_mem[(pteg_addr + 4)] = bswap(PTE2.Hex);
// We already updated the TLB entry if this was caused by a C bit.
if (res != TLB_UPDATE_C)
UpdateTLBEntry(_Flag, PTE2, _Address);
return (PTE2.RPN << 12) | offset;
case FLAG_NO_EXCEPTION: break;
case FLAG_READ: PTE2.R = 1; break;
case FLAG_WRITE: PTE2.R = 1; PTE2.C = 1; break;
case FLAG_OPCODE: PTE2.R = 1; break;
}
if (_Flag != FLAG_NO_EXCEPTION)
*(u32*)&base_mem[(pteg_addr + 4)] = bswap(PTE2.Hex);
// We already updated the TLB entry if this was caused by a C bit.
if (res != TLB_UPDATE_C)
UpdateTLBEntry(_Flag, PTE2, _Address);
return (PTE2.RPN << 12) | offset;
}
pteg_addr += 8;
}
}
return 0;