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Commit 1a3d77c9 authored by Geo Ster's avatar Geo Ster
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Minor branch optimization 

* On reads/writes it is important to check the address alignment before
proceeding with the operation. However unalignment errors almost
never happen in real world games, so let the compiler know that these
branches are unlikely to happen to speed them up a bit.
parent 1d16fdad
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src/cpu/ee/ee.cpp
+ 10
− 10
View file @ 1a3d77c9
......@@ -258,7 +258,7 @@ namespace ee
uint32_t data = gpr[rt].word[0];
log("SW: Writing GPR[{:d}] ({:#x}) to address {:#x} = GPR[{:d}] ({:#x}) + {:d}\n", rt, data, vaddr, base, gpr[base].word[0], offset);
if (vaddr & 0x3)
if (vaddr & 0x3) [[unlikely]]
{
log("[ERROR] SW: Address {:#x} is not aligned\n", vaddr);
exception(Exception::AddrErrorStore);
......@@ -388,7 +388,7 @@ namespace ee
uint32_t data = fpr[ft].word[0];
log("SWC1: Writing FPR[{:d}] ({:#x}) to address {:#x} = GPR[{:d}] ({:#x}) + {:d}\n", ft, data, vaddr, base, gpr[base].word[0], offset);
if ((vaddr & 0b11) != 0)
if ((vaddr & 0b11) != 0) [[unlikely]]
{
log("[ERROR] SW: Address {:#x} is not aligned\n", vaddr);
std::exit(1); /* NOTE: SignalException (AddressError) */
......@@ -418,7 +418,7 @@ namespace ee
uint32_t vaddr = offset + gpr[base].word[0];
log("LD: GPR[{:d}] = {:#x} from address {:#x} = GPR[{:d}] ({:#x}) + {:#x}\n", rt, gpr[rt].dword[0], vaddr, base, gpr[base].word[0], offset);
if (vaddr & 0x7)
if (vaddr & 0x7) [[unlikely]]
{
log("[ERROR] LD: Address {:#x} is not aligned\n", vaddr);
exception(Exception::AddrErrorLoad);
......@@ -465,7 +465,7 @@ namespace ee
log("DIV: LO0 = GPR[{:d}] ({:#x}) / GPR[{:d}] ({:#x})\n", rs, gpr[rs].word[0], rt, gpr[rt].word[0]);
}
else
else [[unlikely]]
{
log("[ERROR] DIV: Division by zero!\n");
std::abort();
......@@ -612,7 +612,7 @@ namespace ee
uint16_t data = gpr[rt].word[0] & 0xFFFF;
log("SH: Writing GPR[{:d}] ({:#x}) to address {:#x} = GPR[{:d}] ({:#x}) + {:d}\n", rt, data, vaddr, base, gpr[base].word[0], offset);
if (vaddr & 0x1)
if (vaddr & 0x1) [[unlikely]]
{
log("[ERROR] SH: Address {:#x} is not aligned\n", vaddr);
exception(Exception::AddrErrorStore);
......@@ -650,7 +650,7 @@ namespace ee
log("DIVU1: GPR[{:d}] ({:#x}) / GPR[{:d}] ({:#x}) OUTPUT LO1 = {:#x} and HI1 = {:#x}\n", rs, gpr[rs].word[0], rt, gpr[rt].word[0], lo1, hi1);
}
else
else [[unlikely]]
{
log("[ERROR] DIVU1: Division by zero!\n");
std::abort();
......@@ -774,7 +774,7 @@ namespace ee
uint32_t vaddr = offset + gpr[base].word[0];
log("LHU: GPR[{:d}] = {:#x} from address {:#x} = GPR[{:d}] ({:#x}) + {:#x}\n", rt, gpr[rt].dword[0], vaddr, base, gpr[base].word[0], offset);
if (vaddr & 0x1)
if (vaddr & 0x1) [[unlikely]]
{
log("[ERROR] LHU: Address {:#x} is not aligned\n", vaddr);
exception(Exception::AddrErrorLoad);
......@@ -814,7 +814,7 @@ namespace ee
uint32_t vaddr = offset + gpr[base].word[0];
log("LW: GPR[{:d}] = {:#x} from address {:#x} = GPR[{:d}] ({:#x}) + {:#x}\n", rt, gpr[rt].dword[0], vaddr, base, gpr[base].word[0], offset);
if (vaddr & 0x3)
if (vaddr & 0x3) [[unlikely]]
{
log("[ERROR] LW: Address {:#x} is not aligned\n", vaddr);
exception(Exception::AddrErrorLoad);
......@@ -903,7 +903,7 @@ namespace ee
uint64_t data = gpr[rt].dword[0];
log("SD: Writing GPR[{:d}] ({:#x}) to address {:#x} = GPR[{:d}] ({:#x}) + {:#x}\n", rt, data, vaddr, base, gpr[base].word[0], offset);
if (vaddr & 0x7)
if (vaddr & 0x7) [[unlikely]]
{
log("[ERROR] SD: Address {:#x} is not aligned\n", vaddr);
exception(Exception::AddrErrorStore);
......@@ -1037,7 +1037,7 @@ namespace ee
log("DIVU: GPR[{:d}] ({:#x}) / GPR[{:d}] ({:#x}) OUTPUT LO0 = {:#x} and HI0 = {:#x}\n", rs, gpr[rs].word[0], rt, gpr[rt].word[0], lo0, hi0);
}
else
else [[unlikely]]
{
log("[ERROR] DIVU: Division by zero!\n");
std::abort();
......
src/cpu/iop/iop.cpp
+ 9
− 9
View file @ 1a3d77c9
......@@ -139,7 +139,7 @@ namespace iop
instr = next_instr;
/* Check aligment errors. */
if (pc & 0x3)
if (pc & 0x3) [[unlikely]]
{
cop0.BadA = pc;
exception(Exception::ReadError);
......@@ -482,7 +482,7 @@ namespace iop
uint32_t vaddr = gpr[base] + offset;
if (!cop0.sr.IsC)
{
if (vaddr & 0x1)
if (vaddr & 0x1) [[unlikely]]
{
cop0.BadA = vaddr;
exception(Exception::ReadError);
......@@ -518,7 +518,7 @@ namespace iop
uint32_t vaddr = gpr[base] + offset;
if (!cop0.sr.IsC)
{
if (vaddr & 0x1)
if (vaddr & 0x1) [[unlikely]]
{
cop0.BadA = vaddr;
exception(Exception::ReadError, 0);
......@@ -596,7 +596,7 @@ namespace iop
uint32_t dividend = gpr[rs];
uint32_t divisor = gpr[rt];
if (divisor == 0)
if (divisor == 0) [[unlikely]]
{
hi = dividend;
lo = 0xFFFFFFFF;
......@@ -648,12 +648,12 @@ namespace iop
int32_t dividend = (int32_t)gpr[rs];
int32_t divisor = (int32_t)gpr[rt];
if (divisor == 0)
if (divisor == 0) [[unlikely]]
{
hi = gpr[rs];
lo = (dividend >= 0 ? 0xFFFFFFFF : 1);
}
else if (gpr[rs] == 0x80000000 && divisor == -1)
else if (gpr[rs] == 0x80000000 && divisor == -1) [[unlikely]]
{
hi = 0;
lo = 0x80000000;
......@@ -879,7 +879,7 @@ namespace iop
uint32_t vaddr = gpr[base] + offset;
if (!cop0.sr.IsC)
{
if (vaddr & 0x1)
if (vaddr & 0x1) [[unlikely]]
{
cop0.BadA = vaddr;
exception(Exception::WriteError, 0);
......@@ -925,7 +925,7 @@ namespace iop
uint32_t vaddr = gpr[base] + offset;
if (!cop0.sr.IsC)
{
if (vaddr & 0x3)
if (vaddr & 0x3) [[unlikely]]
{
cop0.BadA = vaddr;
exception(Exception::ReadError, 0);
......@@ -1029,7 +1029,7 @@ namespace iop
uint32_t vaddr = gpr[base] + offset;
if (!cop0.sr.IsC)
{
if (vaddr & 0x3)
if (vaddr & 0x3) [[unlikely]]
{
cop0.BadA = vaddr;
exception(Exception::WriteError, 0);
......
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