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[AArch64] Improves the register cache.

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Removes the REG_AWAY nonsense I was doing. I've got to get the JIT more up to speed before thinking of insane register cache things.
Also fixes a bug in immediate setting where if the register being set to an immediate already had a host register tied to it then it wouldn't free the
register it had. Resulting in register exhaustion.
This commit is contained in:
Ryan Houdek 2014-12-02 18:12:41 -06:00
parent 2c39d4044d
commit c3c80e9440
2 changed files with 23 additions and 227 deletions
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221
Source/Core/Core/PowerPC/JitArm64/JitArm64_RegCache.cpp
View File

@ -63,45 +63,6 @@ void Arm64RegCache::UnlockRegister(ARM64Reg host_reg)
// GPR Cache
void Arm64GPRCache::Start(PPCAnalyst::BlockRegStats &stats)
{
// To make this technique easy, let's just work on pairs of even/odd registers
// We could do simple odd/even as well to get a few spare temporary registers
// but it isn't really needed, we aren't starved for registers
for (int reg = 0; reg < 32; reg += 2)
{
u32 regs_used = (stats.IsUsed(reg) << 1) | stats.IsUsed(reg + 1);
switch (regs_used)
{
case 0x02: // Reg+0 used
{
ARM64Reg host_reg = GetReg();
m_guest_registers[reg].LoadToReg(host_reg);
m_emit->LDR(INDEX_UNSIGNED, host_reg, X29, PPCSTATE_OFF(gpr[reg]));
}
break;
case 0x01: // Reg+1 used
{
ARM64Reg host_reg = GetReg();
m_guest_registers[reg + 1].LoadToReg(host_reg);
m_emit->LDR(INDEX_UNSIGNED, host_reg, X29, PPCSTATE_OFF(gpr[reg + 1]));
}
break;
case 0x03: // Both registers used
{
// Get a 64bit host register
ARM64Reg host_reg = EncodeRegTo64(GetReg());
m_guest_registers[reg].LoadToAway(host_reg, REG_LOW);
m_guest_registers[reg + 1].LoadToAway(host_reg, REG_HIGH);
// host_reg is 64bit here.
// It'll load both guest_registers in one LDR
m_emit->LDR(INDEX_UNSIGNED, host_reg, X29, PPCSTATE_OFF(gpr[reg]));
}
break;
case 0x00: // Neither used
default:
break;
}
}
}
bool Arm64GPRCache::IsCalleeSaved(ARM64Reg reg)
@ -116,77 +77,34 @@ bool Arm64GPRCache::IsCalleeSaved(ARM64Reg reg)
void Arm64GPRCache::FlushRegister(u32 preg)
{
u32 base_reg = preg;
OpArg& reg = m_guest_registers[preg];
if (reg.GetType() == REG_REG)
{
ARM64Reg host_reg = reg.GetReg();
m_emit->STR(INDEX_UNSIGNED, host_reg, X29, PPCSTATE_OFF(gpr[preg]));
Unlock(host_reg);
UnlockRegister(host_reg);
reg.Flush();
}
else if (reg.GetType() == REG_IMM)
{
ARM64Reg host_reg = GetReg();
m_emit->MOVI2R(host_reg, reg.GetImm());
m_emit->STR(INDEX_UNSIGNED, host_reg, X29, PPCSTATE_OFF(gpr[preg]));
Unlock(host_reg);
reg.Flush();
}
else if (reg.GetType() == REG_AWAY)
{
u32 next_reg = 0;
if (reg.GetAwayLocation() == REG_LOW)
next_reg = base_reg + 1;
else
next_reg = base_reg - 1;
OpArg& reg2 = m_guest_registers[next_reg];
ARM64Reg host_reg = reg.GetAwayReg();
ARM64Reg host_reg_1 = reg.GetReg();
ARM64Reg host_reg_2 = reg2.GetReg();
// Flush if either of these shared registers are used.
if (host_reg_1 == INVALID_REG)
if (!reg.GetImm())
{
// We never loaded this register
// We've got to test the state of our shared register
// Currently it is always reg+1
if (host_reg_2 == INVALID_REG)
{
// We didn't load either of these registers
// This can happen in cases where we had to flush register state
// or if we hit an interpreted instruction before we could use it
// Dump the whole thing in one go and flush both registers
// 64bit host register will store 2 32bit store registers in one go
if (reg.GetAwayLocation() == REG_LOW)
m_emit->STR(INDEX_UNSIGNED, host_reg, X29, PPCSTATE_OFF(gpr[base_reg]));
else
m_emit->STR(INDEX_UNSIGNED, host_reg, X29, PPCSTATE_OFF(gpr[next_reg]));
}
else
{
// Alright, bottom register isn't used, but top one is
// Only store the top one
m_emit->STR(INDEX_UNSIGNED, host_reg_2, X29, PPCSTATE_OFF(gpr[next_reg]));
Unlock(host_reg_2);
}
m_emit->STR(INDEX_UNSIGNED, WSP, X29, PPCSTATE_OFF(gpr[preg]));
}
else
{
m_emit->STR(INDEX_UNSIGNED, host_reg_1, X29, PPCSTATE_OFF(gpr[base_reg]));
Unlock(host_reg_1);
}
// Flush both registers
reg.Flush();
reg2.Flush();
Unlock(DecodeReg(host_reg));
}
ARM64Reg host_reg = GetReg();
m_emit->MOVI2R(host_reg, reg.GetImm());
m_emit->STR(INDEX_UNSIGNED, host_reg, X29, PPCSTATE_OFF(gpr[preg]));
UnlockRegister(host_reg);
}
reg.Flush();
}
}
void Arm64GPRCache::Flush(FlushMode mode, PPCAnalyst::CodeOp* op)
@ -196,11 +114,7 @@ void Arm64GPRCache::Flush(FlushMode mode, PPCAnalyst::CodeOp* op)
bool flush = true;
if (mode == FLUSH_INTERPRETER)
{
if (!(op->regsOut[0] == i ||
op->regsOut[1] == i ||
op->regsIn[0] == i ||
op->regsIn[1] == i ||
op->regsIn[2] == i))
if (!(op->regsOut[i] || op->regsIn[i]))
{
// This interpreted instruction doesn't use this register
flush = false;
@ -219,39 +133,6 @@ void Arm64GPRCache::Flush(FlushMode mode, PPCAnalyst::CodeOp* op)
if (flush)
FlushRegister(i);
}
else if (m_guest_registers[i].GetType() == REG_AWAY)
{
// We are away, that means that this register and the next are stored in a single 64bit register
// There is a very good chance that both the registers are out in some "temp" register
bool flush_2 = true;
if (mode == FLUSH_INTERPRETER)
{
if (!(op->regsOut[0] == (i + 1) ||
op->regsOut[1] == (i + 1) ||
op->regsIn[0] == (i + 1) ||
op->regsIn[1] == (i + 1) ||
op->regsIn[2] == (i + 1)))
{
// This interpreted instruction doesn't use this register
flush_2 = false;
}
}
ARM64Reg host_reg = m_guest_registers[i].GetAwayReg();
ARM64Reg host_reg_1 = m_guest_registers[i].GetReg();
ARM64Reg host_reg_2 = m_guest_registers[i + 1].GetReg();
// Flush if either of these shared registers are used.
if (flush ||
flush_2 ||
!IsCalleeSaved(host_reg) ||
!IsCalleeSaved(host_reg_1) ||
!IsCalleeSaved(host_reg_2))
{
FlushRegister(i); // Will flush both pairs of registers
}
// Skip the next register since we've handled it here
++i;
}
}
}
@ -274,71 +155,6 @@ ARM64Reg Arm64GPRCache::R(u32 preg)
return host_reg;
}
break;
case REG_AWAY: // Register is away in a shared register
{
// Let's do the voodoo that we dodo
if (reg.GetReg() == INVALID_REG)
{
// Alright, we need to extract from our away register
// To our new 32bit register
if (reg.GetAwayLocation() == REG_LOW)
{
OpArg& upper_reg = m_guest_registers[preg + 1];
if (upper_reg.GetType() == REG_REG)
{
// If the upper reg is already moved away, just claim this one as ours now
ARM64Reg host_reg = reg.GetAwayReg();
reg.LoadToReg(DecodeReg(host_reg));
return host_reg;
}
else
{
// Top register is still loaded
// Make sure to move to a new register
ARM64Reg host_reg = GetReg();
ARM64Reg current_reg = reg.GetAwayReg();
reg.LoadToReg(host_reg);
// We are in the low bits
// Just move it over to the low bits of the new register
m_emit->UBFM(EncodeRegTo64(host_reg), current_reg, 0, 31);
return host_reg;
}
}
else
{
OpArg& lower_reg = m_guest_registers[preg - 1];
if (lower_reg.GetType() == REG_REG)
{
// If the lower register is moved away, claim this one as ours
ARM64Reg host_reg = reg.GetAwayReg();
reg.LoadToReg(DecodeReg(host_reg));
// Make sure to move our register from the high bits to the low bits
m_emit->UBFM(EncodeRegTo64(host_reg), host_reg, 32, 63);
return host_reg;
}
else
{
// Load this register in to the new low bits
// We are no longer away
ARM64Reg host_reg = GetReg();
ARM64Reg current_reg = reg.GetAwayReg();
reg.LoadToReg(host_reg);
// We are in the high bits
m_emit->UBFM(EncodeRegTo64(host_reg), current_reg, 32, 63);
return host_reg;
}
}
}
else
{
// We've already moved to a valid place to work on
return reg.GetReg();
}
}
break;
case REG_NOTLOADED: // Register isn't loaded at /all/
{
// This is a bit annoying. We try to keep these preloaded as much as possible
@ -357,6 +173,14 @@ ARM64Reg Arm64GPRCache::R(u32 preg)
return INVALID_REG;
}
void Arm64GPRCache::SetImmediate(u32 preg, u32 imm)
{
OpArg& reg = m_guest_registers[preg];
if (reg.GetType() == REG_REG)
Unlock(reg.GetReg());
reg.LoadToImm(imm);
}
void Arm64GPRCache::GetAllocationOrder()
{
// Callee saved registers first in hopes that we will keep everything stored there first
@ -380,8 +204,7 @@ void Arm64GPRCache::FlushMostStaleRegister()
{
u32 last_used = m_guest_registers[i].GetLastUsed();
if (last_used > most_stale_amount &&
m_guest_registers[i].GetType() != REG_IMM &&
m_guest_registers[i].GetType() != REG_NOTLOADED)
m_guest_registers[i].GetType() == REG_REG)
{
most_stale_preg = i;
most_stale_amount = last_used;

29
Source/Core/Core/PowerPC/JitArm64/JitArm64_RegCache.h
View File

@ -19,7 +19,6 @@ enum RegType
REG_NOTLOADED = 0,
REG_REG, // Reg type is register
REG_IMM, // Reg is really a IMM
REG_AWAY, // Reg is away
};
enum RegLocation
{
@ -56,14 +55,6 @@ public:
{
return m_reg;
}
ARM64Reg GetAwayReg()
{
return m_away_reg;
}
RegLocation GetAwayLocation()
{
return m_away_location;
}
u32 GetImm()
{
return m_value;
@ -72,16 +63,6 @@ public:
{
m_type = REG_REG;
m_reg = reg;
m_away_reg = INVALID_REG;
}
void LoadToAway(ARM64Reg reg, RegLocation location)
{
m_type = REG_AWAY;
m_away_reg = reg;
m_away_location = location;
m_reg = INVALID_REG;
}
void LoadToImm(u32 imm)
{
@ -89,14 +70,12 @@ public:
m_value = imm;
m_reg = INVALID_REG;
m_away_reg = INVALID_REG;
}
void Flush()
{
// Invalidate any previous information
m_type = REG_NOTLOADED;
m_reg = INVALID_REG;
m_away_reg = INVALID_REG;
// Arbitrarily large value that won't roll over on a lot of increments
m_last_used = 0xFFFF;
@ -111,12 +90,6 @@ private:
RegType m_type; // store type
ARM64Reg m_reg; // host register we are in
// For REG_AWAY
// Host register that we are away in
// This is a 64bit register
ARM64Reg m_away_reg;
RegLocation m_away_location;
// For REG_IMM
u32 m_value; // IMM value
@ -227,7 +200,7 @@ public:
ARM64Reg R(u32 preg);
// Set a register to an immediate
void SetImmediate(u32 reg, u32 imm) { m_guest_registers[reg].LoadToImm(imm); }
void SetImmediate(u32 preg, u32 imm);
// Returns if a register is set as an immediate
bool IsImm(u32 reg) { return m_guest_registers[reg].GetType() == REG_IMM; }