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JitArm64_SystemRegisters.cpp
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JitArm64_SystemRegisters.cpp
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// Copyright 2014 Dolphin Emulator Project
// SPDX-License-Identifier: GPL-2.0-or-later
#include "Core/PowerPC/JitArm64/Jit.h"
#include <array>
#include "Common/Arm64Emitter.h"
#include "Common/Assert.h"
#include "Common/CommonTypes.h"
#include "Common/MathUtil.h"
#include "Common/SmallVector.h"
#include "Core/Core.h"
#include "Core/CoreTiming.h"
#include "Core/PowerPC/Interpreter/ExceptionUtils.h"
#include "Core/PowerPC/PPCTables.h"
#include "Core/PowerPC/PowerPC.h"
#include "Core/System.h"
using namespace Arm64Gen;
FixupBranch JitArm64::JumpIfCRFieldBit(int field, int bit, bool jump_if_set)
{
ARM64Reg XA = gpr.CR(field);
ARM64Reg WA = EncodeRegTo32(XA);
switch (bit)
{
case PowerPC::CR_SO_BIT: // check bit 59 set
return jump_if_set ? TBNZ(XA, PowerPC::CR_EMU_SO_BIT) : TBZ(XA, PowerPC::CR_EMU_SO_BIT);
case PowerPC::CR_EQ_BIT: // check bits 31-0 == 0
return jump_if_set ? CBZ(WA) : CBNZ(WA);
case PowerPC::CR_GT_BIT: // check val > 0
CMP(XA, ARM64Reg::SP);
return B(jump_if_set ? CC_GT : CC_LE);
case PowerPC::CR_LT_BIT: // check bit 62 set
return jump_if_set ? TBNZ(XA, PowerPC::CR_EMU_LT_BIT) : TBZ(XA, PowerPC::CR_EMU_LT_BIT);
default:
ASSERT_MSG(DYNA_REC, false, "Invalid CR bit");
return {};
}
}
void JitArm64::FixGTBeforeSettingCRFieldBit(Arm64Gen::ARM64Reg reg)
{
// Gross but necessary; if the input is totally zero and we set SO or LT,
// or even just add the (1<<32), GT will suddenly end up set without us
// intending to. This can break actual games, so fix it up.
ARM64Reg WA = gpr.GetReg();
ARM64Reg XA = EncodeRegTo64(WA);
ORR(XA, reg, LogicalImm(1ULL << 63, 64));
CMP(reg, ARM64Reg::ZR);
CSEL(reg, reg, XA, CC_NEQ);
gpr.Unlock(WA);
}
void JitArm64::UpdateFPExceptionSummary(ARM64Reg fpscr)
{
ARM64Reg WA = gpr.GetReg();
// fpscr.VX = (fpscr & FPSCR_VX_ANY) != 0
MOVI2R(WA, FPSCR_VX_ANY);
TST(WA, fpscr);
CSET(WA, CCFlags::CC_NEQ);
BFI(fpscr, WA, MathUtil::IntLog2(FPSCR_VX), 1);
// fpscr.FEX = ((fpscr >> 22) & (fpscr & FPSCR_ANY_E)) != 0
AND(WA, fpscr, LogicalImm(FPSCR_ANY_E, 32));
TST(WA, fpscr, ArithOption(fpscr, ShiftType::LSR, 22));
CSET(WA, CCFlags::CC_NEQ);
BFI(fpscr, WA, MathUtil::IntLog2(FPSCR_FEX), 1);
gpr.Unlock(WA);
}
void JitArm64::UpdateRoundingMode()
{
const BitSet32 gprs_to_save = gpr.GetCallerSavedUsed();
const BitSet32 fprs_to_save = fpr.GetCallerSavedUsed();
ABI_PushRegisters(gprs_to_save);
m_float_emit.ABI_PushRegisters(fprs_to_save, ARM64Reg::X8);
ABI_CallFunction(&PowerPC::RoundingModeUpdated, &m_ppc_state);
m_float_emit.ABI_PopRegisters(fprs_to_save, ARM64Reg::X8);
ABI_PopRegisters(gprs_to_save);
}
void JitArm64::mtmsr(UGeckoInstruction inst)
{
INSTRUCTION_START
JITDISABLE(bJITSystemRegistersOff);
FALLBACK_IF(jo.fp_exceptions);
gpr.BindToRegister(inst.RS, true);
STR(IndexType::Unsigned, gpr.R(inst.RS), PPC_REG, PPCSTATE_OFF(msr));
EmitStoreMembase(gpr.R(inst.RS));
gpr.Flush(FlushMode::All, ARM64Reg::INVALID_REG);
fpr.Flush(FlushMode::All, ARM64Reg::INVALID_REG);
// Our jit cache also stores some MSR bits, as they have changed, we either
// have to validate them in the BLR/RET check, or just flush the stack here.
ResetStack();
WriteExceptionExit(js.compilerPC + 4, true);
}
void JitArm64::mfmsr(UGeckoInstruction inst)
{
INSTRUCTION_START
JITDISABLE(bJITSystemRegistersOff);
gpr.BindToRegister(inst.RD, false);
LDR(IndexType::Unsigned, gpr.R(inst.RD), PPC_REG, PPCSTATE_OFF(msr));
}
void JitArm64::mcrf(UGeckoInstruction inst)
{
INSTRUCTION_START
JITDISABLE(bJITSystemRegistersOff);
if (inst.CRFS != inst.CRFD)
{
gpr.BindCRToRegister(inst.CRFD, false);
MOV(gpr.CR(inst.CRFD), gpr.CR(inst.CRFS));
}
}
void JitArm64::mcrxr(UGeckoInstruction inst)
{
INSTRUCTION_START
JITDISABLE(bJITSystemRegistersOff);
gpr.BindCRToRegister(inst.CRFD, false);
ARM64Reg WA = gpr.GetReg();
ARM64Reg XA = EncodeRegTo64(WA);
ARM64Reg XB = gpr.CR(inst.CRFD);
ARM64Reg WB = EncodeRegTo32(XB);
// Copy XER[0-3] into CR[inst.CRFD]
LDRB(IndexType::Unsigned, WA, PPC_REG, PPCSTATE_OFF(xer_ca));
LDRB(IndexType::Unsigned, WB, PPC_REG, PPCSTATE_OFF(xer_so_ov));
// [0 SO OV CA]
BFI(WA, WB, 1, 2);
// [SO OV CA 0] << 3
LSL(WA, WA, 4);
MOVP2R(XB, PowerPC::ConditionRegister::s_crTable.data());
LDR(XB, XB, XA);
// Clear XER[0-3]
static_assert(PPCSTATE_OFF(xer_ca) + 1 == PPCSTATE_OFF(xer_so_ov));
STRH(IndexType::Unsigned, ARM64Reg::WZR, PPC_REG, PPCSTATE_OFF(xer_ca));
gpr.Unlock(WA);
}
void JitArm64::mfsr(UGeckoInstruction inst)
{
INSTRUCTION_START
JITDISABLE(bJITSystemRegistersOff);
gpr.BindToRegister(inst.RD, false);
LDR(IndexType::Unsigned, gpr.R(inst.RD), PPC_REG, PPCSTATE_OFF_SR(inst.SR));
}
void JitArm64::mtsr(UGeckoInstruction inst)
{
INSTRUCTION_START
JITDISABLE(bJITSystemRegistersOff);
gpr.BindToRegister(inst.RS, true);
STR(IndexType::Unsigned, gpr.R(inst.RS), PPC_REG, PPCSTATE_OFF_SR(inst.SR));
}
void JitArm64::mfsrin(UGeckoInstruction inst)
{
INSTRUCTION_START
JITDISABLE(bJITSystemRegistersOff);
u32 b = inst.RB, d = inst.RD;
gpr.BindToRegister(d, d == b);
ARM64Reg index = gpr.GetReg();
ARM64Reg index64 = EncodeRegTo64(index);
ARM64Reg RB = gpr.R(b);
UBFM(index, RB, 28, 31);
ADD(index64, PPC_REG, index64, ArithOption(index64, ShiftType::LSL, 2));
LDR(IndexType::Unsigned, gpr.R(d), index64, PPCSTATE_OFF_SR(0));
gpr.Unlock(index);
}
void JitArm64::mtsrin(UGeckoInstruction inst)
{
INSTRUCTION_START
JITDISABLE(bJITSystemRegistersOff);
u32 b = inst.RB, d = inst.RD;
gpr.BindToRegister(d, d == b);
ARM64Reg index = gpr.GetReg();
ARM64Reg index64 = EncodeRegTo64(index);
ARM64Reg RB = gpr.R(b);
UBFM(index, RB, 28, 31);
ADD(index64, PPC_REG, index64, ArithOption(index64, ShiftType::LSL, 2));
STR(IndexType::Unsigned, gpr.R(d), index64, PPCSTATE_OFF_SR(0));
gpr.Unlock(index);
}
void JitArm64::twx(UGeckoInstruction inst)
{
INSTRUCTION_START
JITDISABLE(bJITSystemRegistersOff);
s32 a = inst.RA;
ARM64Reg WA = gpr.GetReg();
if (inst.OPCD == 3) // twi
{
CMPI2R(gpr.R(a), (s32)(s16)inst.SIMM_16, WA);
}
else // tw
{
CMP(gpr.R(a), gpr.R(inst.RB));
}
constexpr std::array<CCFlags, 5> conditions{{CC_LT, CC_GT, CC_EQ, CC_VC, CC_VS}};
Common::SmallVector<FixupBranch, conditions.size()> fixups;
for (int i = 0; i < conditions.size(); i++)
{
if (inst.TO & (1 << i))
{
FixupBranch f = B(conditions[i]);
fixups.push_back(f);
}
}
FixupBranch dont_trap = B();
for (const FixupBranch& fixup : fixups)
{
SetJumpTarget(fixup);
}
FixupBranch far_addr = B();
SwitchToFarCode();
SetJumpTarget(far_addr);
gpr.Flush(FlushMode::MaintainState, WA);
fpr.Flush(FlushMode::MaintainState, ARM64Reg::INVALID_REG);
LDR(IndexType::Unsigned, WA, PPC_REG, PPCSTATE_OFF(Exceptions));
ORR(WA, WA, LogicalImm(EXCEPTION_PROGRAM, 32));
STR(IndexType::Unsigned, WA, PPC_REG, PPCSTATE_OFF(Exceptions));
MOVI2R(WA, static_cast<u32>(ProgramExceptionCause::Trap));
STR(IndexType::Unsigned, WA, PPC_REG, PPCSTATE_OFF_SPR(SPR_SRR1));
WriteExceptionExit(js.compilerPC, false, true);
SwitchToNearCode();
SetJumpTarget(dont_trap);
if (!analyzer.HasOption(PPCAnalyst::PPCAnalyzer::OPTION_CONDITIONAL_CONTINUE))
{
gpr.Flush(FlushMode::All, WA);
fpr.Flush(FlushMode::All, ARM64Reg::INVALID_REG);
WriteExit(js.compilerPC + 4);
}
gpr.Unlock(WA);
}
void JitArm64::mfspr(UGeckoInstruction inst)
{
INSTRUCTION_START
JITDISABLE(bJITSystemRegistersOff);
u32 iIndex = (inst.SPRU << 5) | (inst.SPRL & 0x1F);
int d = inst.RD;
switch (iIndex)
{
case SPR_TL:
case SPR_TU:
{
ARM64Reg Wg = gpr.GetReg();
ARM64Reg Xg = EncodeRegTo64(Wg);
ARM64Reg Wresult = gpr.GetReg();
ARM64Reg Xresult = EncodeRegTo64(Wresult);
ARM64Reg WA = gpr.GetReg();
ARM64Reg WB = gpr.GetReg();
ARM64Reg XA = EncodeRegTo64(WA);
ARM64Reg XB = EncodeRegTo64(WB);
ARM64Reg VC = fpr.GetReg();
ARM64Reg VD = fpr.GetReg();
ARM64Reg SC = EncodeRegToSingle(VC);
ARM64Reg SD = EncodeRegToSingle(VD);
// An inline implementation of CoreTiming::GetFakeTimeBase, since in timer-heavy games the
// cost of calling out to C for this is actually significant.
auto& core_timing_globals = m_system.GetCoreTiming().GetGlobals();
MOVP2R(Xg, &core_timing_globals);
LDR(IndexType::Unsigned, WA, PPC_REG, PPCSTATE_OFF(downcount));
m_float_emit.SCVTF(SC, WA);
m_float_emit.LDR(32, IndexType::Unsigned, SD, Xg,
offsetof(CoreTiming::Globals, last_OC_factor_inverted));
m_float_emit.FMUL(SC, SC, SD);
m_float_emit.FCVTS(Xresult, SC, RoundingMode::Z);
LDP(IndexType::Signed, XA, XB, Xg, offsetof(CoreTiming::Globals, global_timer));
SXTW(XB, WB);
SUB(Xresult, XB, Xresult);
ADD(Xresult, Xresult, XA);
// It might seem convenient to correct the timer for the block position here for even more
// accurate timing, but as of currently, this can break games. If we end up reading a time
// *after* the time at which an interrupt was supposed to occur, e.g. because we're 100 cycles
// into a block with only 50 downcount remaining, some games don't function correctly, such as
// Karaoke Party Revolution, which won't get past the loading screen.
LDP(IndexType::Signed, XA, XB, Xg, offsetof(CoreTiming::Globals, fake_TB_start_value));
SUB(Xresult, Xresult, XB);
// a / 12 = (a * 0xAAAAAAAAAAAAAAAB) >> 67
ORR(XB, ARM64Reg::ZR, LogicalImm(0xAAAAAAAAAAAAAAAA, 64));
ADD(XB, XB, 1);
UMULH(Xresult, Xresult, XB);
ADD(Xresult, XA, Xresult, ArithOption(Xresult, ShiftType::LSR, 3));
STR(IndexType::Unsigned, Xresult, PPC_REG, PPCSTATE_OFF_SPR(SPR_TL));
static_assert((PPCSTATE_OFF_SPR(SPR_TL) & 0x7) == 0);
if (CanMergeNextInstructions(1))
{
const UGeckoInstruction& next = js.op[1].inst;
// Two calls of TU/TL next to each other are extremely common in typical usage, so merge them
// if we can.
u32 nextIndex = (next.SPRU << 5) | (next.SPRL & 0x1F);
// Be careful; the actual opcode is for mftb (371), not mfspr (339)
int n = next.RD;
if (next.OPCD == 31 && next.SUBOP10 == 371 && (nextIndex == SPR_TU || nextIndex == SPR_TL) &&
n != d)
{
js.downcountAmount++;
js.skipInstructions = 1;
gpr.BindToRegister(d, false);
gpr.BindToRegister(n, false);
if (iIndex == SPR_TL)
MOV(gpr.R(d), Wresult);
else
LSR(EncodeRegTo64(gpr.R(d)), Xresult, 32);
if (nextIndex == SPR_TL)
MOV(gpr.R(n), Wresult);
else
LSR(EncodeRegTo64(gpr.R(n)), Xresult, 32);
gpr.Unlock(Wg, Wresult, WA, WB);
fpr.Unlock(VC, VD);
break;
}
}
gpr.BindToRegister(d, false);
if (iIndex == SPR_TU)
LSR(EncodeRegTo64(gpr.R(d)), Xresult, 32);
else
MOV(gpr.R(d), Wresult);
gpr.Unlock(Wg, Wresult, WA, WB);
fpr.Unlock(VC, VD);
}
break;
case SPR_XER:
{
gpr.BindToRegister(d, false);
ARM64Reg RD = gpr.R(d);
ARM64Reg WA = gpr.GetReg();
LDRH(IndexType::Unsigned, RD, PPC_REG, PPCSTATE_OFF(xer_stringctrl));
LDRB(IndexType::Unsigned, WA, PPC_REG, PPCSTATE_OFF(xer_ca));
ORR(RD, RD, WA, ArithOption(WA, ShiftType::LSL, XER_CA_SHIFT));
LDRB(IndexType::Unsigned, WA, PPC_REG, PPCSTATE_OFF(xer_so_ov));
ORR(RD, RD, WA, ArithOption(WA, ShiftType::LSL, XER_OV_SHIFT));
gpr.Unlock(WA);
}
break;
case SPR_WPAR:
case SPR_DEC:
case SPR_PMC1:
case SPR_PMC2:
case SPR_PMC3:
case SPR_PMC4:
case SPR_UPMC1:
case SPR_UPMC2:
case SPR_UPMC3:
case SPR_UPMC4:
case SPR_IABR:
FALLBACK_IF(true);
default:
gpr.BindToRegister(d, false);
ARM64Reg RD = gpr.R(d);
LDR(IndexType::Unsigned, RD, PPC_REG, PPCSTATE_OFF_SPR(iIndex));
break;
}
}
void JitArm64::mftb(UGeckoInstruction inst)
{
INSTRUCTION_START
JITDISABLE(bJITSystemRegistersOff);
mfspr(inst);
}
void JitArm64::mtspr(UGeckoInstruction inst)
{
INSTRUCTION_START
JITDISABLE(bJITSystemRegistersOff);
u32 iIndex = (inst.SPRU << 5) | (inst.SPRL & 0x1F);
switch (iIndex)
{
case SPR_DMAU:
case SPR_SPRG0:
case SPR_SPRG1:
case SPR_SPRG2:
case SPR_SPRG3:
case SPR_SRR0:
case SPR_SRR1:
// These are safe to do the easy way, see the bottom of this function.
break;
case SPR_LR:
case SPR_CTR:
case SPR_GQR0:
case SPR_GQR0 + 1:
case SPR_GQR0 + 2:
case SPR_GQR0 + 3:
case SPR_GQR0 + 4:
case SPR_GQR0 + 5:
case SPR_GQR0 + 6:
case SPR_GQR0 + 7:
// These are safe to do the easy way, see the bottom of this function.
break;
case SPR_XER:
{
ARM64Reg RD = gpr.R(inst.RD);
ARM64Reg WA = gpr.GetReg();
AND(WA, RD, LogicalImm(0xFFFFFF7F, 32));
STRH(IndexType::Unsigned, WA, PPC_REG, PPCSTATE_OFF(xer_stringctrl));
UBFM(WA, RD, XER_CA_SHIFT, XER_CA_SHIFT + 1);
STRB(IndexType::Unsigned, WA, PPC_REG, PPCSTATE_OFF(xer_ca));
UBFM(WA, RD, XER_OV_SHIFT, 31); // Same as WA = RD >> XER_OV_SHIFT
STRB(IndexType::Unsigned, WA, PPC_REG, PPCSTATE_OFF(xer_so_ov));
gpr.Unlock(WA);
}
break;
default:
FALLBACK_IF(true);
}
// OK, this is easy.
ARM64Reg RD = gpr.R(inst.RD);
STR(IndexType::Unsigned, RD, PPC_REG, PPCSTATE_OFF_SPR(iIndex));
}
void JitArm64::crXXX(UGeckoInstruction inst)
{
INSTRUCTION_START
JITDISABLE(bJITSystemRegistersOff);
// Special case: crclr
if (inst.CRBA == inst.CRBB && inst.CRBA == inst.CRBD && inst.SUBOP10 == 193)
{
// Clear CR field bit
int field = inst.CRBD >> 2;
int bit = 3 - (inst.CRBD & 3);
gpr.BindCRToRegister(field, true);
ARM64Reg XA = gpr.CR(field);
switch (bit)
{
case PowerPC::CR_SO_BIT:
AND(XA, XA, LogicalImm(~(u64(1) << PowerPC::CR_EMU_SO_BIT), 64));
break;
case PowerPC::CR_EQ_BIT:
FixGTBeforeSettingCRFieldBit(XA);
ORR(XA, XA, LogicalImm(1, 64));
break;
case PowerPC::CR_GT_BIT:
ORR(XA, XA, LogicalImm(u64(1) << 63, 64));
break;
case PowerPC::CR_LT_BIT:
AND(XA, XA, LogicalImm(~(u64(1) << PowerPC::CR_EMU_LT_BIT), 64));
break;
}
return;
}
// Special case: crset
if (inst.CRBA == inst.CRBB && inst.CRBA == inst.CRBD && inst.SUBOP10 == 289)
{
// SetCRFieldBit
int field = inst.CRBD >> 2;
int bit = 3 - (inst.CRBD & 3);
gpr.BindCRToRegister(field, true);
ARM64Reg XA = gpr.CR(field);
if (bit != PowerPC::CR_GT_BIT)
FixGTBeforeSettingCRFieldBit(XA);
switch (bit)
{
case PowerPC::CR_SO_BIT:
ORR(XA, XA, LogicalImm(u64(1) << PowerPC::CR_EMU_SO_BIT, 64));
break;
case PowerPC::CR_EQ_BIT:
AND(XA, XA, LogicalImm(0xFFFF'FFFF'0000'0000, 64));
break;
case PowerPC::CR_GT_BIT:
AND(XA, XA, LogicalImm(~(u64(1) << 63), 64));
break;
case PowerPC::CR_LT_BIT:
ORR(XA, XA, LogicalImm(u64(1) << PowerPC::CR_EMU_LT_BIT, 64));
break;
}
ORR(XA, XA, LogicalImm(u64(1) << 32, 64));
return;
}
ARM64Reg WA = gpr.GetReg();
ARM64Reg XA = EncodeRegTo64(WA);
ARM64Reg WB = gpr.GetReg();
ARM64Reg XB = EncodeRegTo64(WB);
// creqv or crnand or crnor
bool negateA = inst.SUBOP10 == 289 || inst.SUBOP10 == 225 || inst.SUBOP10 == 33;
// crandc or crorc or crnand or crnor
bool negateB =
inst.SUBOP10 == 129 || inst.SUBOP10 == 417 || inst.SUBOP10 == 225 || inst.SUBOP10 == 33;
// GetCRFieldBit
for (int i = 0; i < 2; i++)
{
int field = i ? inst.CRBB >> 2 : inst.CRBA >> 2;
int bit = i ? 3 - (inst.CRBB & 3) : 3 - (inst.CRBA & 3);
ARM64Reg out = i ? XB : XA;
bool negate = i ? negateB : negateA;
ARM64Reg XC = gpr.CR(field);
ARM64Reg WC = EncodeRegTo32(XC);
switch (bit)
{
case PowerPC::CR_SO_BIT: // check bit 59 set
UBFX(out, XC, PowerPC::CR_EMU_SO_BIT, 1);
if (negate)
EOR(out, out, LogicalImm(1, 64));
break;
case PowerPC::CR_EQ_BIT: // check bits 31-0 == 0
CMP(WC, ARM64Reg::WZR);
CSET(out, negate ? CC_NEQ : CC_EQ);
break;
case PowerPC::CR_GT_BIT: // check val > 0
CMP(XC, ARM64Reg::ZR);
CSET(out, negate ? CC_LE : CC_GT);
break;
case PowerPC::CR_LT_BIT: // check bit 62 set
UBFX(out, XC, PowerPC::CR_EMU_LT_BIT, 1);
if (negate)
EOR(out, out, LogicalImm(1, 64));
break;
default:
ASSERT_MSG(DYNA_REC, false, "Invalid CR bit");
}
}
// Compute combined bit
switch (inst.SUBOP10)
{
case 33: // crnor: ~(A || B) == (~A && ~B)
case 129: // crandc: A && ~B
case 257: // crand: A && B
AND(XA, XA, XB);
break;
case 193: // crxor: A ^ B
case 289: // creqv: ~(A ^ B) = ~A ^ B
EOR(XA, XA, XB);
break;
case 225: // crnand: ~(A && B) == (~A || ~B)
case 417: // crorc: A || ~B
case 449: // cror: A || B
ORR(XA, XA, XB);
break;
}
// Store result bit in CRBD
int field = inst.CRBD >> 2;
int bit = 3 - (inst.CRBD & 3);
gpr.Unlock(WB);
WB = ARM64Reg::INVALID_REG;
gpr.BindCRToRegister(field, true);
XB = gpr.CR(field);
if (bit != PowerPC::CR_GT_BIT)
FixGTBeforeSettingCRFieldBit(XB);
switch (bit)
{
case PowerPC::CR_SO_BIT: // set bit 59 to input
BFI(XB, XA, PowerPC::CR_EMU_SO_BIT, 1);
break;
case PowerPC::CR_EQ_BIT: // clear low 32 bits, set bit 0 to !input
AND(XB, XB, LogicalImm(0xFFFF'FFFF'0000'0000, 64));
EOR(XA, XA, LogicalImm(1, 64));
ORR(XB, XB, XA);
break;
case PowerPC::CR_GT_BIT: // set bit 63 to !input
EOR(XA, XA, LogicalImm(1, 64));
BFI(XB, XA, 63, 1);
break;
case PowerPC::CR_LT_BIT: // set bit 62 to input
BFI(XB, XA, PowerPC::CR_EMU_LT_BIT, 1);
break;
}
ORR(XB, XB, LogicalImm(1ULL << 32, 64));
gpr.Unlock(WA);
}
void JitArm64::mfcr(UGeckoInstruction inst)
{
INSTRUCTION_START
JITDISABLE(bJITSystemRegistersOff);
gpr.BindToRegister(inst.RD, false);
ARM64Reg WA = gpr.R(inst.RD);
ARM64Reg WB = gpr.GetReg();
ARM64Reg WC = gpr.GetReg();
ARM64Reg XA = EncodeRegTo64(WA);
ARM64Reg XC = EncodeRegTo64(WC);
for (int i = 0; i < 8; i++)
{
ARM64Reg CR = gpr.CR(i);
ARM64Reg WCR = EncodeRegTo32(CR);
// SO and LT
static_assert(PowerPC::CR_SO_BIT == 0);
static_assert(PowerPC::CR_LT_BIT == 3);
static_assert(PowerPC::CR_EMU_LT_BIT - PowerPC::CR_EMU_SO_BIT == 3);
UBFX(XC, CR, PowerPC::CR_EMU_SO_BIT, 4);
if (i == 0)
{
MOVI2R(WB, PowerPC::CR_SO | PowerPC::CR_LT);
AND(WA, WC, WB);
}
else
{
AND(WC, WC, WB);
ORR(XA, XC, XA, ArithOption(XA, ShiftType::LSL, 4));
}
// EQ
ORR(WC, WA, LogicalImm(1 << PowerPC::CR_EQ_BIT, 32));
CMP(WCR, ARM64Reg::WZR);
CSEL(WA, WC, WA, CC_EQ);
// GT
ORR(WC, WA, LogicalImm(1 << PowerPC::CR_GT_BIT, 32));
CMP(CR, ARM64Reg::ZR);
CSEL(WA, WC, WA, CC_GT);
}
gpr.Unlock(WB, WC);
}
void JitArm64::mtcrf(UGeckoInstruction inst)
{
INSTRUCTION_START
JITDISABLE(bJITSystemRegistersOff);
u32 crm = inst.CRM;
if (crm != 0)
{
ARM64Reg RS = gpr.R(inst.RS);
ARM64Reg WB = gpr.GetReg();
ARM64Reg XB = EncodeRegTo64(WB);
MOVP2R(XB, PowerPC::ConditionRegister::s_crTable.data());
for (int i = 0; i < 8; ++i)
{
if ((crm & (0x80 >> i)) != 0)
{
gpr.BindCRToRegister(i, false);
ARM64Reg CR = gpr.CR(i);
ARM64Reg WCR = EncodeRegTo32(CR);
if (i != 7)
LSR(WCR, RS, 28 - i * 4);
if (i != 0)
{
if (i != 7)
UBFX(WCR, WCR, 0, 4);
else
UBFX(WCR, RS, 0, 4);
}
LDR(CR, XB, ArithOption(CR, true));
}
}
gpr.Unlock(WB);
}
}
void JitArm64::mcrfs(UGeckoInstruction inst)
{
INSTRUCTION_START
JITDISABLE(bJITSystemRegistersOff);
u8 shift = 4 * (7 - inst.CRFS);
u32 mask = 0xF << shift;
u32 field = inst.CRFD;
// Only clear exception bits (but not FEX/VX).
mask &= FPSCR_FX | FPSCR_ANY_X;
gpr.BindCRToRegister(field, false);
ARM64Reg CR = gpr.CR(field);
ARM64Reg WA = gpr.GetReg();
ARM64Reg WCR = EncodeRegTo32(CR);
ARM64Reg XA = EncodeRegTo64(WA);
LDR(IndexType::Unsigned, WA, PPC_REG, PPCSTATE_OFF(fpscr));
UBFX(WCR, WA, shift, 4);
if (mask != 0)
{
const u32 inverted_mask = ~mask;
AND(WA, WA, LogicalImm(inverted_mask, 32));
UpdateFPExceptionSummary(WA);
STR(IndexType::Unsigned, WA, PPC_REG, PPCSTATE_OFF(fpscr));
}
MOVP2R(XA, PowerPC::ConditionRegister::s_crTable.data());
LDR(CR, XA, ArithOption(CR, true));
gpr.Unlock(WA);
}
void JitArm64::mffsx(UGeckoInstruction inst)
{
INSTRUCTION_START
JITDISABLE(bJITSystemRegistersOff);
FALLBACK_IF(inst.Rc);
ARM64Reg WA = gpr.GetReg();
ARM64Reg XA = EncodeRegTo64(WA);
LDR(IndexType::Unsigned, WA, PPC_REG, PPCSTATE_OFF(fpscr));
ARM64Reg VD = fpr.RW(inst.FD, RegType::LowerPair);
ORR(XA, XA, LogicalImm(0xFFF8'0000'0000'0000, 64));
m_float_emit.FMOV(EncodeRegToDouble(VD), XA);
gpr.Unlock(WA);
}
void JitArm64::mtfsb0x(UGeckoInstruction inst)
{
INSTRUCTION_START
JITDISABLE(bJITSystemRegistersOff);
FALLBACK_IF(inst.Rc);
const u32 mask = 0x80000000 >> inst.CRBD;
const u32 inverted_mask = ~mask;
if (mask == FPSCR_FEX || mask == FPSCR_VX)
return;
ARM64Reg WA = gpr.GetReg();
LDR(IndexType::Unsigned, WA, PPC_REG, PPCSTATE_OFF(fpscr));
AND(WA, WA, LogicalImm(inverted_mask, 32));
if ((mask & (FPSCR_ANY_X | FPSCR_ANY_E)) != 0)
UpdateFPExceptionSummary(WA);
STR(IndexType::Unsigned, WA, PPC_REG, PPCSTATE_OFF(fpscr));
gpr.Unlock(WA);
if (inst.CRBD >= 29)
UpdateRoundingMode();
}
void JitArm64::mtfsb1x(UGeckoInstruction inst)
{
INSTRUCTION_START
JITDISABLE(bJITSystemRegistersOff);
FALLBACK_IF(inst.Rc);
FALLBACK_IF(jo.fp_exceptions);
const u32 mask = 0x80000000 >> inst.CRBD;
if (mask == FPSCR_FEX || mask == FPSCR_VX)
return;
ARM64Reg WA = gpr.GetReg();
LDR(IndexType::Unsigned, WA, PPC_REG, PPCSTATE_OFF(fpscr));
if ((mask & FPSCR_ANY_X) != 0)
{
ARM64Reg WB = gpr.GetReg();
TST(WA, LogicalImm(mask, 32));
ORR(WB, WA, LogicalImm(1 << 31, 32));
CSEL(WA, WA, WB, CCFlags::CC_NEQ);
gpr.Unlock(WB);
}
ORR(WA, WA, LogicalImm(mask, 32));
if ((mask & (FPSCR_ANY_X | FPSCR_ANY_E)) != 0)
UpdateFPExceptionSummary(WA);
STR(IndexType::Unsigned, WA, PPC_REG, PPCSTATE_OFF(fpscr));
gpr.Unlock(WA);
if (inst.CRBD >= 29)
UpdateRoundingMode();
}
void JitArm64::mtfsfix(UGeckoInstruction inst)
{
INSTRUCTION_START
JITDISABLE(bJITSystemRegistersOff);
FALLBACK_IF(inst.Rc);
FALLBACK_IF(jo.fp_exceptions);
u8 imm = (inst.hex >> (31 - 19)) & 0xF;
u8 shift = 28 - 4 * inst.CRFD;
u32 mask = 0xF << shift;
ARM64Reg WA = gpr.GetReg();
LDR(IndexType::Unsigned, WA, PPC_REG, PPCSTATE_OFF(fpscr));
if (imm == 0xF)
{
ORR(WA, WA, LogicalImm(mask, 32));
}
else if (imm == 0x0)
{
BFI(WA, ARM64Reg::WZR, shift, 4);
}
else
{
ARM64Reg WB = gpr.GetReg();
MOVZ(WB, imm);
BFI(WA, WB, shift, 4);
gpr.Unlock(WB);
}
if ((mask & (FPSCR_FEX | FPSCR_VX | FPSCR_ANY_X | FPSCR_ANY_E)) != 0)
UpdateFPExceptionSummary(WA);
STR(IndexType::Unsigned, WA, PPC_REG, PPCSTATE_OFF(fpscr));
gpr.Unlock(WA);
// Field 7 contains NI and RN.
if (inst.CRFD == 7)
UpdateRoundingMode();
}
void JitArm64::mtfsfx(UGeckoInstruction inst)
{
INSTRUCTION_START
JITDISABLE(bJITSystemRegistersOff);
FALLBACK_IF(inst.Rc);
FALLBACK_IF(jo.fp_exceptions);
u32 mask = 0;
for (int i = 0; i < 8; i++)
{
if (inst.FM & (1 << i))
mask |= 0xFU << (4 * i);
}
if (mask == 0xFFFFFFFF)
{
ARM64Reg VB = fpr.R(inst.FB, RegType::LowerPair);
ARM64Reg WA = gpr.GetReg();
m_float_emit.FMOV(WA, EncodeRegToSingle(VB));
UpdateFPExceptionSummary(WA);
STR(IndexType::Unsigned, WA, PPC_REG, PPCSTATE_OFF(fpscr));
gpr.Unlock(WA);
}
else if (mask != 0)
{
ARM64Reg VB = fpr.R(inst.FB, RegType::LowerPair);
ARM64Reg WA = gpr.GetReg();
ARM64Reg WB = gpr.GetReg();
LDR(IndexType::Unsigned, WA, PPC_REG, PPCSTATE_OFF(fpscr));
m_float_emit.FMOV(WB, EncodeRegToSingle(VB));
if (LogicalImm imm = LogicalImm(mask, 32))
{
const u32 inverted_mask = ~mask;
AND(WA, WA, LogicalImm(inverted_mask, 32));
AND(WB, WB, imm);
}
else
{
ARM64Reg WC = gpr.GetReg();
MOVI2R(WC, mask);
BIC(WA, WA, WC);
AND(WB, WB, WC);
gpr.Unlock(WC);
}
ORR(WA, WA, WB);
gpr.Unlock(WB);
if ((mask & (FPSCR_FEX | FPSCR_VX | FPSCR_ANY_X | FPSCR_ANY_E)) != 0)
UpdateFPExceptionSummary(WA);
STR(IndexType::Unsigned, WA, PPC_REG, PPCSTATE_OFF(fpscr));
gpr.Unlock(WA);
}
if (inst.FM & 1)
UpdateRoundingMode();
}