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JitArm64: Use STP for pc/npc

This commit is contained in:
JosJuice 2021-01-30 11:56:25 +01:00
parent b22073ef59
commit dd8e504c80
2 changed files with 14 additions and 7 deletions
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14
Source/Core/Core/PowerPC/JitArm64/Jit.cpp
View File

@ -452,13 +452,16 @@ void JitArm64::WriteExceptionExit(u32 destination, bool only_external)
MOVI2R(DISPATCHER_PC, destination);
FixupBranch no_exceptions = CBZ(W30);
STR(IndexType::Unsigned, DISPATCHER_PC, PPC_REG, PPCSTATE_OFF(pc));
STR(IndexType::Unsigned, DISPATCHER_PC, PPC_REG, PPCSTATE_OFF(npc));
static_assert(PPCSTATE_OFF(pc) <= 252);
static_assert(PPCSTATE_OFF(pc) + 4 == PPCSTATE_OFF(npc));
STP(IndexType::Signed, DISPATCHER_PC, DISPATCHER_PC, PPC_REG, PPCSTATE_OFF(pc));
if (only_external)
MOVP2R(X8, &PowerPC::CheckExternalExceptions);
else
MOVP2R(X8, &PowerPC::CheckExceptions);
BLR(X8);
LDR(IndexType::Unsigned, DISPATCHER_PC, PPC_REG, PPCSTATE_OFF(npc));
SetJumpTarget(no_exceptions);
@ -479,13 +482,16 @@ void JitArm64::WriteExceptionExit(ARM64Reg dest, bool only_external)
LDR(IndexType::Unsigned, W30, PPC_REG, PPCSTATE_OFF(Exceptions));
FixupBranch no_exceptions = CBZ(W30);
STR(IndexType::Unsigned, DISPATCHER_PC, PPC_REG, PPCSTATE_OFF(pc));
STR(IndexType::Unsigned, DISPATCHER_PC, PPC_REG, PPCSTATE_OFF(npc));
static_assert(PPCSTATE_OFF(pc) <= 252);
static_assert(PPCSTATE_OFF(pc) + 4 == PPCSTATE_OFF(npc));
STP(IndexType::Signed, DISPATCHER_PC, DISPATCHER_PC, PPC_REG, PPCSTATE_OFF(pc));
if (only_external)
MOVP2R(EncodeRegTo64(DISPATCHER_PC), &PowerPC::CheckExternalExceptions);
else
MOVP2R(EncodeRegTo64(DISPATCHER_PC), &PowerPC::CheckExceptions);
BLR(EncodeRegTo64(DISPATCHER_PC));
LDR(IndexType::Unsigned, DISPATCHER_PC, PPC_REG, PPCSTATE_OFF(npc));
SetJumpTarget(no_exceptions);

7
Source/Core/Core/PowerPC/PowerPC.h
View File

@ -102,12 +102,16 @@ static_assert(std::is_standard_layout<PairedSingle>(), "PairedSingle must be sta
//
// On AArch64, most load/store instructions support fairly large immediate offsets,
// but not LDP/STP, which we want to use for accessing certain things.
// These must be in the first 260 bytes: pc, npc
// These must be in the first 520 bytes: gather_pipe_ptr, gather_pipe_base_ptr
// Better code is generated if these are in the first 260 bytes: gpr
// Better code is generated if these are in the first 520 bytes: ps
// Unfortunately not all of those fit in 520 bytes, but we can fit most of ps and all of the rest.
struct PowerPCState
{
u32 pc; // program counter
u32 npc;
// gather pipe pointer for JIT access
u8* gather_pipe_ptr;
u8* gather_pipe_base_ptr;
@ -121,9 +125,6 @@ struct PowerPCState
alignas(16) PairedSingle ps[32];
#endif
u32 pc; // program counter
u32 npc;
ConditionRegister cr;
UReg_MSR msr; // machine state register