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ir/terminal: Add FastDispatchHint

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This commit is contained in:
MerryMage 2018-09-07 21:29:47 +01:00
parent 1a69a61cb4
commit aa8d826c13
6 changed files with 20 additions and 11 deletions
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10
src/backend/x64/a32_emit_x64.cpp
View file

@ -1230,14 +1230,8 @@ void A32EmitX64::EmitTerminalImpl(IR::Term::PopRSBHint, IR::LocationDescriptor)
code.or_(ebx, dword[r15 + offsetof(A32JitState, CPSR_et)]);
code.or_(rbx, rcx);
code.mov(eax, dword[r15 + offsetof(A32JitState, rsb_ptr)]);
code.sub(eax, 1);
code.and_(eax, u32(A32JitState::RSBPtrMask));
code.mov(dword[r15 + offsetof(A32JitState, rsb_ptr)], eax);
code.cmp(rbx, qword[r15 + offsetof(A32JitState, rsb_location_descriptors) + rax * sizeof(u64)]);
code.jne(code.GetReturnFromRunCodeAddress());
code.mov(rax, qword[r15 + offsetof(A32JitState, rsb_codeptrs) + rax * sizeof(u64)]);
code.jmp(rax);
void A32EmitX64::EmitTerminalImpl(IR::Term::FastDispatchHint, IR::LocationDescriptor initial_location) {
EmitTerminalImpl(IR::Term::ReturnToDispatch{}, initial_location);
}
void A32EmitX64::EmitTerminalImpl(IR::Term::If terminal, IR::LocationDescriptor initial_location) {

1
src/backend/x64/a32_emit_x64.h
View file

@ -77,6 +77,7 @@ protected:
void EmitTerminalImpl(IR::Term::LinkBlock terminal, IR::LocationDescriptor initial_location) override;
void EmitTerminalImpl(IR::Term::LinkBlockFast terminal, IR::LocationDescriptor initial_location) override;
void EmitTerminalImpl(IR::Term::PopRSBHint terminal, IR::LocationDescriptor initial_location) override;
void EmitTerminalImpl(IR::Term::FastDispatchHint terminal, IR::LocationDescriptor initial_location) override;
void EmitTerminalImpl(IR::Term::If terminal, IR::LocationDescriptor initial_location) override;
void EmitTerminalImpl(IR::Term::CheckBit terminal, IR::LocationDescriptor initial_location) override;
void EmitTerminalImpl(IR::Term::CheckHalt terminal, IR::LocationDescriptor initial_location) override;

4
src/backend/x64/a64_emit_x64.cpp
View file

@ -1070,6 +1070,10 @@ void A64EmitX64::EmitTerminalImpl(IR::Term::PopRSBHint, IR::LocationDescriptor)
code.jmp(rax);
}
void A64EmitX64::EmitTerminalImpl(IR::Term::FastDispatchHint, IR::LocationDescriptor initial_location) {
EmitTerminalImpl(IR::Term::ReturnToDispatch{}, initial_location);
}
void A64EmitX64::EmitTerminalImpl(IR::Term::If terminal, IR::LocationDescriptor initial_location) {
switch (terminal.if_) {
case IR::Cond::AL:

1
src/backend/x64/a64_emit_x64.h
View file

@ -83,6 +83,7 @@ protected:
void EmitTerminalImpl(IR::Term::LinkBlock terminal, IR::LocationDescriptor initial_location) override;
void EmitTerminalImpl(IR::Term::LinkBlockFast terminal, IR::LocationDescriptor initial_location) override;
void EmitTerminalImpl(IR::Term::PopRSBHint terminal, IR::LocationDescriptor initial_location) override;
void EmitTerminalImpl(IR::Term::FastDispatchHint terminal, IR::LocationDescriptor initial_location) override;
void EmitTerminalImpl(IR::Term::If terminal, IR::LocationDescriptor initial_location) override;
void EmitTerminalImpl(IR::Term::CheckBit terminal, IR::LocationDescriptor initial_location) override;
void EmitTerminalImpl(IR::Term::CheckHalt terminal, IR::LocationDescriptor initial_location) override;

1
src/backend/x64/emit_x64.h
View file

@ -100,6 +100,7 @@ protected:
virtual void EmitTerminalImpl(IR::Term::LinkBlock terminal, IR::LocationDescriptor initial_location) = 0;
virtual void EmitTerminalImpl(IR::Term::LinkBlockFast terminal, IR::LocationDescriptor initial_location) = 0;
virtual void EmitTerminalImpl(IR::Term::PopRSBHint terminal, IR::LocationDescriptor initial_location) = 0;
virtual void EmitTerminalImpl(IR::Term::FastDispatchHint terminal, IR::LocationDescriptor initial_location) = 0;
virtual void EmitTerminalImpl(IR::Term::If terminal, IR::LocationDescriptor initial_location) = 0;
virtual void EmitTerminalImpl(IR::Term::CheckBit terminal, IR::LocationDescriptor initial_location) = 0;
virtual void EmitTerminalImpl(IR::Term::CheckHalt terminal, IR::LocationDescriptor initial_location) = 0;

14
src/frontend/ir/terminal.h
View file

@ -29,7 +29,7 @@ struct Interpret {
/**
* This terminal instruction returns control to the dispatcher.
* The dispatcher will use the value in R15 to determine what comes next.
* The dispatcher will use the current cpu state to determine what comes next.
*/
struct ReturnToDispatch {};
@ -57,14 +57,21 @@ struct LinkBlockFast {
};
/**
* This terminal instruction checks the top of the Return Stack Buffer against R15.
* If RSB lookup fails, control is returned to the dispatcher.
* This terminal instruction checks the top of the Return Stack Buffer against the current
* location descriptor. If RSB lookup fails, control is returned to the dispatcher.
* This is an optimization for faster function calls. A backend that doesn't support
* this optimization or doesn't have a RSB may choose to implement this exactly as
* ReturnToDispatch.
*/
struct PopRSBHint {};
/**
* This terminal instruction performs a lookup of the current location descriptor in the
* fast dispatch lookup table. A backend that doesn't support this optimization may choose
* to implement this exactly as ReturnToDispatch.
*/
struct FastDispatchHint {};
struct If;
struct CheckBit;
struct CheckHalt;
@ -76,6 +83,7 @@ using Terminal = boost::variant<
LinkBlock,
LinkBlockFast,
PopRSBHint,
FastDispatchHint,
boost::recursive_wrapper<If>,
boost::recursive_wrapper<CheckBit>,
boost::recursive_wrapper<CheckHalt>