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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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14
src/frontend/ir/terminal.h
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@ -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>