| commit | 325034952f304fcc408ab4787597aa97f12bd975 | [log] [tgz] |
|---|---|---|
| author | Sergei Barannikov <barannikov88@gmail.com> | Sat Sep 06 11:07:42 2025 +0300 |
| committer | GitHub <noreply@github.com> | Sat Sep 06 11:07:42 2025 +0300 |
| tree | 2ccbf56b2b51879d298c5578f7776de5ab0a1d66 | |
| parent | 188586a246ad1f6fe3ad021a12a952b50f7036ba [diff] |
[TableGen][DecoderEmitter] Add OPC_Scope opcode (#155580) This change introduces OPC_Scope opcode, whose only purpose is to record a continuation point to resume at if a subsequent opcode fails. Each OPC_Scope pushes an entry onto the scope stack; an entry is popped if an opcode in the scope fails. Previously, we recorded this information on several opcodes, it has been removed. A series of such opcodes often referred to the same continuation point; this information is now recorded in one place, reducing table sizes in most cases. Average reduction is 1.1%, some table observe up to 7% reduction in size. The new behavior of those opcodes is "check or leave scope". If we're in the outermost scope (scope stack is empty), they act as "check or fail". There is one opcode, OPC_FilterValueOrSkip that behaves like the old OPC_FilterValue. It is special because it acts as a case of a switch statement and has nothing to do with scopes. (If a case fails, we should try the next case instead of leaving the current scope.)
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