rsmith added inline comments.
================
Comment at: lib/CodeGen/ItaniumCXXABI.cpp:3878
+ } else {
+ // FIXME: We could filter out definitely-unreachable catch handlers.
+ EHCatchScope *LaterCatchScope =
----------------
There are a lot of other optimizations possible here. For example: if there are
no later catches, and no enclosing EH scopes, we can just `resume` (before the
`__cxa_begin_catch`) call. Or if the first such later catch will definitely
catch the exception (eg, `catch (int*&) {} catch (int*) {}`), we could branch
directly to it.
I'm inclined to think we should keep the frontend emission simpler and
implement these cases as EHABI-aware middle-end optimization passes if we care
enough about them.
Repository:
rC Clang
https://reviews.llvm.org/D42092
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