[PATCH] D123952: [FPEnv] Allow CompoundStmt to keep FP options

[Serge Pavlov via Phabricator via cfe-commits]

sepavloff added inline comments.


================
Comment at: clang/lib/Sema/SemaStmt.cpp:452
+                      : getCurCompoundScope().FPFeatures;
+  FPOptionsOverride FPDiff = getCurFPFeatures().diffWith(FPO);
+
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rjmccall wrote:
> How cheap is this?  Is this something it would be worthwhile to fast-path by maintaining a bit to check for the rare case where we have an override in a scope?
Added an optimization to `diffWith`: detect the frequent case, when FPOptions is not changed, and implement fast-path for it.


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D123952/new/

https://reviews.llvm.org/D123952