rjmccall added inline comments.

================
Comment at: clang/include/clang/AST/ASTContext.h:1095
   CanQualType FloatComplexTy, DoubleComplexTy, LongDoubleComplexTy;
-  CanQualType Float128ComplexTy;
+  CanQualType Float128ComplexTy, Ibm128ComplexTy;
   CanQualType VoidPtrTy, NullPtrTy;
----------------
Huh.  I don't know why we precompute these.  I mean, it's not a huge start-up 
overhead for the compiler, but it's not nothing, and the use in 
`getFloatingTypeOfSizeWithinDomain` is not at all worth optimizing.

Would you mind writing up a patch that rips all of these out and makes the 
use-sites just build the appropriate complex type as needed?  And then we can 
land a patch for this that just does the one-liner to allow `_Complex __ibm128`.


================
Comment at: clang/lib/Sema/Sema.cpp:1898
+          (&Sem == &llvm::APFloat::PPCDoubleDouble() &&
+           !Context.getTargetInfo().hasIbm128Type()))
         LongDoubleMismatched = true;
----------------
Why is this change in this patch?


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D109948/new/

https://reviews.llvm.org/D109948

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