[PATCH] D64067: [X86][PPC] Support -mlong-double-64

Wed Jul 3 11:19:08 PDT 2019

rnk added a comment.

In D64067#1568533 <https://reviews.llvm.org/D64067#1568533>, @andrew.w.kaylor wrote:

> In this review (https://reviews.llvm.org/D6260) @rsmith mentions that this should also have an effect on name mangling.

I'm not sure that's consistent with GCC, at least not anymore:
https://gcc.godbolt.org/z/eUviCd
Looks like you can still have an overload set with double and long double, even if they both use the same representation. This is a backend -m flag, after all, so that seems reasonable to me.

> What will this do if the user calls a library function that expects a long double? What does gcc do in that case?

Looks like it passes according to the usual 64-bit IEEE double representation.

Repository:
  rC Clang

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https://reviews.llvm.org/D64067