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

[Fangrui Song via Phabricator via cfe-commits]

MaskRay added a comment.

`-mlong-double-128` is not supported now. The mangling scheme of `-mlong-double-64` is consistent with gcc on x86 and ppc.

  % g++ a.cc -S -o - | grep '^_Z3foo'
  _Z3fooe:
  % g++ a.cc -S -o - -mlong-double-64 | grep '^_Z3foo'
  _Z3fooe:
  % g++ a.cc -S -o - -mlong-double-128 | grep '^_Z3foo'
  _Z3foog:
  
  % powerpc64le-linux-gnu-g++ a.cc -S -o - -mlong-double-64 | grep '^_Z3foo'
  _Z3fooe:
  % powerpc64le-linux-gnu-g++ a.cc -S -o - -mlong-double-128 -mabi=ibmlongdouble | grep '^_Z3foo'
  _Z3foog:
  % powerpc64le-linux-gnu-g++ a.cc -S -o - -mlong-double-128 -mabi=ieeelongdouble | grep '^_Z3foo'
  _Z3fooU10__float128:


Repository:
  rC Clang

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  https://reviews.llvm.org/D64067/new/

https://reviews.llvm.org/D64067