MaskRay added a comment.
Drive-by comment :)
In gcc, (1) -mlong-double-128 uses IEEE 754 quad as the representation of long
double on x86_64 (2) -mlong-double-128 -mabi=ieeelongdouble uses IEEE 754 quad
as the representation of long double on powerpc{32,64}. (On Linux
powerpc{32,64}, `-mlong-double-128 -mabi=ibmlongdouble` is the default, it uses
a IBM 128-bit extended precision for long double).
`-mlong-double-128` is currently not supported by clang, but I intend to
support it in D64277 <https://reviews.llvm.org/D64277>. After that, the
representation of `long double` will be the same as `__float128` (unfortunately
they will use the same mangling scheme)
As I noticed, the mangling scheme of `__float128` also needs a fix. After
applying D64277 <https://reviews.llvm.org/D64277> and its dependent revisions,
the last two CHECK lines of test/OpenMP/nvptx_unsupported_type_codegen.cpp will
fail...
Repository:
rG LLVM Github Monorepo
CHANGES SINCE LAST ACTION
https://reviews.llvm.org/D64289/new/
https://reviews.llvm.org/D64289
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