[cfe-dev] Disabling emitting x86_fp80/ppc_fp128 IR

[Rob Lyerly via cfe-dev]

Hi all,

According to this thread (http://www.openwall.com/lists/musl/2016/03/11/18),
clang does not support emitting architecture-independent "fp128" types for
PowerPC & x86-64, but instead will only emit their architecture-specific
long double types.  One alternative the thread suggests is to to force GCC
to demote long double types to be equivalent to normal 64-bit doubles.  Is
there a way to enforce this behavior using clang, i.e., force clang to emit
IR "double" types for values declared as "long double" in the source code?

On Thu, Aug 3, 2017 at 11:09 AM, Rob Lyerly <rlyerly at vt.edu> wrote:

> Hi all,
>
> I'm sure this has been answered somewhere but I can't seem to find it.
> I've got an application that uses the long double type in a couple of
> places.  Is there a way to prevent clang from emitting
> architecture-specific floating point types, i.e., "x86_fp80" & "ppc_fp128",
> and instead force clang to only emit "fp128" types?  It seems like LLVM's
> backends can easily handle this by emitting soft floating point routines
> (defined in the "compiler-rt" project) for dealing with these types.
> However, I don't want to force soft floating point routines for other
> types, i.e., "half", "float" and "double".
>
> Thanks!
>
> --
> Rob Lyerly
> Graduate Research Assistant, Systems Software Research Group
>
>
>



-- 
Rob Lyerly
Graduate Research Assistant, Systems Software Research Group
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