[clang] [clang][PowerPC] Enable IEEE-128 long double on FreeBSD/powerpc64le (PR #201298)

[Adrian Chadd via cfe-commits]

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@@ -234,7 +232,10 @@ llvm::Constant *CodeGenModule::getBuiltinLibFunction(const FunctionDecl *FD,
   else {
     // TODO: This mutation should also be applied to other targets other than
     // PPC, after backend supports IEEE 128-bit style libcalls.
-    if (getTriple().isPPC64() &&
+    // FreeBSD's powerpc64le has a single IEEE-128 long double format and uses
+    // the unsuffixed libm names, so skip the IEEE-128 libcall redirection
+    // there; other PPC64 IEEE-128 targets keep it.
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erikarn wrote:

Just out of curiousity (and I'm one of the people pkubaj asked) - is this math api/abi thing in question just for ppc64 or does it apply to math function naming on other architectures?

This diff is in the freebsd tree now and we're using it (and finding all the fun bugs in software - including other compilers/toolchains! - now that the type has changed. It'd be nice to land this if he's addressed all the issues and have the renaming discussion in a separate email/thread.

https://github.com/llvm/llvm-project/pull/201298