[llvm-dev] '__builtin_nanl' and soft-FP64 support

Martin J. O'Riordan via llvm-dev llvm-dev at lists.llvm.org
Mon Sep 25 05:35:52 PDT 2017

I am seeing failures in two tests after migrating to v5.0 final, these are:




However, these are new tests and it turns out that the underlying problem is
that the builtin '__builtin_nanl("")' is returning the value
0x0000000000000000.  I tested this builtin with our v4.0 compiler and it has
the same problem, so this is not a regression but rather an existing bug
exposed by the new LibC++ implementation of '<limits>'.


But our implementation of FP64 is a software only implementation using the
FP64 support functions in 'compiler-rt' and we have no lowering actions of
our own.


Where should I be looking to find out how to fix this?  Is it a CLang issue
of an LLVM issue?






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