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 ‘’.
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?