search for: ppcdoubledoubl

I have found some internal test failures due to the wrong constant folding on ppc_fp128. As documented in APFloat::PPCDoubleDouble, APFloat doesn't support PowerPC double-double correctly < https://github.com/llvm-mirror/llvm/blob/492acdd450bcdf9837494d6da029ed064f14fc33/lib/Support/APFloat.cpp#L74 >. To support this, we need to add a second tuple of (sign, exponent, significand) to APFloat. I wonder where should I...

...e-precision arithmetic on the elements of the > pairs. As a result, I suspect we really just want to store the two > double-precision numbers, and essentially delegate to APFloat IEEEdouble in > the implementation of the various operations. > > As such, one option might be that, when PPCDoubleDouble fltSemantics are > selected, the exponent and sign are ignored, and we just store the data for > the two double-precision floating-point numbers in the significand. We > might even do this directly, by making the significand something like this: > > union Significand { > in...

Hi all, What changes to LLVM are needed to support arithmetic for PPCDoubleDouble? arithmeticOK == false for PPCDoubleDouble leads e.g. to assert "Compile-time arithmetic does not support these semantics" when compiling the next function on PowerPC with clang: double quiet_NaN() { return 4.94065645841246544176568792868221e-324L; } -- Regards, Konstantin