Fix `compiler_rt_logbf_test.c` test failure for Builtins-i386-darwin test suite.

It seems that compiler-rt's implementation and Darwin
libm's implementation of `logbf()` differ when given a NaN
with raised sign bit. Strangely this behaviour only happens with
i386 Darwin libm. For x86_64 and x86_64h the existing compiler-rt
implementation matched Darwin libm.

To workaround this the `compiler_rt_logbf_test.c` has been modified
to do a comparison on the `fp_t` type and if that fails check if both
values are NaN. If both values are NaN they are equivalent and no
error needs to be raised.


Reviewers: rupprecht, scanon, compnerd, echristo
Subscribers: #sanitizers, llvm-commits
Tags: #llvm, #sanitizers
Differential Revision:

git-svn-id: 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed