Add missing FP build attribute tests.

The test file test/CodeGen/ARM/build-attributes.ll was missing several
floating-point build attribute tests. The intention of this commit is that for
each CPU / architecture currently tested, there are now tests that make sure
the following attributes are sufficiently checked,

  * Tag_ABI_FP_rounding
  * Tag_ABI_FP_denormal
  * Tag_ABI_FP_exceptions
  * Tag_ABI_FP_user_exceptions
  * Tag_ABI_FP_number_model

Also in this commit, the -unsafe-fp-math flag has been augmented with the full
suite of flags Clang sends to LLVM when you pass -ffast-math to Clang. That is,
`-unsafe-fp-math' has been changed to `-enable-unsafe-fp-math -disable-fp-elim
-enable-no-infs-fp-math -enable-no-nans-fp-math -fp-contract=fast'

Change-Id: I35d766076bcbbf09021021c0a534bf8bf9a32dfc
llvm-svn: 223454

1 files changed, 2 insertions, 0 deletions

diff --git a/llvm/lib/Target/ARM/ARMAsmPrinter.cpp b/llvm/lib/Target/ARM/ARMAsmPrinter.cpp
index 99e65037260..90f16f58afc 100644
--- a/llvm/lib/Target/ARM/ARMAsmPrinter.cpp
+++ b/llvm/lib/Target/ARM/ARMAsmPrinter.cpp
@@ -747,6 +747,8 @@ void ARMAsmPrinter::emitAttributes() {
     // absence of its emission implies zero).
   }
 
+  // TM.Options.NoInfsFPMath && TM.Options.NoNaNsFPMath is the
+  // equivalent of GCC's -ffinite-math-only flag.
   if (TM.Options.NoInfsFPMath && TM.Options.NoNaNsFPMath)
     ATS.emitAttribute(ARMBuildAttrs::ABI_FP_number_model,
                       ARMBuildAttrs::Allowed);