[clang][mips] Set __mips_fpr correctly for -mfpxx

Set __mips_fpr to 0 if o32 ABI is used with either -mfpxx
or none of -mfp32, -mfpxx, -mfp64 being specified.

Introduce additional checks:
-mfpxx is only to be used in conjunction with the o32 ABI.
report an error when incompatible options are provided.

Formerly no errors were raised when combining n32/n64 ABIs
with -mfp32 and -mfpxx.

There are other cases when __mips_fpr should be set to 0
that are not covered, ex. using o32 on a mips64 cpu
which is valid but not supported in the backend as of yet.

Differential Revision: https://reviews.llvm.org/D50557


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@340391 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 3 insertions, 0 deletions

diff --git a/include/clang/Basic/DiagnosticCommonKinds.td b/include/clang/Basic/DiagnosticCommonKinds.td
index b98b183c9d..c3e2aa8b5c 100644
--- a/include/clang/Basic/DiagnosticCommonKinds.td
+++ b/include/clang/Basic/DiagnosticCommonKinds.td
@@ -199,6 +199,9 @@ def err_target_unknown_abi : Error<"unknown target ABI '%0'">;
 def err_target_unsupported_abi : Error<"ABI '%0' is not supported on CPU '%1'">;
 def err_target_unsupported_abi_for_triple : Error<
   "ABI '%0' is not supported for '%1'">;
+def err_unsupported_abi_for_opt : Error<"'%0' can only be used with the '%1' ABI">;
+def err_mips_fp64_req : Error<
+    "'%0' can only be used if the target supports the mfhc1 and mthc1 instructions">;
 def err_target_unknown_fpmath : Error<"unknown FP unit '%0'">;
 def err_target_unsupported_fpmath : Error<
     "the '%0' unit is not supported with this instruction set">;