[mips][mips64r6] Add experimental support for MIPS32r6 and MIPS64r6

Summary:
Adds MIPS32r6/MIPS64r6 and checks the compatibility requirements for these
processors.

I've also included comments to describe removed and re-encoded instructions,
along with placeholder def's for the new instructions but there are no
functional changes to codegen at this point.

Reviewers: jkolek, vmedic

Reviewed By: vmedic

Differential Revision: http://reviews.llvm.org/D3622

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@208399 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 9 insertions, 0 deletions

diff --git a/lib/Target/Mips/MipsSubtarget.cpp b/lib/Target/Mips/MipsSubtarget.cpp
index 6675ad42aa..7fc8d63ae4 100644
--- a/lib/Target/Mips/MipsSubtarget.cpp
+++ b/lib/Target/Mips/MipsSubtarget.cpp
@@ -137,6 +137,15 @@ MipsSubtarget::MipsSubtarget(const std::string &TT, const std::string &CPU,
                        "See -mattr=+fp64.",
                        false);
 
+  if (hasMips32r6()) {
+    StringRef ISA = hasMips64r6() ? "MIPS64r6" : "MIPS32r6";
+
+    assert(isFP64bit());
+    assert(isNaN2008());
+    if (hasDSP())
+      report_fatal_error(ISA + " is not compatible with the DSP ASE", false);
+  }
+
   // Is the target system Linux ?
   if (TT.find("linux") == std::string::npos)
     IsLinux = false;