Start pushing changes for Mips Fast-Isel

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@206505 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 14 insertions, 0 deletions

diff --git a/lib/Target/Mips/MipsISelLowering.cpp b/lib/Target/Mips/MipsISelLowering.cpp
index e7120edb84..7ca7876040 100644
--- a/lib/Target/Mips/MipsISelLowering.cpp
+++ b/lib/Target/Mips/MipsISelLowering.cpp
@@ -50,6 +50,11 @@ NoZeroDivCheck("mno-check-zero-division", cl::Hidden,
                cl::desc("MIPS: Don't trap on integer division by zero."),
                cl::init(false));
 
+cl::opt<bool>
+EnableMipsFastISel("mips-fast-isel", cl::Hidden,
+  cl::desc("Allow mips-fast-isel to be used"),
+  cl::init(false));
+
 static const MCPhysReg O32IntRegs[4] = {
   Mips::A0, Mips::A1, Mips::A2, Mips::A3
 };
@@ -396,6 +401,15 @@ const MipsTargetLowering *MipsTargetLowering::create(MipsTargetMachine &TM) {
   return llvm::createMipsSETargetLowering(TM);
 }
 
+// Create a fast isel object.
+FastISel *
+MipsTargetLowering::createFastISel(FunctionLoweringInfo &funcInfo,
+                                  const TargetLibraryInfo *libInfo) const {
+  if (!EnableMipsFastISel)
+    return TargetLowering::createFastISel(funcInfo, libInfo);
+  return Mips::createFastISel(funcInfo, libInfo);
+}
+
 EVT MipsTargetLowering::getSetCCResultType(LLVMContext &, EVT VT) const {
   if (!VT.isVector())
     return MVT::i32;