Change how FP immediates are handled.

1) ConstantFP is now expand by default
2) ConstantFP is not turned into TargetConstantFP during Legalize
   if it is legal.

This allows ConstantFP to be handled like Constant, allowing for 
targets that can encode FP immediates as MachineOperands.

As a bonus, fix up Itanium FP constants, which now correctly match,
and match more constants!  Hooray.

llvm-svn: 47121

1 files changed, 5 insertions, 0 deletions

diff --git a/llvm/lib/CodeGen/SelectionDAG/ScheduleDAG.cpp b/llvm/lib/CodeGen/SelectionDAG/ScheduleDAG.cpp
index 44886e76df8..e7980156905 100644
--- a/llvm/lib/CodeGen/SelectionDAG/ScheduleDAG.cpp
+++ b/llvm/lib/CodeGen/SelectionDAG/ScheduleDAG.cpp
@@ -14,6 +14,7 @@
 //===----------------------------------------------------------------------===//
 
 #define DEBUG_TYPE "pre-RA-sched"
+#include "llvm/Constants.h"
 #include "llvm/Type.h"
 #include "llvm/CodeGen/ScheduleDAG.h"
 #include "llvm/CodeGen/MachineConstantPool.h"
@@ -478,6 +479,10 @@ void ScheduleDAG::AddOperand(MachineInstr *MI, SDOperand Op,
     }
   } else if (ConstantSDNode *C = dyn_cast<ConstantSDNode>(Op)) {
     MI->addOperand(MachineOperand::CreateImm(C->getValue()));
+  } else if (ConstantFPSDNode *F = dyn_cast<ConstantFPSDNode>(Op)) {
+    const Type *FType = MVT::getTypeForValueType(Op.getValueType());
+    ConstantFP *CFP = ConstantFP::get(FType, F->getValueAPF());
+    MI->addOperand(MachineOperand::CreateFPImm(CFP));
   } else if (RegisterSDNode *R = dyn_cast<RegisterSDNode>(Op)) {
     MI->addOperand(MachineOperand::CreateReg(R->getReg(), false));
   } else if (GlobalAddressSDNode *TGA = dyn_cast<GlobalAddressSDNode>(Op)) {