Add ss/sd suffix to InstX8632Store and legalize FP constants.

src/IceTargetLoweringX8632.cpp

 //===- subzero/src/IceTargetLoweringX8632.cpp - x86-32 lowering -----------===//
 //
 //                        The Subzero Code Generator
 //
 // This file is distributed under the University of Illinois Open Source
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
 //
 // This file implements the TargetLoweringX8632 class, which
@@ skipping 2156 matching lines @@
       //
       // If in the future the implementation is changed to lower undef
       // values to uninitialized registers, a FakeDef will be needed:
       //     Context.insert(InstFakeDef::create(Func, Reg));
       // This is in order to ensure that the live range of Reg is not
       // overestimated.  If the constant being lowered is a 64 bit value,
       // then the result should be split and the lo and hi components will
       // need to go in uninitialized registers.
       From = Ctx->getConstantZero(From->getType());
     }
-    if (!(Allowed & Legal_Imm)) {
+    bool NeedsReg = !(Allowed & Legal_Imm) ||
+        // ConstantFloat and ConstantDouble are actually memory operands.
+        (!(Allowed & Legal_Mem) && (From->getType() == IceType_f32 ||
+                                    From->getType() == IceType_f64));
+    if (NeedsReg) {
       Variable *Reg = makeReg(From->getType(), RegNum);
       _mov(Reg, From);
       From = Reg;
     }
     return From;
   }
   if (Variable *Var = llvm::dyn_cast<Variable>(From)) {
     // We need a new physical register for the operand if:
     //   Mem is not allowed and Var->getRegNum() is unknown, or
     //   RegNum is required and Var->getRegNum() doesn't match.
@@ skipping 95 matching lines @@
   // llvm-mc doesn't parse "dword ptr [.L$foo]".
   Str << "dword ptr [L$" << IceType_f32 << "$" << getPoolEntryID() << "]";
 }
 
 template <> void ConstantDouble::emit(GlobalContext *Ctx) const {
   Ostream &Str = Ctx->getStrEmit();
   Str << "qword ptr [L$" << IceType_f64 << "$" << getPoolEntryID() << "]";
 }
 
 } // end of namespace Ice