[Subzero][MIPS32] Add argument handling in LowerCall

src/IceRegistersMIPS32.h

 //===- subzero/src/IceRegistersMIPS32.h - Register information --*- C++ -*-===//
 //
 //                        The Subzero Code Generator
 //
 // This file is distributed under the University of Illinois Open Source
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
 ///
 /// \file
@@ skipping 71 matching lines @@
   return FPRRegister(RegNum - Reg_FPR_First);
 }
 
 static inline bool isFPRReg(RegNumT RegNum) {
   return (int(Reg_FPR_First) <= int(RegNum)) &&
          (unsigned(RegNum) <= Reg_FPR_Last);
 }
 
 const char *getRegName(RegNumT RegNum);
 
+static inline RegNumT getI64PairFirstGPRNum(RegNumT RegNum) {
+  RegNum.assertIsValid();
+  return (RegNum == RegNumT::fixme(RegMIPS32::Reg_A0A1)) ? RegMIPS32::Reg_A0 : RegMIPS32::Reg_A2;

[Jim Stichnoth, 2016/05/31 16:37:45]

This seems fine as long as RegNum is A0A1 or A2A3, but not for V0V1, T0T1, T2T3,
etc.  Same comment below.

+}
+
+static inline RegNumT getI64PairSecondGPRNum(RegNumT RegNum) {
+  RegNum.assertIsValid();
+  return (RegNum == RegNumT::fixme(RegMIPS32::Reg_A0A1)) ? RegMIPS32::Reg_A1 : RegMIPS32::Reg_A3;

[Jim Stichnoth, 2016/05/31 16:37:45]

80-col
(run "make -f Makefile.standalone format" to fix automatically)

+}
+
 } // end of namespace RegMIPS32
 
 // Extend enum RegClass with MIPS32-specific register classes (if any).
 enum RegClassMIPS32 : uint8_t { RCMIPS32_NUM = RC_Target };
 
 } // end of namespace MIPS32
 } // end of namespace Ice
 
 #endif // SUBZERO_SRC_ICEREGISTERSMIPS32_H