Calling convention for MIPS32

src/IceRegistersMIPS32.h

Index: src/IceRegistersMIPS32.h
diff --git a/src/IceRegistersMIPS32.h b/src/IceRegistersMIPS32.h
index f6ea38e312b5b65537cbc20c7acff76456ddf1b7..bd1acac0cd3fa9e783ca9bcb02f006958441ea1a 100644
--- a/src/IceRegistersMIPS32.h
+++ b/src/IceRegistersMIPS32.h
@@ -89,6 +89,24 @@ static inline bool isFPRReg(RegNumT RegNum) {
 
 const char *getRegName(RegNumT RegNum);
 
+static inline RegNumT getI64PairFirstGPRNum(RegNumT RegNum) {
+  // CAUTION: This is not entirely correct, as it will return Reg_A2 even when

[Jim Stichnoth, 2016/06/09 21:27:23]

I think the caution should be stronger, such as something like
   assert(RegNum == Reg_A0A1 || RegNum == Reg_A2A3);
Otherwise you are just asking for trouble when some test case produces a
different register.

+  // we pass Reg_V0V1 as argument.
+  // TODO(mohit.bhakkad): Change this once we provide table-driven approach
+  RegNum.assertIsValid();
+  return (RegNum == RegMIPS32::Reg_A0A1) ? RegMIPS32::Reg_A0
+                                         : RegMIPS32::Reg_A2;
+}
+
+static inline RegNumT getI64PairSecondGPRNum(RegNumT RegNum) {
+  // CAUTION: This is not entirely correct, as it will return Reg_A3 even when
+  // we pass Reg_V0V1 as argument.
+  // TODO(mohit.bhakkad): Change this once we provide table-driven approach
+  RegNum.assertIsValid();
+  return (RegNum == RegMIPS32::Reg_A0A1) ? RegMIPS32::Reg_A1
+                                         : RegMIPS32::Reg_A3;
+}
+
 } // end of namespace RegMIPS32
 
 // Extend enum RegClass with MIPS32-specific register classes (if any).