MIPS: Use JIC/JIALC offset when possible

src/mips/assembler-mips.cc

Index: src/mips/assembler-mips.cc
diff --git a/src/mips/assembler-mips.cc b/src/mips/assembler-mips.cc
index 865e64c87d26fabb81a7511d774d1fb9b8440c60..fb47ef4a1599cee65f9a57a16485379540c3048b 100644
--- a/src/mips/assembler-mips.cc
+++ b/src/mips/assembler-mips.cc
@@ -1937,6 +1937,7 @@ void Assembler::lui(Register rd, int32_t j) {
 void Assembler::aui(Register rt, Register rs, int32_t j) {
   // This instruction uses same opcode as 'lui'. The difference in encoding is
   // 'lui' has zero reg. for rs field.
+  DCHECK(IsMipsArchVariant(kMips32r6));
   DCHECK(!(rs.is(zero_reg)));
   DCHECK(is_uint16(j));
   GenInstrImmediate(LUI, rs, rt, j);
@@ -3200,6 +3201,11 @@ Address Assembler::target_address_at(Address pc) {
                                      GetImmediate16(instr2));
   }
 
+  if (IsLui(instr1) && IsJicOrJialc(instr2)) {
+    // Assemble the 32 bit value.

[ivica.bogosavljevic, 2016/12/12 13:29:39]

You already checked IsLui in the previous if statement, and you are calling the
same function again.

make two nested if's or save the value of IsLui to a variable in order to avoid
calling it two times.

+    return reinterpret_cast<Address>(CreateTargetAddress(instr1, instr2));
+  }
+
   // We should never get here, force a bad address if we do.
   UNREACHABLE();
   return (Address)0x0;