[mips] Fix emission of '.option pic0' for MIPS-IV.

[dsanders]

Summary

This was a case of incorrect usage of hasMips64() vs isABI_N64()

[matheusalmeida]

LGTM.

test/CodeGen/Mips/abicalls.ll

1–3

Side note: What is this supposed to mean ? xD

[dsanders]

test/CodeGen/Mips/abicalls.ll

1–3

I think it's trying to say that there will be an MC test covering the same thing in the future.

lib/Target/Mips/MipsAsmPrinter.cpp

printFCCOperand(const MachineInstr *MI, int opNum, raw_ostream &O,
                 const char *Modifier) {
   const MachineOperand &MO = MI->getOperand(opNum);
   O << Mips::MipsFCCToString((Mips::CondCode)MO.getImm());
 }
 
 void MipsAsmPrinter::EmitStartOfAsmFile(Module &M) {
   // TODO: Need to add -mabicalls and -mno-abicalls flags.
   // Currently we assume that -mabicalls is the default.
+  bool IsABICalls = true;
+  if (IsABICalls) {
     getTargetStreamer().emitDirectiveAbiCalls();
     Reloc::Model RM = Subtarget->getRelocationModel();
-  if (RM == Reloc::Static && !Subtarget->hasMips64())
+    // FIXME: This condition should be a lot more complicated that it is here.
+    //        Ideally it should test for properties of the ABI and not the ABI
+    //        itself.
+    //        For the moment, I'm only correcting enough to make MIPS-IV work.
+    if (RM == Reloc::Static && !Subtarget->isABI_N64())
       getTargetStreamer().emitDirectiveOptionPic0();
+  }
 
   // Tell the assembler which ABI we are using
   std::string SectionName = std::string(".mdebug.") + getCurrentABIString();
   OutStreamer.SwitchSection(OutContext.getELFSection(
       SectionName, ELF::SHT_PROGBITS, 0, SectionKind::getDataRel()));
 
   // TODO: handle O64 ABI
 

test/CodeGen/Mips/abicalls.ll

 ; 
 ; When the assembler is ready a .s file for it will
 ; be created.
 
 ; Note that EF_MIPS_CPIC is set by -mabicalls which is the default on Linux
 ; TODO need to support -mno-abicalls
 
 ; RUN: llc -filetype=asm -mtriple mipsel-unknown-linux -mcpu=mips32 -relocation-model=static %s -o - | FileCheck -check-prefix=CHECK-STATIC %s
 ; RUN: llc -filetype=asm -mtriple mipsel-unknown-linux -mcpu=mips32 %s -o - | FileCheck -check-prefix=CHECK-PIC %s
+; RUN: llc -filetype=asm -mtriple mips64el-unknown-linux -mcpu=mips4 -relocation-model=static %s -o - | FileCheck -check-prefix=CHECK-PIC %s
 ; RUN: llc -filetype=asm -mtriple mips64el-unknown-linux -mcpu=mips64 -relocation-model=static %s -o - | FileCheck -check-prefix=CHECK-PIC %s
 
 ; CHECK-STATIC: .abicalls
 ; CHECK-STATIC-NEXT: pic0
 ; CHECK-PIC: .abicalls
 ; CHECK-PIC-NOT: pic0