This allows hello world to be compiled for Mips 64 direct object.

It takes advantage of r159299 which introduces relocation support for N64. 
elf-dump needed to be upgraded to support N64 relocations as well.

This passes make check.

Jack


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@159302 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Target/Mips/MipsInstrInfo.td

@@ -220,6 +220,7 @@ def mem : Operand<i32> {
 def mem64 : Operand<i64> {
   let PrintMethod = "printMemOperand";
   let MIOperandInfo = (ops CPU64Regs, simm16_64);
+  let EncoderMethod = "getMemEncoding";
 }
 
 def mem_ea : Operand<i32> {

test/MC/Mips/elf-N64.ll

@@ -0,0 +1,39 @@
+; RUN: llc -filetype=obj -march=mips64el -mcpu=mips64 %s -o - | elf-dump --dump-section-data  | FileCheck %s
+
+; Check for N64 relocation production.
+;
+; ModuleID = '../hello.c'
+target datalayout = "e-p:64:64:64-i1:8:8-i8:8:32-i16:16:32-i32:32:32-i64:64:64-f32:32:32-f64:64:64-f128:128:128-v64:64:64-n32"
+target triple = "mips64el-unknown-linux"
+
+@str = private unnamed_addr constant [12 x i8] c"hello world\00"
+
+define i32 @main() nounwind {
+entry:
+; Check that the appropriate relocations were created.
+
+; R_MIPS_GPREL16/R_MIPS_SUB/R_MIPS_HI16
+; CHECK:     ('r_type3', 0x05)
+; CHECK-NEXT:     ('r_type2', 0x18)
+; CHECK-NEXT:     ('r_type', 0x07)
+
+; R_MIPS_GPREL16/R_MIPS_SUB/R_MIPS_LO16
+; CHECK:     ('r_type3', 0x06)
+; CHECK-NEXT:     ('r_type2', 0x18)
+; CHECK-NEXT:     ('r_type', 0x07)
+
+; R_MIPS_GOT_OFST/R_MIPS_NONE/R_MIPS_NONE
+; CHECK:     ('r_type3', 0x00)
+; CHECK-NEXT:     ('r_type2', 0x00)
+; CHECK-NEXT:     ('r_type', 0x14)
+
+; R_MIPS_GOT_OFST/R_MIPS_NONE/R_MIPS_NONE
+; CHECK:     ('r_type3', 0x00)
+; CHECK-NEXT:     ('r_type2', 0x00)
+; CHECK-NEXT:     ('r_type', 0x15)
+
+  %puts = tail call i32 @puts(i8* getelementptr inbounds ([12 x i8]* @str, i64 0, i64 0))
+  ret i32 0
+
+}
+declare i32 @puts(i8* nocapture) nounwind