[mips] Add more Octeon cnMips instructions

Adds the instructions ext/ext32/cins/cins32.
It also changes pop/dpop to accept the two operand version and
adds a simple pattern to generate baddu.
Tests for the two operand versions (including baddu/dmul/dpop/pop)
and the code generation pattern for baddu are included.

Reviewed by: Daniel.Sanders@imgtec.com

llvm-svn: 205449
diff --git a/llvm/test/CodeGen/Mips/octeon.ll b/llvm/test/CodeGen/Mips/octeon.ll
index 092938a..d5ff9bdf 100644
--- a/llvm/test/CodeGen/Mips/octeon.ll
+++ b/llvm/test/CodeGen/Mips/octeon.ll
@@ -1,6 +1,20 @@
 ; RUN: llc -O1 < %s -march=mips64 -mcpu=octeon | FileCheck %s -check-prefix=OCTEON
 ; RUN: llc -O1 < %s -march=mips64 -mcpu=mips64 | FileCheck %s -check-prefix=MIPS64
 
+define i64 @addi64(i64 %a, i64 %b) nounwind {
+entry:
+; OCTEON-LABEL: addi64:
+; OCTEON: jr      $ra
+; OCTEON: baddu   $2, $4, $5
+; MIPS64-LABEL: addi64:
+; MIPS64: daddu
+; MIPS64: jr
+; MIPS64: andi
+  %add = add i64 %a, %b
+  %and = and i64 %add, 255
+  ret i64 %and
+}
+
 define i64 @mul(i64 %a, i64 %b) nounwind {
 entry:
 ; OCTEON-LABEL: mul: