[mips] Correct tail call encoding for MIPSR6

r277708 enabled tails calls for MIPS but used the 'jr' instruction when the 
jump target was held in a register. For MIPSR6, 'jalr $zero, $reg' should
have been used. Additionally, add missing patterns for external and global
symbols for tail calls.

Reviewers: dsanders, vkalintiris

Differential Review: https://reviews.llvm.org/D23301

llvm-svn: 279064

1 files changed, 1 insertions, 1 deletions

diff --git a/llvm/lib/Target/Mips/MipsDelaySlotFiller.cpp b/llvm/lib/Target/Mips/MipsDelaySlotFiller.cpp
index c473c6ccd06..eb0d3142bec 100644
--- a/llvm/lib/Target/Mips/MipsDelaySlotFiller.cpp
+++ b/llvm/lib/Target/Mips/MipsDelaySlotFiller.cpp
@@ -560,7 +560,7 @@ static int getEquivalentCallShort(int Opcode) {
     return Mips::JALRS16_MM;
   case Mips::TAILCALL_MM:
     llvm_unreachable("Attempting to shorten the TAILCALL_MM pseudo!");
-  case Mips::TAILCALLREG_MM:
+  case Mips::TAILCALLREG:
     return Mips::JR16_MM;
   default:
     llvm_unreachable("Unexpected call instruction for microMIPS.");