Enable sibling call optimization of libcalls which are expanded during

legalization time. Since at legalization time there is no mapping from
SDNode back to the corresponding LLVM instruction and the return
SDNode is target specific, this requires a target hook to check for
eligibility. Only x86 and ARM support this form of sibcall optimization
right now.
rdar://8707777

llvm-svn: 120501

1 files changed, 11 insertions, 4 deletions

diff --git a/llvm/lib/Target/X86/X86FrameInfo.cpp b/llvm/lib/Target/X86/X86FrameInfo.cpp
index 494e9050282..c47b0fa6970 100644
--- a/llvm/lib/Target/X86/X86FrameInfo.cpp
+++ b/llvm/lib/Target/X86/X86FrameInfo.cpp
@@ -712,10 +712,17 @@ void X86FrameInfo::emitEpilogue(MachineFunction &MF,
 
     // Jump to label or value in register.
     if (RetOpcode == X86::TCRETURNdi || RetOpcode == X86::TCRETURNdi64) {
-      BuildMI(MBB, MBBI, DL, TII.get((RetOpcode == X86::TCRETURNdi)
-                                     ? X86::TAILJMPd : X86::TAILJMPd64)).
-        addGlobalAddress(JumpTarget.getGlobal(), JumpTarget.getOffset(),
-                         JumpTarget.getTargetFlags());
+      MachineInstrBuilder MIB =
+        BuildMI(MBB, MBBI, DL, TII.get((RetOpcode == X86::TCRETURNdi)
+                                       ? X86::TAILJMPd : X86::TAILJMPd64));
+      if (JumpTarget.isGlobal())
+        MIB.addGlobalAddress(JumpTarget.getGlobal(), JumpTarget.getOffset(),
+                             JumpTarget.getTargetFlags());
+      else {
+        assert(JumpTarget.isSymbol());
+        MIB.addExternalSymbol(JumpTarget.getSymbolName(),
+                              JumpTarget.getTargetFlags());
+      }
     } else if (RetOpcode == X86::TCRETURNmi || RetOpcode == X86::TCRETURNmi64) {
       MachineInstrBuilder MIB =
         BuildMI(MBB, MBBI, DL, TII.get((RetOpcode == X86::TCRETURNmi)