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


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@120501 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 13 insertions, 10 deletions

diff --git a/lib/Target/ARM/ARMFrameInfo.cpp b/lib/Target/ARM/ARMFrameInfo.cpp
index e2531d04d0..58a7c61d90 100644
--- a/lib/Target/ARM/ARMFrameInfo.cpp
+++ b/lib/Target/ARM/ARMFrameInfo.cpp
@@ -374,16 +374,19 @@ void ARMFrameInfo::emitEpilogue(MachineFunction &MF,
     MachineOperand &JumpTarget = MBBI->getOperand(0);
 
     // Jump to label or value in register.
-    if (RetOpcode == ARM::TCRETURNdi) {
-      BuildMI(MBB, MBBI, dl,
-            TII.get(STI.isThumb() ? ARM::TAILJMPdt : ARM::TAILJMPd)).
-        addGlobalAddress(JumpTarget.getGlobal(), JumpTarget.getOffset(),
-                         JumpTarget.getTargetFlags());
-    } else if (RetOpcode == ARM::TCRETURNdiND) {
-      BuildMI(MBB, MBBI, dl,
-            TII.get(STI.isThumb() ? ARM::TAILJMPdNDt : ARM::TAILJMPdND)).
-        addGlobalAddress(JumpTarget.getGlobal(), JumpTarget.getOffset(),
-                         JumpTarget.getTargetFlags());
+    if (RetOpcode == ARM::TCRETURNdi || RetOpcode == ARM::TCRETURNdiND) {
+      unsigned TCOpcode = (RetOpcode == ARM::TCRETURNdi)
+        ? (STI.isThumb() ? ARM::TAILJMPdt : ARM::TAILJMPd)
+        : (STI.isThumb() ? ARM::TAILJMPdNDt : ARM::TAILJMPdND);
+      MachineInstrBuilder MIB = BuildMI(MBB, MBBI, dl, TII.get(TCOpcode));
+      if (JumpTarget.isGlobal())
+        MIB.addGlobalAddress(JumpTarget.getGlobal(), JumpTarget.getOffset(),
+                             JumpTarget.getTargetFlags());
+      else {
+        assert(JumpTarget.isSymbol());
+        MIB.addExternalSymbol(JumpTarget.getSymbolName(),
+                              JumpTarget.getTargetFlags());
+      }
     } else if (RetOpcode == ARM::TCRETURNri) {
       BuildMI(MBB, MBBI, dl, TII.get(ARM::TAILJMPr)).
         addReg(JumpTarget.getReg(), RegState::Kill);