[LLVMbugs] [Bug 17506] New: [SPARC64] 64bit target tries to do tail call optimization, causing runtime assertion

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=17506

            Bug ID: 17506
           Summary: [SPARC64] 64bit target tries to do tail call
                    optimization, causing runtime assertion
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: Backend: Sparc
          Assignee: unassignedbugs at nondot.org
          Reporter: syoyofujita at gmail.com
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified

Tail call optimization isn't yet supported on Sparc 64bit.
As done in 32bit target, disable tail call optimization to fix the problem.

diff --git a/lib/Target/Sparc/SparcISelLowering.cpp
b/lib/Target/Sparc/SparcISel
index 8057b39..04d05c4 100644
--- a/lib/Target/Sparc/SparcISelLowering.cpp
+++ b/lib/Target/Sparc/SparcISelLowering.cpp
@@ -1034,6 +1034,10 @@
SparcTargetLowering::LowerCall_64(TargetLowering::CallLow
   SelectionDAG &DAG = CLI.DAG;
   SDLoc DL = CLI.DL;
   SDValue Chain = CLI.Chain;
+  bool &isTailCall = CLI.IsTailCall;
+
+  // Sparc target does not yet support tail call optimization.
+  isTailCall = false;

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