[ppc64] Reenable sibling call optimization on ppc64 since fixed tsan library tail-call issue

print-stack-trace.cc test failure of compiler-rt has been fixed by
r266869 (http://reviews.llvm.org/D19148), so reenable sibling call
optimization on ppc64

Reviewers: nemanjai kbarton
llvm-svn: 267527

2 files changed, 2 insertions, 1 deletions

diff --git a/llvm/docs/ReleaseNotes.rst b/llvm/docs/ReleaseNotes.rst
index df34d2a20da..6d1f74c7d0a 100644
--- a/llvm/docs/ReleaseNotes.rst
+++ b/llvm/docs/ReleaseNotes.rst
@@ -114,6 +114,7 @@ Changes to the PowerPC Target
 
  Moved some optimizations from O3 to O2 (D18562)
 
+* Enable sibling call optimization on ppc64 ELFv1/ELFv2 abi
 
 Changes to the X86 Target
 -------------------------
diff --git a/llvm/lib/Target/PowerPC/PPCISelLowering.cpp b/llvm/lib/Target/PowerPC/PPCISelLowering.cpp
index 0ae4e5ebd09..72335a4f999 100644
--- a/llvm/lib/Target/PowerPC/PPCISelLowering.cpp
+++ b/llvm/lib/Target/PowerPC/PPCISelLowering.cpp
@@ -55,7 +55,7 @@ cl::desc("disable setting the node scheduling preference to ILP on PPC"), cl::Hi
 static cl::opt<bool> DisablePPCUnaligned("disable-ppc-unaligned",
 cl::desc("disable unaligned load/store generation on PPC"), cl::Hidden);
 
-static cl::opt<bool> DisableSCO("disable-ppc-sco", cl::init(true),
+static cl::opt<bool> DisableSCO("disable-ppc-sco",
 cl::desc("disable sibling call optimization on ppc"), cl::Hidden);
 
 STATISTIC(NumTailCalls, "Number of tail calls");