diff options
Diffstat (limited to 'llvm/lib')
| -rw-r--r-- | llvm/lib/Target/PowerPC/PPCISelLowering.cpp | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/llvm/lib/Target/PowerPC/PPCISelLowering.cpp b/llvm/lib/Target/PowerPC/PPCISelLowering.cpp index e2cc9212597..7dfff5b83a7 100644 --- a/llvm/lib/Target/PowerPC/PPCISelLowering.cpp +++ b/llvm/lib/Target/PowerPC/PPCISelLowering.cpp @@ -4049,10 +4049,17 @@ PPCTargetLowering::IsEligibleForTailCallOptimization_64SVR4( if (CalleeCC != CallingConv::Fast && CalleeCC != CallingConv::C) return false; - // Functions containing by val parameters are not supported. + // Caller contains any byval parameter is not supported. if (any_of(Ins, [](const ISD::InputArg &IA) { return IA.Flags.isByVal(); })) return false; + // Callee contains any byval parameter is not supported, too. + // Note: This is a quick work around, because in some cases, e.g. + // caller's stack size > callee's stack size, we are still able to apply + // sibling call optimization. See: https://reviews.llvm.org/D23441#513574 + if (any_of(Outs, [](const ISD::OutputArg& OA) { return OA.Flags.isByVal(); })) + return false; + // No TCO/SCO on indirect call because Caller have to restore its TOC if (!isFunctionGlobalAddress(Callee) && !isa<ExternalSymbolSDNode>(Callee)) |
