diff options
Diffstat (limited to 'llvm/lib')
| -rw-r--r-- | llvm/lib/Target/PowerPC/PPCISelLowering.cpp | 15 |
1 files changed, 5 insertions, 10 deletions
diff --git a/llvm/lib/Target/PowerPC/PPCISelLowering.cpp b/llvm/lib/Target/PowerPC/PPCISelLowering.cpp index f885127e6aa..3fe9fe73499 100644 --- a/llvm/lib/Target/PowerPC/PPCISelLowering.cpp +++ b/llvm/lib/Target/PowerPC/PPCISelLowering.cpp @@ -4397,18 +4397,13 @@ hasSameArgumentList(const Function *CallerFn, ImmutableCallSite CS) { static bool areCallingConvEligibleForTCO_64SVR4(CallingConv::ID CallerCC, CallingConv::ID CalleeCC) { - // tail calls are possible with fastcc and ccc. - auto isTailCallableCC = [] (CallingConv::ID CC){ - return CC == CallingConv::C || CC == CallingConv::Fast; - }; - if (!isTailCallableCC(CallerCC) || !isTailCallableCC(CalleeCC)) + // Tail or Sibling call optimization (TCO/SCO) needs callee and caller to + // have the same calling convention. + if (CallerCC != CalleeCC) return false; - // We can safely tail call both fastcc and ccc callees from a c calling - // convention caller. If the caller is fastcc, we may have less stack space - // then a non-fastcc caller with the same signature so disable tail-calls in - // that case. - return CallerCC == CallingConv::C || CallerCC == CalleeCC; + // Tail or Sibling calls can be done with fastcc/ccc. + return (CallerCC == CallingConv::Fast || CallerCC == CallingConv::C); } bool |
