diff options
Diffstat (limited to 'lib')
| -rw-r--r-- | lib/Target/X86/X86ISelLowering.cpp | 15 |
1 files changed, 12 insertions, 3 deletions
diff --git a/lib/Target/X86/X86ISelLowering.cpp b/lib/Target/X86/X86ISelLowering.cpp index 5dbe0bb..c0ebade 100644 --- a/lib/Target/X86/X86ISelLowering.cpp +++ b/lib/Target/X86/X86ISelLowering.cpp @@ -2258,9 +2258,18 @@ X86TargetLowering::IsEligibleForTailCallOptimization(SDValue Callee, return true; // Look for obvious safe cases to perform tail call optimization. - // For now, only consider callees which take no arguments. - if (!Outs.empty()) - return false; + // If the callee takes no arguments then go on to check the results of the + // call. + if (!Outs.empty()) { + // Check if stack adjustment is needed. For now, do not do this if any + // argument is passed on the stack. + SmallVector<CCValAssign, 16> ArgLocs; + CCState CCInfo(CalleeCC, isVarArg, getTargetMachine(), + ArgLocs, *DAG.getContext()); + CCInfo.AnalyzeCallOperands(Outs, CCAssignFnForNode(CalleeCC)); + if (CCInfo.getNextStackOffset()) + return false; + } // If the caller does not return a value, then this is obviously safe. // This is one case where it's safe to perform this optimization even |