}
// Some CCs need callee pop.
- if (Subtarget->IsCalleePop(isVarArg, CallConv)) {
+ if (X86::isCalleePop(CallConv, Is64Bit, isVarArg, GuaranteedTailCallOpt)) {
FuncInfo->setBytesToPopOnReturn(StackSize); // Callee pops everything.
} else {
FuncInfo->setBytesToPopOnReturn(0); // Callee pops nothing.
// Create the CALLSEQ_END node.
unsigned NumBytesForCalleeToPush;
- if (Subtarget->IsCalleePop(isVarArg, CallConv))
+ if (X86::isCalleePop(CallConv, Is64Bit, isVarArg, GuaranteedTailCallOpt))
NumBytesForCalleeToPush = NumBytes; // Callee pops everything
else if (!Is64Bit && !IsTailCallConvention(CallConv) && IsStructRet)
// If this is a call to a struct-return function, the callee
return false;
}
+/// isCalleePop - Determines whether the callee is required to pop its
+/// own arguments. Callee pop is necessary to support tail calls.
+bool X86::isCalleePop(CallingConv::ID CallingConv,
+ bool is64Bit, bool IsVarArg, bool TailCallOpt) {
+ if (IsVarArg)
+ return false;
+
+ switch (CallingConv) {
+ default:
+ return false;
+ case CallingConv::X86_StdCall:
+ return !is64Bit;
+ case CallingConv::X86_FastCall:
+ return !is64Bit;
+ case CallingConv::X86_ThisCall:
+ return !is64Bit;
+ case CallingConv::Fast:
+ return TailCallOpt;
+ case CallingConv::GHC:
+ return TailCallOpt;
+ }
+}
+
/// TranslateX86CC - do a one to one translation of a ISD::CondCode to the X86
/// specific condition code, returning the condition code and the LHS/RHS of the
/// comparison to make.