Target/X86: Tweak win64's tailcall.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@124272 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/X86/X86ISelLowering.cpp b/lib/Target/X86/X86ISelLowering.cpp
index edd535e..3fcb5e7 100644
--- a/lib/Target/X86/X86ISelLowering.cpp
+++ b/lib/Target/X86/X86ISelLowering.cpp
@@ -2476,9 +2476,6 @@
MachineFunction &MF = DAG.getMachineFunction();
if (MF.getInfo<X86MachineFunctionInfo>()->getBytesToPopOnReturn())
return false;
- if (Subtarget->isTargetWin64())
- // Win64 ABI has additional complications.
- return false;
// Check if the arguments are already laid out in the right way as
// the caller's fixed stack objects.
@@ -10078,6 +10075,30 @@
MachineBasicBlock *BB) const {
switch (MI->getOpcode()) {
default: assert(false && "Unexpected instr type to insert");
+ case X86::TAILJMPd64:
+ case X86::TAILJMPr64:
+ case X86::TAILJMPm64:
+ assert(!"TAILJMP64 would not be touched here.");
+ case X86::TCRETURNdi64:
+ case X86::TCRETURNri64:
+ case X86::TCRETURNmi64:
+ // Defs of TCRETURNxx64 has Win64's callee-saved registers, as subset.
+ // On AMD64, additional defs should be added before register allocation.
+ if (!Subtarget->isTargetWin64()) {
+ MI->addRegisterDefined(X86::RSI);
+ MI->addRegisterDefined(X86::RDI);
+ MI->addRegisterDefined(X86::XMM6);
+ MI->addRegisterDefined(X86::XMM7);
+ MI->addRegisterDefined(X86::XMM8);
+ MI->addRegisterDefined(X86::XMM9);
+ MI->addRegisterDefined(X86::XMM10);
+ MI->addRegisterDefined(X86::XMM11);
+ MI->addRegisterDefined(X86::XMM12);
+ MI->addRegisterDefined(X86::XMM13);
+ MI->addRegisterDefined(X86::XMM14);
+ MI->addRegisterDefined(X86::XMM15);
+ }
+ return BB;
case X86::WIN_ALLOCA:
return EmitLoweredWinAlloca(MI, BB);
case X86::TLSCall_32: