================
@@ -592,16 +603,28 @@ Function
*AArch64Arm64ECCallLowering::buildEntryThunk(Function *F) {
}
if (F->isVarArg()) {
- // The 5th argument to variadic entry thunks is used to model the x64 sp
+ // The last argument to variadic entry thunks is used to model the x64 sp
// which is passed to the thunk in x4, this can be passed to the callee as
// the variadic argument start address after skipping over the 32 byte
// shadow store.
// The EC thunk CC will assign any argument marked as InReg to x4.
- Thunk->addParamAttr(5, Attribute::InReg);
- Value *Arg = Thunk->getArg(5);
- Arg = IRB.CreatePtrAdd(Arg, IRB.getInt64(0x20));
- Args.push_back(Arg);
+ Thunk->addParamAttr(Thunk->arg_size() - 1, Attribute::InReg);
+ Value *StackArgs = Thunk->getArg(Thunk->arg_size() - 1);
+
+ // x4 points at the 32 byte shadow store, so the first stack argument is
+ // 32 bytes further up. When the hidden return pointer took the first
+ // integer argument register, the x64 caller can only pass three of the
+ // four arguments in registers, and the fourth one, which is the first one
+ // on the stack, fills the last slot of the callee's register save area.
+ uint64_t StackOffset = 0x20;
+ if (TransformDirectToSRet) {
----------------
lhmouse wrote:
Will do.
https://github.com/llvm/llvm-project/pull/237057
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