When looking at the 64-bit SVR4 indirect call sequence, I noticed
an unnecessary load of r12. And indeed the code says:
// R12 must contain the address of an indirect callee.
But this is not correct; in the 64-bit SVR4 (ELFv1) ABI, there is
no need to load r12 at this point. It seems this code and comment
is a remnant of code originally shared with the Darwin ABI ...
This patch simply removes the unnecessary load.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@211203
91177308-0d34-0410-b5e6-
96231b3b80d8
SDValue AddPtr = DAG.getNode(ISD::ADD, dl, PtrVT, StackPtr, PtrOff);
Chain = DAG.getStore(Val.getValue(1), dl, Val, AddPtr, MachinePointerInfo(),
false, false, 0);
- // R12 must contain the address of an indirect callee. This does not
- // mean the MTCTR instruction must use R12; it's easier to model this
- // as an extra parameter, so do that.
- RegsToPass.push_back(std::make_pair((unsigned)PPC::X12, Callee));
}
// Build a sequence of copy-to-reg nodes chained together with token chain