Reapply bottom-up fast-isel, with several fixes for x86-32:
- Check getBytesToPopOnReturn().
- Eschew ST0 and ST1 for return values.
- Fix the PIC base register initialization so that it doesn't ever
fail to end up the top of the entry block.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@108039 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/SelectionDAG/FunctionLoweringInfo.cpp b/lib/CodeGen/SelectionDAG/FunctionLoweringInfo.cpp
index 6d9f102..928e1ec 100644
--- a/lib/CodeGen/SelectionDAG/FunctionLoweringInfo.cpp
+++ b/lib/CodeGen/SelectionDAG/FunctionLoweringInfo.cpp
@@ -82,6 +82,13 @@
MF = &mf;
RegInfo = &MF->getRegInfo();
+ // Check whether the function can return without sret-demotion.
+ SmallVector<ISD::OutputArg, 4> Outs;
+ GetReturnInfo(Fn->getReturnType(),
+ Fn->getAttributes().getRetAttributes(), Outs, TLI);
+ CanLowerReturn = TLI.CanLowerReturn(Fn->getCallingConv(), Fn->isVarArg(),
+ Outs, Fn->getContext());
+
// Create a vreg for each argument register that is not dead and is used
// outside of the entry block for the function.
for (Function::const_arg_iterator AI = Fn->arg_begin(), E = Fn->arg_end();
@@ -174,6 +181,7 @@
#endif
LiveOutRegInfo.clear();
ArgDbgValues.clear();
+ RegFixups.clear();
}
/// CreateReg - Allocate a single virtual register for the given type.