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Implement bottom-up fast-isel. This has the advantage of not requiring

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a separate DCE pass over MachineInstrs.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@107804 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Dan Gohman
2010-07-07 19:20:32 +00:00
parent f423a69839
commit 4df83ed159
9 changed files with 157 additions and 113 deletions
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lib/CodeGen/SelectionDAG/FunctionLoweringInfo.cpp
+7
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@@ -78,6 +78,13 @@ void FunctionLoweringInfo::set(const Function &fn, MachineFunction &mf) {
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();