From fd3417d288c22673ec6d76dc4695989bb544373f Mon Sep 17 00:00:00 2001 From: Chad Rosier Date: Mon, 25 Feb 2013 21:59:35 +0000 Subject: [fast-isel] Add X86FastIsel::FastLowerArguments to handle functions with 6 or fewer scalar integer (i32 or i64) arguments. It completely eliminates the need for SDISel for trivial functions. Also, add the new llc -fast-isel-abort-args option, which is similar to -fast-isel-abort option, but for formal argument lowering. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@176052 91177308-0d34-0410-b5e6-96231b3b80d8 --- lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp | 10 ++++++++++ 1 file changed, 10 insertions(+) (limited to 'lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp') diff --git a/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp b/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp index a598ec4850..1c92f8bfae 100644 --- a/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp +++ b/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp @@ -145,6 +145,10 @@ EnableFastISelVerbose("fast-isel-verbose", cl::Hidden, static cl::opt EnableFastISelAbort("fast-isel-abort", cl::Hidden, cl::desc("Enable abort calls when \"fast\" instruction fails")); +static cl::opt +EnableFastISelAbortArgs("fast-isel-abort-args", cl::Hidden, + cl::desc("Enable abort calls when \"fast\" instruction fails to " + "lower formal arguments")); static cl::opt UseMBPI("use-mbpi", @@ -1048,6 +1052,12 @@ void SelectionDAGISel::SelectAllBasicBlocks(const Function &Fn) { if (LLVMBB == &Fn.getEntryBlock()) { // Lower any arguments needed in this block if this is the entry block. if (!FastIS->LowerArguments()) { + + if (EnableFastISelAbortArgs) + // The "fast" selector couldn't lower these arguments. For the + // purpose of debugging, just abort. + llvm_unreachable("FastISel didn't lower all arguments"); + // Call target indepedent SDISel argument lowering code if the target // specific routine is not successful. LowerArguments(LLVMBB); -- cgit v1.2.3-18-g5258