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author | Dan Gohman <gohman@apple.com> | 2008-08-20 00:47:54 +0000 |
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committer | Dan Gohman <gohman@apple.com> | 2008-08-20 00:47:54 +0000 |
commit | 3e697cfa979538c77459a3e4237e9bc1ac638761 (patch) | |
tree | ac2e88bdfefe7961c099b9fa890a7f9ee39759db /lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp | |
parent | a7f2dff98e68ed8b2ac32f953768c04f26b52bea (diff) | |
download | llvm-3e697cfa979538c77459a3e4237e9bc1ac638761.tar.gz llvm-3e697cfa979538c77459a3e4237e9bc1ac638761.tar.bz2 llvm-3e697cfa979538c77459a3e4237e9bc1ac638761.tar.xz |
Add support for running SelectionDAG if FastISel fails. This is under
a command-line option, so that the default behavior is an abort, which
is useful for exposing code that isn't supported yet.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@55028 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp')
-rw-r--r-- | lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp | 27 |
1 files changed, 16 insertions, 11 deletions
diff --git a/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp b/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp index 188d938819..6a626b90e3 100644 --- a/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp +++ b/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp @@ -59,7 +59,10 @@ EnableLegalizeTypes("enable-legalize-types", cl::Hidden); static cl::opt<bool> EnableFastISel("fast-isel", cl::Hidden, cl::desc("Enable the experimental \"fast\" instruction selector")); - +static cl::opt<bool> +DisableFastISelAbort("fast-isel-no-abort", cl::Hidden, + cl::desc("Use the SelectionDAGISel when \"fast\" instruction " + "selection fails")); #ifndef NDEBUG static cl::opt<bool> @@ -5103,6 +5106,7 @@ void SelectionDAGISel::BuildSelectionDAG(SelectionDAG &DAG, BasicBlock *LLVMBB, // landing pads, which also require special handling. // For now, also exclude blocks with terminators that aren't // unconditional branches. + BasicBlock::iterator Begin = LLVMBB->begin(); if (EnableFastISel && LLVMBB != &LLVMBB->getParent()->getEntryBlock() && !BB->isLandingPad() && @@ -5110,17 +5114,18 @@ void SelectionDAGISel::BuildSelectionDAG(SelectionDAG &DAG, BasicBlock *LLVMBB, cast<BranchInst>(LLVMBB->getTerminator())->isUnconditional()) { if (FastISel *F = TLI.createFastISel(BB, &FuncInfo.MF, TLI.getTargetMachine().getInstrInfo())) { - BasicBlock::iterator I = - F->SelectInstructions(LLVMBB->begin(), LLVMBB->end(), FuncInfo.ValueMap); - if (I == LLVMBB->end()) + Begin = F->SelectInstructions(Begin, LLVMBB->end(), FuncInfo.ValueMap); + if (Begin == LLVMBB->end()) // The "fast" selector selected the entire block, so we're done. return; - // The "fast" selector couldn't handle something and bailed. - // For the temporary purpose of debugging, just abort. - I->dump(); - assert(0 && "FastISel didn't select the entire block"); - abort(); + if (!DisableFastISelAbort) { + // The "fast" selector couldn't handle something and bailed. + // For the purpose of debugging, just abort. + DEBUG(Begin->dump()); + assert(0 && "FastISel didn't select the entire block"); + abort(); + } } } @@ -5172,13 +5177,13 @@ void SelectionDAGISel::BuildSelectionDAG(SelectionDAG &DAG, BasicBlock *LLVMBB, } // Lower all of the non-terminator instructions. - for (BasicBlock::iterator I = LLVMBB->begin(), E = --LLVMBB->end(); + for (BasicBlock::iterator I = Begin, E = --LLVMBB->end(); I != E; ++I) SDL.visit(*I); // Ensure that all instructions which are used outside of their defining // blocks are available as virtual registers. Invoke is handled elsewhere. - for (BasicBlock::iterator I = LLVMBB->begin(), E = LLVMBB->end(); I != E;++I) + for (BasicBlock::iterator I = Begin, E = LLVMBB->end(); I != E;++I) if (!I->use_empty() && !isa<PHINode>(I) && !isa<InvokeInst>(I)) { DenseMap<const Value*, unsigned>::iterator VMI =FuncInfo.ValueMap.find(I); if (VMI != FuncInfo.ValueMap.end()) |