diff options
| author | Nuno Lopes <nunoplopes@sapo.pt> | 2012-06-25 17:11:47 +0000 |
|---|---|---|
| committer | Nuno Lopes <nunoplopes@sapo.pt> | 2012-06-25 17:11:47 +0000 |
| commit | 3769fe149bb47dfdaa8ac39b7a4c26cf98ec503e (patch) | |
| tree | 3b6f81ade44460101257ea285f2fa1cafe3ea71e /lib/Transforms/Scalar/SimplifyCFGPass.cpp | |
| parent | e8742d084c54e9cd230fa03d368f0fedac2106cb (diff) | |
improve optimization of invoke instructions:
- simplifycfg: invoke undef/null -> unreachable
- instcombine: invoke new -> invoke expect(0, 0) (an arbitrary NOOP intrinsic; only done if the allocated memory is unused, of course)
- verifier: allow invoke of intrinsics (to make the previous step work)
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@159146 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/Transforms/Scalar/SimplifyCFGPass.cpp')
| -rw-r--r-- | lib/Transforms/Scalar/SimplifyCFGPass.cpp | 9 |
1 files changed, 7 insertions, 2 deletions
diff --git a/lib/Transforms/Scalar/SimplifyCFGPass.cpp b/lib/Transforms/Scalar/SimplifyCFGPass.cpp index a66b3e3825..594369780a 100644 --- a/lib/Transforms/Scalar/SimplifyCFGPass.cpp +++ b/lib/Transforms/Scalar/SimplifyCFGPass.cpp @@ -157,11 +157,16 @@ static bool MarkAliveBlocks(BasicBlock *BB, } // Turn invokes that call 'nounwind' functions into ordinary calls. - if (InvokeInst *II = dyn_cast<InvokeInst>(BB->getTerminator())) - if (II->doesNotThrow()) { + if (InvokeInst *II = dyn_cast<InvokeInst>(BB->getTerminator())) { + Value *Callee = II->getCalledValue(); + if (isa<ConstantPointerNull>(Callee) || isa<UndefValue>(Callee)) { + ChangeToUnreachable(II, true); + Changed = true; + } else if (II->doesNotThrow()) { ChangeToCall(II); Changed = true; } + } Changed |= ConstantFoldTerminator(BB, true); for (succ_iterator SI = succ_begin(BB), SE = succ_end(BB); SI != SE; ++SI) |