Stop emitting instructions with the name "tmp" they eat up memory and have to be uniqued, without any benefit.

If someone prefers %tmp42 to %42, run instnamer.

llvm-svn: 140634

split landingpad instructions into a PHI node.
PR11016

llvm-svn: 140592

Disabling aggressive LSR saves compilation time, and with the new
indvars behavior usually improves performance.

llvm-svn: 140590

llvm-svn: 140583

The minor bug heuristic was noticed by inspection. I added the
isLoser/isValid helpers because they will become more
important with subsequent checkins.

llvm-svn: 140580

No test case. Noticed by inspection and I doubt it ever affects the
outcome of the overall heuristic, let alone final codegen.

llvm-svn: 140431

llvm-svn: 140327

Make sure IPSCCP never marks a tracked call as overdefined in SCCPSolver::ResolvedUndefsIn.  If we do, we can end up in a situation where a function is resolved to return a constant, but the caller is marked overdefined, which confuses the code later.

<rdar://problem/9956541> (again).

llvm-svn: 140210

Some passes require breaking critical edges before they're called. Don't
segfault because of that.

llvm-svn: 140196

Place the check for an exit landing pad where it will be run on both code paths through the if-then-else.

llvm-svn: 140195

The landing pad must accompany the invoke when it's extracted. However, if it
does, then the loop isn't properly extracted. I.e., the resulting extraction has
a loop in it. The extracted function is then extracted, etc. resulting in an
infinite loop.

llvm-svn: 140193

llvm-svn: 140176

extract its associated landing pad block as well. However, that landing pad
block may have more than one predecessor. So split the landing pad block so that
individual landing pads have only one predecessor.

This type of transformation may produce a false positive with bugpoint.

llvm-svn: 140173

llvm-svn: 140172

llvm-svn: 140169

llvm-svn: 140168

llvm-svn: 140167

llvm-svn: 140164

llvm-svn: 140156

llvm-svn: 140154

GCOVLines is always accessed through a StringMap where the key is FileName.

llvm-svn: 140151

There is no need to write a local utility routine to find subprogram info if the utility routine is already available in DebugInfo.

llvm-svn: 140145

llvm-svn: 140094

extract the landing pad block. Otherwise, there will be a situation where the
invoke's unwind edge lands on a non-landing pad.

We also forbid the user from extracting the landing pad block by itself. Again,
this is not a valid transformation.

llvm-svn: 140083

Fix an infinite loop where a transform in InstCombiner::visitAnd claims a construct is changed when it is not.  (See included testcase.)

Patch by Xiaoyi Guo.

llvm-svn: 140072

llvm-svn: 140026

llvm-svn: 139842

llvm-svn: 139768

which could theoretically throw.

llvm-svn: 139710

in memory relevant to the optimizer. rdar://10050579.

llvm-svn: 139708

llvm-svn: 139583

llvm-svn: 139579

llvm-svn: 139574

llvm-svn: 139571

llvm-svn: 139565

No tests; these changes aren't really interesting in the sense that the logic is the same for volatile and atomic.

I believe this completes all of the changes necessary for the optimizer to handle loads and stores correctly.  I'm going to try and come up with some additional testing, though.

llvm-svn: 139533

llvm-svn: 139517

better.

Don't immediately give up when an add operation can't be trivially
sign/zero-extended within a loop. If it has NSW/NUW flags, generate a
new expression with sign extended (non-recurrent) operand. As before,
if SCEV says that all sign extends are loop invariant, then we can
widen the operation.

llvm-svn: 139453

llvm-svn: 139375

llvm-svn: 139169