impact on code quality or compile time.

llvm-svn: 52329

inserting extractvalues. In particular, this prevents the insertion of
extractvalues that can't be folded away later. Also add an example of when this
stuff is needed.

llvm-svn: 52328

Make the InsertBefore argument to FindInsertedValue optional, so you can find an inserted value without modifying the code.

llvm-svn: 52319

llvm-svn: 52318

llvm-svn: 52317

llvm-svn: 52316

I'm at it, rename it to FindInsertedValue.

The only functional change is that newly created instructions are no longer
added to instcombine's worklist, but that is not really necessary anyway (and
I'll commit some improvements next that will completely remove the need).

llvm-svn: 52315

llvm-svn: 52314

llvm-svn: 52313

llvm-svn: 52312

llvm-svn: 52311

still excluding types like i1 (not byte sized)
and i120 (loading an i120 requires loading an i64,
an i32, an i16 and an i8, which is expensive). 

llvm-svn: 52310

llvm-svn: 52309

llvm-svn: 52308

llvm-svn: 52306

llvm-svn: 52305

wants a 'nocapture' predicate.

llvm-svn: 52304

in this file, no other changes.

llvm-svn: 52303

the purposes of escape analysis.

llvm-svn: 52302

pointer derived from a local allocation, if the local allocation
never escapes, the pointers can't alias.  This implements PR2436

llvm-svn: 52301

Assign indices to empty basic blocks.  This will be necessary for StrongPHIElimination in the near future.

llvm-svn: 52300

This fixes several minor bugs (such as returning noalias
for comparisons between external weak functions an null) but
is mostly a cleanup.

llvm-svn: 52299

llvm-svn: 52298

them based on the end-compiler's capabilities.  This fixes PR2453

llvm-svn: 52297

llvm-svn: 52296

llvm-svn: 52295

llvm-svn: 52294

not valid if the load is volatile.  Hopefully
all wrong DAG combiner transforms of volatile
loads and stores have now been caught.

llvm-svn: 52293

a non-constant index.

llvm-svn: 52292

take into account the instrucion pointed by InsertPt. Thanks to it, 
returning the new value of InsertPt to the InsertBinop() caller can be 
avoided. The bug was, actually, in visitAddRecExpr() method which wasn't 
correctly handling changes of InsertPt. There shouldn't be any 
performance regression, as -gvn pass (run after -indvars) removes any 
redundant binops.

llvm-svn: 52291

llvm-svn: 52290

llvm-svn: 52289

llvm-svn: 52288

With this more general way, -native and -native-cbe options are handled too.

llvm-svn: 52287

llvm-svn: 52286

llvm-svn: 52285

This bug made llvm-ld unable to function with "-native" option, since the process that was used to call 'gcc' was crashing.

llvm-svn: 52284

on some code when !AfterLegalize - but since
this whole code section is turned off by an
"if (0)" it's not really turning anything on.

llvm-svn: 52276

Add a safety measure. It isn't safe to assume in ScalarEvolutionExpander that
all loops are in canonical form (but it should be safe for loops that have
AddRecs).
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llvm-svn: 52275

llvm-svn: 52270