llvm-svn: 86648

llvm-svn: 86647

just one level deep.  On the testcase we go from getting this:

F1:                                               ; preds = %T2
  %F = and i1 true, %cond                         ; <i1> [#uses=1]
  br i1 %F, label %X, label %Y

to a fully threaded:

F1:                                               ; preds = %T2
  br label %Y


This changes gets us to the point where we're forming (too many) switch 
instructions on doug's strswitch testcase.

llvm-svn: 86646

llvm-svn: 86645

releases.

llvm-svn: 86644

llvm-svn: 86643

llvm-svn: 86642

llvm-svn: 86641

llvm-svn: 86640

llvm-svn: 86639

Patch by Victor Zverovich!

llvm-svn: 86638

except that the result may not be a constant.  Switch jump threading to 
use it so that it gets things like (X & 0) -> 0, which occur when phi preds
are deleted and the remaining phi pred was a zero.

llvm-svn: 86637

This patch forbids implicit conversion of DenseMap::const_iterator to
DenseMap::iterator which was possible because DenseMapIterator inherited
(publicly) from DenseMapConstIterator. Conversion the other way around is now
allowed as one may expect.

The template DenseMapConstIterator is removed and the template parameter
IsConst which specifies whether the iterator is constant is added to
DenseMapIterator.

Actually IsConst parameter is not necessary since the constness can be
determined from KeyT but this is not relevant to the fix and can be addressed
later.

Patch by Victor Zverovich!

llvm-svn: 86636

llvm-svn: 86635

llvm-svn: 86634

llvm-svn: 86633

llvm-svn: 86632

continuing after invalid PCH loads.

llvm-svn: 86631

Also, Stringrefify some more MemoryBuffer functions, and add two performance FIXMEs.

llvm-svn: 86630

llvm-svn: 86629

Allow targets to specify register classes whose member registers should not be renamed to break anti-dependencies. 

llvm-svn: 86628

simplification, this handles the foldable fcmp x,x cases among many others.

llvm-svn: 86627

and ConstantFoldCompareInstOperands.

llvm-svn: 86626

llvm-svn: 86625

Simplify[IF]Cmp pieces.  Add some predicates to CmpInst to 
determine whether a predicate is fp or int.

llvm-svn: 86624

llvm-svn: 86623

not necessary.

llvm-svn: 86621

llvm-svn: 86620

individual operands instead of taking a temporary array

llvm-svn: 86619

value.

llvm-svn: 86618

ApplyHeaderSearchOptions now.

llvm-svn: 86617

llvm-svn: 86616

llvm-svn: 86614

takes decimated instructions and applies identities to them.  This
is pretty minimal at this point, but I plan to pull some instcombine
logic out into these and similar routines.

llvm-svn: 86613

CompilerInvocation.

llvm-svn: 86612

llvm-svn: 86611

llvm-svn: 86610

Change clang-cc to expect that all inputs have the same language (so we can only construct a single LangInfo). This matches how it is used in practice (since the compiler only it invokes it for one file at a time).

llvm-svn: 86609

llvm-svn: 86608

llvm-svn: 86607