Avoid if-converting simple block that ends with unconditional branch or fallthrough unless it branches / falls to the 'false' block. Not profitable, may end up increasing code size.

llvm-svn: 37660

llvm-svn: 37659

llvm-svn: 37658

deleteValueFromRecords and loosen the types to all it to accept
Value* instead of just Instruction*, since this is what
ScalarEvolution uses internally anyway. This allows more flexibility
for future uses.

llvm-svn: 37657

for needing the DAG node to print pre-legalize extended value types, and
to get better debug messages with target-specific nodes.

llvm-svn: 37656

Handle constants in phi nodes properly.  This fixes test/Transforms/GVNPRE/2007-06-18-ConstantInPhi.ll

llvm-svn: 37655

llvm-svn: 37654

llvm-svn: 37653

llvm-svn: 37652

llvm-svn: 37651

llvm-svn: 37650

llvm-svn: 37649

llvm-svn: 37648

Be careful to erase values from all of the appropriate sets when they're not needed anymore.  This fixes a few more memory-related issues.

llvm-svn: 37647

Thanks to Nicholas for valgrinding this.

llvm-svn: 37646

Refactor GVNPRE to use a much smart method of uniquing value sets, and centralize a lot of the value numbering information.  No functionality change.

llvm-svn: 37645

with a general target hook to identify rematerializable instructions. Some
instructions are only rematerializable with specific operands, such as loads
from constant pools, while others are always rematerializable. This hook
allows both to be identified as being rematerializable with the same
mechanism.

llvm-svn: 37644

llvm-svn: 37643

llvm-svn: 37642

Anton for half of this patch.

llvm-svn: 37641

llvm-svn: 37640

llvm-svn: 37639

llvm-svn: 37638

llvm-svn: 37637

Look for VECTOR_SHUFFLE that's identity operation on either LHS or RHS. This can happen before DAGCombiner catches it.

llvm-svn: 37636

llvm-svn: 37635

llvm-svn: 37634

llvm-svn: 37633

Fix up Annotate attribute test case.
Fix DebugFilename.c test case to look for right file name.

llvm-svn: 37632

llvm-svn: 37631

llvm-svn: 37630

by making it non-recursive

llvm-svn: 37629

add operands after constant operands. The recent change to recognize
sign-extend expressions caused this to be exposed more often.

llvm-svn: 37628

llvm-svn: 37627

llvm-svn: 37626

llvm-svn: 37625

llvm-svn: 37624

llvm-svn: 37623

llvm-svn: 37622

llvm-svn: 37621