class.  The only changes are minor:

 * Do not try to SCCP instructions that return void in the rewrite loop.
   This is silly and fool hardy, wasting a map lookup and adding an entry
   to the map which is never used.
 * If we decide something has an undefined value, rewrite it to undef,
   potentially leading to further simplications.

llvm-svn: 17816

and work better with VC++.  Patch contributed by Morten Ofstad!

llvm-svn: 17281

ignore unreachable instructions

llvm-svn: 17044

-debug-only!

llvm-svn: 16868

llvm-svn: 16432

Patch contributed by Paolo Invernizzi. Thanks Paolo!

llvm-svn: 16368

Move include/Config and include/Support into include/llvm/Config,
include/llvm/ADT and include/llvm/Support. From here on out, all LLVM
public header files must be under include/llvm/.

llvm-svn: 16137

llvm-svn: 15487

llvm-svn: 14967

- Replace ConstantPointerRef usage with GlobalValue usage
- Correct isa<Constant> for GlobalValue subclass

llvm-svn: 14947

Speed up SCCP substantially by processing overdefined values quickly.  This
patch speeds up SCCP by about 30-40% on large testcases.

llvm-svn: 14861

llvm-svn: 14839

test/Regression/Transforms/SCCP/calltest.ll

llvm-svn: 12921

types and can have arbitrary 32- and 64-bit integer types indexing into
sequential types.

llvm-svn: 12653

time from 615s to 1.49s on a large testcase that has a gigantic switch statement
that all of the blocks in the function go to (an intepreter).

llvm-svn: 12442

llvm-svn: 12318

a zero value is the most likely way to cause further simplification, so we do it.

llvm-svn: 12197

llvm-svn: 11474

llvm-svn: 10791

llvm-svn: 10779

constants as being "true" when evaluating branches.  This was introduced
because we now create constantexprs for the constants instead of failing the
fold.

llvm-svn: 10778

* Implement SCCP of load instructions, implementing Transforms/SCCP/loadtest.ll
  This allows us to fold expressions like "foo"[2], even if the pointer is only
  a conditional constant.

llvm-svn: 10767

llvm-svn: 10763

llvm-svn: 10725

llvm-svn: 9903

Header files will be on the way.

llvm-svn: 9298

llvm-svn: 9225

llvm-svn: 9027

llvm-svn: 8965

to avoid reprocessing PHI nodes needlessly.  This speeds up the big bad PHI
testcase 43%: from 104.9826 to 73.5157s

llvm-svn: 8964

llvm-svn: 8963

of a test that Bill Wendling sent me from 228.5s to 105s.  Obviously there is
more improvement to be had, but this is a nice speedup which should be "felt"
by many programs.

llvm-svn: 8962

llvm-svn: 8408

llvm-svn: 8152

llvm-svn: 7944

llvm-svn: 7492

llvm-svn: 6883

llvm-svn: 6251

llvm-svn: 6030

the visit function.  The worklist is for when their lattice value changes.

llvm-svn: 5927