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

  * Spell propagate right
  * Improve performance of phi node handling
  * Delete using directive
  * Other minor changes

llvm-svn: 5920

llvm-svn: 5872

llvm-svn: 4523

llvm-svn: 4423

    setPreservesCFG to be less confusing.

llvm-svn: 4255

    * Renamed StatisticReporter.h/cpp to Statistic.h/cpp
    * Broke constructor to take two const char * arguments instead of one, so
      that indendation can be taken care of automatically.
    * Sort the list by pass name when printing
    * Make sure to print all statistics as a group, instead of randomly when
      the statistics dtors are called.
    * Updated ProgrammersManual with new semantics.

llvm-svn: 4002

 - Implement SCCP of globals into ConstantExprs hopefully opening new
   opportunities for more SCCP.

llvm-svn: 3555

llvm-svn: 3487

llvm-svn: 3322

llvm-svn: 3318