Avoid emitting a useless comment for a basic block with no uses (which
often happens for the entry basic block of a function)

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@2624 91177308-0d34-0410-b5e6-96231b3b80d8

Fix bug: test/Regression/Transforms/InstCombine/2002-05-14-TouchDeletedInst.ll

"This testcase caused instcombine to fail because it got the same instruction on
it's worklist more than once (which is ok), but then deleted the instruction.
Since the inst stayed on the worklist, as soon as it came back up to be
processed, bad things happened, and opt asserted."

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@2623 91177308-0d34-0410-b5e6-96231b3b80d8

New testcase

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@2622 91177308-0d34-0410-b5e6-96231b3b80d8

Fix a major source of "type unsafety", where a cast is neccesary, but can
be put either before or after a load.  We chose to cast the value loaded
instead of the pointer to load from.

Fixes bug: test/Regression/Transforms/LevelRaise/2002-05-10-LoadPeephole.ll

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@2621 91177308-0d34-0410-b5e6-96231b3b80d8

Implement elimination of loads

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@2620 91177308-0d34-0410-b5e6-96231b3b80d8

Invoke inst has side effects!

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@2619 91177308-0d34-0410-b5e6-96231b3b80d8

New file

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@2618 91177308-0d34-0410-b5e6-96231b3b80d8

Trivial cleanups

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@2617 91177308-0d34-0410-b5e6-96231b3b80d8

Add method to check to see if two _Instructions_ dominate each other

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@2616 91177308-0d34-0410-b5e6-96231b3b80d8

Initial checkin of LICM pass

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@2615 91177308-0d34-0410-b5e6-96231b3b80d8

expose LICM pass

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@2614 91177308-0d34-0410-b5e6-96231b3b80d8

Add LICM pass to compiler

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@2613 91177308-0d34-0410-b5e6-96231b3b80d8

Add prototype for LICM pass

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@2612 91177308-0d34-0410-b5e6-96231b3b80d8

Add testcase for when there is no loop header

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@2611 91177308-0d34-0410-b5e6-96231b3b80d8

A basic test that LICM is working

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@2610 91177308-0d34-0410-b5e6-96231b3b80d8

Run LICM tests

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@2609 91177308-0d34-0410-b5e6-96231b3b80d8

run LICM tests

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@2608 91177308-0d34-0410-b5e6-96231b3b80d8

Make sure to call the derived visit versions from the ranged iterator.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@2607 91177308-0d34-0410-b5e6-96231b3b80d8

We actually need this code for the release build to prevent link errors,
un#ifdef it.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@2606 91177308-0d34-0410-b5e6-96231b3b80d8

Add explicit abort so optimized build knows that the function does not return

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@2605 91177308-0d34-0410-b5e6-96231b3b80d8

Add an explicit abort so that the optimized build knows the function does
not return.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@2604 91177308-0d34-0410-b5e6-96231b3b80d8

* Allow a profile'd code build to be done with a simple 'make ENABLE_PROFILING=1'
* Only build tags for include, lib, and tools, not tests
* Turn on verbose output from bison to get information about shift/reduce
  conficts (why isn't this the default??)

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@2603 91177308-0d34-0410-b5e6-96231b3b80d8

Expose the lowerallocs pass

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@2602 91177308-0d34-0410-b5e6-96231b3b80d8

Add support for printing out statistics information when -stats is added to
the command line

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@2601 91177308-0d34-0410-b5e6-96231b3b80d8

Fix some bugs, straighten stuff out, more work needs to be done.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@2600 91177308-0d34-0410-b5e6-96231b3b80d8

Initial checkin of Statistic class

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@2599 91177308-0d34-0410-b5e6-96231b3b80d8

Initial checkin of Statistic class.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@2598 91177308-0d34-0410-b5e6-96231b3b80d8

* Add support for the -stats command line option to report how much is changed
* Make cast-of-self-ty DCE the dead cast instruction immediately instead of
  waiting for it to be DCE'd by another sweep over the function.  This speeds
  this up noticably.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@2597 91177308-0d34-0410-b5e6-96231b3b80d8

New testcase

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@2596 91177308-0d34-0410-b5e6-96231b3b80d8

remove deprecated getInstType() method

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@2595 91177308-0d34-0410-b5e6-96231b3b80d8

Expose the pi node insertion pass.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@2594 91177308-0d34-0410-b5e6-96231b3b80d8

Initial checkin of the PiNodeInsertion pass

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@2593 91177308-0d34-0410-b5e6-96231b3b80d8

Add prototype for the PiNodeInserter pass

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@2592 91177308-0d34-0410-b5e6-96231b3b80d8

Test the Pi node inserter

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@2591 91177308-0d34-0410-b5e6-96231b3b80d8

Initial checkin of testcases for Pi node inserter

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@2590 91177308-0d34-0410-b5e6-96231b3b80d8

Last minor cleanups, this code still does not work for all cases, but it
works much better than it used to.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@2588 91177308-0d34-0410-b5e6-96231b3b80d8

Two Cleanups to generated C code:
1. Avoid printing *(&globalvariable), instead print globalvariable alone
   as a special case.
2. Inline subexpressions into expressions as much as legal that preserves
   execution characteristics of expressions.  Now we get nice (but
   over-parenthesized, oh well) things like:

     ltmp_428_7 = spec__putc(((unsigned char )((bsBuff) >> 24)), (bsStream));

   instead of five seperate instructions (bsBuff & bsStream are globals).

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@2587 91177308-0d34-0410-b5e6-96231b3b80d8

* Remove CInstPrintVisitor class, incorporating it into the CWriter class
* Reorder code in the file to make it more logically laid out.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@2586 91177308-0d34-0410-b5e6-96231b3b80d8

Remove CLocalVars data structure entirely, instead of building stuff and
then printing it out, just print as we go.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@2585 91177308-0d34-0410-b5e6-96231b3b80d8

Simplify code by removing InstLocalVarsVisitor, replacing it with a simple
inst_iterator.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@2584 91177308-0d34-0410-b5e6-96231b3b80d8

* Clean up how PHI nodes are handled
* Correct global variable references
* Fix loads & stores with zero indices
* Do not emit an else part of a branch if there is no code (no phi node
  and a fallthrough branch), makes code more readable to get:
  if (l2_cond240) {
    goto l13_bb10;
  }

with no else{} branch

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@2583 91177308-0d34-0410-b5e6-96231b3b80d8

Handle setcc <global*>, 0 instructions, Global pointers are never null!

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@2582 91177308-0d34-0410-b5e6-96231b3b80d8

Give the longer name to the instruction that will probably be eliminated later

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@2581 91177308-0d34-0410-b5e6-96231b3b80d8

New testcase for wierd combine opportunity found in bzip2 benchmark

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@2580 91177308-0d34-0410-b5e6-96231b3b80d8

Emit:
  l3_reg109 = l81_this->field0;
Instead of:
  l3_reg109 = l81_this[0u].field0;

where possible

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@2579 91177308-0d34-0410-b5e6-96231b3b80d8

* Print structures types correctly
* Clean up generated code to not emit basic block labels and goto
  instructions if they are unneccesary (for example, fall throughs)

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@2578 91177308-0d34-0410-b5e6-96231b3b80d8

* Continue cleanup of type printing code
* Print a newline after a malloc instruction
* Convert unprintable characters to x_ instead of _x so that we don't
  generate identifiers that start with underscores

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@2577 91177308-0d34-0410-b5e6-96231b3b80d8

Gut the type printing code so there is only one copy of it instead of 3

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@2576 91177308-0d34-0410-b5e6-96231b3b80d8

* Remove dead "constant printing" code
* Mangle names with only a prefix so that they are easier on the eyes.
* Put spaces around binary operators with low precedence to make them easier to read
* Don't prefix function names with &, although it's correct, it's unnecesary and
  easier to read without it.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@2575 91177308-0d34-0410-b5e6-96231b3b80d8

Remove gross "Operand" instance variable
Remove lots of unneccesary arguments to methods

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@2574 91177308-0d34-0410-b5e6-96231b3b80d8

Simplify and clean up function calls.
Now indirect function calls work, except that function pointer types are not correct.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@2573 91177308-0d34-0410-b5e6-96231b3b80d8

* Remove dead function
* Print C strings correctly
* Expand C escape sequences nicely (ie \n \t, etc get generated instead of hex escapes)

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@2572 91177308-0d34-0410-b5e6-96231b3b80d8

Make Getelementptr, load & store all work the right way.
Handle global variables correctly.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@2571 91177308-0d34-0410-b5e6-96231b3b80d8

Many random fixes:
 * Use binary operator logic for shifts instead of cloning code
 * Unary not is '~' not '!'

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@2570 91177308-0d34-0410-b5e6-96231b3b80d8

Incorporate and purge function before and after printing them so unnamed values
have some hope of working right.

Function calls do not try to emit an lvalue if they return void.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@2569 91177308-0d34-0410-b5e6-96231b3b80d8

Factor out the code to print a value to ONE place.
It turns out that unnamed values DO NOT work at all, that's next on the list.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@2568 91177308-0d34-0410-b5e6-96231b3b80d8

First wave of cleanups, looks like the first of many.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@2567 91177308-0d34-0410-b5e6-96231b3b80d8

Add ability to transform (x - (y - z)) into (x + (z - y))

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@2566 91177308-0d34-0410-b5e6-96231b3b80d8

Fix broken testcase

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@2565 91177308-0d34-0410-b5e6-96231b3b80d8

Clean up dis so that it does not print out code in various traversal orders.
Now it only output llvm or C code.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@2564 91177308-0d34-0410-b5e6-96231b3b80d8

Add two new patterns that instcombine should or does handle

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@2563 91177308-0d34-0410-b5e6-96231b3b80d8

Print out post dominance data structures more nicely

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@2562 91177308-0d34-0410-b5e6-96231b3b80d8

* Combine: A-(-B) -> A + B
* Bugfix:  A + -B and -A + B

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@2561 91177308-0d34-0410-b5e6-96231b3b80d8

New testcase for LICM reassociation

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@2560 91177308-0d34-0410-b5e6-96231b3b80d8

Initial checkin of expression reassociation pass

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@2559 91177308-0d34-0410-b5e6-96231b3b80d8

Add expr reassociation pass prototype

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@2558 91177308-0d34-0410-b5e6-96231b3b80d8

Expose expression reassociation

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@2557 91177308-0d34-0410-b5e6-96231b3b80d8

Run expression reassociation as part of gccas

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@2556 91177308-0d34-0410-b5e6-96231b3b80d8

Add some simple test of reassociation

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@2555 91177308-0d34-0410-b5e6-96231b3b80d8

run reassociate tests

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@2554 91177308-0d34-0410-b5e6-96231b3b80d8

Verify that function call arguments match the function signature

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@2553 91177308-0d34-0410-b5e6-96231b3b80d8

*** empty log message ***

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@2552 91177308-0d34-0410-b5e6-96231b3b80d8

Spell aggressive correctly

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@2551 91177308-0d34-0410-b5e6-96231b3b80d8

Give the unified exit node a name

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@2550 91177308-0d34-0410-b5e6-96231b3b80d8

Spell aggressive right

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@2549 91177308-0d34-0410-b5e6-96231b3b80d8

Fix misspelling

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@2548 91177308-0d34-0410-b5e6-96231b3b80d8

Fix bug: test/Regression/Transforms/ADCE/2002-01-31-UseStuckAround.ll
Cleanup code a lot

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@2547 91177308-0d34-0410-b5e6-96231b3b80d8

New testcase for adce

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@2546 91177308-0d34-0410-b5e6-96231b3b80d8

Build the ADCE tests

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@2545 91177308-0d34-0410-b5e6-96231b3b80d8

ADCE tests

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@2544 91177308-0d34-0410-b5e6-96231b3b80d8

Implement constant propogation of PHI instructions like this:
  X = phi(0, 0, 0)

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@2543 91177308-0d34-0410-b5e6-96231b3b80d8

Oops, forgot to check in makefile

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@2542 91177308-0d34-0410-b5e6-96231b3b80d8

Add check that phi nodes get constant propogated away

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@2541 91177308-0d34-0410-b5e6-96231b3b80d8

constprop doesn't delete dead instructions, it just makes them dead.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@2540 91177308-0d34-0410-b5e6-96231b3b80d8

Add testcase for not expressions

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@2539 91177308-0d34-0410-b5e6-96231b3b80d8

Merge all include/llvm/Transforms/Scalar/* into a single Scalar.h

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@2538 91177308-0d34-0410-b5e6-96231b3b80d8

Merge all individual .h files into a single Scalar.h file

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@2537 91177308-0d34-0410-b5e6-96231b3b80d8

This doesn't use DCE!

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@2536 91177308-0d34-0410-b5e6-96231b3b80d8

Extend TargetData::getIndexedOffset to support arrays and pointers!

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@2535 91177308-0d34-0410-b5e6-96231b3b80d8

These files are supersumed by include/llvm/Transforms/Scalar.h

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@2534 91177308-0d34-0410-b5e6-96231b3b80d8

New header file to replace all of the Scalar/*.h files.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@2533 91177308-0d34-0410-b5e6-96231b3b80d8

Fix makefiles after shuffling passes around the libraries

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@2532 91177308-0d34-0410-b5e6-96231b3b80d8

Move UnifyFunctionExitNodes to Utils library: final resting place this time

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@2531 91177308-0d34-0410-b5e6-96231b3b80d8

fix comments and documentation in file

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@2530 91177308-0d34-0410-b5e6-96231b3b80d8

Split ChangeAllocations.cpp into Raise & LowerAllocations.cpp

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@2529 91177308-0d34-0410-b5e6-96231b3b80d8

Checkin headers for Utils library

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@2528 91177308-0d34-0410-b5e6-96231b3b80d8

Cleanup implementation a bit + comments

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@2527 91177308-0d34-0410-b5e6-96231b3b80d8

Cleanup implementation a bit

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@2526 91177308-0d34-0410-b5e6-96231b3b80d8

Change script to not even look in test/ directory, significantly speeding it up

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@2525 91177308-0d34-0410-b5e6-96231b3b80d8

Oops, somehow lost a slash.  Fixed

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@2524 91177308-0d34-0410-b5e6-96231b3b80d8