llvm-svn: 18800

llvm-svn: 18799

 1. Actually increment the Statistic for the GV elim optzn
 2. When resolving undef branches, only resolve branches in executable blocks,
    avoiding marking a bunch of completely dead blocks live.  This has a big
    impact on the quality of the generated code.

With this patch, we positively rip up vortex, compiling Ut_MoveBytes to a
single memcpy call. In vortex we get this:

     12 ipsccp           - Number of globals found to be constant
    986 ipsccp           - Number of arguments constant propagated
   1378 ipsccp           - Number of basic blocks unreachable
   8919 ipsccp           - Number of instructions removed

llvm-svn: 18796

llvm-svn: 18795

non-address-taken global variables.

llvm-svn: 18790

In functions where we fully constant prop the return value, replace all
ret instructions with 'ret undef'.

llvm-svn: 18786

llvm-svn: 18781

llvm-svn: 18776

and the failure on make_dparser last night.

llvm-svn: 18766

This implements SCCP/ipsccp-basic.ll, rips apart Olden/mst (as described in
PR415), and does other nice things.

There is still more to come with this, but it's a start.

llvm-svn: 18752

llvm-svn: 18693

llvm-svn: 18692

successor block.  This turns cases like this:

x = a op b
if (c) {
  use x
}

into:

if (c) {
  x = a op b
  use x
}

This triggers 3965 times in spec, and is tested by
Regression/Transforms/InstCombine/sink_instruction.ll

This appears to expose a bug in the X86 backend for 177.mesa, which I'm
looking in to.

llvm-svn: 18677

llvm-svn: 18674

llvm-svn: 18670

by Bjørn Wennberg

llvm-svn: 18627

llvm-svn: 18625

Add doInitialization method to avoid overloaded virtuals

llvm-svn: 18602

gccas/gccld more than just a noop.

llvm-svn: 18456

-S

llvm-svn: 18440

llvm-svn: 18439

in scary and unknown ways before we promote it.  This fixes the miscompilation
of 188.ammp that has been plauging us since a globalopt patch went in.

Thanks a ton to Tanya for helping me diagnose the problem!

llvm-svn: 18418

This doesn't fix anything that I'm aware of, just noticed it by inspection

llvm-svn: 18417

llvm-svn: 18387

llvm-svn: 18381

This only fails on darwin or on X86 under valgrind.

llvm-svn: 18377

llvm-svn: 18369

  if (x) {
    code
    ...
  } else {
    code
    ...
  }

Turn it into:

  code
  if (x) {
    ...
  } else {
    ...
  }

This reduces code size and in some common cases allows us to completely
eliminate the conditional.  This turns several if/then/else blocks in loops
into straightline code in 179.art, turning the loops into single basic blocks
(good for modsched even!).

Maybe now brg will leave me alone ;-)

llvm-svn: 18366

llvm-svn: 18363

* Make sure we handle signed to unsigned conversion correctly
* Move this visitSetCondInst case to its own method.

llvm-svn: 18312

llvm-svn: 18309

occurs many times in crafty

llvm-svn: 18273

allows us to hoist more loads in some cases.

llvm-svn: 18265

llvm-svn: 18110

llvm-svn: 18109

Patch contributed by Michael McCracken!

llvm-svn: 18108

llvm-svn: 18028

Morten Ofstad.

llvm-svn: 17996

llvm-svn: 17992

llvm-svn: 17970