llvm-svn: 12441

http://mail.cs.uiuc.edu/pipermail/llvm-commits/Week-of-Mon-20040308/013095.html

Basically, this patch only updated the immediate dominatees of the header node
to tell them that the preheader also dominated them.  In practice, ALL
dominatees of the header node are also dominated by the preheader.

This fixes: LoopSimplify/2004-03-15-IncorrectDomUpdate.
and PR293

llvm-svn: 12434

llvm-svn: 12420

sin/cos/strlen calls and stuff.  This implements:
  LICM/call_sink_pure_function.ll
  LICM/call_sink_const_function.ll

llvm-svn: 12415

be non-empty!  This fixes LowerSwitch/2004-03-13-SwitchIsDefaultCrash.ll

llvm-svn: 12384

loop information won't see it, and we could have unreachable blocks pointing to
the non-header node of blocks in a natural loop.  This isn't tidy, so have the
loopsimplify pass clean it up.

llvm-svn: 12380

Fix InstCombine/2004-03-13-InstCombineInfLoop.ll which caused an infinite
loop compiling (I think) povray.

llvm-svn: 12365

On the testcase from GCC PR12440, which has a LOT of loops (1392 of which require
preheaders to be inserted), this speeds up the loopsimplify pass from 1.931s to
0.1875s.  The loop in question goes from 1.65s -> 0.0097s, which isn't bad. All of
these times are a debug build.

This adds a dependency on DominatorTree analysis that was not there before, but
we always had dominatortree available anyway, because LICM requires both loop
simplify and DT, so this doesn't add any extra analysis in practice.

llvm-svn: 12362

llvm-svn: 12355

llvm-svn: 12353

llvm-svn: 12318

llvm-svn: 12317

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

llvm-svn: 12197

llvm-svn: 12086

llvm-svn: 12021

Note that this is a band-aid put over a band-aid.  This just undisables
tail duplication in on very specific case that it seems to work in.

llvm-svn: 11989

Do not just inject a new prototype.

llvm-svn: 11951

Create a new AddUsesToWorkList method
optimize memmove/set/cpy of zero bytes to a noop.

llvm-svn: 11941

llvm-svn: 11940

This is a really minor thing, but might help out the 'switch statement induction'
code in simplifycfg.

llvm-svn: 11900

llvm-svn: 11821

llvm-svn: 11801

llvm-svn: 11775

llvm-svn: 11774

Also, turn 'shr int %X, 1234' into 'shr int %X, 31'

llvm-svn: 11768

llvm-svn: 11742

whether this is the sign bit or not, so check unsigned comparisons as well.

llvm-svn: 11740

llvm-svn: 11737

llvm-svn: 11735

with "predication"

llvm-svn: 11734

hot 164.gzip loop.

llvm-svn: 11702

phi.ll:test4

llvm-svn: 11494

Regression/Transforms/InstCombine/xor.ll:test20

llvm-svn: 11492

llvm-svn: 11490

llvm.setjmp/llvm.longjmp intrinsics.

llvm-svn: 11482

llvm-svn: 11474

llvm-svn: 11376

end of the function.

llvm-svn: 11313

more of a testcase for profiling information than anything that should reasonably
be used, but it's a starting point.  When I have more time I will whip this into
better shape.

llvm-svn: 11311

occurs in the program.

llvm-svn: 11249