with multiplication by constants distributed through, occasionally
those subexpressions can include both x and -x. For now, if this
condition is discovered within LSR, just prune such cases away,
as they won't be profitable. This fixes a "zero allocated in a
base register" assertion failure.

llvm-svn: 96177

the no-TLI case. But it should still default to declining the
transformation.

llvm-svn: 96152

because profitability can't be sufficiently approximated.

llvm-svn: 96148

from opt.

llvm-svn: 96135

deterministically sorted.

llvm-svn: 96071

llvm-svn: 96005

offset distributions it doesn't expect.

llvm-svn: 96002

is breaking llvm-gcc bootstrap.

llvm-svn: 95988

doesn't matter, except that ScalarEvolution tends to need less time
to fold the results this way.

llvm-svn: 95979

bug fixes, and with improved heuristics for analyzing foreign-loop
addrecs.

This change also flattens IVUsers, eliminating the stride-oriented
groupings, which makes it easier to work with.

llvm-svn: 95975

llvm-svn: 94771

llvm-svn: 94765

llvm-svn: 94123

loop-variant components, adds must be inserted after the increment.
Keep track of the increment position for this case, and insert
these adds in the correct location.

llvm-svn: 94110

llvm-svn: 94108

operands exceeds the number of registers used in the initial
solution, as that wouldn't lead to a profitable solution anyway.

llvm-svn: 94107

llvm-svn: 94104

This new version is much more aggressive about doing "full" reduction in
cases where it reduces register pressure, and also more aggressive about
rewriting induction variables to count down (or up) to zero when doing so
reduces register pressure.

It currently uses fairly simplistic algorithms for finding reuse
opportunities, but it introduces a new framework allows it to combine
multiple strategies at once to form hybrid solutions, instead of doing
all full-reduction or all base+index.

llvm-svn: 94061

llvm-svn: 92735

Remove dump routine and the associated Debug.h from a header.  Patch up
other files to compensate.

llvm-svn: 92075

contains another loop, or an instruction. The loop form is
substantially more efficient on large loops than the typical
code it replaces.

llvm-svn: 91654

llvm-svn: 91653

llvm-svn: 91647

of 91296 that caused trouble -- the Processed list needs to be
preserved for the livetime of the pass, as AddUsersIfInteresting
is called from other passes.

llvm-svn: 91641

Revert 91280-91283, 91286-91289, 91291, 91293, 91295-91296. It apparently introduced a non-deterministic behavior in the optimizer somewhere.

llvm-svn: 91598

llvm-svn: 91432

condition was inverted when the code was converted to contains().

llvm-svn: 91295

llvm-svn: 91293

the ScalarEvolution pointer into the functions which need it.

llvm-svn: 91289

llvm-svn: 91288

llvm-svn: 91287

llvm-svn: 91283

llvm-svn: 91282

SCEVExpander does this automatically.

llvm-svn: 91281

llvm-svn: 91280

llvm-svn: 89145

llvm-svn: 89123

llvm-svn: 89116

llvm-svn: 89110

  cannot be folded into target cmp instruction.
- Avoid a phase ordering issue where early cmp optimization would prevent the
  later count-to-zero optimization.
- Add missing checks which could cause LSR to reuse stride that does not have
  users.
- Fix a bug in count-to-zero optimization code which failed to find the pre-inc
  iv's phi node.
- Remove, tighten, loosen some incorrect checks disable valid transformations.
- Quite a bit of code clean up.

llvm-svn: 86969