patch contributed by m-s!

llvm-svn: 55270

use raw_ostream instead of std::ostream.  Among other goodness,
this speeds up llvm-dis of kc++ with a release build from 0.85s
to 0.49s (88% faster).

Other interesting changes:
 1) This makes Value::print be non-virtual.
 2) AP[S]Int and ConstantRange can no longer print to ostream directly, 
    use raw_ostream instead.
 3) This fixes a bug in raw_os_ostream where it didn't flush itself 
    when destroyed.
 4) This adds a new SDNode::print method, instead of only allowing "dump".


A lot of APIs have both std::ostream and raw_ostream versions, it would
be useful to go through and systematically anihilate the std::ostream 
versions.

This passes dejagnu, but there may be minor fallout, plz let me know if
so and I'll fix it.

llvm-svn: 55263

indices that start with an array subscript.  x->field[10000] is just 
as bad as (*X)[14][10000].

llvm-svn: 55226

Patch contributed by m-s.

llvm-svn: 55167

slowdown in bzip2.

llvm-svn: 55113

llvm-svn: 55087

llvm-svn: 55035

llvm-svn: 54979

predicate, swap the order of the operands.

llvm-svn: 54907

produce an xor by 127.

llvm-svn: 54906

llvm-svn: 54878

llvm-svn: 54877

the predicate.

Also, make this optz'n apply in more cases where it's safe to do so.

llvm-svn: 54876

Remove GCSE, ValueNumbering, and LoadValueNumbering.  These have been deprecated for almost a year; it's finally time for them to go away.

llvm-svn: 54822

llvm-svn: 54821

llvm-svn: 54813

by ~10% on some testcases.

llvm-svn: 54811

llvm-svn: 54804

llvm-svn: 54792

llvm-svn: 54786

llvm-svn: 54780

can have a non-negative result; for example, -16%16 is 0. Also,
clarify the related comments. This fixes PR2670.

llvm-svn: 54767

track individual leaf values in such cases, so it needs to treat
struct values as normal values in this case.

llvm-svn: 54760

llvm-svn: 54754

llvm-svn: 54710

do for scalars.  Patch contributed by Nicolas Capens

This also generalizes the previous xforms to work on long double, now that 
isExactlyValue works for long double.

llvm-svn: 54653

names. This can save a lot of allocations if you aren't going to be
looking at the output.

llvm-svn: 54546

when it meant to be emitting undef indices.

llvm-svn: 54417

Fix PR2355: bug in ChangeCompareStride. When the loop termination compare is the only use of its iv stride, the stride can be eliminated by moving it to another stride. If the scale is negative, swap the predicate instead of using a inverse predicate.

llvm-svn: 54415

llvm-svn: 54408

matters, the result is undefined anyway.

llvm-svn: 54396

tracking down that this was breaking llvm-gcc bootstrap on Linux.

llvm-svn: 54394

instead of having it call getIterationCount again.

llvm-svn: 54380

looks bogus. Please see PR2629 for details on why this is breaking things.

llvm-svn: 54372

llvm-svn: 54266

CodeGen & Clang work coming next.

llvm-svn: 54161

partially unroll a loop when fully unrolling would not fit under the threshold.

Patch by Mikael Lepistö.

llvm-svn: 54160

llvm-svn: 54144

This fixes PR2599.

llvm-svn: 54133

llvm-svn: 54128