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

before/after effects of a pass, crazy!

llvm-svn: 55230

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

In particular, Collector was confusing to implementors. Several
thought that this compile-time class was the place to implement
their runtime GC heap. Of course, it doesn't even exist at runtime.
Specifically, the renames are:

  Collector               -> GCStrategy
  CollectorMetadata       -> GCFunctionInfo
  CollectorModuleMetadata -> GCModuleInfo
  CollectorRegistry       -> GCRegistry
  Function::getCollector  -> getGC (setGC, hasGC, clearGC)

Several accessors and nested types have also been renamed to be
consistent. These changes should be obvious.

llvm-svn: 54899

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

returning an std::string by value, it fills in a SmallString/SmallVector
passed in.  This significantly reduces string thrashing in some cases.

More specifically, this:
 - Adds an operator<< and a print method for APInt that allows you to 
   directly send them to an ostream.
 - Reimplements APInt::toString to be much simpler and more efficient
   algorithmically in addition to not thrashing strings quite as much.

This speeds up llvm-dis on kc++ by 7%, and may also slightly speed up the
asmprinter.  This also fixes a bug I introduced into the asmwriter in a
previous patch w.r.t. alias printing.

llvm-svn: 54873

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

invalidating the iterator by deleting the current use. This fixes a segfault on
64 bit linux reported in PR2675.

Also remove an unneeded if.

llvm-svn: 54778

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

llvm-svn: 54707

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

postfixing it with a number.

llvm-svn: 54468

r53941 (but this was not noticed due to the lack of a basic test for
SRETPromotion). 

llvm-svn: 54467

llvm-svn: 54464

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