variables.

llvm-svn: 12193

* Removing extraneous empty space and empty comment lines

llvm-svn: 12014

llvm-svn: 11919

multiple type names for the same structural type.  Make DTE eliminate all
but one of the type names

llvm-svn: 11879

assume that if they don't intend to write to a global variable, that they
would mark it as constant.  However, there are people that don't understand
that the compiler can do nice things for them if they give it the information
it needs.

This pass looks for blatently obvious globals that are only ever read from.
Though it uses a trivially simple "alias analysis" of sorts, it is still able
to do amazing things to important benchmarks.  253.perlbmk, for example,
contains several ***GIANT*** function pointer tables that are not marked
constant and should be.  Marking them constant allows the optimizer to turn
a whole bunch of indirect calls into direct calls.  Note that only a link-time
optimizer can do this transformation, but perlbmk does have several strings
and other minor globals that can be marked constant by this pass when run
from GCCAS.

176.gcc has a ton of strings and large tables that are marked constant, both
at compile time (38 of them) and at link time (48 more).  Other benchmarks
give similar results, though it seems like big ones have disproportionally
more than small ones.

This pass is extremely quick and does good things.  I'm going to enable it
in gccas & gccld.  Not bad for 50 SLOC.

llvm-svn: 11836

llvm-svn: 11383

llvm-svn: 11229

llvm-svn: 11228

llvm-svn: 11224

llvm-svn: 11202

llvm-svn: 11200

llvm-svn: 11199

llvm-svn: 11111

(I just love typing haX0r.   haX0r haX0r haX0r.)

llvm-svn: 11079

llvm-svn: 10726

we converge

llvm-svn: 10618

llvm-svn: 10586

llvm-svn: 10305

llvm-svn: 10164

llvm-svn: 10163

would have caught this.  *sigh*

llvm-svn: 10142

llvm-svn: 10138

llvm-svn: 10137

* Make the cost metric for passing constants in as arguments to functions MUCH
  more accurate, by actually estimating the amount of code that will be constant
  propagated away.

llvm-svn: 10136

Print out the costs for functions that AREN'T inlined as well

llvm-svn: 10135

* Implement FuncResolve/2003-11-20-BogusResolveWarning.ll
   ... which eliminates a large number of annoying warnings.  I know misha
   will miss them though!

llvm-svn: 10123

llvm-svn: 10111

and pages of non-symbolic types.

llvm-svn: 10109

llvm-svn: 10055

llvm-svn: 9903

pool allocator no end of trouble, and doesn't make a lot of sense anyway.  This
does not solve the problem with mutually recursive functions, but they are much less common.

llvm-svn: 9828

llvm-svn: 9827

llvm-svn: 9752

of intrinsic functions, causing the verifier to fail.

llvm-svn: 9745

llvm-svn: 9741

llvm-svn: 9648

functions.  GRR

llvm-svn: 9641

llvm-svn: 9579

llvm-svn: 9572

do something dumb, and inefficient, but more complete.

llvm-svn: 9542