an incoming value from a block, the selector would evaluate the constant
at the TOP of the block instead of at the end of the block.  This made the
live range for the constant span the entire block, increasing register
pressure needlessly.

llvm-svn: 12542

llvm-svn: 12541

llvm-svn: 12540

llvm-svn: 12539

Otherwise, if you're in debugging mode, you get warnings for (apparently)
every immediate constant in the function during reg. allocation.

llvm-svn: 12538

rid of the funny cast.

llvm-svn: 12537

llvm-svn: 12534

llvm-svn: 12533

llvm-svn: 12532

This fixes the zlib linking problems.

llvm-svn: 12531

llvm-svn: 12530

llvm-svn: 12529

llvm-svn: 12526

llvm-svn: 12525

Contributed by Reid Spencer

llvm-svn: 12524

Contributed by Reid Spencer

llvm-svn: 12523

llvm-svn: 12522

llvm-svn: 12521

llvm-svn: 12520

#1 is to unconditionally strip constantpointerrefs out of
instruction operands where they are absolutely pointless and inhibit
optimization.  GRRR!

#2 is to implement InstCombine/getelementptr_const.ll

llvm-svn: 12519

llvm-svn: 12518

llvm-svn: 12517

Fixes PR303

llvm-svn: 12516

it was "reachable".  Cute.

llvm-svn: 12515

llvm-svn: 12510

llvm-svn: 12507

llvm-svn: 12506

llvm-svn: 12505

llvm-svn: 12504

llvm-svn: 12500

llvm-svn: 12496

extractor has extracted hundreds of loops from the SPEC benchmarks without crashing
and without misoptimizing the programs.

This testcase could be reduced substantially more by hand, but I don't have time
to work on it right now.

llvm-svn: 12495

folding load instructions into other instructions across free instruction
boundaries.  Perhaps this will also fix the other strange failures?

llvm-svn: 12494

With this fix we now successfully extract all 149 loops from 256.bzip2 without
crashing or miscompiling the program!

llvm-svn: 12493

llvm-svn: 12492

extracted all 63 loops for Olden/bh without crashing and without
miscompiling the program!!!

llvm-svn: 12491

exit nodes

llvm-svn: 12490

llvm-svn: 12489

llvm-svn: 12488

llvm-svn: 12487