ThreadEdge directly.  This shares the code, but is just a refactoring.
* Make JumpThreading compute the set of loop headers and avoid threading
  across them.  This prevents jump threading from forming irreducible 
  loops (goodness) but also prevents it from threading in other cases that
  are beneficial (see the comment above FindFunctionBackedges).

llvm-svn: 70820

FindFunctionBackedges function.

llvm-svn: 70819

llvm-svn: 70818

llvm-svn: 70817

llvm-svn: 70816

The stack slots which share the same stack slot after coloring can, but do not have to, use the same register. In fact, they each may have different register class requirements.

llvm-svn: 70815

llvm-svn: 70814

llvm-svn: 70813

llvm-svn: 70812

llvm-svn: 70811

llvm-svn: 70810

llvm-svn: 70809

llvm-svn: 70808

 - The diagnostic is still poor, however. Doug, can you investigate?

 - Improved the test case to not depend on the file name, now it can
   be extended to actually check the formatting of the diagnostics
   (I'm hoping grep -A is portable here).

llvm-svn: 70807

stdint.h unless we are freestanding.

Any suggestions here are welcome.

llvm-svn: 70806

extension warning.

llvm-svn: 70805

llvm-svn: 70804

-Depend on DebugLocs for source line info.

llvm-svn: 70803

llvm-svn: 70800

llvm-svn: 70799

ivar layout.
 - The layout needs access to synthesized ivars.

llvm-svn: 70798

llvm-svn: 70797

llvm-svn: 70796

llvm-svn: 70795

llvm-svn: 70794

pasted token.

llvm-svn: 70793

llvm-svn: 70792

llvm-svn: 70791

is the empty set. :)  Thanks to Fritz for pointing this out.

llvm-svn: 70790

llvm-svn: 70789

throw exceptions.

llvm-svn: 70788

In some rare cases, the register allocator can spill registers but end up not utilizing registers at all. The fundamental problem is linearscan's backtracking can end up freeing more than one allocated registers. However,  reloads and restores might be folded into uses / defs and freed registers might not be used at all.

VirtRegMap keeps track of allocations so it knows what's not used. As a horrible hack, the stack coloring can color spill slots with *free* registers. That is, it replace reload and spills with copies from and to the free register. It unfold instructions that load and store the spill slot and replace them with register using variants.

Not yet enabled. This is part 1. More coming.

llvm-svn: 70787

llvm-svn: 70786

llvm-svn: 70785

in C++. Fixes <rdar://problem/6815995>.

llvm-svn: 70784

llvm-svn: 70783

Thanks for Dan Gohman for suggestion!

llvm-svn: 70782

printing. Also, when we only need to truncate the line at the end,
make sure there is room for the ellipsis.

llvm-svn: 70781

llvm-svn: 70780

just computing it!

llvm-svn: 70779