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

llvm-svn: 70778

llvm-svn: 70777

llvm-svn: 70776

Lift up a size calculation and note some asymmetries.

llvm-svn: 70775

llvm-svn: 70774

llvm-svn: 70773

llvm-svn: 70772

llvm-svn: 70771

llvm-svn: 70770

llvm-svn: 70769

llvm-svn: 70768

llvm-svn: 70767

Temporary disable imm patterns for cmp. Actually, all cmp-related stuff (select_cc, setcc, br_cc). needs to be rethought

llvm-svn: 70766

llvm-svn: 70765

llvm-svn: 70764

llvm-svn: 70763

llvm-svn: 70762

llvm-svn: 70761

llvm-svn: 70760

llvm-svn: 70759

llvm-svn: 70758

llvm-svn: 70757

struct.
 - We still need to do more lookup than necessary because ivars don't
   live in a reasonable DeclContext.

 - The only remaining client of the interface shadow struct is the
   ivar layout bitmap.

llvm-svn: 70756

llvm-svn: 70755

llvm-svn: 70754

llvm-svn: 70753

llvm-svn: 70752

llvm-svn: 70751

llvm-svn: 70750