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Author SHA1 Message Date
Lang Hames 05fb9637f6 The Indexes Patch. 
This introduces a new pass, SlotIndexes, which is responsible for numbering
instructions for register allocation (and other clients). SlotIndexes numbering
is designed to match the existing scheme, so this patch should not cause any
changes in the generated code.

For consistency, and to avoid naming confusion, LiveIndex has been renamed
SlotIndex.

The processImplicitDefs method of the LiveIntervals analysis has been moved
into its own pass so that it can be run prior to SlotIndexes. This was
necessary to match the existing numbering scheme.

llvm-svn: 85979
 2009-11-03 23:52:08 +00:00
Chris Lattner 1362602eb2 Change Pass::print to take a raw ostream instead of std::ostream, 
update all code that this affects.

llvm-svn: 79830
 2009-08-23 06:03:38 +00:00
Chris Lattner d99f1c6fa2 shoot a few more std::ostream print methods in the head. 
llvm-svn: 79814
 2009-08-23 03:47:42 +00:00
Lang Hames fc968ef687 Update to in-place spilling framework. Includes live interval scaling and trivial rewriter. 
llvm-svn: 72729
 2009-06-02 16:53:25 +00:00
Evan Cheng 210fc62a91 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
 2009-05-03 18:32:42 +00:00
Evan Cheng bab5988017 Livestacks really does preserve everything. 
llvm-svn: 56476
 2008-09-22 22:26:15 +00:00
Evan Cheng 962c2cf17a Instead of setPreservesAll, just mark them preseving machine loop info and machine dominators. 
llvm-svn: 56475
 2008-09-22 22:21:38 +00:00
Evan Cheng 168f8f3916 Mark several codegen passes as preserving all analysis. 
llvm-svn: 56469
 2008-09-22 20:58:04 +00:00
Evan Cheng 12a0222a01 Add a stack slot coloring pass. Not yet enabled. 
llvm-svn: 51934
 2008-06-04 09:18:41 +00:00