Evan Cheng
1de5cf548e
Typo.
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llvm-svn: 70792
2009-05-03 19:10:11 +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.
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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
Owen Anderson
5c53a46297
Enable stack slot coloring DCE. Evan's spiller fixes were needed before this could happen.
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llvm-svn: 65501
2009-02-26 04:47:57 +00:00
Owen Anderson
0fb12efbc1
Add a debugging option for SSC DCE.
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llvm-svn: 65375
2009-02-24 05:44:18 +00:00
Owen Anderson
81db491b7f
Add a quick pass to the stack slot colorer to eliminate some trivially redundant spills after coloring.
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Ideally these would never get created in the first place, but until we enhance the spiller to have a more
global picture of what's happening, this is necessary for code quality in some circumstances.
llvm-svn: 65120
2009-02-20 09:11:36 +00:00
Dan Gohman
9bb56443a1
Teach StackSlotColoring to update MachineMemOperands when
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changing the stack slots on an instruction, to keep them
consistent with the actual memory addresses.
llvm-svn: 60584
2008-12-05 05:31:14 +00:00
Dan Gohman
4459c4250d
Adjust whitespace in debug messages to be more consistent
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with other debug messages.
llvm-svn: 57543
2008-10-15 02:57:38 +00:00
Dan Gohman
0d1e9a8e04
Switch the MachineOperand accessors back to the short names like
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isReg, etc., from isRegister, etc.
llvm-svn: 57006
2008-10-03 15:45:36 +00:00
Evan Cheng
962c2cf17a
Instead of setPreservesAll, just mark them preseving machine loop info and machine dominators.
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llvm-svn: 56475
2008-09-22 22:21:38 +00:00
Evan Cheng
168f8f3916
Mark several codegen passes as preserving all analysis.
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llvm-svn: 56469
2008-09-22 20:58:04 +00:00
Dan Gohman
a79db30d28
Tidy up several unbeseeming casts from pointer to intptr_t.
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llvm-svn: 55779
2008-09-04 17:05:41 +00:00
Dan Gohman
7ce10037c4
Make stack slot coloring's debug output more consistent with
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other passes.
llvm-svn: 53415
2008-07-10 19:49:32 +00:00
Evan Cheng
71013f8c78
Remove option used to debug stack coloring bugs. It's no longer needed since stack coloring is now bug free.
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llvm-svn: 52644
2008-06-23 21:24:32 +00:00
Evan Cheng
c72dcd103c
Instead of adding an isSS field to LiveInterval to denote stack slot. Use top bit of 'reg' instead. If the top bit is set, than the LiveInterval represents a stack slot live interval.
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llvm-svn: 52639
2008-06-23 21:03:19 +00:00
Evan Cheng
12a0222a01
Add a stack slot coloring pass. Not yet enabled.
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llvm-svn: 51934
2008-06-04 09:18:41 +00:00
