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11 Commits

Author SHA1 Message Date
Andrew Trick fce64c938a Coding style. No significant functionality. Abandon linear scan style 
in favor of the widespread llvm style. Capitalize variables and add
newlines for visual parsing. Rename variables for readability.
And other cleanup.

llvm-svn: 120490
 2010-11-30 23:18:47 +00:00
Andrew Trick f11344d770 Check TRI->getReservedRegs because other allocators do it. Even though 
it makes no sense for allocation_order iterators to visit reserved regs.
The inline spiller depends on AliasAnalysis.
Manage the Query state to avoid uninitialized or stale results.

llvm-svn: 118800
 2010-11-11 17:46:29 +00:00
Andrew Trick 89eb6a8b94 RABasic is nearly functionally complete. There are a few remaining 
benchmarks hitting an assertion.
Adds LiveIntervalUnion::collectInterferingVRegs.
Fixes "late spilling" by checking for any unspillable live vregs among
all physReg aliases.

llvm-svn: 118701
 2010-11-10 19:18:47 +00:00
Andrew Trick 488660554e Adds RABasic verification and tracing. 
(retry now that the windows build is green)

llvm-svn: 118630
 2010-11-09 21:04:34 +00:00
Matt Beaumont-Gay 7c1fddb531 Add a trivial virtual dtor to AbstractRegisterDescription to appease 
-Wnon-virtual-dtor.

llvm-svn: 118616
 2010-11-09 19:56:25 +00:00
Andrew Trick 42d50e920b Reverting r118604. Windows build broke. 
llvm-svn: 118613
 2010-11-09 19:47:51 +00:00
Andrew Trick 85064c17be Adds RABasic verification and tracing. 
llvm-svn: 118604
 2010-11-09 19:01:17 +00:00
Andrew Trick 3528465232 Adds support for spilling previously allocated live intervals to 
handle cases in which a register is unavailable for spill code.
Adds LiveIntervalUnion::extract. While processing interferences on a
live virtual register, reuses the same Query object for each
physcial reg.

llvm-svn: 118423
 2010-11-08 18:02:08 +00:00
Andrew Trick 5f88cc34e1 Remove the vector of live vregs. I thought we would need to track 
them, but hopefully we won't. And this is not the right data structure
to do it anyway.

llvm-svn: 117412
 2010-10-26 22:58:24 +00:00
Andrew Trick 84aef49e32 Jakob's review of the basic register allocator. 
llvm-svn: 117384
 2010-10-26 18:34:01 +00:00
Andrew Trick 1c24605a57 This is a prototype of an experimental register allocation 
framework. It's purpose is not to improve register allocation per se,
but to make it easier to develop powerful live range splitting. I call
it the basic allocator because it is as simple as a global allocator
can be but provides the building blocks for sophisticated register
allocation with live range splitting. 

A minimal implementation is provided that trivially spills whenever it
runs out of registers. I'm checking in now to get high-level design
and style feedback. I've only done minimal testing. The next step is
implementing a "greedy" allocation algorithm that does some register
reassignment and makes better splitting decisions.

llvm-svn: 117174
 2010-10-22 23:09:15 +00:00