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495 Commits

Author SHA1 Message Date
Jakob Stoklund Olesen fdc09941f2 Accept instructions that read undefined values. 
This is not supposed to happen, but I have seen the x86 rematter getting
confused when rematerializing partial redefs.

llvm-svn: 127857
 2011-03-18 03:06:04 +00:00
Jakob Stoklund Olesen 8630840c30 Dead code elimination may separate the live interval into multiple connected components. 
I have convinced myself that it can only happen when a phi value dies. When it
happens, allocate new virtual registers for the components.

llvm-svn: 127827
 2011-03-17 20:37:07 +00:00
Jakob Stoklund Olesen 557a82c099 Clarify debugging output. 
llvm-svn: 127771
 2011-03-16 22:56:08 +00:00
Jakob Stoklund Olesen c6cc485051 Make SpillIs an optional pointer. Avoid creating a bunch of temporary SmallVectors. 
llvm-svn: 127388
 2011-03-10 01:21:58 +00:00
Jakob Stoklund Olesen 71c380f6c7 Let shrinkToUses optionally return a list of now dead machine instructions. 
llvm-svn: 127192
 2011-03-07 23:29:10 +00:00
Jakob Stoklund Olesen ac32d8a691 Handle the special case of registers begin redefined by early-clobber defs. 
In this case, the value need to be available at the load index instead of the
normal use index.

llvm-svn: 127167
 2011-03-07 18:56:16 +00:00
Jakob Stoklund Olesen d58c8d12ab Fix PHI handling in LiveIntervals::shrinkToUses(). 
We need to wait until we meet a PHIDef in its defining block before resurrecting
PHIKills in the predecessors.

This should unbreak the llvm-gcc-build-x86_64-darwin10-x-mingw32-x-armeabi bot.

llvm-svn: 126905
 2011-03-03 00:20:51 +00:00
Nick Lewycky 68faa2dbbe Quiet a compiler warning about unused variable 'ExtVNI'. 
llvm-svn: 126815
 2011-03-02 01:43:30 +00:00
Jakob Stoklund Olesen f3c6e9211c Simplify LiveIntervals::shrinkToUses() a bit by using the new extendInBlock(). 
llvm-svn: 126806
 2011-03-02 00:33:03 +00:00
Jakob Stoklund Olesen 81eb18df34 Fix typo. 
llvm-svn: 126805
 2011-03-02 00:33:01 +00:00
Jakob Stoklund Olesen 1dd377d8c8 Move more fragments of spill weight calculation into CalcSpillWeights.h 
Simplify the spill weight calculation a bit by bypassing
getApproximateInstructionCount() and using LiveInterval::getSize() directly.
This changes the computed spill weights, but only by a constant factor in each
function. It should not affect how spill weights compare against each other, and
so it shouldn't affect code generation.

llvm-svn: 125530
 2011-02-14 23:15:38 +00:00
Jakob Stoklund Olesen b1b76adbd9 Move calcLiveBlockInfo() and the BlockInfo struct into SplitAnalysis. 
No functional changes intended.

llvm-svn: 125231
 2011-02-09 22:50:26 +00:00
Jakob Stoklund Olesen f2b16dc847 Add LiveIntervals::addKillFlags() to recompute kill flags after register allocation. 
This is a lot easier than trying to get kill flags right during live range
splitting and rematerialization.

llvm-svn: 125113
 2011-02-08 21:13:03 +00:00
Jakob Stoklund Olesen 55fc1d0b3e Add LiveIntervals::shrinkToUses(). 
After uses of a live range are removed, recompute the live range to only cover
the remaining uses. This is necessary after rematerializing the value before
some (but not all) uses.

llvm-svn: 125058
 2011-02-08 00:03:05 +00:00
Jakob Stoklund Olesen e8ac8e93a1 Apparently, it is possible for a block with a landing pad successor to have no calls. 
In that case we simply ignore the landing pad and split live ranges before the
first terminator.

llvm-svn: 124907
 2011-02-04 23:11:13 +00:00
Jakob Stoklund Olesen 096bd8837f Add LiveIntervals::getLastSplitPoint(). 
A live range cannot be split everywhere in a basic block. A split must go before
the first terminator, and if the variable is live into a landing pad, the split
must happen before the call that can throw.

llvm-svn: 124894
 2011-02-04 19:33:11 +00:00
Jakob Stoklund Olesen 2fb5b31578 Simplify a bunch of isVirtualRegister() and isPhysicalRegister() logic. 
These functions not longer assert when passed 0, but simply return false instead.

No functional change intended.

llvm-svn: 123155
 2011-01-10 02:58:51 +00:00
Jakob Stoklund Olesen 1331a15b0c Replace TargetRegisterInfo::printReg with a PrintReg class that also works without a TRI instance. 
Print virtual registers numbered from 0 instead of the arbitrary
FirstVirtualRegister. The first virtual register is printed as %vreg0.
TRI::NoRegister is printed as %noreg.

llvm-svn: 123107
 2011-01-09 03:05:53 +00:00
Jakob Stoklund Olesen 9beef41f2c Fix emergency spilling in LiveIntervals::spillPhysRegAroundRegDefsUses. 
Always spill the full representative register at any point where any subregister
is live.

This fixes PR8620 which caused the old logic to get confused and not spill
anything at all.

The fundamental problem here is that the coalescer is too aggressive about
physical register coalescing. It sometimes makes it impossible to allocate
registers without these emergency spills.

llvm-svn: 119375
 2010-11-16 19:55:14 +00:00
Jakob Stoklund Olesen e2b8858611 Fix PR8612 in the standard spiller, take two. 
The live range of a register defined by an early clobber starts at the use slot,
not the def slot.

Except when it is an early clobber tied to a use operand. Then it starts at the
def slot like a standard def.

llvm-svn: 119305
 2010-11-16 00:40:59 +00:00
Jakob Stoklund Olesen 97154f67d9 Revert "Fix PR8612 in the standard spiller as well." 
This reverts r119183 which borke the buildbots.

llvm-svn: 119270
 2010-11-15 21:51:51 +00:00
Jakob Stoklund Olesen 97825bcbfd Fix PR8612 in the standard spiller as well. 
The live range of a register defined by an early clobber starts at the use slot,
not the def slot.

llvm-svn: 119183
 2010-11-15 20:55:53 +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
Jakob Stoklund Olesen b7050233fb Teach MachineBasicBlock::print() to annotate instructions and blocks with 
SlotIndexes when available.

llvm-svn: 117392
 2010-10-26 20:21:46 +00:00
Owen Anderson 8ac477ffb5 Begin adding static dependence information to passes, which will allow us to 
perform initialization without static constructors AND without explicit initialization
by the client.  For the moment, passes are required to initialize both their
(potential) dependencies and any passes they preserve.  I hope to be able to relax
the latter requirement in the future.

llvm-svn: 116334
 2010-10-12 19:48:12 +00:00