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11 Commits

Author SHA1 Message Date
Jakob Stoklund Olesen b389271101 Copy single reaching defs directly into the LiveInterval. 
When findReachingDefs() finds that only one value can reach the basic
block, just copy the work list of visited blocks directly into the live
interval.

Sort the block list and use a LiveRangeUpdater to make the bulk add
fast.

When multiple reaching defs are found, transfer the work list to the
updateSSA() work list as before. Also use LiveRangeUpdater in
updateLiveIns() following updateSSA().

This makes live interval analysis more than 3x faster on one huge test
case.

llvm-svn: 175685
 2013-02-20 23:08:26 +00:00
Jakob Stoklund Olesen 4aed470376 Clear kill flags while computing live ranges. 
Kill flags are difficult to maintain, and liveness queries are better
handled by live intervals.

Kill flags are reinserted after register allocation by addKillFlags().

llvm-svn: 163334
 2012-09-06 18:15:15 +00:00
Jakob Stoklund Olesen 97e14e02f1 Eliminate the IS_PHI_DEF flag and VNInfo::setIsPHIDef(). 
A value number is a PHI def if and only if it begins at a block
boundary. This can be derived from the def slot, a separate flag is not
necessary.

llvm-svn: 160893
 2012-07-27 21:11:14 +00:00
Jakob Stoklund Olesen 3d604ab933 Be more verbose when detecting dominance problems. 
Catch uses of undefined physregs that haven't been added to basic block
live-in lists. Run the verifier to pinpoint the problem.

Also run the verifier when a virtual register use is not jointly
dominated by defs.

llvm-svn: 160207
 2012-07-13 23:39:05 +00:00
Jakob Stoklund Olesen 989b3b1516 Implement LiveRangeCalc::extendToUses() and createDeadDefs(). 
These LiveRangeCalc methods are to be used when computing a live range
from scratch.

llvm-svn: 158027
 2012-06-05 21:54:09 +00:00
Jakob Stoklund Olesen 5ef0e0b262 Pass context pointers to LiveRangeCalc::reset(). 
Remove the same pointers from all the other LiveRangeCalc functions,
simplifying the interface.

llvm-svn: 157941
 2012-06-04 18:21:16 +00:00
Jakob Stoklund Olesen ad6b22eb16 Don't store COPY pointers in VNInfo. 
If a value is defined by a COPY, that instuction can easily and cheaply
be found by getInstructionFromIndex(VNI->def).

This reduces the size of VNInfo from 24 to 16 bytes, and improves
llc compile time by 3%.

llvm-svn: 149763
 2012-02-04 05:20:49 +00:00
Lang Hames 6cee53d06e Fix assert condition. 
llvm-svn: 146987
 2011-12-20 20:23:40 +00:00
Jakob Stoklund Olesen 0494c5c35d Switch extendInBlock() to take a kill slot instead of the last use slot. 
Three out of four clients prefer this interface which is consistent with
extendIntervalEndTo() and LiveRangeCalc::extend().

llvm-svn: 139604
 2011-09-13 16:47:56 +00:00
NAKAMURA Takumi cac923b556 Unbreak msvc. 
llvm-svn: 139581
 2011-09-13 03:58:34 +00:00
Jakob Stoklund Olesen 487f2a37bf Extract live range calculations from SplitKit. 
SplitKit will soon need two copies of these data structures, and the
algorithms will also be useful when LiveIntervalAnalysis becomes
independent of LiveVariables.

llvm-svn: 139572
 2011-09-13 01:34:21 +00:00