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18 Commits

Author SHA1 Message Date
Chandler Carruth 1b9dde087e [Modules] Remove potential ODR violations by sinking the DEBUG_TYPE 
define below all header includes in the lib/CodeGen/... tree. While the
current modules implementation doesn't check for this kind of ODR
violation yet, it is likely to grow support for it in the future. It
also removes one layer of macro pollution across all the included
headers.

Other sub-trees will follow.

llvm-svn: 206837
 2014-04-22 02:02:50 +00:00
Craig Topper c0196b1b40 [C++11] More 'nullptr' conversion. In some cases just using a boolean check instead of comparing to nullptr. 
llvm-svn: 206142
 2014-04-14 00:51:57 +00:00
Owen Anderson b36376efcb Switch a number of loops in lib/CodeGen over to range-based for-loops, now that 
the MachineRegisterInfo iterators are compatible with it.

llvm-svn: 204075
 2014-03-17 19:36:09 +00:00
Owen Anderson 16c6bf49b7 Phase 2 of the great MachineRegisterInfo cleanup. This time, we're changing 
operator* on the by-operand iterators to return a MachineOperand& rather than
a MachineInstr&.  At this point they almost behave like normal iterators!

Again, this requires making some existing loops more verbose, but should pave
the way for the big range-based for-loop cleanups in the future.

llvm-svn: 203865
 2014-03-13 23:12:04 +00:00
Benjamin Kramer d6f1f84f51 [C++11] Replace llvm::tie with std::tie. 
The old implementation is no longer needed in C++11.

llvm-svn: 202644
 2014-03-02 13:30:33 +00:00
Matthias Braun 2d5c32b3b5 Work on LiveRange instead of LiveInterval where possible 
Also change some pointer arguments to references at some places where
0-pointers are not allowed.

llvm-svn: 192396
 2013-10-10 21:28:57 +00:00
Matthias Braun 13ddb7cd65 Rename LiveRange to LiveInterval::Segment 
The Segment struct contains a single interval; multiple instances of this struct
are used to construct a live range, but the struct is not a live range by
itself.

llvm-svn: 192392
 2013-10-10 21:28:43 +00:00
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