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Commit Graph

712 Commits

Author SHA1 Message Date
Jakob Stoklund Olesen
722c9a7925 Fix assertions in updateRegMaskSlots().
The RegMaskSlots contains 'r' slots while NewIdx and OldIdx are 'B'
slots. This broke the checks in the assertions.

This fixes PR14302.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@167625 91177308-0d34-0410-b5e6-96231b3b80d8
2012-11-09 19:18:49 +00:00
Andrew Trick
27c28cef11 misched: Added handleMove support for updating all kill flags, not just for allocatable regs.
This is a medium term workaround until we have a more robust solution
in the form of a register liveness utility for postRA passes.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@166001 91177308-0d34-0410-b5e6-96231b3b80d8
2012-10-16 00:22:51 +00:00
Jakob Stoklund Olesen
790047620a Remove LIS::isAllocatable() and isReserved() helpers.
All callers can simply use the corresponding MRI functions.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@165985 91177308-0d34-0410-b5e6-96231b3b80d8
2012-10-15 22:14:34 +00:00
Jakob Stoklund Olesen
af89690760 Allow for loops in LiveIntervals::pruneValue().
It is possible that the live range of the value being pruned loops back
into the kill MBB where the search started. When that happens, make sure
that the beginning of KillMBB is also pruned.

Instead of starting a DFS at KillMBB and skipping the root of the
search, start a DFS at each KillMBB successor, and allow the search to
loop back to KillMBB.

This fixes PR14078.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@165872 91177308-0d34-0410-b5e6-96231b3b80d8
2012-10-13 16:15:31 +00:00
Jakob Stoklund Olesen
ad5e969ba9 Use a transposed algorithm for handleMove().
Completely update one interval at a time instead of collecting live
range fragments to be updated. This avoids building data structures,
except for a single SmallPtrSet of updated intervals.

Also share code between handleMove() and handleMoveIntoBundle().

Add support for moving dead defs across other live values in the
interval. The MI scheduler can do that.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@165824 91177308-0d34-0410-b5e6-96231b3b80d8
2012-10-12 21:31:57 +00:00
Jakob Stoklund Olesen
d4919a988d Handle reserved registers more accurately in handleMove().
Reserved register live ranges look like a set of dead defs - any uses of
reserved registers are ignored.

Instead of skipping the updating of reserved register operands entirely,
just ignore the use operands and treat the def operands normally.

No test case, handleMove() is not commonly used yet.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@165060 91177308-0d34-0410-b5e6-96231b3b80d8
2012-10-02 22:08:36 +00:00
Jakob Stoklund Olesen
2df8ac84ae Extend -new-coalescer SSA update to handle mapped values as well.
The old-fashioned many-to-one value mapping doesn't always work when
merging vector lanes. A value can map to multiple different values, and
it can even be necessary to insert new PHIs.

When a value number is defined by a copy from a value number that
required SSa update, include the live range of the copied value number
in the SSA update as well. It is not necessarily a copy of the original
value number any longer.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@164329 91177308-0d34-0410-b5e6-96231b3b80d8
2012-09-20 23:08:39 +00:00
Jakob Stoklund Olesen
87f7864c6d Merge into undefined lanes under -new-coalescer.
Add LIS::pruneValue() and extendToIndices(). These two functions are
used by the register coalescer when merging two live ranges requires
more than a trivial value mapping as supported by LiveInterval::join().

The pruneValue() function can remove the part of a value number that is
going to conflict in join(). Afterwards, extendToIndices can restore the
live range, using any new dominating value numbers and updating the SSA
form.

Use this complex value mapping to support merging a register into a
vector lane that has a conflicting value, but the clobbered lane is
undef.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@164074 91177308-0d34-0410-b5e6-96231b3b80d8
2012-09-17 23:03:25 +00:00
Lang Hames
6d742cc61e Make findLastUseBefore handle reg-unit liveness.
findLastUseBefore was previous considering virtreg liveness only, leading to
incorrect live intervals for reg units when instrs with physreg operands were
moved up.
 


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@163685 91177308-0d34-0410-b5e6-96231b3b80d8
2012-09-12 06:56:16 +00:00
Manman Ren
b720be6a50 Release build: guard dump functions with
"#if !defined(NDEBUG) || defined(LLVM_ENABLE_DUMP)"

No functional change. Update r163339.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@163653 91177308-0d34-0410-b5e6-96231b3b80d8
2012-09-11 22:23:19 +00:00
Dmitri Gribenko
2de0572cae Remove redundant semicolons which are null statements.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@163547 91177308-0d34-0410-b5e6-96231b3b80d8
2012-09-10 21:26:47 +00:00
Manman Ren
77e300e8f0 Release build: guard dump functions with "ifndef NDEBUG"
No functional change.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@163339 91177308-0d34-0410-b5e6-96231b3b80d8
2012-09-06 19:06:06 +00:00
Jakob Stoklund Olesen
e617ccb80d Handle overlapping regunit intervals in LiveIntervals::addKillFlags().
We will soon allow virtual register live ranges to overlap regunit live
ranges when the physreg is defined as a copy of the virtreg:

  %EAX = COPY %vreg5
  FOO %vreg5
  BAR %EAX<kill>

There is no real interference since %vreg5 and %EAX have the same value
where they overlap.

This patch prevents addKillFlags from adding virtreg kill flags to FOO
where the assigned physreg is overlapping the virtual register live
range.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@163335 91177308-0d34-0410-b5e6-96231b3b80d8
2012-09-06 18:15:18 +00:00
Lang Hames
7b23d08385 When updating live range endpoints, make sure to preserve the early clobber bit.
Fixs PR13719.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@163107 91177308-0d34-0410-b5e6-96231b3b80d8
2012-09-03 06:31:45 +00:00
David Blaikie
986d76d7b3 Tidy up a few more uses of MF.getFunction()->getName().
Based on CR feedback from r162301 and Craig Topper's refactoring in r162347
here are a few other places that could use the same API (& in one instance drop
a Function.h dependency).

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@162367 91177308-0d34-0410-b5e6-96231b3b80d8
2012-08-22 17:18:53 +00:00
Jakob Stoklund Olesen
dcc4436cdd Add an experimental -early-live-intervals option.
This option runs LiveIntervals before TwoAddressInstructionPass which
will eventually learn to exploit and update the analysis.

Eventually, LiveIntervals will run before PHIElimination, and we can get
rid of LiveVariables.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@161270 91177308-0d34-0410-b5e6-96231b3b80d8
2012-08-03 22:12:54 +00:00
Jakob Stoklund Olesen
b2beac2b96 Completely eliminate VNInfo flags.
The 'unused' state of a value number can be represented as an invalid
def SlotIndex. This also exposed code that shouldn't have been looking
at unused value VNInfos.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@161258 91177308-0d34-0410-b5e6-96231b3b80d8
2012-08-03 20:59:32 +00:00
Jakob Stoklund Olesen
bf60aa9db5 Eliminate the VNInfo::hasPHIKill() flag.
The only real user of the flag was removeCopyByCommutingDef(), and it
has been switched to LiveIntervals::hasPHIKill().

All the code changed by this patch was only concerned with computing and
propagating the flag.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@161255 91177308-0d34-0410-b5e6-96231b3b80d8
2012-08-03 20:19:44 +00:00
Jakob Stoklund Olesen
0ab7103e06 Make the hasPHIKills flag a computed property.
The VNInfo::HAS_PHI_KILL is only half supported. We precompute it in
LiveIntervalAnalysis, but it isn't properly updated by live range
splitting and functions like shrinkToUses().

It is only used in one place: RegisterCoalescer::removeCopyByCommutingDef().

This patch changes that function to use a new LiveIntervals::hasPHIKill()
function that computes the flag for a given value number.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@161254 91177308-0d34-0410-b5e6-96231b3b80d8
2012-08-03 20:10:24 +00:00
Jakob Stoklund Olesen
c16bf79303 Also compute register mask lists under -new-live-intervals.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@160898 91177308-0d34-0410-b5e6-96231b3b80d8
2012-07-27 21:56:39 +00:00
Jakob Stoklund Olesen
b18d779b35 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.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@160893 91177308-0d34-0410-b5e6-96231b3b80d8
2012-07-27 21:11:14 +00:00
Jakob Stoklund Olesen
3dfa38a5bf Add a -new-live-intervals experimental option.
This option replaces the existing live interval computation with one
based on LiveRangeCalc.cpp. The new algorithm does not depend on
LiveVariables, and it can be run at any time, before or after leaving
SSA form.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@160892 91177308-0d34-0410-b5e6-96231b3b80d8
2012-07-27 20:58:46 +00:00
Jakob Stoklund Olesen
bfd752f310 Delete a boring statistic.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@159030 91177308-0d34-0410-b5e6-96231b3b80d8
2012-06-22 20:40:15 +00:00
Jakob Stoklund Olesen
7fa6784296 Store live intervals in an IndexedMap.
It is both smaller and faster than DenseMap.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@159029 91177308-0d34-0410-b5e6-96231b3b80d8
2012-06-22 20:37:52 +00:00
Jakob Stoklund Olesen
e024874d22 Simplify handleMove() a bit.
There is no need to check for physreg live ranges. They don't exist any
more.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@159019 91177308-0d34-0410-b5e6-96231b3b80d8
2012-06-22 18:38:57 +00:00
Jakob Stoklund Olesen
27b7669a60 Stop computing physreg live ranges.
Everyone is using on-demand regunit ranges now.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@159018 91177308-0d34-0410-b5e6-96231b3b80d8
2012-06-22 18:20:50 +00:00
Jakob Stoklund Olesen
241d0209a7 Remove LiveIntervals::trackingRegUnits().
With regunit liveness permanently enabled, this function would always
return true.

Also remove now obsolete code for checking physreg interference.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@159006 91177308-0d34-0410-b5e6-96231b3b80d8
2012-06-22 16:46:44 +00:00
Jakob Stoklund Olesen
c4118452bc Remove the -live-regunits command line option.
Register allocators depend on it being permanently enabled now.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@158873 91177308-0d34-0410-b5e6-96231b3b80d8
2012-06-20 23:31:34 +00:00
Jakob Stoklund Olesen
12a7be9ba4 Fix some more LiveInterval enumerations.
Deterministically enumerate the virtual registers instead.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@158872 91177308-0d34-0410-b5e6-96231b3b80d8
2012-06-20 23:23:59 +00:00
Jakob Stoklund Olesen
797e9a7737 Enable register unit liveness by default.
Soon we won't need to compute live intervals for physical registers.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@158865 91177308-0d34-0410-b5e6-96231b3b80d8
2012-06-20 22:52:22 +00:00
Jakob Stoklund Olesen
7824152557 Only update regunit live ranges that have been precomputed.
Regunit live ranges are computed on demand, so when mi-sched calls
handleMove, some regunits may not have live ranges yet.

That makes updating them easier: Just skip the non-existing ranges. They
will be computed correctly from the rescheduled machine code when they
are needed.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@158831 91177308-0d34-0410-b5e6-96231b3b80d8
2012-06-20 18:00:57 +00:00
Jakob Stoklund Olesen
2769e93384 Delete dead code.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@158827 91177308-0d34-0410-b5e6-96231b3b80d8
2012-06-20 16:38:50 +00:00
Jakob Stoklund Olesen
bf833f0747 Add regunit liveness support to LiveIntervals::handleMove().
When LiveIntervals is tracking fixed interference in regunits, make sure
to update those intervals as well. Currently guarded by -live-regunits.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@158766 91177308-0d34-0410-b5e6-96231b3b80d8
2012-06-19 23:50:18 +00:00
Jakob Stoklund Olesen
fa8becb6f9 80 col.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@158755 91177308-0d34-0410-b5e6-96231b3b80d8
2012-06-19 22:50:53 +00:00
Jakob Stoklund Olesen
461e7eaa6f Remove dead debug option -disable-rematerialization.
Remat has been stable for years, and it isn't done by
LiveIntervalAnalysis any longer. (See LiveRangeEdit).

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@158079 91177308-0d34-0410-b5e6-96231b3b80d8
2012-06-06 16:22:41 +00:00
Matt Beaumont-Gay
05b46f05c3 Suppress -Wunused-variable in -Asserts build
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@158037 91177308-0d34-0410-b5e6-96231b3b80d8
2012-06-05 23:00:03 +00:00
Jakob Stoklund Olesen
b77ec7d264 Simplify LiveInterval::print().
Don't print out the register number and spill weight, making the TRI
argument unnecessary.

This allows callers to interpret the reg field. It can currently be a
virtual register, a physical register, a spill slot, or a register unit.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@158031 91177308-0d34-0410-b5e6-96231b3b80d8
2012-06-05 22:51:54 +00:00
Jakob Stoklund Olesen
34c6f98034 Add experimental support for register unit liveness.
Instead of computing a live interval per physreg, LiveIntervals can
compute live intervals per register unit. This makes impossible the
confusing situation where aliasing registers could have overlapping live
intervals. It should also make fixed interferernce checking cheaper
since registers have fewer register units than aliases.

Live intervals for regunits are computed on demand, using MRI use-def
chains and the new LiveRangeCalc class. Only regunits live in to ABI
blocks are precomputed during LiveIntervals::runOnMachineFunction().

The regunit liveness computations don't depend on LiveVariables.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@158029 91177308-0d34-0410-b5e6-96231b3b80d8
2012-06-05 22:02:15 +00:00
Jakob Stoklund Olesen
afb32f7fb4 Remove the last remat-related code from LiveIntervalAnalysis.
Rematerialization is handled by LiveRangeEdit now.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@157974 91177308-0d34-0410-b5e6-96231b3b80d8
2012-06-05 01:06:15 +00:00
Jakob Stoklund Olesen
84423c8778 Delete dead code.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@157963 91177308-0d34-0410-b5e6-96231b3b80d8
2012-06-04 23:01:41 +00:00
Jakob Stoklund Olesen
15f1d8c557 Switch LiveIntervals member variable to LLVM naming standards.
No functional change.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@157957 91177308-0d34-0410-b5e6-96231b3b80d8
2012-06-04 22:39:14 +00:00
Lang Hames
f905f69668 Clear the entering, exiting and internal ranges of a bundle before collecting
ranges for the instruction about to be bundled. This fixes a bug in an external
project where an assertion was triggered due to spurious 'multiple defs' within
the bundle.

Patch by Ivan Llopard. Thanks Ivan!



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@157632 91177308-0d34-0410-b5e6-96231b3b80d8
2012-05-29 18:19:54 +00:00
Jakob Stoklund Olesen
97769fcdd1 LiveRangeQuery simplifies shrinkToUses().
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@157145 91177308-0d34-0410-b5e6-96231b3b80d8
2012-05-20 02:54:52 +00:00
Pete Cooper
722b6f1853 LiveIntervalUpdate validators weren't recorded after the calls to std::for_each. Turns out std::for_each doesn't update the variable passed in for the functor but instead copy constructs a new one.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@155041 91177308-0d34-0410-b5e6-96231b3b80d8
2012-04-18 20:29:17 +00:00
Andrew Trick
f70af52a8f misched: fix LiveInterval update for bottom-up scheduling
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@153162 91177308-0d34-0410-b5e6-96231b3b80d8
2012-03-21 04:12:16 +00:00
Andrew Trick
e0b51ab8d3 misched: fix LI update for bottom-up.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@153158 91177308-0d34-0410-b5e6-96231b3b80d8
2012-03-21 04:12:01 +00:00
Jakob Stoklund Olesen
92b7df07af Stop fixing bad machine code in LiveIntervalAnalysis.
The first def of a virtual register cannot also read the register.
Assert on such bad machine code instead of trying to fix it.
TwoAddressInstructionPass should never create code like that.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@152010 91177308-0d34-0410-b5e6-96231b3b80d8
2012-03-04 19:19:10 +00:00
Jakob Stoklund Olesen
741981adf3 Move getBundleStart() into MachineInstrBundle.h.
This allows the function to be inlined, and makes it suitable for use in
getInstructionIndex().

Also provide a const version. C++ is great for touch typing practice.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@151782 91177308-0d34-0410-b5e6-96231b3b80d8
2012-03-01 01:26:01 +00:00
Lang Hames
4586d257ab Add API "handleMoveIntoBundl" for updating liveness when moving instructions into
bundles. This method takes a bundle start and an MI being bundled, and makes
the intervals for the MI's operands appear to start/end on the bundle start.

Also fixes some minor cosmetic issues (whitespace, naming convention) in the
HMEditor code.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@151099 91177308-0d34-0410-b5e6-96231b3b80d8
2012-02-21 22:29:38 +00:00
Lang Hames
fd6d3217d3 Fix some bugs in HMEditor's moveAllOperandsInto logic.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@151006 91177308-0d34-0410-b5e6-96231b3b80d8
2012-02-21 00:00:36 +00:00