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205 Commits

Author SHA1 Message Date
Jakob Stoklund Olesen db529a8a5d Analyze blocks with uses separately from live-through blocks without uses. 
About 90% of the relevant blocks are live-through without uses, and the only
information required about them is their number. This saves memory and enables
later optimizations that need to look at only the use-blocks.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@128985 91177308-0d34-0410-b5e6-96231b3b80d8
 2011-04-06 03:57:00 +00:00
Jakob Stoklund Olesen 71d9e65ee7 Sign error 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@128963 91177308-0d34-0410-b5e6-96231b3b80d8
 2011-04-05 23:43:16 +00:00
Jakob Stoklund Olesen b3dd82670a Don't crash when a value is defined after the last split point. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@128962 91177308-0d34-0410-b5e6-96231b3b80d8
 2011-04-05 23:43:14 +00:00
Jakob Stoklund Olesen a2948ef5ac Use std::unique instead of a SmallPtrSet to ensure unique instructions in UseSlots. 
This allows us to always keep the smaller slot for an instruction which is what
we want when a register has early clobber defines.

Drop the UsingInstrs set and the UsingBlocks map. They are no longer needed.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@128886 91177308-0d34-0410-b5e6-96231b3b80d8
 2011-04-05 15:18:18 +00:00
Jakob Stoklund Olesen 612f7807c5 Stop precomputing last split points, query the SplitAnalysis cache on demand. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@128875 91177308-0d34-0410-b5e6-96231b3b80d8
 2011-04-05 04:20:29 +00:00
Jakob Stoklund Olesen 1a7744501a Cache the fairly expensive last split point computation and provide a fast 
inlined path for the common case.

Most basic blocks don't contain a call that may throw, so the last split point
os simply the first terminator.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@128874 91177308-0d34-0410-b5e6-96231b3b80d8
 2011-04-05 04:20:27 +00:00
Jakob Stoklund Olesen 6c8afd728e Stop caching basic block index ranges now that SlotIndexes can keep up. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@128821 91177308-0d34-0410-b5e6-96231b3b80d8
 2011-04-04 15:32:15 +00:00
Jakob Stoklund Olesen 6094bd87d8 Recompute register class and hint for registers created during spilling. 
The spill weight is not recomputed for an unspillable register - it stays infinite.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@128490 91177308-0d34-0410-b5e6-96231b3b80d8
 2011-03-29 21:20:19 +00:00
Jakob Stoklund Olesen c8ec765551 Handle the special case when all uses follow the last split point. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@128450 91177308-0d34-0410-b5e6-96231b3b80d8
 2011-03-29 03:12:04 +00:00
Jakob Stoklund Olesen ef1f5ccca7 Amend debug output. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@128398 91177308-0d34-0410-b5e6-96231b3b80d8
 2011-03-27 22:49:23 +00:00
Jakob Stoklund Olesen 2dc455a366 Process all dead defs after rematerializing during splitting. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@127973 91177308-0d34-0410-b5e6-96231b3b80d8
 2011-03-20 19:46:23 +00:00
Jakob Stoklund Olesen 7cec179a64 Be more accurate about the slot index reading a register when dealing with defs 
and early clobbers.

Assert when trying to find an undefined value.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@127856 91177308-0d34-0410-b5e6-96231b3b80d8
 2011-03-18 03:06:02 +00:00
Jakob Stoklund Olesen 6a3dbd3b25 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.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@127827 91177308-0d34-0410-b5e6-96231b3b80d8
 2011-03-17 20:37:07 +00:00
Jakob Stoklund Olesen 2254227791 Rewrite instructions as part of ConnectedVNInfoEqClasses::Distribute. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@127779 91177308-0d34-0410-b5e6-96231b3b80d8
 2011-03-17 00:23:45 +00:00
Jakob Stoklund Olesen 29ef87599c Preserve both isPHIDef and isDefByCopy bits when copying parent values. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@127697 91177308-0d34-0410-b5e6-96231b3b80d8
 2011-03-15 21:13:22 +00:00
Jakob Stoklund Olesen 5881799d0c Delete dead code after rematerializing. 
LiveRangeEdit::eliminateDeadDefs() will eventually be used by coalescing,
splitting, and spilling for dead code elimination. It can delete chains of dead
instructions as long as there are no dependency loops.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@127287 91177308-0d34-0410-b5e6-96231b3b80d8
 2011-03-08 22:46:11 +00:00
Jakob Stoklund Olesen 2b0f9e73d8 Work around a coalescer bug. 
The coalescer can in very rare cases leave too large live intervals around after
rematerializing cheap-as-a-move instructions.

Linear scan doesn't really care, but live range splitting gets very confused
when a live range is killed by a ghost instruction.

I will fix this properly in the coalescer after 2.9 branches.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@127096 91177308-0d34-0410-b5e6-96231b3b80d8
 2011-03-05 18:33:49 +00:00
Jakob Stoklund Olesen fb69810a2b Tweak debug output. No functional changes. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@127006 91177308-0d34-0410-b5e6-96231b3b80d8
 2011-03-04 18:08:26 +00:00
Jakob Stoklund Olesen 13ba2dab63 Use an IndexedMap instead of a DenseMap for the live-out cache. 
This speeds up updateSSA() so it only accounts for 5% of the live range
splitting time.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@126972 91177308-0d34-0410-b5e6-96231b3b80d8
 2011-03-04 00:15:36 +00:00
Jakob Stoklund Olesen 36d61863bc Cache basic block bounds instead of asking SlotIndexes::getMBBRange all the time. 
This speeds up the greedy register allocator by 15%.
DenseMap is not as fast as one might hope.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@126921 91177308-0d34-0410-b5e6-96231b3b80d8
 2011-03-03 03:41:29 +00:00
Jakob Stoklund Olesen bece06f0c6 Change the SplitEditor interface to a single instance can be shared for multiple splits. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@126912 91177308-0d34-0410-b5e6-96231b3b80d8
 2011-03-03 01:29:13 +00:00
Jakob Stoklund Olesen 8701768ae2 Only run the updateSSA loop when we have actually seen multiple values. 
When only a single value has been seen, new PHIDefs are never needed.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@126911 91177308-0d34-0410-b5e6-96231b3b80d8
 2011-03-03 01:29:10 +00:00
Jakob Stoklund Olesen a2cae58411 Turn the Edit member into a pointer so it can change dynamically. 
No functional change.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@126898 91177308-0d34-0410-b5e6-96231b3b80d8
 2011-03-02 23:31:50 +00:00
Jakob Stoklund Olesen 4670353a21 Transfer simply defined values directly without recomputing liveness and SSA. 
Values that map to a single new value in a new interval after splitting don't
need new PHIDefs, and if the parent value was never rematerialized the live
range will be the same.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@126894 91177308-0d34-0410-b5e6-96231b3b80d8
 2011-03-02 23:05:19 +00:00
Jakob Stoklund Olesen e2dc0c978e Extract a method. No functional change. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@126893 91177308-0d34-0410-b5e6-96231b3b80d8
 2011-03-02 23:05:16 +00:00