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178 Commits

Author SHA1 Message Date
Chris Lattner c2d3d3112e eliminate RegisterOpt. It does the same thing as RegisterPass. 
llvm-svn: 29925
 2006-08-27 22:42:52 +00:00
Chris Lattner 38b6e8382a Add special check to avoid isLoop call. Simple, but doesn't seem to speed 
up lcssa much in practice.

llvm-svn: 29465
 2006-08-02 00:16:47 +00:00
Chris Lattner 5a2bc786be Replace the SSA update code in LCSSA with a bottom-up approach instead of a top 
down approach, inspired by discussions with Tanya.

This approach is significantly faster, because it does not need dominator
frontiers and it does not insert extraneous unused PHI nodes.  For example, on
252.eon, in a release-asserts build, this speeds up LCSSA (which is the slowest
pass in gccas) from 9.14s to 0.74s on my G5.  This code is also slightly smaller
and significantly simpler than the old code.

Amusingly, in a normal Release build (which includes the
"assert(L->isLCSSAForm());" assertion), asserting that the result of LCSSA
is in LCSSA form is actually slower than the LCSSA transformation pass
itself on 252.eon.  I will see if Loop::isLCSSAForm can be sped up next.

llvm-svn: 29463
 2006-08-02 00:06:09 +00:00
Owen Anderson fe6e97d275 Fix typo in the comment. 
llvm-svn: 29078
 2006-07-09 21:35:40 +00:00
Owen Anderson aecaabb6e1 Add a fix for an issue where LCSSA would fail to insert undef's in some corner 
cases.  Ideally, this issue will go away in the future as LCSSA gets smarter
about which Phi nodes it inserts.

llvm-svn: 29076
 2006-07-09 08:14:06 +00:00
Chris Lattner e3abb14503 Use the PotDoms map to memoize 'dominating value' lookup. With this patch, 
LCSSA is still the slowest pass when gccas'ing 252.eon, but now it only takes
39s instead of 289s. :)

llvm-svn: 28776
 2006-06-14 01:13:57 +00:00
Owen Anderson e714a5c549 Fix another instance where PHI nodes need special treatment. 
llvm-svn: 28774
 2006-06-13 20:50:09 +00:00
Owen Anderson 3f8ff0449a Fix a bug that was causing major slowdowns in povray. This was due to LCSSA 
not handling PHI nodes correctly when determining if a value was live-out.

This patch reduces the number of detected live-out variables in the testcase
from 6565 to 485.

llvm-svn: 28771
 2006-06-13 19:37:18 +00:00
Owen Anderson 0ac336965e Fix for 2006-06-26-MultipleExitsSingleBlock. 
If a single exit block has multiple predecessors within the loop, it will
appear in the exit blocks list more than once.  LCSSA needs to take that into
account so that it doesn't double process that exit block.

llvm-svn: 28750
 2006-06-12 07:10:16 +00:00
Owen Anderson b538f14d2a Re-commit the safe parts of my 6/9 patch. Still working on fixing the unsafe parts. 
llvm-svn: 28748
 2006-06-11 19:22:28 +00:00
Evan Cheng 1b6e310e6f Back out Owen's 6/9 changes. They broke MultiSource/Benchmarks/Prolangs-C/bison (and perhaps others). 
llvm-svn: 28747
 2006-06-11 09:32:57 +00:00
Owen Anderson 505adff3f0 Make Loop able to verify that it is in LCSSA-form, and have the LCSSA pass assert 
on this.

llvm-svn: 28738
 2006-06-09 18:33:30 +00:00
Owen Anderson 5d029264ec Update some comments, and expose LCSSAID in preparation for having other passes 
require LCSSA.

llvm-svn: 28734
 2006-06-08 20:02:53 +00:00
Owen Anderson ac601b4c4b Fix some formatting, and use inLoop() when appropriate. 
llvm-svn: 28694
 2006-06-06 04:36:36 +00:00
Owen Anderson 9e81c1bb03 Stop a memory leak, and update some comments. 
llvm-svn: 28693
 2006-06-06 04:28:30 +00:00
Owen Anderson 766f90b08e Some more clean-up, and squash an IDF-Phi related bug. 
llvm-svn: 28680
 2006-06-04 00:55:19 +00:00
Owen Anderson eb33815f1b Various clean-ups suggested by Chris. 
llvm-svn: 28678
 2006-06-04 00:02:23 +00:00
Owen Anderson d00eacc4f9 Fix a bug in Phi-noded insertion. Also, update some comments to reflect what's 
actually going on.

llvm-svn: 28677
 2006-06-03 23:22:50 +00:00
Owen Anderson 619e4ba57f Remove a FIXME that was fixed with my last patch. 
llvm-svn: 28619
 2006-06-01 06:07:40 +00:00
Owen Anderson cd76fa04a1 More cleanups. Also, add a special case for updating PHI nodes, and 
reimplement getValueDominatingFunction to walk the DominanceTree rather than
just searching blindly.

llvm-svn: 28618
 2006-06-01 06:05:47 +00:00
Owen Anderson dad8c57340 Extract a huge loop into a helper method. Fix a few iterator-invalidation bugs. 
llvm-svn: 28599
 2006-05-31 20:55:06 +00:00
Owen Anderson 8a8f278f15 Add Use replacement. Assuming there is nothing horribly wrong with this, LCSSA 
is now theoretically feature-complete.  It has not, however, been thoroughly
test, and is still considered experimental.

llvm-svn: 28529
 2006-05-29 01:00:00 +00:00
Owen Anderson 152d063ccb Major think-o. Iterate over all live out-of-loop values, and perform the 
other calculations on each individually, rather than trying to delay it and do
them all at the end.

llvm-svn: 28527
 2006-05-28 19:33:28 +00:00
Owen Anderson 1310e42803 Make LCSSA insert proper Phi nodes throughout the rest of the CFG by computing 
the iterated Dominance Frontier of the loop-closure Phi's.  This is the
second phase of the LCSSA pass.  The third phase (coming soon) will be to
update all uses of loop variables to use the loop-closure Phi's instead.

llvm-svn: 28524
 2006-05-27 18:47:11 +00:00
Owen Anderson b4e16996f1 A few small clean-ups, and the addition of an LCSSA statistic. 
llvm-svn: 28512
 2006-05-27 00:31:37 +00:00
Owen Anderson 6e047ab8fc Fix a copy-and-paste-o that would break some compilers. 
llvm-svn: 28507
 2006-05-26 21:19:17 +00:00
Owen Anderson f3dd3e2bfd Clean up and refactor LCSSA a bunch. It should also run faster now, though 
there's still a lot of work to be done on it.

llvm-svn: 28506
 2006-05-26 21:11:53 +00:00
Owen Anderson 8eca8910b6 Skeletal LCSSA pass. This is currently non-functional. Expect functionality 
and documentation updates soo.

llvm-svn: 28495
 2006-05-26 13:58:26 +00:00