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3100 Commits

Author SHA1 Message Date
Chris Lattner
c4998a0138 Fix Transforms/DeadArgElim/2006-06-27-struct-ret.ll. -deadargelim should not 
remove the struct return argument of a csret function, even if it is obviously
dead.

llvm-svn: 28943
 2006-06-27 21:05:04 +00:00
Owen Anderson
b659bb4196 De-pessimize the handling of LCSSA Phi nodes in IndVarSimplify. Hopefully this 
will make Shootout-C/nestedloop faster.

llvm-svn: 28924
 2006-06-27 02:17:08 +00:00
Chris Lattner
49771a0462 random code cleanups, no functionality change 
llvm-svn: 28914
 2006-06-26 19:10:05 +00:00
Owen Anderson
f52351e50f Make LoopUnswitch able to unswitch loops with live-out values by taking advantage 
of LCSSA.  This results several times the number of unswitchings occurring on
tests such and timberwolfmc, unix-tbl, and ldecod.

llvm-svn: 28912
 2006-06-26 07:44:36 +00:00
Chris Lattner
053fb9319d Fix IndVarsSimplify/2006-06-16-Indvar-LCSSA-Crash.ll, a case where a 
"LCSSA" phi node causes indvars to break dominance properties.  This fixes
causes indvars to avoid inserting aggressive code in this case, instead
indvars should be fixed to be more aggressive in the face of lcssa phi's.

llvm-svn: 28850
 2006-06-17 01:02:31 +00:00
Evan Cheng
8a417a2fde Add missing casts. This fixed some regressions. 
llvm-svn: 28834
 2006-06-16 18:37:15 +00:00
Evan Cheng
1fc4025a9c More libcall transformations: 
printf("%s\n", str) -> puts(str)
printf("%c", c) -> putchar(c)
Also fixed fprintf(file, "%c", c) -> fputc(c, file)

llvm-svn: 28815
 2006-06-16 08:36:35 +00:00
Evan Cheng
f2ea587aa2 Simplify fprintf(file, "%s", str) to fputs(str, file). 
llvm-svn: 28814
 2006-06-16 04:52:30 +00:00
Chris Lattner
c482a9e31a Implement Transforms/InstCombine/bswap.ll, turning common shift/and/or bswap 
idioms into bswap intrinsics.

llvm-svn: 28803
 2006-06-15 19:07:26 +00:00
Chris Lattner
0c4f5a655a Fix Transforms/LoopUnswitch/2006-06-13-SingleEntryPHI.ll, a loop unswitch 
bug exposed by the recent lcssa work.

llvm-svn: 28779
 2006-06-14 04:46:17 +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
fd0a3d6e5c Reapply my 6/9 changes. The bug Evan saw no longer occurs. 
llvm-svn: 28759
 2006-06-12 21:49:21 +00:00
Chris Lattner
b5c9d7a0af Fix an infinite loop on Transforms/SimplifyCFG/2006-06-12-InfLoop.ll 
llvm-svn: 28758
 2006-06-12 20:18:01 +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
b1dc1d44f8 Add LCSSA as a requirement for LoopUnswitch, and assert that LoopUnswitch preserves 
LCSSA.

llvm-svn: 28739
 2006-06-09 18:40:32 +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
Evan Cheng
398f70292c RewriteExpr, either the new PHI node of induction variable or the 
post-increment value, should be first cast to the appropriated type (to the
type of the common expr). Otherwise, the rewrite of a use based on (common +
iv) may end up with an incorrect type.

llvm-svn: 28735
 2006-06-09 00:12:42 +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
Reid Spencer
d4b795902c Fix a spello in a comment. 
llvm-svn: 28714
 2006-06-07 21:24:10 +00:00
Chris Lattner
95cebb082f Fix a bug in a recent patch. This fixes UnitTests/Vector/Altivec/casts.c on 
PPC/altivec

llvm-svn: 28698
 2006-06-06 22:26:02 +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
Chris Lattner
540886f0ae Remove unneeded hook. Patch by Anton K. Thanks! 
llvm-svn: 28664
 2006-06-02 19:11:46 +00:00
Chris Lattner
02e0b4ddb7 Force anything that #includes llvm/Transforms/Utils/UnifyFunctionExitNodes.h 
to link in the implementation.  Thanks to Anton Korobeynikov for figuring out
what was going on here.

llvm-svn: 28660
 2006-06-02 18:40:06 +00:00
Chris Lattner
cdf2b1fc30 Remove dead #include 
llvm-svn: 28642
 2006-06-01 20:02:28 +00:00
Chris Lattner
cc340c02a4 Make the "pruning cloner" smarter. As it propagates constants through the 
code (while cloning) it often gets the branch/switch instructions.  Since it
knows that edges of the CFG are dead, it need not clone (or even look) at
the obviously dead blocks.  This should speed up the inliner substantially on
code where there are lots of inlinable calls to functions with constant
arguments.  On C++ code in particular, this kicks in.

llvm-svn: 28641
 2006-06-01 19:19:23 +00:00
Chris Lattner
f905a7b994 Silence a -pedantic warning. 
llvm-svn: 28632
 2006-06-01 17:16:21 +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
Chris Lattner
1df0e98ac2 Swap the order of operands created here. For +&|^, the order doesn't matter, 
but for sub, it really does!  Fix fixes a miscompilation of fibheap_cut in
llvmgcc4.

llvm-svn: 28600
 2006-05-31 21:14:00 +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
Chris Lattner
67c424e010 Fix some regression from the inliner patch I committed last night. This fixes 
ldecod, lencod, and SPASS.

llvm-svn: 28523
 2006-05-27 17:28:13 +00:00
Chris Lattner
be853d77e9 Switch the inliner over to using CloneAndPruneFunctionInto. This effectively 
makes it so that it constant folds instructions on the fly.  This is good
for several reasons:

0. Many instructions are constant foldable after inlining, particularly if
   inlining a call with constant arguments.
1. Without this, the inliner has to allocate memory for all of the instructions
   that can be constant folded, then a subsequent pass has to delete them.  This
   gets the job done without this extra work.
2. This makes the inliner *pass* a bit more aggressive: in particular, it
   partially solves a phase order issue where the inliner would inline lots
   of code that folds away to nothing, but think that the resultant function
   is big because of this code that will be gone.  Now the code never exists.

This is the first part of a 2-step process.  The second part will be smart
enough to see when this implicit constant folding propagates a constant into
a branch or switch instruction, making CFG edges dead.

This implements Transforms/Inline/inline_constprop.ll

llvm-svn: 28521
 2006-05-27 01:28:04 +00:00
Chris Lattner
3df13f4f22 Implement a new method, CloneAndPruneFunctionInto, as documented. 
llvm-svn: 28519
 2006-05-27 01:22:24 +00:00
Chris Lattner
bc3c879fcf Refactor some code to expose an interface to constant fold and instruction given it's opcode, typeand operands. 
llvm-svn: 28517
 2006-05-27 01:18:04 +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
Chris Lattner
dab43b2b0e Implement Transforms/InstCombine/store.ll:test2. 
llvm-svn: 28503
 2006-05-26 19:19:20 +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