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136 Commits

Author SHA1 Message Date
Chris Lattner
444c69afae add PR# 
llvm-svn: 81770
 2009-09-14 16:49:26 +00:00
Dan Gohman
00ee3a9a1a Transform -X/C to X/-C, implementing a README.txt entry. 
llvm-svn: 78812
 2009-08-12 16:37:02 +00:00
Eli Friedman
a62553ec99 Remove a couple of already-implemented notes. 
llvm-svn: 76631
 2009-07-21 20:05:43 +00:00
Nick Lewycky
d18c73933e Move PR4517 to README.txt. 
llvm-svn: 75098
 2009-07-09 04:03:30 +00:00
Dan Gohman
d13f674130 Factor the code for collecting IV users out of LSR into an IVUsers class, 
and generalize it so that it can be used by IndVarSimplify. Implement the
base IndVarSimplify transformation code using IVUsers. This removes
TestOrigIVForWrap and associated code, as ScalarEvolution now has enough
builtin overflow detection and folding logic to handle all the same cases,
and more. Run "opt -iv-users -analyze -disable-output" on your favorite
loop for an example of what IVUsers does.

This lets IndVarSimplify eliminate IV casts and compute trip counts in
more cases. Also, this happens to finally fix the remaining testcases
in PR1301.

Now that IndVarSimplify is being more aggressive, it occasionally runs
into the problem where ScalarEvolutionExpander's code for avoiding
duplicate expansions makes it difficult to ensure that all expanded
instructions dominate all the instructions that will use them. As a
temporary measure, IndVarSimplify now uses a FixUsesBeforeDefs function
to fix up instructions inserted by SCEVExpander. Fortunately, this code
is contained, and can be easily removed once a more comprehensive
solution is available.

llvm-svn: 71535
 2009-05-12 02:17:14 +00:00
Dan Gohman
2060db5db5 Fix two wording errors that Duncan spotted. 
llvm-svn: 71459
 2009-05-11 18:51:16 +00:00
Dan Gohman
361dcef406 LLVM has unaligned loads and stores now. 
llvm-svn: 71449
 2009-05-11 18:06:05 +00:00
Dan Gohman
d365c7a5a3 Upgrade this example to new-style syntax. 
llvm-svn: 71447
 2009-05-11 18:04:52 +00:00
Chris Lattner
f5f153394d remove some done things: we have nocapture and SROA is smarter. 
llvm-svn: 71443
 2009-05-11 17:41:40 +00:00
Chris Lattner
d50058b0c0 add a note 
llvm-svn: 71442
 2009-05-11 17:36:33 +00:00
Eli Friedman
69845a85a5 Remove a completed optimization. Add a potential optimization I ran 
into.

llvm-svn: 71352
 2009-05-09 08:40:15 +00:00
Chris Lattner
9b435e06e4 add a note 
llvm-svn: 67953
 2009-03-28 19:26:55 +00:00
Nick Lewycky
8672fb675c Add a totally synthetic situation I came up with while looking at a bug in 
related code.

llvm-svn: 65437
 2009-02-25 06:52:48 +00:00
Torok Edwin
b399b47942 add note about sin 
llvm-svn: 65137
 2009-02-20 18:42:06 +00:00
Torok Edwin
6dd79be128 add note about possible GEP improvement with fields of size 0. 
llvm-svn: 62925
 2009-01-24 19:30:25 +00:00
Chris Lattner
fcf56e7fbe add a note 
llvm-svn: 62760
 2009-01-22 07:16:03 +00:00
Dan Gohman
7663e08915 Add a README entry noticed while investigating PR3216. 
llvm-svn: 62558
 2009-01-20 01:07:33 +00:00
Chris Lattner
fe3e114d7a add some more crazy strlen and memcpy stuff I noticed in spec. 
llvm-svn: 61918
 2009-01-08 07:34:55 +00:00
Chris Lattner
304f33297f add some notes about strlen craziness in eon. 
llvm-svn: 61917
 2009-01-08 06:52:57 +00:00
Chris Lattner
1cfa9f47db add a note 
llvm-svn: 61513
 2008-12-31 00:54:13 +00:00
Chris Lattner
bb08a35f9e add some notes for simplifylibcalls optimizations 
llvm-svn: 61385
 2008-12-23 20:52:52 +00:00
Chris Lattner
f678691da6 add some more notes. 
llvm-svn: 61033
 2008-12-15 08:32:28 +00:00
Chris Lattner
8119a1f70d Add a testcase for GCC PR 23455, which lpre handles now. Add some 
comments about why we're not getting other cases.

llvm-svn: 61032
 2008-12-15 07:49:24 +00:00
Chris Lattner
30c1871282 gvn now hoists this load out of the hot non-call path. 
llvm-svn: 61028
 2008-12-15 06:34:48 +00:00
Chris Lattner
3987712b2d move an entry, add some notes, remove a completed item (IMPLICIT_DEF) 
llvm-svn: 60821
 2008-12-10 01:30:48 +00:00
Chris Lattner
bd507e3e4d improve a note. 
llvm-svn: 60636
 2008-12-07 00:15:10 +00:00
Chris Lattner
1fa53e3e56 some more PRE/GVN/DSE related notes. 
llvm-svn: 60633
 2008-12-06 22:52:12 +00:00
Chris Lattner
a87ff83a83 some random notes. 
llvm-svn: 60624
 2008-12-06 19:28:22 +00:00
Chris Lattner
40462e032c add a note 
llvm-svn: 60404
 2008-12-02 06:32:34 +00:00
Bill Wendling
654cc91c36 - Remove the buggy -X/C -> X/-C transform. This isn't valid when X isn't a 
constant. If X is a constant, then this is folded elsewhere.

- Added a note to Target/README.txt to indicate that we'd like to implement
  this when we're able.

llvm-svn: 60399
 2008-12-02 05:12:47 +00:00
Bill Wendling
23684a026c Implement ((A|B)&1)|(B&-2) -> (A&1) | B transformation. This also takes care of 
permutations of this pattern.

llvm-svn: 60312
 2008-12-01 01:07:11 +00:00
Bill Wendling
66a7442059 Add instruction combining for ((A&~B)|(~A&B)) -> A^B and all permutations. 
llvm-svn: 60291
 2008-11-30 13:52:49 +00:00
Bill Wendling
3e27ac16a6 Implement (A&((~A)|B)) -> A&B transformation in the instruction combiner. This 
takes care of all permutations of this pattern.

llvm-svn: 60290
 2008-11-30 13:08:13 +00:00
Eli Friedman
97d37825f1 Moving potential optimizations out of PR2330 into lib/Target/README.txt. 
Hopefully this isn't too much stuff to dump into this file.

llvm-svn: 60285
 2008-11-30 07:36:04 +00:00
Nick Lewycky
f5d5d6026f Also update the README. 
llvm-svn: 60188
 2008-11-27 22:41:45 +00:00
Nick Lewycky
0064d6236e Add a synthetic missed optimization. 
llvm-svn: 60186
 2008-11-27 22:12:22 +00:00
Torok Edwin
e0ecce06a0 move the note to the correct README 
llvm-svn: 58104
 2008-10-24 19:23:07 +00:00
Torok Edwin
5560590122 add note about va_arg code on x86 and x86-64 
llvm-svn: 58103
 2008-10-24 19:20:05 +00:00
Dan Gohman
ac8c7772ba This is now partly done. 
llvm-svn: 57734
 2008-10-17 21:39:27 +00:00
Chris Lattner
2ce4f1e7ad move PR1941 here. 
llvm-svn: 57586
 2008-10-15 16:33:52 +00:00
Chris Lattner
866578b51b move PR1604 here. 
llvm-svn: 57582
 2008-10-15 16:06:03 +00:00
Chris Lattner
4ccc775d89 move PR1488 into this file. 
llvm-svn: 57579
 2008-10-15 16:02:15 +00:00
Chris Lattner
d91c01484c add a note 
llvm-svn: 57557
 2008-10-15 05:53:25 +00:00
Chris Lattner
ed0f84ee2d this case is matched now. 
llvm-svn: 57096
 2008-10-05 02:16:12 +00:00
Chris Lattner
31ad910029 add a note 
llvm-svn: 54985
 2008-08-19 06:22:16 +00:00
Chris Lattner
6e083dfadd move some more stuff out of my email into readme.txt 
llvm-svn: 54603
 2008-08-10 01:14:08 +00:00
Chris Lattner
7673a468dc add a note 
llvm-svn: 54602
 2008-08-10 00:47:21 +00:00
Chris Lattner
15ae951af5 Add a note. 
llvm-svn: 53535
 2008-07-14 00:19:59 +00:00
Nick Lewycky
1bcd80adf7 Peer through sext/zext when looking for not(cmp). 
llvm-svn: 51819
 2008-05-31 19:01:33 +00:00
Nick Lewycky
566baa2c72 Yay us! Every one of these examples turns into icmp/zext/ret. 
llvm-svn: 51818
 2008-05-31 18:20:26 +00:00