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126 Commits

Author SHA1 Message Date
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
Chris Lattner
504c367af9 trip count computation deficiency 
llvm-svn: 51222
 2008-05-17 15:37:38 +00:00
Nick Lewycky
7d33dc0878 Moved from PR1570. 
llvm-svn: 48965
 2008-03-30 19:07:11 +00:00
Chris Lattner
f166a78d79 add a note. 
llvm-svn: 48583
 2008-03-20 04:46:13 +00:00
Chris Lattner
dc9bf8fda9 various rotate fun. 
llvm-svn: 48438
 2008-03-17 01:47:51 +00:00
Chris Lattner
f818270d43 another random note 
llvm-svn: 47831
 2008-03-02 19:29:42 +00:00
Chris Lattner
38a684c0c9 Move pr717 to here. 
llvm-svn: 47803
 2008-03-02 02:51:40 +00:00
Chris Lattner
f0329b6170 add a note 
llvm-svn: 47720
 2008-02-28 17:21:27 +00:00
Chris Lattner
dab318a206 target-indep codegen memcpy lowering issue. 
llvm-svn: 47705
 2008-02-28 05:34:27 +00:00
Chris Lattner
79ecc053ca upgrade some tests. 
llvm-svn: 47280
 2008-02-18 18:46:39 +00:00
Nate Begeman
66df9740df Add a note 
llvm-svn: 47279
 2008-02-18 18:39:23 +00:00