Eli Friedman
1e08ca7313
Remove a couple of already-implemented notes.
...
llvm-svn: 76631
2009-07-21 20:05:43 +00:00
Nick Lewycky
4e705e421c
Move PR4517 to README.txt.
...
llvm-svn: 75098
2009-07-09 04:03:30 +00:00
Dan Gohman
d76d71a291
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
1dbb40f481
Fix two wording errors that Duncan spotted.
...
llvm-svn: 71459
2009-05-11 18:51:16 +00:00
Dan Gohman
b0ddbbe7c4
LLVM has unaligned loads and stores now.
...
llvm-svn: 71449
2009-05-11 18:06:05 +00:00
Dan Gohman
7ee3a4371f
Upgrade this example to new-style syntax.
...
llvm-svn: 71447
2009-05-11 18:04:52 +00:00
Chris Lattner
17a999efac
remove some done things: we have nocapture and SROA is smarter.
...
llvm-svn: 71443
2009-05-11 17:41:40 +00:00
Chris Lattner
183a7ec027
add a note
...
llvm-svn: 71442
2009-05-11 17:36:33 +00:00
Eli Friedman
f2d589fe24
Remove a completed optimization. Add a potential optimization I ran
...
into.
llvm-svn: 71352
2009-05-09 08:40:15 +00:00
Chris Lattner
356d974a93
add a note
...
llvm-svn: 67953
2009-03-28 19:26:55 +00:00
Nick Lewycky
5c10a3aa7f
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
87d5ca083b
add note about sin
...
llvm-svn: 65137
2009-02-20 18:42:06 +00:00
Torok Edwin
3cedd4dc64
add note about possible GEP improvement with fields of size 0.
...
llvm-svn: 62925
2009-01-24 19:30:25 +00:00
Chris Lattner
705ac7082b
add a note
...
llvm-svn: 62760
2009-01-22 07:16:03 +00:00
Dan Gohman
83d2e066c1
Add a README entry noticed while investigating PR3216.
...
llvm-svn: 62558
2009-01-20 01:07:33 +00:00
Chris Lattner
6c2ee50e28
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
7cb3ae0505
add some notes about strlen craziness in eon.
...
llvm-svn: 61917
2009-01-08 06:52:57 +00:00
Chris Lattner
a41422566b
add a note
...
llvm-svn: 61513
2008-12-31 00:54:13 +00:00
Chris Lattner
8a35adf3a5
add some notes for simplifylibcalls optimizations
...
llvm-svn: 61385
2008-12-23 20:52:52 +00:00
Chris Lattner
5d196e64f1
add some more notes.
...
llvm-svn: 61033
2008-12-15 08:32:28 +00:00
Chris Lattner
81ee731852
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
3c2c36b590
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
56fe52e287
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
a163568c03
improve a note.
...
llvm-svn: 60636
2008-12-07 00:15:10 +00:00
Chris Lattner
da93063acc
some more PRE/GVN/DSE related notes.
...
llvm-svn: 60633
2008-12-06 22:52:12 +00:00
Chris Lattner
543d6c65fa
some random notes.
...
llvm-svn: 60624
2008-12-06 19:28:22 +00:00
Chris Lattner
0cdc0bbb8a
add a note
...
llvm-svn: 60404
2008-12-02 06:32:34 +00:00
Bill Wendling
85de4b35ca
- 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
5b902c5b1e
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
de89bc275c
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
9eef421e12
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
e16c0ff1d3
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
edd5d3e4e9
Also update the README.
...
llvm-svn: 60188
2008-11-27 22:41:45 +00:00
Nick Lewycky
b3dc4ad5b4
Add a synthetic missed optimization.
...
llvm-svn: 60186
2008-11-27 22:12:22 +00:00
Torok Edwin
33986d8f17
move the note to the correct README
...
llvm-svn: 58104
2008-10-24 19:23:07 +00:00
Torok Edwin
fcaae54669
add note about va_arg code on x86 and x86-64
...
llvm-svn: 58103
2008-10-24 19:20:05 +00:00
Dan Gohman
209fc26462
This is now partly done.
...
llvm-svn: 57734
2008-10-17 21:39:27 +00:00
Chris Lattner
9b83197b76
move PR1941 here.
...
llvm-svn: 57586
2008-10-15 16:33:52 +00:00
Chris Lattner
6d275fd6e1
move PR1604 here.
...
llvm-svn: 57582
2008-10-15 16:06:03 +00:00
Chris Lattner
843dacc937
move PR1488 into this file.
...
llvm-svn: 57579
2008-10-15 16:02:15 +00:00
Chris Lattner
117792afec
add a note
...
llvm-svn: 57557
2008-10-15 05:53:25 +00:00
Chris Lattner
f9325e5f67
this case is matched now.
...
llvm-svn: 57096
2008-10-05 02:16:12 +00:00
Chris Lattner
d7dd8b8aeb
add a note
...
llvm-svn: 54985
2008-08-19 06:22:16 +00:00
Chris Lattner
113b336caa
move some more stuff out of my email into readme.txt
...
llvm-svn: 54603
2008-08-10 01:14:08 +00:00
Chris Lattner
4afb010309
add a note
...
llvm-svn: 54602
2008-08-10 00:47:21 +00:00
Chris Lattner
8377c02308
Add a note.
...
llvm-svn: 53535
2008-07-14 00:19:59 +00:00
Nick Lewycky
035fe6f716
Peer through sext/zext when looking for not(cmp).
...
llvm-svn: 51819
2008-05-31 19:01:33 +00:00
Nick Lewycky
69a51cbd6d
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
1bafa6c886
trip count computation deficiency
...
llvm-svn: 51222
2008-05-17 15:37:38 +00:00
Nick Lewycky
9fb8908457
Moved from PR1570.
...
llvm-svn: 48965
2008-03-30 19:07:11 +00:00