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108 Commits

Author SHA1 Message Date
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
Chris Lattner
8b29caac2c clarify a note 
llvm-svn: 45914
 2008-01-12 18:58:46 +00:00
Chris Lattner
08a33a998a add some notes. 
llvm-svn: 45854
 2008-01-11 06:17:47 +00:00
Chris Lattner
3c2a517080 add a note 
llvm-svn: 45837
 2008-01-10 18:25:41 +00:00
Chris Lattner
4253eeaeb3 add a note 
llvm-svn: 45766
 2008-01-09 00:17:57 +00:00
Chris Lattner
66e631ace3 possible switch lowering improvement. 
llvm-svn: 45720
 2008-01-07 21:38:14 +00:00
Chris Lattner
9aefefc673 add a note 
llvm-svn: 45698
 2008-01-07 07:46:23 +00:00
Chris Lattner
d82b30a996 this is done. 
llvm-svn: 45408
 2007-12-29 19:38:02 +00:00
Chris Lattner
78c7878ca4 expand note. 
llvm-svn: 45393
 2007-12-29 01:05:01 +00:00
Chris Lattner
b8e060f7a6 add a note. 
llvm-svn: 45388
 2007-12-28 22:30:05 +00:00
Chris Lattner
e53df84267 add a note 
llvm-svn: 45377
 2007-12-28 04:42:05 +00:00
Christopher Lamb
aeb76743dc Fold certain additions through selects (and their compares) so as to eliminate subtractions. This code is often produced by the SMAX expansion in SCEV. 
This implements test/Transforms/InstCombine/2007-12-18-AddSelCmpSub.ll

llvm-svn: 45158
 2007-12-18 09:34:41 +00:00
Chris Lattner
ad090a712a add a missed case. 
llvm-svn: 45141
 2007-12-18 01:19:18 +00:00
Chris Lattner
c467b49c96 implement a readme entry, compiling the code into: 
_foo:
	movl	$12, %eax
	andl	4(%esp), %eax
	movl	_array(%eax), %eax
	ret

instead of:

_foo:
	movl	4(%esp), %eax
	shrl	$2, %eax
	andl	$3, %eax
	movl	_array(,%eax,4), %eax
	ret

As it turns out, this triggers all the time, in a wide variety of
situations, for example, I see diffs like this in various programs:

-       movl    8(%eax), %eax
-       shll    $2, %eax
-       andl    $1020, %eax
-       movl    (%esi,%eax), %eax
+       movzbl  8(%eax), %eax
+       movl    (%esi,%eax,4), %eax


-       shll    $2, %edx
-       andl    $1020, %edx
-       movl    (%edi,%edx), %edx
+       andl    $255, %edx
+       movl    (%edi,%edx,4), %edx

Unfortunately, I also see stuff like this, which can be fixed in the
X86 backend:

-       andl    $85, %ebx
-       addl    _bit_count(,%ebx,4), %ebp
+       shll    $2, %ebx
+       andl    $340, %ebx
+       addl    _bit_count(%ebx), %ebp

llvm-svn: 44656
 2007-12-06 07:33:36 +00:00
Chris Lattner
e3f1487574 add a note 
llvm-svn: 44638
 2007-12-05 23:05:06 +00:00
Chris Lattner
17feaa781c add a note 
llvm-svn: 42573
 2007-10-03 06:10:59 +00:00
Chris Lattner
272510387e add a note 
llvm-svn: 36811
 2007-05-05 22:44:08 +00:00
Chris Lattner
0074283b61 the mason example is implemented. Move some examples out of llvm/test, 
upgrade the syntax of some other examples.

llvm-svn: 36806
 2007-05-05 22:29:06 +00:00
Chris Lattner
a04981fbda add a bad case evan though of. 
llvm-svn: 35296
 2007-03-24 06:01:32 +00:00