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177 Commits

Author SHA1 Message Date
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
Chris Lattner fd5fe2a83d add a note. 
llvm-svn: 48583
 2008-03-20 04:46:13 +00:00
Chris Lattner af8d3c6699 various rotate fun. 
llvm-svn: 48438
 2008-03-17 01:47:51 +00:00
Chris Lattner d51372aa96 another random note 
llvm-svn: 47831
 2008-03-02 19:29:42 +00:00
Chris Lattner 647c6642e7 Move pr717 to here. 
llvm-svn: 47803
 2008-03-02 02:51:40 +00:00
Chris Lattner 643dce1146 add a note 
llvm-svn: 47720
 2008-02-28 17:21:27 +00:00
Chris Lattner 765be8874d target-indep codegen memcpy lowering issue. 
llvm-svn: 47705
 2008-02-28 05:34:27 +00:00
Chris Lattner 6bb6a55f01 upgrade some tests. 
llvm-svn: 47280
 2008-02-18 18:46:39 +00:00
Nate Begeman 0fddc34485 Add a note 
llvm-svn: 47279
 2008-02-18 18:39:23 +00:00
Chris Lattner afb514a7b4 clarify a note 
llvm-svn: 45914
 2008-01-12 18:58:46 +00:00
Chris Lattner 87b0c13104 add some notes. 
llvm-svn: 45854
 2008-01-11 06:17:47 +00:00
Chris Lattner 1d07b65add add a note 
llvm-svn: 45837
 2008-01-10 18:25:41 +00:00
Chris Lattner 45e5032b1d add a note 
llvm-svn: 45766
 2008-01-09 00:17:57 +00:00
Chris Lattner 730d088be1 possible switch lowering improvement. 
llvm-svn: 45720
 2008-01-07 21:38:14 +00:00
Chris Lattner d7857eafd0 add a note 
llvm-svn: 45698
 2008-01-07 07:46:23 +00:00
Chris Lattner 4e6cbb2fe2 this is done. 
llvm-svn: 45408
 2007-12-29 19:38:02 +00:00
Chris Lattner 7cafd92aa9 expand note. 
llvm-svn: 45393
 2007-12-29 01:05:01 +00:00
Chris Lattner 9d53b611d1 add a note. 
llvm-svn: 45388
 2007-12-28 22:30:05 +00:00
Chris Lattner 180f0e9044 add a note 
llvm-svn: 45377
 2007-12-28 04:42:05 +00:00
Christopher Lamb 8b09a464b4 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 52a9e40789 add a missed case. 
llvm-svn: 45141
 2007-12-18 01:19:18 +00:00
Chris Lattner 7c709a5d08 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 5e224c32f4 add a note 
llvm-svn: 44638
 2007-12-05 23:05:06 +00:00
Chris Lattner 4d4e9cdb62 add a note 
llvm-svn: 42573
 2007-10-03 06:10:59 +00:00
Chris Lattner 9958b82733 add a note 
llvm-svn: 36811
 2007-05-05 22:44:08 +00:00
Chris Lattner 2cca31f77f 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 43cab75914 add a bad case evan though of. 
llvm-svn: 35296
 2007-03-24 06:01:32 +00:00
Chris Lattner 9b3e2b4ad9 minor updates 
llvm-svn: 35143
 2007-03-18 22:41:33 +00:00
Nick Lewycky f764441977 This is implemented. We now generate: 
entry:
        icmp ugt i32 %x, 4              ; <i1>:0 [#uses=1]
        br i1 %0, label %cond_true, label %cond_false

cond_true:              ; preds = %entry
        %tmp1 = tail call i32 (...)* @bar( i32 12 )             ; <i32> [#uses=0]
        ret void

cond_false:             ; preds = %entry
        switch i32 %x, label %cond_true15 [
                 i32 4, label %cond_true3
                 i32 3, label %cond_true7
                 i32 2, label %cond_true11
                 i32 0, label %cond_false17
        ]

...

llvm-svn: 35142
 2007-03-18 14:37:20 +00:00
Reid Spencer 09575bac2e For PR1195: 
Change use of "packed" term to "vector" in comments, strings, variable
names, etc.

llvm-svn: 34300
 2007-02-15 03:39:18 +00:00
Chris Lattner 09a32e42bd add a note 
llvm-svn: 34249
 2007-02-13 21:44:43 +00:00
Chris Lattner 89e5813312 add a note: we need whole-function selectiondags :) 
llvm-svn: 33252
 2007-01-16 06:39:48 +00:00
Reid Spencer 266e42b312 For PR950: 
This patch removes the SetCC instructions and replaces them with the ICmp
and FCmp instructions. The SetCondInst instruction has been removed and
been replaced with ICmpInst and FCmpInst.

llvm-svn: 32751
 2006-12-23 06:05:41 +00:00
Chris Lattner feeb9c7be5 Evan implemented the machineinstr improvements. 
The rot example works if the type is cast to ubyte.

Move sroa examples together and upgrade them to HEAD syntax.

llvm-svn: 32423
 2006-12-11 00:44:03 +00:00
Chris Lattner 4d475f6e6e add a note 
llvm-svn: 32347
 2006-12-08 02:01:32 +00:00
Chris Lattner 0d67dde00a done 
llvm-svn: 32013
 2006-11-29 07:21:46 +00:00
Chris Lattner 6dc22332bf add a note 
llvm-svn: 31719
 2006-11-14 01:57:53 +00:00
Nick Lewycky 0df2ada9d4 Cute example from Chris Lattner. 
llvm-svn: 31696
 2006-11-13 00:23:28 +00:00
Chris Lattner 4e03cb1945 add a note about viterbi 
llvm-svn: 31612
 2006-11-10 00:23:26 +00:00
Chris Lattner 7e885005ba add a note 
llvm-svn: 31477
 2006-11-06 21:26:49 +00:00
Chris Lattner 2048373e71 add a note 
llvm-svn: 31429
 2006-11-03 22:27:39 +00:00
Reid Spencer 7e80b0b31e For PR950: 
Make necessary changes to support DIV -> [SUF]Div. This changes llvm to
have three division instructions: signed, unsigned, floating point. The
bytecode and assembler are bacwards compatible, however.

llvm-svn: 31195
 2006-10-26 06:15:43 +00:00
Chris Lattner f054003ba7 new bad case 
llvm-svn: 31156
 2006-10-24 16:12:47 +00:00
Chris Lattner 3cbd1604f8 add a note about a general improvement to the code generator 
llvm-svn: 30642
 2006-09-28 06:01:17 +00:00
Chris Lattner f11327daab more notes 
llvm-svn: 30598
 2006-09-25 17:12:14 +00:00
Chris Lattner b94df039c0 item done 
llvm-svn: 30483
 2006-09-19 06:19:03 +00:00
Chris Lattner 4a13d3b391 This is closer to what we really want. 
llvm-svn: 30451
 2006-09-18 04:54:35 +00:00
Chris Lattner f7e3478745 add a note noticed through source inspection 
llvm-svn: 30418
 2006-09-16 23:57:51 +00:00
Chris Lattner c9dc375d3e add a nate note 
llvm-svn: 30399
 2006-09-15 20:31:36 +00:00
Chris Lattner ac40a81253 We compile this into: 
_swap_16:
        slwi r2, r3, 24
        rlwimi r2, r3, 8, 8, 15
        srwi r3, r2, 16
        blr

now.

llvm-svn: 29864
 2006-08-24 23:06:02 +00:00
Chris Lattner fb6bc15d5d Owen implemented this. 
llvm-svn: 29863
 2006-08-24 23:03:33 +00:00
Chris Lattner a5d4587296 Add a note 
llvm-svn: 28572
 2006-05-30 21:29:15 +00:00
Chris Lattner 80b0a70911 Add a note 
llvm-svn: 28424
 2006-05-21 03:57:07 +00:00
Chris Lattner 29d7bded45 Add a note 
llvm-svn: 28402
 2006-05-19 21:01:38 +00:00
Chris Lattner 240f846495 Move a target-independent note out of the X86 readme. 
llvm-svn: 28398
 2006-05-19 20:45:08 +00:00
Chris Lattner 4cda95b32f add a note 
llvm-svn: 28384
 2006-05-18 18:26:13 +00:00
Chris Lattner d1c3a067ee add a note 
llvm-svn: 27907
 2006-04-20 18:49:28 +00:00
Chris Lattner 7a29cf3c7f New note 
llvm-svn: 27337
 2006-04-02 01:47:20 +00:00