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274 Commits

Author SHA1 Message Date
Chris Lattner
82318209c4 reassociate should do this. 
llvm-svn: 94374
 2010-01-24 20:17:09 +00:00
Chris Lattner
e328ab9a00 add a note. 
llvm-svn: 94373
 2010-01-24 20:01:41 +00:00
Chris Lattner
8909d5aca5 implement a simple instcombine xform that has been in the 
readme forever.

llvm-svn: 94318
 2010-01-23 18:49:30 +00:00
Chris Lattner
fdc6162f82 add some notes, making posix-memalign be nocapture would be an easy improvement. 
llvm-svn: 94312
 2010-01-23 17:59:23 +00:00
Eli Friedman
0aade63ca6 Add some potentially interesting transformations to README. 
llvm-svn: 93797
 2010-01-18 22:36:59 +00:00
Duncan Sands
de0adbdf25 Fix a README item: have functionattrs look through selects and 
phi nodes when deciding which pointers point to local memory.
I actually checked long ago how useful this is, and it isn't
very: it hardly ever fires in the testsuite, but since Chris
wants it here it is!

llvm-svn: 92836
 2010-01-06 15:37:47 +00:00
Duncan Sands
4ef1119d94 Partially address a README by having functionattrs consider calls to 
memcpy, memset and other intrinsics that only access their arguments
to be readnone if the intrinsic's arguments all point to local memory.
This improves the testcase in the README to readonly, but it could in
theory be made readnone, however this would involve more sophisticated
analysis that looks through the memcpy.

llvm-svn: 92829
 2010-01-06 08:45:52 +00:00
Chris Lattner
ce3f5f3448 implement an instcombine xform needed by clang's codegen 
on the example in PR4216.  This doesn't trigger in the testsuite,
so I'd really appreciate someone scrutinizing the logic for
correctness.

llvm-svn: 92458
 2010-01-04 06:03:59 +00:00
Chris Lattner
44298d184a Teach codegen to lower llvm.powi to an efficient (but not optimal) 
multiply sequence when the power is a constant integer.  Before, our
codegen for std::pow(.., int) always turned into a libcall, which was
really inefficient.

This should also make many gfortran programs happier I'd imagine.

llvm-svn: 92388
 2010-01-01 03:32:16 +00:00
Chris Lattner
0ea2e3d444 update this. To take the next step, llvm.powi should be generalized to work 
on integers as well and codegen should lower them to branch trees.

llvm-svn: 92382
 2010-01-01 01:29:26 +00:00
Eli Friedman
392adbdd7d More info on this transformation. 
llvm-svn: 91230
 2009-12-12 23:23:43 +00:00
Eli Friedman
38a7d3b32e Remove some stuff that's already implemented. Also, remove the note about 
merging x >u 5 and x <s 20 because it's impossible to implement.

llvm-svn: 91228
 2009-12-12 21:41:48 +00:00
Chris Lattner
b46655e25c expand note. 
llvm-svn: 90429
 2009-12-03 07:43:46 +00:00
Chris Lattner
6b86618a2b add a note 
llvm-svn: 90428
 2009-12-03 07:41:54 +00:00
Chris Lattner
40d74cea6b update and consolidate the load pre notes. 
llvm-svn: 90050
 2009-11-29 02:19:52 +00:00
Chris Lattner
0df78ea645 add a deadargelim note. 
llvm-svn: 90009
 2009-11-27 17:12:30 +00:00
Chris Lattner
c0b92ff385 This testcase is actually only partially redundant, and requires 
the FIXME I added yesterday to be implemented.

llvm-svn: 90008
 2009-11-27 16:53:57 +00:00
Chris Lattner
225a88f4ab this (and probably several others) are now done. 
llvm-svn: 89982
 2009-11-27 00:35:04 +00:00
Chris Lattner
4824ebfded Teach memdep to phi translate bitcasts. This allows us to compile 
the example in GCC PR16799 to:

LBB1_2:                                                     ## %bb1
	movl	%eax, %eax
	subq	%rax, %rdi
	movq	%rdi, (%rcx)
	movl	(%rdi), %eax
	testl	%eax, %eax
	je	LBB1_2

instead of:

LBB1_2:                                                     ## %bb1
	movl	(%rdi), %ecx
	subq	%rcx, %rdi
	movq	%rdi, (%rax)
	cmpl	$0, (%rdi)
	je	LBB1_2

llvm-svn: 89978
 2009-11-26 23:41:07 +00:00
Chris Lattner
9c88c96b3f Teach basicaa that x|c == x+c when the c bits of x are clear. This 
allows us to compile the example in readme.txt into:

LBB1_1:                                                     ## %bb
	movl	4(%rdx,%rax), %ecx
	movl	%ecx, %esi
	imull	(%rdx,%rax), %esi
	imull	%esi, %ecx
	movl	%esi, 8(%rdx,%rax)
	imull	%ecx, %esi
	movl	%ecx, 12(%rdx,%rax)
	movl	%esi, 16(%rdx,%rax)
	imull	%ecx, %esi
	movl	%esi, 20(%rdx,%rax)
	addq	$16, %rax
	cmpq	$4000, %rax
	jne	LBB1_1

instead of:

LBB1_1: 
	movl	(%rdx,%rax), %ecx
	imull	4(%rdx,%rax), %ecx
	movl	%ecx, 8(%rdx,%rax)
	imull	4(%rdx,%rax), %ecx
	movl	%ecx, 12(%rdx,%rax)
	imull	8(%rdx,%rax), %ecx
	movl	%ecx, 16(%rdx,%rax)
	imull	12(%rdx,%rax), %ecx
	movl	%ecx, 20(%rdx,%rax)
	addq	$16, %rax
	cmpq	$4000, %rax
	jne	LBB1_1

GCC (4.2) doesn't seem to be able to eliminate the loads in this 
testcase either, it generates:

L2:
	movl	(%rdx), %eax
	imull	4(%rdx), %eax
	movl	%eax, 8(%rdx)
	imull	4(%rdx), %eax
	movl	%eax, 12(%rdx)
	imull	8(%rdx), %eax
	movl	%eax, 16(%rdx)
	imull	12(%rdx), %eax
	movl	%eax, 20(%rdx)
	addl	$4, %ecx
	addq	$16, %rdx
	cmpl	$1002, %ecx
	jne	L2

llvm-svn: 89952
 2009-11-26 16:26:43 +00:00
Chris Lattner
677b93d4c8 teach basicaa that A[i] != A[i+1]. 
llvm-svn: 89951
 2009-11-26 16:18:10 +00:00
Chris Lattner
0b862edca3 update some notes slightly 
llvm-svn: 89913
 2009-11-26 01:51:18 +00:00
Nick Lewycky
b73208f294 Add a complex missed optimization opportunity I came across while investigating 
bug 5438.

llvm-svn: 88855
 2009-11-15 17:51:23 +00:00
Chris Lattner
0dd2fe1e1e another const prop failure. 
llvm-svn: 86848
 2009-11-11 17:54:02 +00:00
Chris Lattner
20da198cb6 add a note 
llvm-svn: 86847
 2009-11-11 17:51:27 +00:00
Chris Lattner
bc9996444e add a note 
llvm-svn: 86756
 2009-11-10 23:47:45 +00:00
Chris Lattner
67aac80393 I did this a week or two ago 
llvm-svn: 86754
 2009-11-10 23:40:49 +00:00
Nick Lewycky
2b3ac2b1a7 Improve tail call elimination to handle the switch statement. 
llvm-svn: 86403
 2009-11-07 21:10:15 +00:00
Chris Lattner
7f61fbfcca add a note from PR5313 
llvm-svn: 86146
 2009-11-05 18:19:19 +00:00
Bill Wendling
8f96a88125 Add new note. 
llvm-svn: 85341
 2009-10-27 23:30:07 +00:00
Bill Wendling
cb9a2f20d5 Move and clarify note. 
llvm-svn: 85334
 2009-10-27 22:48:31 +00:00
Chris Lattner
81c06b943c this is done. 
llvm-svn: 85041
 2009-10-25 06:17:51 +00:00
Chris Lattner
d1dbcae98f some stuff is done, we still have constantexpr simplification to do. 
llvm-svn: 84943
 2009-10-23 07:00:55 +00:00
Chris Lattner
2363ec8194 IPSCCP is missing stuff. 
llvm-svn: 84725
 2009-10-21 01:10:37 +00:00
Chris Lattner
d24ead5c1e add a note 
llvm-svn: 82442
 2009-09-21 06:04:07 +00:00
Chris Lattner
64e3a9984b one case handled, expanded another testcase inline. 
llvm-svn: 82427
 2009-09-21 02:53:57 +00:00
Chris Lattner
5963cbb9c9 update an entry, delete an entry which has been fixed. 
llvm-svn: 82398
 2009-09-20 17:37:38 +00:00
Nick Lewycky
ecb17d4648 Peer through zext and sext to eliminate them when it is safe to do so. 
llvm-svn: 82389
 2009-09-20 07:31:25 +00:00
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
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
Chris Lattner
a1df6908d2 minor updates 
llvm-svn: 35143
 2007-03-18 22:41:33 +00:00
Nick Lewycky
04ecc07c25 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
e7ff3305d6 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
67bdb3aae8 add a note 
llvm-svn: 34249
 2007-02-13 21:44:43 +00:00
Chris Lattner
06f52d3e1e add a note: we need whole-function selectiondags :) 
llvm-svn: 33252
 2007-01-16 06:39:48 +00:00
Reid Spencer
4428c3483b 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
48e3989461 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
02a2f33279 add a note 
llvm-svn: 32347
 2006-12-08 02:01:32 +00:00
Chris Lattner
e72dff706e done 
llvm-svn: 32013
 2006-11-29 07:21:46 +00:00
Chris Lattner
8913d79def add a note 
llvm-svn: 31719
 2006-11-14 01:57:53 +00:00
Nick Lewycky
f4f28f415d Cute example from Chris Lattner. 
llvm-svn: 31696
 2006-11-13 00:23:28 +00:00
Chris Lattner
48d2b0af37 add a note about viterbi 
llvm-svn: 31612
 2006-11-10 00:23:26 +00:00
Chris Lattner
c3e6822514 add a note 
llvm-svn: 31477
 2006-11-06 21:26:49 +00:00
Chris Lattner
2cb1391e09 add a note 
llvm-svn: 31429
 2006-11-03 22:27:39 +00:00
Reid Spencer
6833ffe8b8 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
efee605648 new bad case 
llvm-svn: 31156
 2006-10-24 16:12:47 +00:00
Chris Lattner
6dc95b7b26 add a note about a general improvement to the code generator 
llvm-svn: 30642
 2006-09-28 06:01:17 +00:00
Chris Lattner
2281c3f6ca more notes 
llvm-svn: 30598
 2006-09-25 17:12:14 +00:00
Chris Lattner
2b076f26b7 item done 
llvm-svn: 30483
 2006-09-19 06:19:03 +00:00
Chris Lattner
a1349de598 This is closer to what we really want. 
llvm-svn: 30451
 2006-09-18 04:54:35 +00:00
Chris Lattner
563785bc55 add a note noticed through source inspection 
llvm-svn: 30418
 2006-09-16 23:57:51 +00:00
Chris Lattner
bf14089e11 add a nate note 
llvm-svn: 30399
 2006-09-15 20:31:36 +00:00
Chris Lattner
b3ab5fac28 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
b8292ee9e7 Owen implemented this. 
llvm-svn: 29863
 2006-08-24 23:03:33 +00:00
Chris Lattner
a5c50baaf5 Add a note 
llvm-svn: 28572
 2006-05-30 21:29:15 +00:00
Chris Lattner
9d6103087a Add a note 
llvm-svn: 28424
 2006-05-21 03:57:07 +00:00
Chris Lattner
ec58aa014f Add a note 
llvm-svn: 28402
 2006-05-19 21:01:38 +00:00
Chris Lattner
9c8f608215 Move a target-independent note out of the X86 readme. 
llvm-svn: 28398
 2006-05-19 20:45:08 +00:00
Chris Lattner
9c7cab7478 add a note 
llvm-svn: 28384
 2006-05-18 18:26:13 +00:00
Chris Lattner
2c1c3896ed add a note 
llvm-svn: 27907
 2006-04-20 18:49:28 +00:00
Chris Lattner
2a24d68439 New note 
llvm-svn: 27337
 2006-04-02 01:47:20 +00:00
Chris Lattner
894231e63e ADd a note 
llvm-svn: 27324
 2006-04-01 04:08:29 +00:00
Evan Cheng
403cd8f787 An entry about packed type alignments. 
llvm-svn: 27321
 2006-03-31 22:35:14 +00:00
Chris Lattner
045f6bf0ef add a note 
llvm-svn: 27076
 2006-03-24 19:59:17 +00:00