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3517 Commits

Author SHA1 Message Date
Dan Gohman
7c24ff12c4 Update this comment to note its relationship with the "happens-before" 
concept in the proposed memory model changes.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@102911 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-05-03 14:59:34 +00:00
Dan Gohman
45baf4191b Delete this comment. The behavior of struct loads and stores with 
respect to padding bytes isn't something that the dependence text
needs to spell out.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@102910 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-05-03 14:58:14 +00:00
Dan Gohman
b532816ac9 Describe invoke instruction dependencies. Generalize the text for 
terminator instructions so that it applies to all terminators with
multiple successors, including invoke.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@102909 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-05-03 14:55:22 +00:00
Dan Gohman
855abed3cb Say "operations" instead of "instructions", as nsw can be applied to 
constant expressions as well as instructions.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@102908 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-05-03 14:51:43 +00:00
Duncan Sands
57b6e9eb6c Remove the -enable-sjlj-eh option, which doesn't do anything. 
Remove the -enable-eh option which is only used by the JIT,
and replace it with -jit-enable-eh.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@102865 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-05-02 15:36:26 +00:00
David Chisnall
27195a5831 Fixed @ctor / @dtor the wrong way around in last commit. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@102741 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-04-30 19:27:35 +00:00
David Chisnall
e31e9966ec Added a brief explanation of @llvm.global_{c,d}tors. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@102740 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-04-30 19:23:49 +00:00
Dan Gohman
34b3d993e4 Rewrite the section on trap values to contain a generic description 
of dependence and define trap values in terms of dependence, instead
of trying to cover the concept with a flurry of ad-hoc rules.

The dependence model isn't complete yet, but it's already much more
rigorous than the description it replaces.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@102479 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-04-28 00:49:41 +00:00
Dan Gohman
1c70c00c28 Fix spelling errors. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@102478 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-04-28 00:36:01 +00:00
Chris Lattner
2d4b8ee1d9 further clarify alignment of globals, fix instcombine 
to not increase the alignment of globals with an assigned
alignment and section.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@102476 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-04-28 00:31:12 +00:00
Chris Lattner
ce99fa9e26 improve the global variable alignment description. 
it is not generally valid for targets to overalign
them when an alignment is specified.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@102474 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-04-28 00:13:42 +00:00
Chris Lattner
77640feed7 fix wordo 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@102418 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-04-27 07:28:11 +00:00
Chris Lattner
de076819e4 remove some comments. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@102417 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-04-27 06:57:10 +00:00
Dan Gohman
ae11c3f83e Integrate Jeffery Yasskin's suggestions with respect to 
traps flowing through memory references, add some text to
better cover phi nodes and externally-visible side effects,
add an example of instructions being control-dependent
on a trap value, and reword some of the existing trap rules.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@102399 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-04-26 23:36:52 +00:00
Jeffrey Yasskin
93e066d0e2 Consolidate the description of volatile operations, now that some of the 
intrinsics have volatile semantics in addition to the load and store
instructions.  


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@102384 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-04-26 21:21:24 +00:00
Dan Gohman
c30f6e1c89 Branching or switching on trap transfers imminent undefined behavior 
onto control-dependent instructions.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@102381 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-04-26 20:54:53 +00:00
Gabor Greif
28034cde44 add some typewriter tags 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@102378 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-04-26 20:46:03 +00:00
Dan Gohman
c68ce066a5 Fix HTML errors that Jeffery Yasskin noticed. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@102376 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-04-26 20:21:21 +00:00
Chris Lattner
095539f97c wrap some long lines. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@102354 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-04-26 17:42:18 +00:00
Chris Lattner
7c8e7965e1 add GHC, thanks to David Terei 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@102352 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-04-26 17:38:10 +00:00
Gabor Greif
e32adf53b2 another typo pointed out by sajd 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@102319 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-04-25 21:30:22 +00:00
Gabor Greif
1440dbe4c2 fix two typos pointed out by sajd 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@102318 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-04-25 21:27:54 +00:00
David Chisnall
8e0bd80e38 Added bullet about GNUstep Objective-C ABI support to the Clang section of the release notes. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@102309 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-04-25 19:13:33 +00:00
Dan Gohman
698cbcb0a4 PHI nodes also do not necessarily return trap with a trap operand. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@102278 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-04-24 22:15:58 +00:00
Nick Lewycky
1f048649e3 Fix typo. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@102276 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-04-24 22:01:40 +00:00
Dan Gohman
27ef9976c2 Switch getelementptr inbounds and sdiv exact from undef to trap. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@102175 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-04-23 15:23:32 +00:00
Dan Gohman
fff6c5332f Add an initial description of a new concept: trap values, and change 
the definition of the nsw and nuw flags to make use of it.

nsw was introduced to help optimizers answer yes to the following:

  // Can we change i from i32 to i64 to eliminate the cast inside the loop?
  for (int i = 0; i < n; ++i) A[i] *= 0.1;

  // Can we assume that this loop will eventually terminate?
  for (int i = 0; i <= n; ++i) A[i] *= 0.1;

In its current form, it isn't truly sufficient for either.

In the first case, if the increment overflows, it'll still have some
valid i32 value; sign-extending it will produce a value which is 33
homogeneous sign bits trailed by 31 independent undef bits. If i is
promoted to i64, it won't have those same values when it reaches that
point. (The compiler could recover here by reasoning about how i is
used by the load, but that's a lot more complicated and isn't always
possible.)

In the second case, there is no value for i which will be greater than
n, so having the increment return undef on overflow doesn't help.

Trap values are a formalization of some existing concepts that we have
about LLVM IR, and give the optimizers a better basis for answering yes
to both questions above.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@102140 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-04-22 23:14:21 +00:00
Chris Lattner
3a1d4cfc38 add macruby back 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@102132 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-04-22 21:34:16 +00:00
Dan Gohman
9c675f14c1 Add a blurb about the new LSR. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@102126 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-04-22 20:50:43 +00:00
Nick Lewycky
009364ebcf The -condprop pass has been deleted. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@102125 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-04-22 20:48:34 +00:00
Dan Gohman
d64d12dfcb The post-RA scheduler is currently off by default on x86. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@102124 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-04-22 20:47:28 +00:00
Douglas Gregor
f720a4edb0 Add some verbiage about Clang to the 2.7 release notes 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@102121 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-04-22 20:42:40 +00:00
Jim Grosbach
41a776631d Add mention of ARM atomic builtin support 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@102103 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-04-22 18:33:31 +00:00
Jim Grosbach
269e0fed84 Update ARM frame index scavenging description 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@102101 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-04-22 18:28:43 +00:00
Chris Lattner
cb28286b7b remove dupe 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@102100 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-04-22 18:26:17 +00:00
Chris Lattner
83cd35aff9 reword my incoherent babble into something that makes sense 
from Wesley Peck!


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@102096 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-04-22 17:39:38 +00:00
Chris Lattner
fb1a739202 two more projects. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@102095 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-04-22 17:28:36 +00:00
Chris Lattner
cd062cd54c add some notes from Matthieu Moy! 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@102093 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-04-22 17:25:00 +00:00
Chris Lattner
ca73cea8a2 improve tblgen doc, pointed out by Zhongxing. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@102072 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-04-22 16:45:27 +00:00
Wesley Peck
1f433615b4 Fixing a typo in the "Clang project" section of the release notes. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@102064 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-04-22 14:19:00 +00:00
Wesley Peck
a0c4484bce Small fix to the "Other Improvements and New Features" section of the release notes. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@102063 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-04-22 13:53:54 +00:00
Wesley Peck
c0287baced Fixing small typos in the "New Useful APIs" section of the release notes. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@102062 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-04-22 13:50:46 +00:00
Wesley Peck
9e385b1367 Fixing small typos in the "ARM Target Improvements" section of the release notes. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@102061 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-04-22 13:43:14 +00:00
Wesley Peck
640604ae63 Rewording the "generated debug information" paragraph in the "Interpreter and JIT Improvements" section of the release notes. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@102060 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-04-22 13:36:27 +00:00
Wesley Peck
68d1fe9700 Reworking the wording of the "target data string" paragraph in the "Optimizer Improvments" section of the release notes. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@102059 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-04-22 13:28:34 +00:00
Gabor Greif
ed38745a2a <pre> seems to close <p> 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@102057 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-04-22 10:25:23 +00:00
Gabor Greif
ee2187a38d the validator coughed up some problems, most of them fixed 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@102056 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-04-22 10:21:43 +00:00
Gabor Greif
c8b3af9f5f shorten link 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@102055 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-04-22 10:11:24 +00:00
Chris Lattner
f455529b9e static analyzer has its own section 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@102054 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-04-22 06:39:56 +00:00
Chris Lattner
8cdd7939ad add mc and static analyzer blurbs. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@102053 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-04-22 06:38:11 +00:00