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3615 Commits

Author SHA1 Message Date
Dan Gohman
43b8fd728b Document that BasicAA respects noalias, while InterproceduralBasicAA 
does not.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@107546 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-07-02 23:52:36 +00:00
Dan Gohman
efca7f9681 Describe which dependencies are relevant to noalias, and document how 
AliasAnalyses have the choice to respect noalias.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@107544 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-07-02 23:46:54 +00:00
Dan Gohman
ff23535df6 Add some html anchors, to allow attributes to be linked to directly. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@107538 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-07-02 23:18:08 +00:00
Dan Gohman
1e109621f1 Reword the definition of the noalias attribute. The intention is for 
the noalias argument on function attributes be usable to model the
C99 restrict keyword on arguments, and to allow AliasAnalysis to
consider a noalias-attributed argument to be an "identified object".

To support this, refactor a new "based on" concept out of the current
pointer aliasing "associated" concept. This "based on" concept is very
similar to (though it is not identical with) the "based on" concept
in C99.

Also, reword the definition of NoAlias to more closely describe the
concept that the optimizer uses.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@107495 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-07-02 18:41:32 +00:00
Bill Wendling
5e721d7682 Implement the "linker_private_weak" linkage type. This will be used for 
Objective-C metadata types which should be marked as "weak", but which the
linker will remove upon final linkage. However, this linkage isn't specific to
Objective-C.

For example, the "objc_msgSend_fixup_alloc" symbol is defined like this:

      .globl l_objc_msgSend_fixup_alloc
      .weak_definition l_objc_msgSend_fixup_alloc
      .section __DATA, __objc_msgrefs, coalesced
      .align 3
l_objc_msgSend_fixup_alloc:
       .quad   _objc_msgSend_fixup
       .quad   L_OBJC_METH_VAR_NAME_1

This is different from the "linker_private" linkage type, because it can't have
the metadata defined with ".weak_definition".

Currently only supported on Darwin platforms.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@107433 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-07-01 21:55:59 +00:00
Bill Wendling
07d3177117 Revert r107205 and r107207. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@107215 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-06-29 22:34:52 +00:00
Bill Wendling
7645f14ee8 Improve explanation. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@107207 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-06-29 21:41:58 +00:00
Bill Wendling
207855cff9 Introducing the "linker_weak" linkage type. This will be used for Objective-C 
metadata types which should be marked as "weak", but which the linker will
remove upon final linkage. For example, the "objc_msgSend_fixup_alloc" symbol is
defined like this:

       .globl l_objc_msgSend_fixup_alloc
       .weak_definition l_objc_msgSend_fixup_alloc
       .section __DATA, __objc_msgrefs, coalesced
       .align 3
l_objc_msgSend_fixup_alloc:
        .quad   _objc_msgSend_fixup
        .quad   L_OBJC_METH_VAR_NAME_1

This is different from the "linker_private" linkage type, because it can't have
the metadata defined with ".weak_definition".


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@107205 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-06-29 21:24:00 +00:00
Dan Gohman
85dfca616a Add a blurb about -scev-aa. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@107080 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-06-28 22:09:52 +00:00
Dan Gohman
3f43dc3687 Document problems that I encountered when working on -scev-aa. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@106776 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-06-24 19:34:03 +00:00
Chris Lattner
d47397f6dd This makes example Makefile a lot more like actual 
lib/Transforms/Hello/Makefile, and prevents a lot of errors like "Assertion
`Inserted && "Pass registered multiple times!"' failed"

Patch by Gregory Petrosyan!


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@106471 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-06-21 20:36:09 +00:00
Eric Christopher
1f4a1493fb Remove isTwoAddress from llvm. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@106470 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-06-21 20:35:09 +00:00
Chris Lattner
6808cdc424 fix typos reported by Adam Warner! 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@106468 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-06-21 20:31:30 +00:00
Eric Christopher
69a462ef71 Another typo. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@106340 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-06-18 22:51:25 +00:00
Eric Christopher
6492a3561a Fix typo. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@106335 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-06-18 22:33:17 +00:00
Bruno Cardoso Lopes
6e0a99a7ab Teach tablegen how to inherit from classes in 'defm' definitions. 
The rule is simple: only inherit from a class list if they come
in the end, after the last multiclass.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@106305 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-06-18 19:53:41 +00:00
Dan Gohman
c22c0f37b4 Minor clarification. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@106234 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-06-17 19:23:50 +00:00
Bruno Cardoso Lopes
eba8f1893b For a tablegen expression such as !if(a,b,c), let 'a' 
be evaluated for 'bit' operators


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@106185 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-06-17 00:31:36 +00:00
Bruno Cardoso Lopes
e87de41189 let the '!eq' expression support 'int' and 'bit' types 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@106171 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-06-16 23:24:12 +00:00
Jakob Stoklund Olesen
8a3eab9b20 Remove the local register allocator. 
Please use the fast allocator instead.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@106051 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-06-15 21:58:33 +00:00
Eric Christopher
2214b81196 Update html tutorial docs to match api changes. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@105933 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-06-14 06:09:39 +00:00
Bruno Cardoso Lopes
ee65db3add Teach tablegen to allow "let" expressions inside multiclasses, 
providing more ways to factor out commonality from the records.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@105776 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-06-10 02:42:59 +00:00
Bruno Cardoso Lopes
270562b3d4 Teach tablegen to support 'defm' inside multiclasses. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@105519 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-06-05 02:11:52 +00:00
Devang Patel
80ecc153ea Update docs to reflect new DISubprogram elements. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@105495 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-06-04 22:49:55 +00:00
Rafael Espindola
b26f27969e Update the documentation, getCalleeSavedRegClasses is not required anymore. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@105323 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-06-02 14:03:11 +00:00
Nick Lewycky
9e130ce3aa Document aggregate operation constant expressions. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@105098 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-05-29 06:44:15 +00:00
Dale Johannesen
9d8d221a68 Fix Data Layout description of floating point. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@104993 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-05-28 18:54:47 +00:00
Dan Gohman
fe47aae6a8 Fix more whitespace to be consistent with AsmPrinter. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@104963 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-05-28 17:13:49 +00:00
Dan Gohman
3dfb3cfb38 Fix whitespace to be more consistent with AsmPrinter's style. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@104962 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-05-28 17:07:41 +00:00
Dan Gohman
f75a7d3fbf Eliminate the restriction that the array size in an alloca must be i32. 
This will help reduce the amount of casting required on 64-bit targets.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@104911 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-05-28 01:14:11 +00:00
Dan Gohman
31f1af118a Fix a missing quote. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@104750 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-05-26 21:56:15 +00:00
Jim Grosbach
90346e2261 Add entry for llvm.eh.sjlj.longjmp. PR4999. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@104703 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-05-26 16:21:41 +00:00
Chris Lattner
299f424f44 expand on the llvm ir bitcode dox. Patch by Peter Housel! 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@104391 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-05-21 22:20:54 +00:00
Tobias Grosser
0560ce471d Update autoconf/automake versions in the documentation to match the versions used in Autogen.sh 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@104113 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-05-19 07:00:17 +00:00
Duncan Sands
16d8f8bd91 I got tired of VISIBILITY_HIDDEN colliding with the gcc enum. Rename it 
to LLVM_LIBRARY_VISIBILITY and introduce LLVM_GLOBAL_VISIBILITY, which is
the opposite, for future use by dragonegg.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@103495 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-05-11 20:16:09 +00:00
Daniel Dunbar
c9d0c4e801 Test commit. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@103479 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-05-11 17:22:45 +00:00
Tanya Lattner
10934e881d Test commit. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@103478 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-05-11 16:47:42 +00:00
Tanya Lattner
e924ab5037 Test commit. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@103477 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-05-11 16:46:45 +00:00
Tobias Grosser
733783b27c Document graphviz passes for the (post) dominator tree. 
Add documentation for:
  -dot-dom
  -dot-dom-only
  -dot-postdom
  -dot-postdom-only
  -view-dom
  -view-dom-only
  -view-postdom
  -view-postdom-only

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@103251 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-05-07 09:33:18 +00:00
mike-m
e2c3a49c80 Revert r103213. It broke several sections of live website. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@103219 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-05-07 00:28:04 +00:00
mike-m
271cc67044 Disable man->postscript and man->pdf doc generation unless explicitly 
configured via --enable-doxygen. It seems some systems have broken pdfroff
so automatic use of it is not safe.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@103217 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-05-07 00:13:23 +00:00
mike-m
d0d425b285 Cleanup unneeded dirs after docs overhaul. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@103215 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-05-06 23:48:37 +00:00
mike-m
68cb31901c Overhauled llvm/clang docs builds. Closes PR6613. 
NOTE: 2nd part changeset for cfe trunk to follow.

*** PRE-PATCH ISSUES ADDRESSED

- clang api docs fail build from objdir
- clang/llvm api docs collide in install PREFIX/
- clang/llvm main docs collide in install
- clang/llvm main docs have full of hard coded destination
  assumptions and make use of absolute root in static html files;
  namely CommandGuide tools hard codes a website destination
  for cross references and some html cross references assume
  website root paths

*** IMPROVEMENTS

- bumped Doxygen from 1.4.x -> 1.6.3
- splits llvm/clang docs into 'main' and 'api' (doxygen) build trees
- provide consistent, reliable doc builds for both main+api docs
- support buid vs. install vs. website intentions
- support objdir builds
- document targets with 'make help'
- correct clean and uninstall operations
- use recursive dir delete only where absolutely necessary
- added call function fn.RMRF which safeguards against botched 'rm -rf';
  if any target (or any variable is evaluated) which attempts
  to remove any dirs which match a hard-coded 'safelist', a verbose
  error will be printed and make will error-stop.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@103213 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-05-06 23:45:43 +00:00
Chris Lattner
b7d0688195 Fix some ..'s 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@103134 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-05-05 23:29:09 +00:00
Chris Lattner
cd465012b3 one more thing. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@103024 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-05-04 18:16:00 +00:00
Chris Lattner
860e0b4c95 update instructions for llvm-gcc4, the brave new world! PR7037 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@103023 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-05-04 18:15:33 +00:00
Dan Gohman
7ae3ac831e Update one more 2.7 to 2.8. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@102978 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-05-03 23:52:21 +00:00
Dan Gohman
b44f6c6b6a Minimally update ReleaseNotes.html for 2.8 development; uncomment and 
update the big red warning at the top. Most of the old content remains
and awaits revision.

Clear out the API changes section, and start it up again with a
mention of the add->fadd transition.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@102977 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-05-03 23:51:05 +00:00
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 
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 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. 
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 2010-04-25 19:13:33 +00:00
Dan Gohman
698cbcb0a4 PHI nodes also do not necessarily return trap with a trap operand. 
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 2010-04-24 22:15:58 +00:00
Nick Lewycky
1f048649e3 Fix typo. 
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 2010-04-24 22:01:40 +00:00
Dan Gohman
27ef9976c2 Switch getelementptr inbounds and sdiv exact from undef to trap. 
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 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.


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


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 2010-04-22 17:39:38 +00:00
Chris Lattner
fb1a739202 two more projects. 
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 2010-04-22 17:28:36 +00:00
Chris Lattner
cd062cd54c add some notes from Matthieu Moy! 
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 2010-04-22 17:25:00 +00:00
Chris Lattner
ca73cea8a2 improve tblgen doc, pointed out by Zhongxing. 
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 2010-04-22 16:45:27 +00:00
Wesley Peck
1f433615b4 Fixing a typo in the "Clang project" section of the release notes. 
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 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. 
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 2010-04-22 13:53:54 +00:00
Wesley Peck
c0287baced Fixing small typos in the "New Useful APIs" section of the release notes. 
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 2010-04-22 13:50:46 +00:00
Wesley Peck
9e385b1367 Fixing small typos in the "ARM Target Improvements" section of the release notes. 
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 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. 
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 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. 
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 2010-04-22 13:28:34 +00:00
Gabor Greif
ed38745a2a <pre> seems to close <p> 
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 2010-04-22 10:25:23 +00:00
Gabor Greif
ee2187a38d the validator coughed up some problems, most of them fixed 
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 2010-04-22 10:21:43 +00:00
Gabor Greif
c8b3af9f5f shorten link 
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 2010-04-22 10:11:24 +00:00
Chris Lattner
f455529b9e static analyzer has its own section 
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 2010-04-22 06:39:56 +00:00
Chris Lattner
8cdd7939ad add mc and static analyzer blurbs. 
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 2010-04-22 06:38:11 +00:00
Chris Lattner
914ce46040 another checkpoint. 
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 2010-04-22 06:28:20 +00:00
Chris Lattner
7b91eda0de various updates. 
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 2010-04-22 05:41:35 +00:00