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ae11c3f83e
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572 Commits

Author SHA1 Message Date
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
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
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
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
Duncan Sands
83821c8941 Pointed out by housel on #llvm. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@101395 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-04-15 20:35:54 +00:00
Chris Lattner
ff35c3f0bf typo 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@100738 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-04-08 00:54:34 +00:00
Chris Lattner
9f636de348 document isvolatile etc. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@100737 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-04-08 00:53:57 +00:00
Mon P Wang
e88909ba72 Update langref for memcpy, memmove, and memset 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@100611 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-04-07 06:35:53 +00:00
Chris Lattner
cf9a415182 Have the inst emitter add the !srcloc mdnode to the machine instr. 
Have the asmprinter use the mdnode to scavenge a source location if
present.  Document this nonsense in langref.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@100607 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-04-07 05:38:05 +00:00
Chris Lattner
0cec9c85ee various cleanups from daniel 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@98528 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-03-15 04:12:21 +00:00
Chris Lattner
82c3dc6347 tidy up and expound more on how half-float works. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@98524 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-03-14 23:03:31 +00:00
Anton Korobeynikov
f02e73018f Document fp16 intrinsics 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@98505 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-03-14 18:42:47 +00:00
Chris Lattner
2968943463 add support, testcases, and dox for the new GHC calling 
convention.  Patch by David Terei!



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@98212 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-03-11 00:22:57 +00:00
Evan Cheng
dc444e9a23 Add documentation on sibling call optimization. Rename tailcall2.ll test to sibcall.ll. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@97980 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-03-08 21:05:02 +00:00
Devang Patel
e1d50cd5e4 Add metadata example. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@97764 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-03-04 23:44:48 +00:00
Chris Lattner
0724fbd6e9 attributes are not part of types anymore, patch by James Woodyatt! 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@97557 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-03-02 06:36:51 +00:00
Dan Gohman
fbbee8d7f9 PerformTailCallOpt was renamed to GuaranteedTailCallOpt to 
better reflect its meaning, now that tail call optimizations
are done by default in some cases.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@97530 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-03-02 01:08:11 +00:00
Dan Gohman
b55a1ee36c Fix spelling. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@97447 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-03-01 17:41:39 +00:00
Bill Wendling
7c78dbb493 Fix HTML. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@97170 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-02-25 21:23:24 +00:00
Dan Gohman
2eddfef0df Fix a typo. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@97144 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-02-25 16:51:31 +00:00
Dan Gohman
ff3ef32c35 Clarify the description of pointer types, and move the 
address space content to its own paragraph.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@97143 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-02-25 16:50:07 +00:00
Dan Gohman
fdf2e8cced Update LangRef to match the code; pointers default to being 64-bit. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@96873 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-02-23 02:44:03 +00:00
David Greene
8939b0d8a9 Add support for emitting non-temporal stores for DAGs marked 
non-temporal.  Fix from r96241 for botched encoding of MOVNTDQ.

Add documentation for !nontemporal metadata.

Add a simpler movnt testcase.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@96386 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-02-16 20:50:18 +00:00
Chris Lattner
fdfeb6976f Add support for a union type in LLVM IR. Patch by Talin! 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@96011 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-02-12 20:49:41 +00:00
Charles Davis
1e063d14df Add a new function attribute, 'alignstack'. It will indicate (when the backends 
implement support for it) that the stack should be forcibly realigned in the
prologue (and the process reversed in the epilogue).


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@95945 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-02-12 00:31:15 +00:00
Jakob Stoklund Olesen
570a4a5d9c Reintroduce the InlineHint function attribute. 
This time it's for real! I am going to hook this up in the frontends as well.

The inliner has some experimental heuristics for dealing with the inline hint.
When given a -respect-inlinehint option, functions marked with the inline
keyword are given a threshold just above the default for -O3.

We need some experiments to determine if that is the right thing to do.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@95466 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-02-06 01:16:28 +00:00
Chris Lattner
e6a5ddd0fa move "Metadata Nodes and Metadata Strings" section to the right place in the 
document and edit it.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@93559 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-01-15 21:50:19 +00:00
Eric Christopher
606a1d1f59 Remove the InlineHint attribute. There are no current or planned 
users.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@93558 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-01-15 21:36:30 +00:00
Chris Lattner
df7a680964 mention that unwind isn't to be trusted, patch by Dustin Laurence 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@93518 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-01-15 18:08:37 +00:00
Devang Patel
cd1fd251eb Add top level section for named metadata. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@93172 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-01-11 19:35:55 +00:00
Jeffrey Yasskin
7a088cf27a Improve unclear bits and inaccuracies in structure and insertvalue 
documentation.

Patch by Dustin Laurence!


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@93170 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-01-11 19:19:26 +00:00
Jeffrey Yasskin
95fa80af6f Clarify the requirements for a "tail call" to actually be optimized into a 
jump.  People clearly weren't finding the extra requirements in
CodeGenerator.html.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@93070 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-01-09 19:44:16 +00:00
Chris Lattner
873187c042 improve documentation for linkonce to be less confusing. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@93066 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-01-09 19:15:14 +00:00
Eric Christopher
d003c5b3d7 Grammar thinko. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@93027 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-01-08 21:42:39 +00:00
Devang Patel
3e30c2a3c5 NamedMDNode is a collection MDNodes. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@92761 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-01-05 20:41:31 +00:00
Eric Christopher
8295a0a991 Update docs for bitcode changes. For object size checking we won't 
work with partial objects so just count the type as a boolean. Update
appropriately.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@91954 91177308-0d34-0410-b5e6-96231b3b80d8
 2009-12-23 00:29:49 +00:00
Eric Christopher
6c7e8a02d8 More updates to objectsize intrinsic docs. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@90644 91177308-0d34-0410-b5e6-96231b3b80d8
 2009-12-05 02:46:03 +00:00
Eric Christopher
0e97e799d7 Update per Bill's comments. Work in progress. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@90271 91177308-0d34-0410-b5e6-96231b3b80d8
 2009-12-01 22:28:41 +00:00
Eric Christopher
0e671491d7 First pass at llvm.objectsize documentation. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@90116 91177308-0d34-0410-b5e6-96231b3b80d8
 2009-11-30 08:03:53 +00:00
Duncan Sands
d40d14e98c Vector types are no longer required to have a power-of-two length. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@90004 91177308-0d34-0410-b5e6-96231b3b80d8
 2009-11-27 13:38:03 +00:00
Duncan Sands
65687f76c0 These code generator limitations have been removed. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@90003 91177308-0d34-0410-b5e6-96231b3b80d8
 2009-11-27 12:33:22 +00:00
Dan Gohman
7657f6b002 The inbounds keyword isn't relevant to overindexing of 
static array types. Thanks to Duncan for pointing this out!


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@86576 91177308-0d34-0410-b5e6-96231b3b80d8
 2009-11-09 19:01:53 +00:00
Dan Gohman
9384438071 Remove the "special case" for zero-length arrays, and rephrase this 
paragraph to be more precise.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@86572 91177308-0d34-0410-b5e6-96231b3b80d8
 2009-11-09 18:40:39 +00:00
Chris Lattner
e82bdc4809 add the ability for TargetData to return information about legal integer 
datatypes on a given CPU.  This is intended to allow instcombine and other
transformations to avoid converting big sequences of operations to an
inconvenient width, and will help clean up after SRoA.  See also "Adding 
legal integer sizes to TargetData" on Feb 1, 2009 on llvmdev, and PR3451.

Comments welcome.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@86370 91177308-0d34-0410-b5e6-96231b3b80d8
 2009-11-07 09:35:34 +00:00
Bill Wendling
21c346e171 Add missing end-tag. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@85769 91177308-0d34-0410-b5e6-96231b3b80d8
 2009-11-02 00:25:26 +00:00
Bill Wendling
f82d40a33c Some formatting changes. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@85768 91177308-0d34-0410-b5e6-96231b3b80d8
 2009-11-02 00:24:16 +00:00
Chris Lattner
cdfc940912 Revert 85678/85680. The decision is to stay with the current form of 
indirectbr, thus we don't need "blockaddr(@func, null)".  Eliminate it
for simplicity.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@85699 91177308-0d34-0410-b5e6-96231b3b80d8
 2009-11-01 01:27:45 +00:00