Commit Graph

1728 Commits

Author SHA1 Message Date
Dan Gohman
6a551e73fd Change a C-style cast to const_cast, to avoid a -Wcast-qual warning.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@47437 91177308-0d34-0410-b5e6-96231b3b80d8
2008-02-21 17:33:24 +00:00
Nick Lewycky
39442afb36 Simplify this code, no functionality change.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@47434 91177308-0d34-0410-b5e6-96231b3b80d8
2008-02-21 09:14:53 +00:00
Nick Lewycky
3b71165b32 GlobalValues are Constants, remove redundant code. Also fix typo in a comment.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@47433 91177308-0d34-0410-b5e6-96231b3b80d8
2008-02-21 08:34:02 +00:00
Anton Korobeynikov
ae9f3a3b7c Unbreak build with gcc 4.3: provide missed includes and silence most annoying warnings.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@47367 91177308-0d34-0410-b5e6-96231b3b80d8
2008-02-20 11:08:44 +00:00
Nick Lewycky
178f20a685 Use getConstant for ConstantInts.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@47361 91177308-0d34-0410-b5e6-96231b3b80d8
2008-02-20 06:58:55 +00:00
Nick Lewycky
3e63076980 Add 'umax' similar to 'smax' SCEV. Closes PR2003.
Parse reversed smax and umax as smin and umin and express them with negative
or binary-not SCEVs (which are really just subtract under the hood).

Parse 'xor %x, -1' as (-1 - %x).

Remove dead code (ConstantInt::get always returns a ConstantInt).

Don't use getIntegerSCEV(-1, Ty). The first value is an int, then it gets
passed into a uint64_t. Instead, create the -1 directly from
ConstantInt::getAllOnesValue().


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@47360 91177308-0d34-0410-b5e6-96231b3b80d8
2008-02-20 06:48:22 +00:00
Duncan Sands
ec5ec88d15 Fix a compiler warning.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@47328 91177308-0d34-0410-b5e6-96231b3b80d8
2008-02-19 09:28:48 +00:00
Owen Anderson
851bfff50f In addition to arguments passed to it, memcpy (and all other calls) can ModRef pointers that alias their arguments as well. This fixes PR2057.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@47317 91177308-0d34-0410-b5e6-96231b3b80d8
2008-02-19 06:47:18 +00:00
Chris Lattner
bb494bcb0e don't bother calling getUnderlyingObject for non-pointers.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@47272 91177308-0d34-0410-b5e6-96231b3b80d8
2008-02-18 17:28:21 +00:00
Owen Anderson
ef562471ce Since we're not checking for the more general AllocationInst first, we need to explicitly check
that Object is an Argument before casting it to one.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@47268 91177308-0d34-0410-b5e6-96231b3b80d8
2008-02-18 10:11:00 +00:00
Owen Anderson
26d914ada3 This check is not correct for mallocs, so exclude them earlier.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@47263 91177308-0d34-0410-b5e6-96231b3b80d8
2008-02-18 09:11:02 +00:00
Owen Anderson
ae708a3d91 Fix a comment, and a bug where we weren't applying the tail call logic in cases that failed the first test.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@47253 91177308-0d34-0410-b5e6-96231b3b80d8
2008-02-18 03:52:21 +00:00
Owen Anderson
9aa7c35cee Fix bugs that Chris noticed in my last patch.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@47252 91177308-0d34-0410-b5e6-96231b3b80d8
2008-02-18 02:31:23 +00:00
Chris Lattner
0ab5a4ae55 bitcasts of pointers are always pointers.
If we see a memcpy of a pointer, make sure to check later
uses of the pointer as well.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@47250 91177308-0d34-0410-b5e6-96231b3b80d8
2008-02-18 02:11:28 +00:00
Owen Anderson
9b636cb338 Teach getModRefInfo that memcpy, memmove, and memset don't "capture" memory addresses.
Also, noalias arguments are be considered "like" stack allocated ones for this purpose, because
the only way they can be modref'ed is if they escape somewhere in the current function.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@47247 91177308-0d34-0410-b5e6-96231b3b80d8
2008-02-17 21:29:08 +00:00
Wojciech Matyjewicz
a65ee03bb2 Fix typo. Thanks to Duncan for noticing.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@47062 91177308-0d34-0410-b5e6-96231b3b80d8
2008-02-13 12:21:32 +00:00
Wojciech Matyjewicz
3a4cbe2a41 Add comments as per review feedback.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@47061 91177308-0d34-0410-b5e6-96231b3b80d8
2008-02-13 11:51:34 +00:00
Owen Anderson
30b4bd4d10 Re-apply the patch to improve the optimizations of memcpy's, with several
bugs fixed.  This now passes PPC bootstrap.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@47026 91177308-0d34-0410-b5e6-96231b3b80d8
2008-02-12 21:15:18 +00:00
Wojciech Matyjewicz
7b5b76835a Fix PR2002. Suppose n is the initial value for the induction
variable (with step 1) and m is its final value. Then, the correct trip 
count is SMAX(m,n)-n. Previously, we used SMAX(0,m-n), but m-n may 
overflow and can't in general be interpreted as signed.

Patch by Nick Lewycky.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@47007 91177308-0d34-0410-b5e6-96231b3b80d8
2008-02-12 15:09:36 +00:00
Wojciech Matyjewicz
a089b10421 If the LHS of the comparison is a loop-invariant we also want to move it
to the RHS. This simple change allows to compute loop iteration count 
for loops with condition similar to the one in the testcase (which seems 
to be quite common).


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@46959 91177308-0d34-0410-b5e6-96231b3b80d8
2008-02-11 18:37:34 +00:00
Wojciech Matyjewicz
e3320a1bcc Fix PR1798 - an error in the evaluation of SCEVAddRecExpr at an
arbitrary iteration.

The patch:
1) changes SCEVSDivExpr into SCEVUDivExpr,
2) replaces PartialFact() function with BinomialCoefficient(); the 
computations (essentially, the division) in BinomialCoefficient() are 
performed with the apprioprate bitwidth necessary to avoid overflow; 
unsigned division is used instead of the signed one.

Computations in BinomialCoefficient() require support from the code 
generator for APInts. Currently, we use a hack rounding up the 
neccessary bitwidth to the nearest power of 2. The hack is easy to turn 
off in future.

One remaining issue: we assume the divisor of the binomial coefficient 
formula can be computed accurately using 16 bits. It means we can handle 
AddRecs of length up to 9. In future, we should use APInts to evaluate 
the divisor.

Thanks to Nicholas for cooperation!


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@46955 91177308-0d34-0410-b5e6-96231b3b80d8
2008-02-11 11:03:14 +00:00
Wojciech Matyjewicz
3913187bf6 We should check that existing cast operation has the appropriate opcode before we reuse it.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@46908 91177308-0d34-0410-b5e6-96231b3b80d8
2008-02-09 18:30:13 +00:00
Tanya Lattner
63aa160b27 Throttle the non-local dependence analysis for basic blocks with more than 50 predecessors. Added command line option to play with this threshold.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@46790 91177308-0d34-0410-b5e6-96231b3b80d8
2008-02-06 00:54:55 +00:00
Owen Anderson
a8701a6c62 Fix an obscure read-after-free bug that Duncan found.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@46738 91177308-0d34-0410-b5e6-96231b3b80d8
2008-02-05 04:34:03 +00:00
Dan Gohman
fa9b80eb64 Avoid unnecessarily casting away const, fixing a FIXME.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@46591 91177308-0d34-0410-b5e6-96231b3b80d8
2008-01-31 01:05:10 +00:00
Owen Anderson
9a8ff8cd0f Fix an issue where, under very specific circumstances, memdep could end up dereferencing the end
of one of its internal maps.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@46541 91177308-0d34-0410-b5e6-96231b3b80d8
2008-01-30 01:24:05 +00:00
Chris Lattner
d087480166 getUnderlyingObject can return null, handle this.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@46318 91177308-0d34-0410-b5e6-96231b3b80d8
2008-01-24 19:07:10 +00:00
Chris Lattner
fd68750038 Teach basicaa that 'byval' arguments define a new memory location that
can't be aliased to other known objects.  This allows us to know that byval 
pointer args don't alias globals, etc.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@46315 91177308-0d34-0410-b5e6-96231b3b80d8
2008-01-24 18:00:32 +00:00
Nick Lewycky
aeb5e5cdb7 Don't be rude, emit debugging info where asked to.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@45485 91177308-0d34-0410-b5e6-96231b3b80d8
2008-01-02 02:49:20 +00:00
Chris Lattner
4ee451de36 Remove attribution from file headers, per discussion on llvmdev.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@45418 91177308-0d34-0410-b5e6-96231b3b80d8
2007-12-29 20:36:04 +00:00
Chris Lattner
fc643c5e88 remove attribution from lib Makefiles.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@45415 91177308-0d34-0410-b5e6-96231b3b80d8
2007-12-29 20:09:26 +00:00
Gordon Henriksen
da1435f86e Adding bindings for memory buffers and module providers. Switching
to exceptions rather than variants for error handling in Ocaml.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@45226 91177308-0d34-0410-b5e6-96231b3b80d8
2007-12-19 22:30:40 +00:00
Dan Gohman
ded2b0d0fb Add explicit keywords, and fix a minor typo that they uncovered.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@45034 91177308-0d34-0410-b5e6-96231b3b80d8
2007-12-14 15:41:34 +00:00
Wojciech Matyjewicz
4ba8cfc5a4 Make these loops follow GetGEPOperands() behavior.
Let: %q = GEP %p, X, ...
If %p is a GEP, we can chase baseptr further, only if X==0.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@44999 91177308-0d34-0410-b5e6-96231b3b80d8
2007-12-13 16:22:58 +00:00
Duncan Sands
7915cbee4d Revert r44626, which turned off the use of readonly
and readnone for functions with bodies because it
broke llvm-gcc-4.2 bootstrap.  It turns out that,
because of LLVM's array_ref hack, gcc was computing
pure/const attributes wrong (now fixed by turning
off the gcc ipa-pure-const pass).


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@44937 91177308-0d34-0410-b5e6-96231b3b80d8
2007-12-12 16:01:40 +00:00
Chris Lattner
7f135cc802 Fix a bug in my previous patch, thanks to Jay Foad for
pointing this out and correcting the patch!


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@44907 91177308-0d34-0410-b5e6-96231b3b80d8
2007-12-12 03:56:54 +00:00
Daniel Berlin
3a3f163ba6 Changes from Curtis Dunham implementing lazy cycle detection algorithm.
Changes from me implementing different way of representing points-to anything.
Changes from me that improve slightly on LCD.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@44895 91177308-0d34-0410-b5e6-96231b3b80d8
2007-12-12 00:37:04 +00:00
Chris Lattner
1afab9c1e0 Implement constant folding if vector<->vector bitcasts where the number
of source/dest elements changes.  This implements
test/Transforms/InstCombine/bitcast-vector-fold.ll


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@44855 91177308-0d34-0410-b5e6-96231b3b80d8
2007-12-11 07:29:44 +00:00
Chris Lattner
f286f6fd93 Fix PR1850 by removing an unsafe transformation from VMCore/ConstantFold.cpp.
Reimplement the xform in Analysis/ConstantFolding.cpp where we can use
targetdata to validate that it is safe.  While I'm in there, fix some const
correctness issues and generalize the interface to the "operand folder".


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@44817 91177308-0d34-0410-b5e6-96231b3b80d8
2007-12-10 22:53:04 +00:00
Chris Lattner
f88380ba2c Fix PR1782, patch by Wojtek Matyjewicz!
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@44733 91177308-0d34-0410-b5e6-96231b3b80d8
2007-12-09 07:35:13 +00:00
Owen Anderson
5fc4abac3d Fix several cache coherence bugs in MemDep/GVN that were found. Also add some (disabled) debugging code
to make such problems easier to diagnose in the future, written by Duncan Sands.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@44695 91177308-0d34-0410-b5e6-96231b3b80d8
2007-12-08 01:37:09 +00:00
Duncan Sands
5d84afdc83 Commit 44487 broke bootstrap of llvm-gcc-4.2. It is
not yet clear why, but in the meantime work around the
problem by making less use of readnone/readonly info.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@44626 91177308-0d34-0410-b5e6-96231b3b80d8
2007-12-05 21:03:28 +00:00
Duncan Sands
a3355ffb3d Rather than having special rules like "intrinsics cannot
throw exceptions", just mark intrinsics with the nounwind
attribute.  Likewise, mark intrinsics as readnone/readonly
and get rid of special aliasing logic (which didn't use
anything more than this anyway).


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@44544 91177308-0d34-0410-b5e6-96231b3b80d8
2007-12-03 20:06:50 +00:00
Duncan Sands
dff6710717 Integrate the readonly/readnone logic more deeply
into alias analysis.  This meant updating the API
which now has versions of the getModRefBehavior,
doesNotAccessMemory and onlyReadsMemory methods
which take a callsite parameter.  These should be
used unless the callsite is not known, since in
general they can do a better job than the versions
that take a function.  Also, users should no longer
call the version of getModRefBehavior that takes
both a function and a callsite.  To reduce the
chance of misuse it is now protected.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@44487 91177308-0d34-0410-b5e6-96231b3b80d8
2007-12-01 07:51:45 +00:00
Chris Lattner
cd883f203d chain update requests properly.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@44460 91177308-0d34-0410-b5e6-96231b3b80d8
2007-11-30 18:52:58 +00:00
Duncan Sands
afa3b6da11 Add some convenience methods for querying attributes, and
use them.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@44403 91177308-0d34-0410-b5e6-96231b3b80d8
2007-11-28 17:07:01 +00:00
Duncan Sands
dc024674ff Fix PR1146: parameter attributes are longer part of
the function type, instead they belong to functions
and function calls.  This is an updated and slightly
corrected version of Reid Spencer's original patch.
The only known problem is that auto-upgrading of
bitcode files doesn't seem to work properly (see
test/Bitcode/AutoUpgradeIntrinsics.ll).  Hopefully
a bitcode guru (who might that be? :) ) will fix it.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@44359 91177308-0d34-0410-b5e6-96231b3b80d8
2007-11-27 13:23:08 +00:00
Owen Anderson
d735ee85db Make LoopInfoBase more generic, in preparation for having MachineLoopInfo. This involves a small interface change.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@44348 91177308-0d34-0410-b5e6-96231b3b80d8
2007-11-27 03:43:35 +00:00
Owen Anderson
97d4e51df1 Fix a silly bug that Nicholas noticed.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@44324 91177308-0d34-0410-b5e6-96231b3b80d8
2007-11-26 03:27:38 +00:00
Owen Anderson
00a6d1448d Allow GVN to eliminate read-only function calls when it can detect that they are redundant.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@44323 91177308-0d34-0410-b5e6-96231b3b80d8
2007-11-26 02:26:36 +00:00