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152 Commits

Author SHA1 Message Date
Owen Anderson
36c4debc94 Fix PR8247: JumpThreading can cause a block to become unreachable while still having predecessor, if it is part of a self-loop. 
Because of this, we cannot use the Simplify* APIs, as they can assert-fail on unreachable code.  Since it's not easy to determine
if a given threading will cause a block to become unreachable, simply defer simplifying simplification to later InstCombine and/or
DCE passes.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@115082 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-09-29 20:34:41 +00:00
Owen Anderson
c809d90bca Remove the option to disable LazyValueInfo in JumpThreading, as it is now 
on by default and has received significant testing.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@113852 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-09-14 20:57:41 +00:00
Chris Lattner
bdabacdcca Change lower atomic pass to use IntrinsicInst to simplify it a bit. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@113114 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-09-05 20:10:47 +00:00
Chris Lattner
906a675db8 eliminate some non-obvious casts. UndefValue isa Constant. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@113113 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-09-05 20:03:09 +00:00
Duncan Sands
fc6e29d4ab Reapply commit 112699, speculatively reverted by echristo, since 
I'm sure it is harmless.  Original commit message:
If PrototypeValue is erased in the middle of using the SSAUpdator
then the SSAUpdator may access freed memory.  Instead, simply pass
in the type and name explicitly, which is all that was used anyway.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@112810 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-09-02 08:14:03 +00:00
Owen Anderson
9bfa6fec06 JumpThreading keeps LazyValueInfo up to date, so we don't need to rerun it 
if we schedule another LVI-using pass afterwards.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@112722 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-09-01 18:27:22 +00:00
Eric Christopher
adc581f5cb Speculatively revert 112699 and 112702, they seem to be causing 
self host errors on clang-x86-64.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@112719 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-09-01 17:29:10 +00:00
Duncan Sands
4d588bceb0 If PrototypeValue is erased in the middle of using the SSAUpdator 
then the SSAUpdator may access freed memory.  Instead, simply pass
in the type and name explicitly, which is all that was used anyway.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@112699 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-09-01 10:29:33 +00:00
Owen Anderson
0eb355ab6b More cleanups of my JumpThreading transforms, including extracting some duplicated code into a helper function. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@112634 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-08-31 20:26:04 +00:00
Owen Anderson
9ba353627a Add an RAII helper to make cleanup of the RecursionSet more fool-proof. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@112628 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-08-31 19:24:27 +00:00
Owen Anderson
c1bdac66ff Refactor my fix for PR5652 to terminate the predecessor lookups after the first failure. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@112620 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-08-31 18:48:48 +00:00
Owen Anderson
cb21190cbd More Chris-inspired JumpThreading fixes: use ConstantExpr to correctly constant-fold undef, and be more careful with its return value. 
This actually exposed an infinite recursion bug in ComputeValueKnownInPredecessors which theoretically already existed (in JumpThreading's
handling of and/or of i1's), but never manifested before.  This patch adds a tracking set to prevent this case.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@112589 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-08-31 07:36:34 +00:00
Owen Anderson
327ca7bec2 Re-apply r112539, being more careful to respect the return values of the constant folding methods. Additionally, 
use the ConstantExpr::get*() methods to simplify some constant folding.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@112550 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-08-30 23:22:36 +00:00
Owen Anderson
d930f205db Revert r112539. It accidentally introduced a miscompilation. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@112543 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-08-30 22:33:41 +00:00
Owen Anderson
1e35610f20 Fixes and cleanups pointed out by Chris. In general, be careful to handle 0 results from ComputeValueKnownInPredecessors 
(indicating undef), and re-use existing constant folding APIs.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@112539 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-08-30 22:07:52 +00:00
Owen Anderson
fc2fb17fb7 Fix typos in comments. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@112286 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-08-27 20:32:56 +00:00
Owen Anderson
660cab32fe Use LVI to eliminate conditional branches where we've tested a related condition previously. Update tests for this change. 
This fixes PR5652.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@112270 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-08-27 17:12:29 +00:00
Owen Anderson
62efd3b385 Make JumpThreading smart enough to properly thread StrSwitch when it's compiled with clang++. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@112198 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-08-26 17:40:24 +00:00
Owen Anderson
53c36c41ae Turn LVI on, previously detected failures should be fixed now. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@111923 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-08-24 17:21:18 +00:00
Owen Anderson
b6ad691ad7 Turn LVI back off, I have a testcase now. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@111834 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-08-23 19:59:27 +00:00
Owen Anderson
0e2c359a3e Re-enable LazyValueInfo. Monitoring for failures. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@111816 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-08-23 18:12:23 +00:00
Owen Anderson
684d8d5b50 Disable LVI while I evaluate a failure. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@111551 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-08-19 19:47:08 +00:00
Owen Anderson
f2d197b77a Tentatively enabled LVI by default. I'll be monitoring for any failures. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@111543 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-08-19 19:04:40 +00:00
Owen Anderson
00ac77ef88 Inform LazyValueInfo whenever a block is deleted, to avoid dangling pointer issues. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@111382 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-08-18 18:39:01 +00:00
Chris Lattner
2fa7b48eb5 Fix PR7755: knowing something about an inval for a pred 
from the LHS should disable reconsidering that pred on the
RHS.  However, knowing something about the pred on the RHS
shouldn't disable subsequent additions on the RHS from
happening.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@111349 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-08-18 03:14:36 +00:00
Owen Anderson
90c579de5a Reapply r110396, with fixes to appease the Linux buildbot gods. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@110460 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-08-06 18:33:48 +00:00
Owen Anderson
1f74590e9d Revert r110396 to fix buildbots. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@110410 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-08-06 00:23:35 +00:00
Owen Anderson
9ccaf53ada Don't use PassInfo* as a type identifier for passes. Instead, use the address of the static 
ID member as the sole unique type identifier.  Clean up APIs related to this change.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@110396 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-08-05 23:42:04 +00:00
Owen Anderson
f35b08db50 Give JumpThreading+LVI a long-form cl::opt so that it's easier to toggle the default. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@110384 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-08-05 22:11:31 +00:00
Owen Anderson
cfa7fb6df5 Add an initial implementation of LazyValueInfo updating for JumpThreading. Disabled for now. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@109424 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-07-26 18:48:03 +00:00
Owen Anderson
d13db2c59c Fix batch of converting RegisterPass<> to INTIALIZE_PASS(). 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@109045 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-07-21 22:09:45 +00:00
Gabor Greif
ee1f44fba3 cache results of operator* 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@108142 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-07-12 14:10:24 +00:00
Chris Lattner
0a96144aac if jump threading is able to infer interesting values on both 
the LHS and RHS of an and/or instruction, don't multiply add
known predecessor values.  This fixes the crash on testcase
from PR7498


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@108114 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-07-12 00:47:34 +00:00
Chris Lattner
e58867e55e jump threading can't split a critical edge from an indirectbr. This 
fixes PR7356.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@105950 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-06-14 19:45:43 +00:00
Dan Gohman
dd9344f3fa Move FindAvailableLoadedValue isSafeToLoadUnconditionally out of 
lib/Transforms/Utils and into lib/Analysis so that Analysis passes
can use them.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@104949 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-05-28 16:19:17 +00:00
Chris Lattner
6f285d2105 fix PR6743, a case where we'd delete an instruction before using it 
in some cases.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@100937 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-04-10 18:26:57 +00:00
Duncan Sands
1df9859c40 There are two ways of checking for a given type, for example isa<PointerType>(T) 
and T->isPointerTy().  Convert most instances of the first form to the second form.
Requested by Chris.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@96344 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-02-16 11:11:14 +00:00
Duncan Sands
b0bc6c361d Uniformize the names of type predicates: rather than having isFloatTy and 
isInteger, we now have isFloatTy and isIntegerTy.  Requested by Chris!


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@96223 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-02-15 16:12:20 +00:00
Chris Lattner
1e452650c6 Make jump threading honor x|undef -> true and x&undef -> false, 
instead of considering x|undef -> x, which may not be true.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@95850 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-02-11 04:40:44 +00:00
Chris Lattner
d668839cb9 third bug from PR6119: the xor dupe extension allows 
for arbitrary terminators in predecessors, don't assume
it is a conditional or uncond branch.  The testcase shows
an example where they can happen with switches.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@94323 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-01-23 19:21:31 +00:00
Chris Lattner
2dd7657a5b add an early out to ProcessBranchOnXOR to speed it up, 
handle the case when we can infer an input to the xor
from all inputs that agree, instead of going into an
infinite loop.  Another part of PR6199


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@94321 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-01-23 19:16:25 +00:00
Chris Lattner
8231fd1e6c fix a crash in jump threading, PR6119 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@94319 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-01-23 18:56:07 +00:00
Chris Lattner
972a46c96a 1) Use the new SimplifyInstructionsInBlock routine instead of the copy 
in JT.

2) When cloning blocks for PHI or xor conditions, use
instsimplify to simplify the code as we go.  This allows us to 
squish common cases early in JT which opens up opportunities for
subsequent iterations, and allows it to completely simplify the
testcase.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@93253 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-01-12 20:41:47 +00:00
Chris Lattner
797c440caf tidy up 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@93222 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-01-12 02:07:50 +00:00
Chris Lattner
2249a0b1bd Teach jump threading to duplicate small blocks when the branch 
condition is a xor with a phi node.  This eliminates nonsense
like this from 176.gcc in several places:

 LBB166_84:
        testl   %eax, %eax
-       setne   %al
-       xorb    %cl, %al
-       notb    %al
-       testb   $1, %al
-       je      LBB166_85
+       je      LBB166_69
+       jmp     LBB166_85

This is rdar://7391699



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@93221 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-01-12 02:07:17 +00:00
Chris Lattner
77beb479f5 some cleanup, and make it obvious that ProcessJumpOnPHI only works 
on branches by renaming it and checking for a branch at the call site.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@93208 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-01-11 23:41:09 +00:00
Benjamin Kramer
66b581ef49 Use a do-while loop instead of while + boolean. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@92912 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-01-07 13:50:07 +00:00
David Greene
fe7fe6603f Change errs() to dbgs(). 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@92614 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-01-05 01:27:19 +00:00
Chris Lattner
5660846f15 Metadata.h doesn't need to include ValueHandle.h anymore. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@92211 91177308-0d34-0410-b5e6-96231b3b80d8
 2009-12-28 08:20:46 +00:00
Chris Lattner
08bc2701a2 fix PR5698 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@90708 91177308-0d34-0410-b5e6-96231b3b80d8
 2009-12-06 17:17:23 +00:00