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151 Commits

Author SHA1 Message Date
Chris Lattner e6214557e7 Change lower atomic pass to use IntrinsicInst to simplify it a bit. 
llvm-svn: 113114
 2010-09-05 20:10:47 +00:00
Chris Lattner 05ef361b5e eliminate some non-obvious casts. UndefValue isa Constant. 
llvm-svn: 113113
 2010-09-05 20:03:09 +00:00
Duncan Sands 6778149f7e 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.

llvm-svn: 112810
 2010-09-02 08:14:03 +00:00
Owen Anderson 73f988cafa JumpThreading keeps LazyValueInfo up to date, so we don't need to rerun it 
if we schedule another LVI-using pass afterwards.

llvm-svn: 112722
 2010-09-01 18:27:22 +00:00
Eric Christopher a5d315c665 Speculatively revert 112699 and 112702, they seem to be causing 
self host errors on clang-x86-64.

llvm-svn: 112719
 2010-09-01 17:29:10 +00:00
Duncan Sands f7b18437b5 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.

llvm-svn: 112699
 2010-09-01 10:29:33 +00:00
Owen Anderson 3c84ecb067 More cleanups of my JumpThreading transforms, including extracting some duplicated code into a helper function. 
llvm-svn: 112634
 2010-08-31 20:26:04 +00:00
Owen Anderson 6fdcb172a9 Add an RAII helper to make cleanup of the RecursionSet more fool-proof. 
llvm-svn: 112628
 2010-08-31 19:24:27 +00:00
Owen Anderson cd4de7f399 Refactor my fix for PR5652 to terminate the predecessor lookups after the first failure. 
llvm-svn: 112620
 2010-08-31 18:48:48 +00:00
Owen Anderson 3997a07fb9 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.

llvm-svn: 112589
 2010-08-31 07:36:34 +00:00
Owen Anderson c910acb54a 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.

llvm-svn: 112550
 2010-08-30 23:22:36 +00:00
Owen Anderson 1ddcbbe49c Revert r112539. It accidentally introduced a miscompilation. 
llvm-svn: 112543
 2010-08-30 22:33:41 +00:00
Owen Anderson 75f6037c7c 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.

llvm-svn: 112539
 2010-08-30 22:07:52 +00:00
Owen Anderson 99d4cb861b Fix typos in comments. 
llvm-svn: 112286
 2010-08-27 20:32:56 +00:00
Owen Anderson 6ebbd92380 Use LVI to eliminate conditional branches where we've tested a related condition previously. Update tests for this change. 
This fixes PR5652.

llvm-svn: 112270
 2010-08-27 17:12:29 +00:00
Owen Anderson bd2ecc7e68 Make JumpThreading smart enough to properly thread StrSwitch when it's compiled with clang++. 
llvm-svn: 112198
 2010-08-26 17:40:24 +00:00
Owen Anderson 7c853e877e Turn LVI on, previously detected failures should be fixed now. 
llvm-svn: 111923
 2010-08-24 17:21:18 +00:00
Owen Anderson 6ffa3f2aea Turn LVI back off, I have a testcase now. 
llvm-svn: 111834
 2010-08-23 19:59:27 +00:00
Owen Anderson 630add39a6 Re-enable LazyValueInfo. Monitoring for failures. 
llvm-svn: 111816
 2010-08-23 18:12:23 +00:00
Owen Anderson aac8cbb261 Disable LVI while I evaluate a failure. 
llvm-svn: 111551
 2010-08-19 19:47:08 +00:00
Owen Anderson 5c87dd55d3 Tentatively enabled LVI by default. I'll be monitoring for any failures. 
llvm-svn: 111543
 2010-08-19 19:04:40 +00:00
Owen Anderson 208636fa33 Inform LazyValueInfo whenever a block is deleted, to avoid dangling pointer issues. 
llvm-svn: 111382
 2010-08-18 18:39:01 +00:00
Chris Lattner 3c603024bb 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.

llvm-svn: 111349
 2010-08-18 03:14:36 +00:00
Owen Anderson a7aed18624 Reapply r110396, with fixes to appease the Linux buildbot gods. 
llvm-svn: 110460
 2010-08-06 18:33:48 +00:00
Owen Anderson bda59bd247 Revert r110396 to fix buildbots. 
llvm-svn: 110410
 2010-08-06 00:23:35 +00:00
Owen Anderson 755aceb5d0 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.

llvm-svn: 110396
 2010-08-05 23:42:04 +00:00
Owen Anderson 4674dd6cf5 Give JumpThreading+LVI a long-form cl::opt so that it's easier to toggle the default. 
llvm-svn: 110384
 2010-08-05 22:11:31 +00:00
Owen Anderson aa7f66ba67 Add an initial implementation of LazyValueInfo updating for JumpThreading. Disabled for now. 
llvm-svn: 109424
 2010-07-26 18:48:03 +00:00
Owen Anderson a57b97e7e7 Fix batch of converting RegisterPass<> to INTIALIZE_PASS(). 
llvm-svn: 109045
 2010-07-21 22:09:45 +00:00
Gabor Greif a5fa885d47 cache results of operator* 
llvm-svn: 108142
 2010-07-12 14:10:24 +00:00
Chris Lattner bbc25ff5cc 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

llvm-svn: 108114
 2010-07-12 00:47:34 +00:00
Chris Lattner 329ea064ed jump threading can't split a critical edge from an indirectbr. This 
fixes PR7356.

llvm-svn: 105950
 2010-06-14 19:45:43 +00:00
Dan Gohman 826bdf8c10 Move FindAvailableLoadedValue isSafeToLoadUnconditionally out of 
lib/Transforms/Utils and into lib/Analysis so that Analysis passes
can use them.

llvm-svn: 104949
 2010-05-28 16:19:17 +00:00
Chris Lattner 9ae28b141f fix PR6743, a case where we'd delete an instruction before using it 
in some cases.

llvm-svn: 100937
 2010-04-10 18:26:57 +00:00
Duncan Sands 19d0b47b1f 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.

llvm-svn: 96344
 2010-02-16 11:11:14 +00:00
Duncan Sands 9dff9bec31 Uniformize the names of type predicates: rather than having isFloatTy and 
isInteger, we now have isFloatTy and isIntegerTy.  Requested by Chris!

llvm-svn: 96223
 2010-02-15 16:12:20 +00:00
Chris Lattner d924f63692 Make jump threading honor x|undef -> true and x&undef -> false, 
instead of considering x|undef -> x, which may not be true.

llvm-svn: 95850
 2010-02-11 04:40:44 +00:00
Chris Lattner 29b15c5cfd 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.

llvm-svn: 94323
 2010-01-23 19:21:31 +00:00
Chris Lattner ba2d0b89ff 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

llvm-svn: 94321
 2010-01-23 19:16:25 +00:00
Chris Lattner de5ab4860f fix a crash in jump threading, PR6119 
llvm-svn: 94319
 2010-01-23 18:56:07 +00:00
Chris Lattner 573da8ac90 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.

llvm-svn: 93253
 2010-01-12 20:41:47 +00:00
Chris Lattner af7855d571 tidy up 
llvm-svn: 93222
 2010-01-12 02:07:50 +00:00
Chris Lattner eb73bdb2e1 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

llvm-svn: 93221
 2010-01-12 02:07:17 +00:00
Chris Lattner 6a19ed0b86 some cleanup, and make it obvious that ProcessJumpOnPHI only works 
on branches by renaming it and checking for a branch at the call site.

llvm-svn: 93208
 2010-01-11 23:41:09 +00:00
Benjamin Kramer 76e2766442 Use a do-while loop instead of while + boolean. 
llvm-svn: 92912
 2010-01-07 13:50:07 +00:00
David Greene 1efdb45562 Change errs() to dbgs(). 
llvm-svn: 92614
 2010-01-05 01:27:19 +00:00
Chris Lattner f8d22fc77d Metadata.h doesn't need to include ValueHandle.h anymore. 
llvm-svn: 92211
 2009-12-28 08:20:46 +00:00
Chris Lattner 6d6f10fe91 fix PR5698 
llvm-svn: 90708
 2009-12-06 17:17:23 +00:00
Chris Lattner 3c9aca9079 fix PR5640 by tracking whether a block is the header of a loop more 
precisely, which prevents us from infinitely peeling the loop.

llvm-svn: 90211
 2009-12-01 06:04:43 +00:00
Chris Lattner 9d9812a636 make PRE of loads preserve the alignment of the moved load instruction. 
llvm-svn: 88865
 2009-11-15 19:58:31 +00:00