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2011-08-26Don't sink landingpad instructions during ind-var simplification.Bill Wendling
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@138651 91177308-0d34-0410-b5e6-96231b3b80d8
2011-08-26Use %% for literals in RUN lines.Andrew Trick
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@138647 91177308-0d34-0410-b5e6-96231b3b80d8
2011-08-26SimplifyCFG: If we have a PHI node that can evaluate to NULL and do a load ↵Benjamin Kramer
or store to the address returned by the PHI node then we can consider this incoming value as dead and remove the edge pointing there, unless there are instructions that can affect control flow executed in between. In theory this could be extended to other instructions, eg. division by zero, but it's likely that it will "miscompile" some code because people depend on div by zero not trapping. NULL pointer dereference usually leads to a crash so we should be on the safe side. This shrinks the size of a Release clang by 16k on x86_64. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@138618 91177308-0d34-0410-b5e6-96231b3b80d8
2011-08-24Implement Constant::isAllOnesValue(). Fix ConstantFolding to use the new api.Nadav Rotem
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@138469 91177308-0d34-0410-b5e6-96231b3b80d8
2011-08-23Revert "Address Duncan's CR request:"Eric Christopher
This reverts commit 20a05be15ea5271ab6185b83200fa88263362400. (svn rev 138340) Conflicts: test/Transforms/InstCombine/bitcast.ll git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@138366 91177308-0d34-0410-b5e6-96231b3b80d8
2011-08-23Fix a typo in the test from the previous commit.Nadav Rotem
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@138342 91177308-0d34-0410-b5e6-96231b3b80d8
2011-08-23Address Duncan's CR request:Nadav Rotem
1. Cleanup the tests in ConstantFolding.cpp 2. Implement isAllOnes for Constant, ConstantFP, ConstantVector git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@138340 91177308-0d34-0410-b5e6-96231b3b80d8
2011-08-22Constant pointers to objects don't need reference counting.Dan Gohman
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@138242 91177308-0d34-0410-b5e6-96231b3b80d8
2011-08-22Make a few tests slightly more strict.Dan Gohman
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@138241 91177308-0d34-0410-b5e6-96231b3b80d8
2011-08-20Add constant folding support for bitcasts of splat vectors to integers.Nadav Rotem
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@138206 91177308-0d34-0410-b5e6-96231b3b80d8
2011-08-19Add file.Eric Christopher
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@138083 91177308-0d34-0410-b5e6-96231b3b80d8
2011-08-19Track a retain+release nesting level independently of theDan Gohman
known-incremented level, because the two concepts can be used to prove the saftey of a retain+release removal in different ways. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@138016 91177308-0d34-0410-b5e6-96231b3b80d8
2011-08-17Atomic load/store handling for the passes using memdep (GVN, DSE, memcpyopt).Eli Friedman
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@137888 91177308-0d34-0410-b5e6-96231b3b80d8
2011-08-17Silly mistake from r137777; restore significant isStructTy() checks. While ↵Eli Friedman
here, be a bit more defensive with unknown instructions. Fixes PR10687. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@137836 91177308-0d34-0410-b5e6-96231b3b80d8
2011-08-16An additional atomic test; related to r137662.Eli Friedman
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@137786 91177308-0d34-0410-b5e6-96231b3b80d8
2011-08-16A bunch of misc fixes to SCCPSolver::ResolvedUndefsIn, including a fix to stopEli Friedman
making random bad assumptions about instructions which are not explicitly listed. Includes fix for rdar://9956541, a version of "undef ^ undef should return 0 because it's easier than arguing with users". git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@137777 91177308-0d34-0410-b5e6-96231b3b80d8
2011-08-16Minor bug in SCCP found by inspection. (I don't think it's possible to hit ↵Eli Friedman
this with a normal pass pipeline, but fixing for completeness.) git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@137755 91177308-0d34-0410-b5e6-96231b3b80d8
2011-08-16Fix test.Eli Friedman
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@137703 91177308-0d34-0410-b5e6-96231b3b80d8
2011-08-16Revert a bit of r137667; the logic in question can safely handle atomic ↵Eli Friedman
load/store. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@137702 91177308-0d34-0410-b5e6-96231b3b80d8
2011-08-16Migrate this test from llvm/test/FrontendC++/ptr-to-method-devirt.cpp andEric Christopher
FileCheckize. It is more properly an optimizer test. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@137700 91177308-0d34-0410-b5e6-96231b3b80d8
2011-08-15Update SimplifyCFG for atomic operations.Eli Friedman
This commit includes a mention of the landingpad instruction, but it's not changing the behavior around it. I think the current behavior is correct, though. Bill, can you double-check that? git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@137691 91177308-0d34-0410-b5e6-96231b3b80d8
2011-08-15Add comments and test for atomic load/store and mem2reg.Eli Friedman
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@137690 91177308-0d34-0410-b5e6-96231b3b80d8
2011-08-15Update instcombine for atomic load/store.Eli Friedman
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@137664 91177308-0d34-0410-b5e6-96231b3b80d8
2011-08-15Atomic load/store support in LICM.Eli Friedman
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@137648 91177308-0d34-0410-b5e6-96231b3b80d8
2011-08-15Add an ipsccp test. Migrated from test/FrontendC++.Eric Christopher
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@137646 91177308-0d34-0410-b5e6-96231b3b80d8
2011-08-14This transform is not safe. Thanks to Eli for pointing that out!Nick Lewycky
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@137575 91177308-0d34-0410-b5e6-96231b3b80d8
2011-08-14Don't attempt to add 'nsw' when intermediate instructions had no such guarantee.Nick Lewycky
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@137572 91177308-0d34-0410-b5e6-96231b3b80d8
2011-08-14Teach instcombine to preserve the nsw bit by doing an after-the-fact analysisNick Lewycky
when combining add and sub instructions. Patch by Pranav Bhandarkar! git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@137570 91177308-0d34-0410-b5e6-96231b3b80d8
2011-08-12Move "atomic" and "volatile" designations on instructions after the opcodeEli Friedman
of the instruction. Note that this change affects the existing non-atomic load and store instructions; the parser now accepts both forms, and the change is noted in the release notes. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@137527 91177308-0d34-0410-b5e6-96231b3b80d8
2011-08-12Don't convert objc_autoreleaseReturnValue to objc_autorelease if the resultDan Gohman
is returned through a bitcast. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@137402 91177308-0d34-0410-b5e6-96231b3b80d8
2011-08-12Don't let arbitrary calls disrupt nested retain+release pairs ifDan Gohman
the retains and releases all use the same SSA pointer value. Also, don't let CFG hazards disrupt nested retain+release pair optimizations. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@137399 91177308-0d34-0410-b5e6-96231b3b80d8
2011-08-11A slew of unit tests for the recent LoopInfo::updateUnloop featureAndrew Trick
checked in at r137276 and r137341. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@137385 91177308-0d34-0410-b5e6-96231b3b80d8
2011-08-11Allow loop unrolling to get known trip counts from ScalarEvolution.Andrew Trick
SCEV unrolling can unroll loops with arbitrary induction variables. It is a prerequisite for -disable-iv-rewrite performance. It is also easily handles loops of arbitrary structure including multiple exits and is generally more robust. This is under a temporary option to avoid affecting default behavior for the next couple of weeks. It is needed so that I can checkin unit tests for updateUnloop. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@137384 91177308-0d34-0410-b5e6-96231b3b80d8
2011-08-10Invoke SimplifyIndVar when we partially unroll a loop. Fixes PR10534.Andrew Trick
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@137203 91177308-0d34-0410-b5e6-96231b3b80d8
2011-08-10Fix the LoopUnroller to handle nontrivial loops and partial unrolling.Andrew Trick
These are not individual bug fixes. I had to rewrite a good chunk of the unroller to make it sane. I think it was getting lucky on trivial completely unrolled loops with no early exits. I included some fairly simple unit tests for partial unrolling. I didn't do much stress testing, so it may not be perfect, but should be usable now. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@137190 91177308-0d34-0410-b5e6-96231b3b80d8
2011-08-09Tidy up these testcases to look more like real code does.Dan Gohman
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@137085 91177308-0d34-0410-b5e6-96231b3b80d8
2011-08-06Made SCEV's UDiv expressions more canonical. When dividing aAndrew Trick
recurrence, the initial values low bits can sometimes be ignored. To take advantage of this, added FoldIVUser to IndVarSimplify to fold an IV operand into a udiv/lshr if the operator doesn't affect the result. -indvars -disable-iv-rewrite now transforms i = phi i4 i1 = i0 + 1 idx = i1 >> (2 or more) i4 = i + 4 into i = phi i4 idx = i0 >> ... i4 = i + 4 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@137013 91177308-0d34-0410-b5e6-96231b3b80d8
2011-08-03Remove the LowerSetJmp pass. It wasn't used effectively by any of the targets.Bill Wendling
This is some of my original LLVM code. *wipes tear* git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@136821 91177308-0d34-0410-b5e6-96231b3b80d8
2011-08-03SCEV: Use AssertingVH to catch dangling BasicBlock* when passes forgetAndrew Trick
to notify SCEV of a change. Add forgetLoop in a couple of those places. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@136797 91177308-0d34-0410-b5e6-96231b3b80d8
2011-08-03fix PR10286, a problem with the .ll printer handling block addresses that ↵Chris Lattner
are out-of-scope. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@136768 91177308-0d34-0410-b5e6-96231b3b80d8
2011-08-03Fix logical error when detecting lifetime intrinsics.Nick Lewycky
Don't replace a gep/bitcast with 'undef' because that will form a "free(undef)" which in turn means "unreachable". What we wanted was a no-op. Instead, analyze the whole tree and look for all the instructions we need to delete first, then delete them second, not relying on the use_list to stay consistent. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@136752 91177308-0d34-0410-b5e6-96231b3b80d8
2011-08-02Teach InstCombine that lifetime intrincs aren't a real user on the result of aNick Lewycky
malloc call. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@136732 91177308-0d34-0410-b5e6-96231b3b80d8
2011-08-02Lifetime intrinsics on undef are dead.Nick Lewycky
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@136722 91177308-0d34-0410-b5e6-96231b3b80d8
2011-08-02Remove empty test.Benjamin Kramer
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@136675 91177308-0d34-0410-b5e6-96231b3b80d8
2011-08-02Revert r136503 and r136480 in an effort to fix non-determinism in the ↵Owen Anderson
llvm-gcc buildbots on i386. Devang is looking into the root cause. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@136674 91177308-0d34-0410-b5e6-96231b3b80d8
2011-07-31Add a small gep optimization I noticed was missing while reading some IL.Rafael Espindola
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@136585 91177308-0d34-0410-b5e6-96231b3b80d8
2011-07-29Clean up debug info after reassociation.Devang Patel
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@136480 91177308-0d34-0410-b5e6-96231b3b80d8
2011-07-29Make sure to correctly clear the exact/nuw/nsw flags off of shifts when they ↵Eli Friedman
are combined together. <rdar://problem/9859829> git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@136435 91177308-0d34-0410-b5e6-96231b3b80d8
2011-07-27Teach the ConstantMerge pass about alignment. Fixes PR10514!Nick Lewycky
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@136250 91177308-0d34-0410-b5e6-96231b3b80d8
2011-07-25Finish adding support for lifetime intrinsics to SROA. Fixes PR10121!Nick Lewycky
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@136008 91177308-0d34-0410-b5e6-96231b3b80d8
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