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2011-08-30When walking backwards to eliminate final stores to allocas at the end of a ↵Owen Anderson
function, encountering an unrelated store should not cause us to give up like encountering a load does. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@138809 91177308-0d34-0410-b5e6-96231b3b80d8
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
2011-08-25LSR wants to split the landing pad's critical edge. Let it do it, but use theBill Wendling
proper function to do it. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@138550 91177308-0d34-0410-b5e6-96231b3b80d8
2011-08-25When inserting new instructions, use getFirstInsertionPt instead ofBill Wendling
getFirstNonPHI so that it will skip over the landingpad instructions as well. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@138537 91177308-0d34-0410-b5e6-96231b3b80d8
2011-08-24Skip the landingpad instruction when determining the insertion point.Bill Wendling
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@138481 91177308-0d34-0410-b5e6-96231b3b80d8
2011-08-24Use getFirstInsertionPt instead of getFirstNonPHI so that it skips to the properBill Wendling
insertion place. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@138473 91177308-0d34-0410-b5e6-96231b3b80d8
2011-08-22Add a comment.Dan Gohman
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@138243 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
2011-08-19The landingpad instruction isn't dead simply because it's value isn't used.Bill Wendling
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@138102 91177308-0d34-0410-b5e6-96231b3b80d8
2011-08-19Make a bunch of symbols private.Benjamin Kramer
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@138025 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
2011-08-18Use 'getFirstInsertionPt' when trying to insert new instructions during LICM.Bill Wendling
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@138008 91177308-0d34-0410-b5e6-96231b3b80d8
2011-08-18Make it clear that this code is iterating in reverse order through the array.Dan Gohman
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@137985 91177308-0d34-0410-b5e6-96231b3b80d8
2011-08-18Dramatically speedup codegen prepare by a) avoiding use of dominator tree ↵Devang Patel
and b) doing a separate pass over dbg.value instructions. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@137908 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
2011-08-17Disable PRE for landing pads.Bill Wendling
PRE needs the landing pads to have their critical edges split. Doing this for a landing pad is non-trivial. Abandon the attempt to perform PRE when we come across a landing pad. (Reviewed by Owen!) git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@137876 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
2011-08-16A 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
2011-08-16Use the getFirstInsertionPt() method instead of getFirstNonPHI + an 'isa<>'Bill Wendling
check for a LandingPadInst. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@137745 91177308-0d34-0410-b5e6-96231b3b80d8
2011-08-15In places where it's using "getFirstNonPHI", skip the landingpad instruction ↵Bill Wendling
if necessary. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@137679 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
2011-08-15Skip the insertion iterator past the landingpad instruction if there.Bill Wendling
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@137626 91177308-0d34-0410-b5e6-96231b3b80d8
2011-08-12Initial commit of the 'landingpad' instruction.Bill Wendling
This implements the 'landingpad' instruction. It's used to indicate that a basic block is a landing pad. There are several restrictions on its use (see LangRef.html for more detail). These restrictions allow the exception handling code to gather the information it needs in a much more sane way. This patch has the definition, implementation, C interface, parsing, and bitcode support in it. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@137501 91177308-0d34-0410-b5e6-96231b3b80d8
2011-08-12Silence a bunch (but not all) "variable written but not read" warningsDuncan Sands
when building with assertions disabled. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@137460 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
2011-08-12Use an actual reverse-CFG reverse-postorder for the bottom-up traversal,Dan Gohman
rather than plain postorder, so that CFG constructs like single-exit loops are reliably visited in a sensible order. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@137398 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
2011-08-11Fix typos in comments, and delete an unused function.Dan Gohman
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@137352 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
2011-08-10Cleanup. Make ScalarEvolution an explicit argument of theAndrew Trick
SimplifyIndVar utility since it is required. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@137202 91177308-0d34-0410-b5e6-96231b3b80d8
2011-08-10Added a SimplifyIndVar utility to simplify induction variable usersAndrew Trick
based on ScalarEvolution without changing the induction variable phis. This utility is the main tool of IndVarSimplifyPass, but the pass also restructures induction variables in strange ways that are sensitive to pass ordering. This provides a way for other loop passes to simplify new uses of induction variables created during transformation. The utility may be used by any pass that preserves ScalarEvolution. Soon LoopUnroll will use it. The net effect in this checkin is to cleanup the IndVarSimplify pass by factoring out the SimplifyIndVar algorithm into a standalone utility. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@137197 91177308-0d34-0410-b5e6-96231b3b80d8
2011-08-09Representation of 'atomic load' and 'atomic store' in IR.Eli Friedman
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@137170 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
2011-08-04Fix an obvious type. Patch by Ivan Krasin.Evan Cheng
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@136900 91177308-0d34-0410-b5e6-96231b3b80d8
2011-08-02Add new atomic instructions to SCCP. No functional change, but stops debug ↵Eli Friedman
spam. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@136723 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 the 'resume' instruction for the new EH rewrite.Bill Wendling
This adds the 'resume' instruction class, IR parsing, and bitcode reading and writing. The 'resume' instruction resumes propagation of an existing (in-flight) exception whose unwinding was interrupted with a 'landingpad' instruction (to be added later). git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@136589 91177308-0d34-0410-b5e6-96231b3b80d8
2011-07-30Revert r136253, r136263, r136269, r136313, r136325, r136326, r136329, r136338,Bill Wendling
r136339, r136341, r136369, r136387, r136392, r136396, r136429, r136430, r136444, r136445, r136446, r136253 pending review. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@136556 91177308-0d34-0410-b5e6-96231b3b80d8
2011-07-29Clear DbgValues in the end.Devang Patel
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@136503 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
2011-07-29Misc optimizer+codegen work for 'cmpxchg' and 'atomicrmw'. They appear to beEli Friedman
working on x86 (at least for trivial testcases); other architectures will need more work so that they actually emit the appropriate instructions for orderings stricter than 'monotonic'. (As far as I can tell, the ARM, PPC, Mips, and Alpha backends need such changes.) git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@136457 91177308-0d34-0410-b5e6-96231b3b80d8
2011-07-29Rewrite the CMake build to use explicit dependencies between libraries,Chandler Carruth
specified in the same file that the library itself is created. This is more idiomatic for CMake builds, and also allows us to correctly specify dependencies that are missed due to bugs in the GenLibDeps perl script, or change from compiler to compiler. On Linux, this returns CMake to a place where it can relably rebuild several targets of LLVM. I have tried not to change the dependencies from the ones in the current auto-generated file. The only places I've really diverged are in places where I was seeing link failures, and added a dependency. The goal of this patch is not to start changing the dependencies, merely to move them into the correct location, and an explicit form that we can control and change when necessary. This also removes a serialization point in the build because we don't have to scan all the libraries before we begin building various tools. We no longer have a step of the build that regenerates a file inside the source tree. A few other associated cleanups fall out of this. This isn't really finished yet though. After talking to dgregor he urged switching to a single CMake macro to construct libraries with both sources and dependencies in the arguments. Migrating from the two macros to that style will be a follow-up patch. Also, llvm-config is still generated with GenLibDeps.pl, which means it still has slightly buggy dependencies. The internal CMake 'llvm-config-like' macro uses the correct explicitly specified dependencies however. A future patch will switch llvm-config generation (when using CMake) to be based on these deps as well. This may well break Windows. I'm getting a machine set up now to dig into any failures there. If anyone can chime in with problems they see or ideas of how to solve them for Windows, much appreciated. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@136433 91177308-0d34-0410-b5e6-96231b3b80d8
2011-07-28Fix a use after free. An instruction can't be both an intrinsic call and a ↵Benjamin Kramer
fence. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@136319 91177308-0d34-0410-b5e6-96231b3b80d8
2011-07-27Merge the contents from exception-handling-rewrite to the mainline.Bill Wendling
This adds the new instructions 'landingpad' and 'resume'. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@136253 91177308-0d34-0410-b5e6-96231b3b80d8
2011-07-27Misc mid-level changes for new 'fence' instruction.Eli Friedman
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@136205 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
2011-07-25Add missing space (this line is no longer pushing the 80-column limit).Nick Lewycky
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@135973 91177308-0d34-0410-b5e6-96231b3b80d8
2011-07-25Add LLVMAddLowerExpectIntrinsicPass to the C API.Rafael Espindola
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@135966 91177308-0d34-0410-b5e6-96231b3b80d8
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