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2011-03-20Don't segfault on mutual recursion, as pointed out by Frits.Anders Carlsson
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@127975 91177308-0d34-0410-b5e6-96231b3b80d8
2011-03-20Address comments from Frits van Bommel.Anders Carlsson
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@127974 91177308-0d34-0410-b5e6-96231b3b80d8
2011-03-20Add an optimization to GlobalOpt that eliminates calls to __cxa_atexit, if ↵Anders Carlsson
the function passed is empty. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@127970 91177308-0d34-0410-b5e6-96231b3b80d8
2011-03-19Revert r127953, "SimplifyCFG has stopped duplicating returns into predecessorsDaniel Dunbar
to canonicalize IR", it broke a lot of things. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@127954 91177308-0d34-0410-b5e6-96231b3b80d8
2011-03-19SimplifyCFG has stopped duplicating returns into predecessors to canonicalize IREvan Cheng
to have single return block (at least getting there) for optimizations. This is general goodness but it would prevent some tailcall optimizations. One specific case is code like this: int f1(void); int f2(void); int f3(void); int f4(void); int f5(void); int f6(void); int foo(int x) { switch(x) { case 1: return f1(); case 2: return f2(); case 3: return f3(); case 4: return f4(); case 5: return f5(); case 6: return f6(); } } => LBB0_2: ## %sw.bb callq _f1 popq %rbp ret LBB0_3: ## %sw.bb1 callq _f2 popq %rbp ret LBB0_4: ## %sw.bb3 callq _f3 popq %rbp ret This patch teaches codegenprep to duplicate returns when the return value is a phi and where the phi operands are produced by tail calls followed by an unconditional branch: sw.bb7: ; preds = %entry %call8 = tail call i32 @f5() nounwind br label %return sw.bb9: ; preds = %entry %call10 = tail call i32 @f6() nounwind br label %return return: %retval.0 = phi i32 [ %call10, %sw.bb9 ], [ %call8, %sw.bb7 ], ... [ 0, %entry ] ret i32 %retval.0 This allows codegen to generate better code like this: LBB0_2: ## %sw.bb jmp _f1 ## TAILCALL LBB0_3: ## %sw.bb1 jmp _f2 ## TAILCALL LBB0_4: ## %sw.bb3 jmp _f3 ## TAILCALL rdar://9147433 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@127953 91177308-0d34-0410-b5e6-96231b3b80d8
2011-03-18If an AllocaInst referred by DbgDeclareInst is used by a LoadInst then the ↵Devang Patel
LoadInst should also get a corresponding llvm.dbg.value intrinsic. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@127924 91177308-0d34-0410-b5e6-96231b3b80d8
2011-03-18Remove dead code.Devang Patel
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@127923 91177308-0d34-0410-b5e6-96231b3b80d8
2011-03-18Consider debug info intrinsics pointing to null value as dead instructions.Devang Patel
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@127922 91177308-0d34-0410-b5e6-96231b3b80d8
2011-03-18Remove TargetData and ValueTracking includes. I didn't mean for them to ↵Andrew Trick
sneak in my last checkin. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@127842 91177308-0d34-0410-b5e6-96231b3b80d8
2011-03-17Added isValidRewrite() to check the result of ScalarEvolutionExpander.Andrew Trick
SCEV may generate expressions composed of multiple pointers, which can lead to invalid GEP expansion. Until we can teach SCEV to follow strict pointer rules, make sure no bad GEPs creep into IR. Fixes rdar://problem/9038671. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@127839 91177308-0d34-0410-b5e6-96231b3b80d8
2011-03-17whitespaceAndrew Trick
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@127837 91177308-0d34-0410-b5e6-96231b3b80d8
2011-03-17Try to not lose variable's debug info during instcombine.Devang Patel
This is done by lowering dbg.declare intrinsic into dbg.value intrinsic. Radar 9143931. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@127834 91177308-0d34-0410-b5e6-96231b3b80d8
2011-03-17Refactor into a separate utility function.Devang Patel
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@127832 91177308-0d34-0410-b5e6-96231b3b80d8
2011-03-16Fix a comment.Cameron Zwarich
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@127728 91177308-0d34-0410-b5e6-96231b3b80d8
2011-03-16Only convert allocas to scalars if it is profitable. The profitability metric ICameron Zwarich
chose is having a non-memcpy/memset use and being larger than any native integer type. Originally I chose having an access of a size smaller than the total size of the alloca, but this caused some minor issues on the spirit benchmark where SRoA runs again after some inlining. This fixes <rdar://problem/8613163>. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@127718 91177308-0d34-0410-b5e6-96231b3b80d8
2011-03-16Better use initializer lists.Cameron Zwarich
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@127716 91177308-0d34-0410-b5e6-96231b3b80d8
2011-03-16Add a clarifying comment.Cameron Zwarich
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@127715 91177308-0d34-0410-b5e6-96231b3b80d8
2011-03-15Clean up something noticed by Fritz.Cameron Zwarich
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@127684 91177308-0d34-0410-b5e6-96231b3b80d8
2011-03-15Do not add PHIs with no users when creating LCSSA form. Patch by Andrew Clinton.Cameron Zwarich
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@127674 91177308-0d34-0410-b5e6-96231b3b80d8
2011-03-15PR9450: Make switch optimization in SimplifyCFG not dependent on the orderingEli Friedman
of pointers in an std::map. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@127650 91177308-0d34-0410-b5e6-96231b3b80d8
2011-03-15If we don't know how long a string is we can't fold an _chk version to theEric Christopher
normal version. Fixes rdar://9123638 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@127636 91177308-0d34-0410-b5e6-96231b3b80d8
2011-03-14Added SCEV::NoWrapFlags to manage unsigned, signed, and self wrapAndrew Trick
properties. Added the self-wrap flag for SCEV::AddRecExpr. A slew of temporary FIXMEs indicate the intention of the no-self-wrap flag without changing behavior in this revision. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@127590 91177308-0d34-0410-b5e6-96231b3b80d8
2011-03-14whitespaceAndrew Trick
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@127589 91177308-0d34-0410-b5e6-96231b3b80d8
2011-03-14This case is solved by Scalar Replacement of Aggregates (DT) andJin-Gu Kang
Early CSE pass so this patch reverts it to original source code. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@127574 91177308-0d34-0410-b5e6-96231b3b80d8
2011-03-13Add comment as following:Jin-Gu Kang
load and store reference same memory location, the memory location is represented by getelementptr with two uses (load and store) and the getelementptr's base is alloca with single use. At this point, instructions from alloca to store can be removed. (this pattern is generated when bitfield is accessed.) For example, %u = alloca %struct.test, align 4 ; [#uses=1] %0 = getelementptr inbounds %struct.test* %u, i32 0, i32 0;[#uses=2] %1 = load i8* %0, align 4 ; [#uses=1] %2 = and i8 %1, -16 ; [#uses=1] %3 = or i8 %2, 5 ; [#uses=1] store i8 %3, i8* %0, align 4 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@127565 91177308-0d34-0410-b5e6-96231b3b80d8
2011-03-12This patch removes some of useless instructions generated by bitfield access.Jin-Gu Kang
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@127539 91177308-0d34-0410-b5e6-96231b3b80d8
2011-03-11Roll r127459 back in:Cameron Zwarich
Optimize trivial branches in CodeGenPrepare, which often get created from the lowering of objectsize intrinsics. Unfortunately, a number of tests were relying on llc not optimizing trivial branches, so I had to add an option to allow them to continue to test what they originally tested. This fixes <rdar://problem/8785296> and <rdar://problem/9112893>. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@127498 91177308-0d34-0410-b5e6-96231b3b80d8
2011-03-11Revert r127459, "Optimize trivial branches in CodeGenPrepare, which often getDaniel Dunbar
created from the", it broke some GCC test suite tests. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@127477 91177308-0d34-0410-b5e6-96231b3b80d8
2011-03-11InstCombine: Fix a thinko where transform an icmp under the assumption that ↵Benjamin Kramer
it's a zero comparison when it's not. Fixes PR9454. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@127464 91177308-0d34-0410-b5e6-96231b3b80d8
2011-03-11Optimize trivial branches in CodeGenPrepare, which often get created from theCameron Zwarich
lowering of objectsize intrinsics. Unfortunately, a number of tests were relying on llc not optimizing trivial branches, so I had to add an option to allow them to continue to test what they originally tested. This fixes <rdar://problem/8785296> and <rdar://problem/9112893>. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@127459 91177308-0d34-0410-b5e6-96231b3b80d8
2011-03-10RecursivelyDeleteTriviallyDeadInstructions only needs aDan Gohman
Value, not an Instruction, so casting is not necessary. Also, it's theoretically possible that the Value is not an Instruction, since WeakVH follows RAUWs. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@127427 91177308-0d34-0410-b5e6-96231b3b80d8
2011-03-10Fix reassociate to postpone certain instruction deletions untilDan Gohman
after it has finished all of its reassociations, because its habit of unlinking operands and holding them in a datastructure while working means that it's not easy to determine when an instruction is really dead until after all its regular work is done. rdar://9096268. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@127424 91177308-0d34-0410-b5e6-96231b3b80d8
2011-03-10InstCombine: Turn umul_with_overflow into mul nuw if we can prove that it ↵Benjamin Kramer
cannot overflow. This happens a lot in clang-compiled C++ code because it adds overflow checks to operator new[]: unsigned *foo(unsigned n) { return new unsigned[n]; } We can optimize away the overflow check on 64 bit targets because (uint64_t)n*4 cannot overflow. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@127418 91177308-0d34-0410-b5e6-96231b3b80d8
2011-03-09Preserve line number information while simplifying libcalls.Devang Patel
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@127362 91177308-0d34-0410-b5e6-96231b3b80d8
2011-03-09These llvm.dbg.* constants are not used anymore.Devang Patel
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@127352 91177308-0d34-0410-b5e6-96231b3b80d8
2011-03-09Fix a crasher introduced by r127317 that is seen on the bots when using anCameron Zwarich
alloca as both integer and floating-point vectors of the same size. Bugpoint is not cooperating with me, but I'll try to find a manual testcase tomorrow. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@127320 91177308-0d34-0410-b5e6-96231b3b80d8
2011-03-09Add support to scalar replacement for partial vector accesses of an alloca, e.g.Cameron Zwarich
a union of a float, <2 x float>, and <4 x float>. This mostly comes up with the use of vector intrinsics, especially in NEON when programmers know the layout of the register file. This enables codegen to eliminate a lot of the subregister traffic it would otherwise generate. This commit only enables this for a small number of floating-point cases, but a lot more integer cases. I assume this is okay for all ports, but I did not do extensive testing of the quality of code involving i512 vectors and the like. If there is a use case where this generates worse code than before, let me know and we can scale it back. This fixes <rdar://problem/9036264>. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@127317 91177308-0d34-0410-b5e6-96231b3b80d8
2011-03-09Move vector type merging to a separate function in preparation for it gettingCameron Zwarich
more complicated. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@127316 91177308-0d34-0410-b5e6-96231b3b80d8
2011-03-09PR9346: Prevent SimplifyDemandedBits from incorrectly introducingEli Friedman
INT_MIN % -1. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@127306 91177308-0d34-0410-b5e6-96231b3b80d8
2011-03-09PR9420; an instruction before an unreachable is guaranteed not to have anyEli Friedman
reachable uses, but there still might be uses in dead blocks. Use the standard solution of replacing all the uses with undef. This is a rare case because it's very sensitive to phase ordering in SimplifyCFG. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@127299 91177308-0d34-0410-b5e6-96231b3b80d8
2011-03-08llvm.dbg.declare intrinsic does not use any llvm::Values. It's magic!Devang Patel
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@127282 91177308-0d34-0410-b5e6-96231b3b80d8
2011-03-08Reorder comments to put them the right way around.Nick Lewycky
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@127220 91177308-0d34-0410-b5e6-96231b3b80d8
2011-03-08While sinking an instruction, do not lose llvm.dbg.value intrinsic.Devang Patel
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@127214 91177308-0d34-0410-b5e6-96231b3b80d8
2011-03-07Preserve line no. info.Devang Patel
Radar 9097659 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@127182 91177308-0d34-0410-b5e6-96231b3b80d8
2011-03-07Add more analysis of the sign bit of an srem instruction. If the LHS is negativeNick Lewycky
then the result could go either way. If it's provably positive then so is the srem. Fixes PR9343 #7! git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@127146 91177308-0d34-0410-b5e6-96231b3b80d8
2011-03-06Don't internalize available_externally functions. We already did the rightRafael Espindola
thing for variables. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@127138 91177308-0d34-0410-b5e6-96231b3b80d8
2011-03-06ConstantInt has some getters which return ConstantInt's or ConstantVector's ofNick Lewycky
the value splatted into every element. Extend this to getTrue and getFalse which by providing new overloads that take Types that are either i1 or <N x i1>. Use it in InstCombine to add vector support to some code, fixing PR8469! git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@127116 91177308-0d34-0410-b5e6-96231b3b80d8
2011-03-05InstCombine: We know the number of items initially added to the worklist ↵Benjamin Kramer
map, reserve space early to avoid rehashing. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@127089 91177308-0d34-0410-b5e6-96231b3b80d8
2011-03-05Fix PR9398 - 10% of llc compile time is spent in Value::getNumUses. This reducesCameron Zwarich
the percentage of time spent in CodeGenPrepare when llcing 403.gcc from 12.6% to 1.8% of total llc time. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@127069 91177308-0d34-0410-b5e6-96231b3b80d8
2011-03-05Thread comparisons over udiv/sdiv/ashr/lshr exact and lshr nuw/nsw wheneverNick Lewycky
possible. This goes into instcombine and instsimplify because instsimplify doesn't need to check hasOneUse since it returns (almost exclusively) constants. This fixes PR9343 #4 #5 and #8! git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@127064 91177308-0d34-0410-b5e6-96231b3b80d8
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