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2012-01-13Cosmetic patch for r148132.Stepan Dyatkovskiy
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@148133 91177308-0d34-0410-b5e6-96231b3b80d8
2012-01-13LoopUnswitch: All helper data that is collected during loop-unswitch ↵Stepan Dyatkovskiy
iterations was moved to separated class (LUAnalysisCache). git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@148132 91177308-0d34-0410-b5e6-96231b3b80d8
2012-01-13Implement proper ObjC ARC objc_retainBlock "escape" analysis, so thatDan Gohman
the optimizer doesn't eliminate objc_retainBlock calls which are needed for their side effect of copying blocks onto the heap. This implements rdar://10361249. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@148076 91177308-0d34-0410-b5e6-96231b3b80d8
2012-01-11Improved compile time:Stepan Dyatkovskiy
1. Size heuristics changed. Now we calculate number of unswitching branches only once per loop. 2. Some checks was moved from UnswitchIfProfitable to processCurrentLoop, since it is not changed during processCurrentLoop iteration. It allows decide to skip some loops at an early stage. Extended statistics: - Added total number of instructions analyzed. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@147935 91177308-0d34-0410-b5e6-96231b3b80d8
2012-01-10Enable LSR IV Chains with sufficient heuristics.Andrew Trick
These heuristics are sufficient for enabling IV chains by default. Performance analysis has been done for i386, x86_64, and thumbv7. The optimization is rarely important, but can significantly speed up certain cases by eliminating spill code within the loop. Unrolled loops are prime candidates for IV chains. In many cases, the final code could still be improved with more target specific optimization following LSR. The goal of this feature is for LSR to make the best choice of induction variables. Instruction selection may not completely take advantage of this feature yet. As a result, there could be cases of slight code size increase. Code size can be worse on x86 because it doesn't support postincrement addressing. In fact, when chains are formed, you may see redundant address plus stride addition in the addressing mode. GenerateIVChains tries to compensate for the common cases. On ARM, code size increase can be mitigated by using postincrement addressing, but downstream codegen currently misses some opportunities. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@147826 91177308-0d34-0410-b5e6-96231b3b80d8
2012-01-09Adding IV chain generation to LSR.Andrew Trick
After collecting chains, check if any should be materialized. If so, hide the chained IV users from the LSR solver. LSR will only solve for the head of the chain. GenerateIVChains will then materialize the chained IV users by computing the IV relative to its previous value in the chain. In theory, chained IV users could be exposed to LSR's solver. This would be considerably complicated to implement and I'm not aware of a case where we need it. In practice it's more important to intelligently prune the search space of nontrivial loops before running the solver, otherwise the solver is often forced to prune the most optimal solutions. Hiding the chained users does this well, so that LSR is more likely to find the best IV for the chain as a whole. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@147801 91177308-0d34-0410-b5e6-96231b3b80d8
2012-01-09Adding collection of IV chains to LSR.Andrew Trick
This collects a set of IV uses within the loop whose values can be computed relative to each other in a sequence. Following checkins will make use of this information. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@147797 91177308-0d34-0410-b5e6-96231b3b80d8
2012-01-09"Minor LSR debugging stuff"Andrew Trick
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@147785 91177308-0d34-0410-b5e6-96231b3b80d8
2012-01-07Enable redundant phi elimination after LSR.Andrew Trick
This will be more important as we extend the LSR pass in ways that don't rely on the formula solver. In particular, we need it for constructing IV chains. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@147724 91177308-0d34-0410-b5e6-96231b3b80d8
2012-01-07LSR: Don't optimize loops if an outer loop has no preheader.Andrew Trick
LoopSimplify may not run on some outer loops, e.g. because of indirect branches. SCEVExpander simply cannot handle outer loops with no preheaders. Fixes rdar://10655343 SCEVExpander segfault. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@147718 91177308-0d34-0410-b5e6-96231b3b80d8
2012-01-07LSR: run DeleteDeadPhis before replaceCongruentPhis.Andrew Trick
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@147711 91177308-0d34-0410-b5e6-96231b3b80d8
2012-01-07Extended replaceCongruentPhis to handle mixed phi types.Andrew Trick
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@147707 91177308-0d34-0410-b5e6-96231b3b80d8
2011-12-27Turn cos(-x) into cos(x). Patch by Alexander Malyshev!Nick Lewycky
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@147291 91177308-0d34-0410-b5e6-96231b3b80d8
2011-12-26Fix warning.Rafael Espindola
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@147284 91177308-0d34-0410-b5e6-96231b3b80d8
2011-12-23Fix typo "infinte".Nick Lewycky
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@147226 91177308-0d34-0410-b5e6-96231b3b80d8
2011-12-22Add the actual code for r147175.Chad Rosier
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@147176 91177308-0d34-0410-b5e6-96231b3b80d8
2011-12-22Speculatively revert r146578 to determine if it is the cause of a number ofChad Rosier
performance regressions (both execution-time and compile-time) on our nightly testers. Original commit message: Fix for bug #11429: Wrong behaviour for switches. Small improvement for code size heuristics. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@147131 91177308-0d34-0410-b5e6-96231b3b80d8
2011-12-21Fix a copy+pasto. No testcase, because the symptoms of dereferencingDan Gohman
an invalid iterator aren't reproducible. rdar://10614085. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@147098 91177308-0d34-0410-b5e6-96231b3b80d8
2011-12-14Move Instruction::isSafeToSpeculativelyExecute out of VMCore andDan Gohman
into Analysis as a standalone function, since there's no need for it to be in VMCore. Also, update it to use isKnownNonZero and other goodies available in Analysis, making it more precise, enabling more aggressive optimization. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@146610 91177308-0d34-0410-b5e6-96231b3b80d8
2011-12-14Fix for bug #11429: Wrong behaviour for switches. Small improvement for code ↵Stepan Dyatkovskiy
size heuristics. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@146578 91177308-0d34-0410-b5e6-96231b3b80d8
2011-12-14It turns out that clang does use pointer-to-function types toDan Gohman
point to ARC-managed pointers sometimes. This fixes rdar://10551239. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@146577 91177308-0d34-0410-b5e6-96231b3b80d8
2011-12-13Cleanup. Clarify LSRInstance public methods.Andrew Trick
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@146459 91177308-0d34-0410-b5e6-96231b3b80d8
2011-12-12Indvars: guard against exponential behavior in isHighCostExpansion.Andrew Trick
This should always be done as a matter of principal. I don't have a case that exposes the problem. I just noticed this recently while scanning the code and realized I meant to fix it long ago. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@146438 91177308-0d34-0410-b5e6-96231b3b80d8
2011-12-12Only replace fwrite with fputc, if the return value is unused.Joerg Sonnenberger
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@146411 91177308-0d34-0410-b5e6-96231b3b80d8
2011-12-12LLVMBuild: Remove trailing newline, which irked me.Daniel Dunbar
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@146409 91177308-0d34-0410-b5e6-96231b3b80d8
2011-12-12When computing reverse-CFG reverse-post-order, skip backedges, asDan Gohman
detected in the forward-CFG DFS. This prevents the reverse-CFG from visiting blocks inside loops after blocks that dominate them in the case where loops have multiple exits. No testcase, because this fixes a bug which in practice only shows up in a full optimizer run, due to the use-list order. This fixes rdar://10422791 and others. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@146408 91177308-0d34-0410-b5e6-96231b3b80d8
2011-12-12Add a TODO comment.Dan Gohman
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@146389 91177308-0d34-0410-b5e6-96231b3b80d8
2011-12-12Fix a copy+pasto in a comment.Dan Gohman
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@146385 91177308-0d34-0410-b5e6-96231b3b80d8
2011-12-12Use getArgOperand instead of getOperand on a call.Dan Gohman
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@146384 91177308-0d34-0410-b5e6-96231b3b80d8
2011-12-12Inline SetSeqToRelease into its only caller, since it's more clear that way.Dan Gohman
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@146383 91177308-0d34-0410-b5e6-96231b3b80d8
2011-12-12Fix omitted break statements in a switch.Dan Gohman
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@146380 91177308-0d34-0410-b5e6-96231b3b80d8
2011-12-12Switch llvm.cttz and llvm.ctlz to accept a second i1 parameter whichChandler Carruth
indicates whether the intrinsic has a defined result for a first argument equal to zero. This will eventually allow these intrinsics to accurately model the semantics of GCC's __builtin_ctz and __builtin_clz and the X86 instructions (prior to AVX) which implement them. This patch merely sets the stage by extending the signature of these intrinsics and establishing auto-upgrade logic so that the old spelling still works both in IR and in bitcode. The upgrade logic preserves the existing (inefficient) semantics. This patch should not change any behavior. CodeGen isn't updated because it can use the existing semantics regardless of the flag's value. Note that this will be followed by API updates to Clang and DragonEgg. Reviewed by Nick Lewycky! git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@146357 91177308-0d34-0410-b5e6-96231b3b80d8
2011-12-10LSR: ignore strides in outer loops.Andrew Trick
Since we're not rewriting IVs in other loops, there's not much reason to consider their stride when generating formulae. This should reduce the number of useless formulas considered by LSR. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@146302 91177308-0d34-0410-b5e6-96231b3b80d8
2011-12-09SplitBlockPredecessors uses ArrayRef instead of Data and Size.Jakub Staszak
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@146277 91177308-0d34-0410-b5e6-96231b3b80d8
2011-12-09Add -unroll-runtime for unrolling loops with run-time trip counts.Andrew Trick
Patch by Brendon Cahoon! This extends the existing LoopUnroll and LoopUnrollPass. Brendon measured no regressions in the llvm test suite with -unroll-runtime enabled. This implementation works by using the existing loop unrolling code to unroll the loop by a power-of-two (default 8). It generates an if-then-else sequence of code prior to the loop to execute the extra iterations before entering the unrolled loop. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@146245 91177308-0d34-0410-b5e6-96231b3b80d8
2011-12-08Fix infinite loop in DSE when deleting a free in a reachable loop that's alsoNick Lewycky
trivially infinite. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@146197 91177308-0d34-0410-b5e6-96231b3b80d8
2011-12-06Push StringRefs through the metadata interface.Benjamin Kramer
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@145934 91177308-0d34-0410-b5e6-96231b3b80d8
2011-12-06LSR: prune undesirable formulae early.Andrew Trick
It's always good to prune early, but formulae that are unsatisfactory in their own right need to be removed before running any other pruning heuristics. We easily avoid generating such formulae, but we need them as an intermediate basis for forming other good formulae. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@145906 91177308-0d34-0410-b5e6-96231b3b80d8
2011-12-05Update comment.Chad Rosier
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@145866 91177308-0d34-0410-b5e6-96231b3b80d8
2011-12-05Make the MemCpyOptimizer a bit more aggressive. I can't think of a scenerioChad Rosier
where this would be bad as the backend shouldn't have a problem inlining small memcpys. rdar://10510150 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@145865 91177308-0d34-0410-b5e6-96231b3b80d8
2011-12-05Add support for vectors of pointers.Nadav Rotem
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@145801 91177308-0d34-0410-b5e6-96231b3b80d8
2011-12-03Fixed deadstoreelimination bug where negative indices were incorrectly ↵Pete Cooper
causing the optimisation to occur Turns out long long + unsigned long long is unsigned. Doh! Fixes http://llvm.org/bugs/show_bug.cgi?id=11455 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@145731 91177308-0d34-0410-b5e6-96231b3b80d8
2011-12-02Fix a few more places where TargetData/TargetLibraryInfo is not being passed.Chad Rosier
Add FIXMEs to places that are non-trivial to fix. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@145661 91177308-0d34-0410-b5e6-96231b3b80d8
2011-12-01Last bit of TargetLibraryInfo propagation. Also fixed a case for TargetDataChad Rosier
where it appeared beneficial to pass. More of rdar://10500969 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@145630 91177308-0d34-0410-b5e6-96231b3b80d8
2011-12-01Propagate TargetLibraryInfo throughout ConstantFolding.cpp and Chad Rosier
InstructionSimplify.cpp. Other fixups as needed. Part of rdar://10500969 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@145559 91177308-0d34-0410-b5e6-96231b3b80d8
2011-11-30Make GlobalMerge honor the preferred alignment on globals without an ↵Eli Friedman
explicitly specified alignment. <rdar://problem/10497732>. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@145523 91177308-0d34-0410-b5e6-96231b3b80d8
2011-11-29Potential bug in RewriteLoopBodyWithConditionConstant: use iterator should ↵Stepan Dyatkovskiy
not be changed inside the uses enumeration loop. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@145432 91177308-0d34-0410-b5e6-96231b3b80d8
2011-11-29build/CMake: Finish removal of add_llvm_library_dependencies.Daniel Dunbar
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@145420 91177308-0d34-0410-b5e6-96231b3b80d8
2011-11-29SCEV fix. In general, Add/Mul expressions should not inherit NSW/NUW.Andrew Trick
This reverts r139450, fixes r139453, and adds much needed comments and a unit test. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@145367 91177308-0d34-0410-b5e6-96231b3b80d8
2011-11-28Remove the temporary flag -disable-unroll-scev and dead code.Andrew Trick
SCEV should now be used for trip count analysis, not LoopInfo. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@145262 91177308-0d34-0410-b5e6-96231b3b80d8
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