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path: root/lib/Transforms/Scalar/IndVarSimplify.cpp
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2011-07-18Compiler warning.Andrew Trick
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@135426 91177308-0d34-0410-b5e6-96231b3b80d8
2011-07-18indvars: LinearFunctionTestReplace for non-canonical IVs.Andrew Trick
For -disable-iv-rewrite, perform LFTR without generating a new "canonical" induction variable. Instead find the "best" existing induction variable for use in the loop exit test and compute the final value of that IV for use in the new loop exit test. In short, convert to a simple eq/ne exit test as long as it's cheap to do so. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@135420 91177308-0d34-0410-b5e6-96231b3b80d8
2011-07-18indvars: Added verification that LFTR and other indvars goodness doesAndrew Trick
not interfere with BackedgeTakenCount computation. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@135412 91177308-0d34-0410-b5e6-96231b3b80d8
2011-07-18indvars: Added isHighCostExpansion. Avoid generating extra ops in theAndrew Trick
preheader for the sole purpose of LFTR, since LFTR itself is usually not a clear optimization. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@135409 91177308-0d34-0410-b5e6-96231b3b80d8
2011-07-18land David Blaikie's patch to de-constify Type, with a few tweaks.Chris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@135375 91177308-0d34-0410-b5e6-96231b3b80d8
2011-07-16indvars: fix a pass-sensitivity issue that would hit the SCEVExpanderAndrew Trick
assertion I added in r135333. Check for the existence of a preheader before expanding a recurrence. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@135335 91177308-0d34-0410-b5e6-96231b3b80d8
2011-07-16indvars: remove ExprToIVMap because it won't be needed by LFTR.Andrew Trick
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@135334 91177308-0d34-0410-b5e6-96231b3b80d8
2011-07-12indvars: Code reorganization in preparation forAndrew Trick
LinearFunctionTestReplace rewrite. No functionality. I've been wanting to group the indvar subphases into sections and order them by their logical sequence. My next checkin adds functions related to LFTR, and doing the reorg now should help reviewers. Since, most of the code in IndVarSimplify.cpp has recently been replaced or will be replaced soon, obscuring blame should not be an issue. This seems like an ideal time to shuffle the code around. I'm happy to take more suggestions for cleaning up the code. Or if you've been wanting to cleanup anything in this file yourself, now is a good time. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@134941 91177308-0d34-0410-b5e6-96231b3b80d8
2011-07-06indvars -disable-iv-rewrite: ExprToMap lives in Pass data, so be moreAndrew Trick
careful about referencing values. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@134537 91177308-0d34-0410-b5e6-96231b3b80d8
2011-07-06indvars -disable-iv-rewrite: Added SimplifyCongruentIVs.Andrew Trick
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@134530 91177308-0d34-0410-b5e6-96231b3b80d8
2011-07-05Preserve debug loc.Devang Patel
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@134441 91177308-0d34-0410-b5e6-96231b3b80d8
2011-07-05indvars -disable-iv-rewrite: avoid multiple IVs in weird cases.Andrew Trick
Putting back the helper that I removed on 7/1 to do this right. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@134423 91177308-0d34-0410-b5e6-96231b3b80d8
2011-07-02indvars -disable-iv-rewrite: bug fix involving weird geps and related cleanup.Andrew Trick
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@134306 91177308-0d34-0410-b5e6-96231b3b80d8
2011-06-30indvars -disable-iv-rewrite: handle cloning binary operators that cannot ↵Andrew Trick
overflow. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@134177 91177308-0d34-0410-b5e6-96231b3b80d8
2011-06-30indvars -disable-iv-rewrite: handle an edge case involving identity phis.Andrew Trick
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@134124 91177308-0d34-0410-b5e6-96231b3b80d8
2011-06-29indvars -disable-iv-rewrite: insert new trunc instructions carefully.Andrew Trick
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@134112 91177308-0d34-0410-b5e6-96231b3b80d8
2011-06-29indvars -disable-iv-rewrite: just because SCEV ignores casts doesn'tAndrew Trick
mean they can be removed. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@134054 91177308-0d34-0410-b5e6-96231b3b80d8
2011-06-28cleanup: misleading comment.Andrew Trick
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@134010 91177308-0d34-0410-b5e6-96231b3b80d8
2011-06-28SCEVExpander: give new insts a name that identifies the reponsible pass.Andrew Trick
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@133992 91177308-0d34-0410-b5e6-96231b3b80d8
2011-06-28indvars --disable-iv-rewrite: sever ties with IVUsers.Andrew Trick
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@133988 91177308-0d34-0410-b5e6-96231b3b80d8
2011-06-28indvars --disable-iv-rewrite: Defer evaluating s/zext until SCEVAndrew Trick
evaluates all other IV exprs. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@133982 91177308-0d34-0410-b5e6-96231b3b80d8
2011-06-27indvars -disable-iv-rewrite: run RLEV after SimplifyIVUsers forAndrew Trick
a bit more control over the order SCEVs are evaluated. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@133959 91177308-0d34-0410-b5e6-96231b3b80d8
2011-06-22Set debug loc.Devang Patel
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@133636 91177308-0d34-0410-b5e6-96231b3b80d8
2011-06-21IVUsers no longer needs to record the phis.Andrew Trick
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@133518 91177308-0d34-0410-b5e6-96231b3b80d8
2011-06-21indvars -disable-iv-rewrite: Adds support for eliminating identityAndrew Trick
ops. This is a rewrite of the IV simplification algorithm used by -disable-iv-rewrite. To avoid perturbing the default mode, I temporarily split the driver and created SimplifyIVUsersNoRewrite. The idea is to avoid doing opcode/pattern matching inside IndVarSimplify. SCEV already does it. We want to optimize with the full generality of SCEV, but optimize def-use chains top down on-demand rather than rewriting the entire expression bottom-up. This was easy to do for operations that SCEV can prove are identity function. So we're now eliminating bitmasks and zero extends this way. A result of this rewrite is that indvars -disable-iv-rewrite no longer requires IVUsers. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@133502 91177308-0d34-0410-b5e6-96231b3b80d8
2011-05-26indvars: incremental fixes for -disable-iv-rewrite and testcases.Andrew Trick
Use a proper worklist for use-def traversal without holding onto an iterator. Now that we process all IV uses, we need complete logic for resusing existing derived IV defs. See HoistStep. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@132103 91177308-0d34-0410-b5e6-96231b3b80d8
2011-05-25indvars: fixed IV cloning in -disable-iv-rewrite mode with associatedAndrew Trick
cleanup and overdue test cases. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@132038 91177308-0d34-0410-b5e6-96231b3b80d8
2011-05-20indvars: Prototyping Sign/ZeroExtend elimination without canonical IVs.Andrew Trick
No functionality enabled by default. Use -disable-iv-rewrite. Extended IVUsers to keep track of the phi that represents the users' IV. Added the WidenIV transform to replace a narrow IV with a wide IV by doing a one-for-one replacement of IV users instead of expanding the SCEV expressions. [sz]exts are removed and truncs are inserted. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@131744 91177308-0d34-0410-b5e6-96231b3b80d8
2011-05-20indvars: minor cleanup in preparation for sign/zero extend elimination.Andrew Trick
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@131716 91177308-0d34-0410-b5e6-96231b3b80d8
2011-05-13Convert SimplifyIVUsers into a worklist instead of a single pass overAndrew Trick
the users. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@131277 91177308-0d34-0410-b5e6-96231b3b80d8
2011-05-12indvars: Added SimplifyIVUsers.Andrew Trick
Interleave IV simplifications. Currently involves EliminateComparison and EliminateRemainder. Next I'll add EliminateExtend. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@131210 91177308-0d34-0410-b5e6-96231b3b80d8
2011-05-04indvars: Added DisableIVRewrite and WidenIVs.Andrew Trick
This adds functionality to remove size/zero extension during indvars without generating a canonical IV and rewriting all IV users. It's disabled by default so should have no effect on codegen. Work in progress. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@130829 91177308-0d34-0410-b5e6-96231b3b80d8
2011-05-03indvars: Added canExpandBackEdgeTakenCount.Andrew Trick
Only create a canonical IV for backedge taken count if it will actually be used by LinearFunctionTestReplace. And some related cleanup, preparing to reduce dependence on canonical IVs. No significant effect on x86 or arm in the test-suite. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@130799 91177308-0d34-0410-b5e6-96231b3b80d8
2011-04-28Reapply r130340: Fix for PR9730.Andrew Trick
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@130408 91177308-0d34-0410-b5e6-96231b3b80d8
2011-04-28Reverting r130340 in the unlikely event that it's responsible for a llvm-gcc ↵Andrew Trick
stage2 compiler error. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@130350 91177308-0d34-0410-b5e6-96231b3b80d8
2011-04-27Fixes PR9730: indvars: An asserting value handle still pointed to this valueAndrew Trick
Modified LinearFunctionTestReplace to push the condition on the dead list instead of eagerly deleting it. This can cause unnecessary IV rewrites, which should have no effect on codegen and will not be an issue once we stop generating canonical IVs. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@130340 91177308-0d34-0410-b5e6-96231b3b80d8
2011-03-30Remove PHINode::reserveOperandSpace(). Instead, add a parameter toJay Foad
PHINode::Create() giving the (known or expected) number of operands. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@128537 91177308-0d34-0410-b5e6-96231b3b80d8
2011-03-30(Almost) always call reserveOperandSpace() on newly created PHINodes.Jay Foad
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@128535 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
2011-01-09reduce indentation. Print <nuw> and <nsw> when dumping SCEV AddRec'sChris Lattner
that have the bit set. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@123104 91177308-0d34-0410-b5e6-96231b3b80d8
2010-11-17Move SCEV::isLoopInvariant and hasComputableLoopEvolution to be memberDan Gohman
functions of ScalarEvolution, in preparation for memoization and other optimizations. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@119562 91177308-0d34-0410-b5e6-96231b3b80d8
2010-10-19Get rid of static constructors for pass registration. Instead, every pass ↵Owen Anderson
exposes an initializeMyPassFunction(), which must be called in the pass's constructor. This function uses static dependency declarations to recursively initialize the pass's dependencies. Clients that only create passes through the createFooPass() APIs will require no changes. Clients that want to use the CommandLine options for passes will need to manually call the appropriate initialization functions in PassInitialization.h before parsing commandline arguments. I have tested this with all standard configurations of clang and llvm-gcc on Darwin. It is possible that there are problems with the static dependencies that will only be visible with non-standard options. If you encounter any crash in pass registration/creation, please send the testcase to me directly. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@116820 91177308-0d34-0410-b5e6-96231b3b80d8
2010-10-12Begin adding static dependence information to passes, which will allow us toOwen Anderson
perform initialization without static constructors AND without explicit initialization by the client. For the moment, passes are required to initialize both their (potential) dependencies and any passes they preserve. I hope to be able to relax the latter requirement in the future. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@116334 91177308-0d34-0410-b5e6-96231b3b80d8
2010-10-07Now with fewer extraneous semicolons!Owen Anderson
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@115996 91177308-0d34-0410-b5e6-96231b3b80d8
2010-09-18do not rely on the implicit-dereference semantics of dyn_cast_or_nullGabor Greif
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@114277 91177308-0d34-0410-b5e6-96231b3b80d8
2010-08-06Reapply r110396, with fixes to appease the Linux buildbot gods.Owen Anderson
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@110460 91177308-0d34-0410-b5e6-96231b3b80d8
2010-08-06Revert r110396 to fix buildbots.Owen Anderson
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@110410 91177308-0d34-0410-b5e6-96231b3b80d8
2010-08-05Don't use PassInfo* as a type identifier for passes. Instead, use the ↵Owen Anderson
address of the static ID member as the sole unique type identifier. Clean up APIs related to this change. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@110396 91177308-0d34-0410-b5e6-96231b3b80d8
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