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2011-07-20indvars: Added getInsertPointForUses to find a valid place to truncate the IV.Andrew Trick
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@135568 91177308-0d34-0410-b5e6-96231b3b80d8
2011-07-20indvars test case for r135558.Andrew Trick
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@135559 91177308-0d34-0410-b5e6-96231b3b80d8
2011-07-20indvars -disable-iv-rewrite fix: derived GEP IVsAndrew Trick
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@135558 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
2011-07-06indvars -disable-iv-rewrite: Added SimplifyCongruentIVs.Andrew Trick
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@134530 91177308-0d34-0410-b5e6-96231b3b80d8
2011-07-02indvars -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
2011-06-28FileCheckify and prepare for -disable-iv-rewrite.Andrew Trick
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@133998 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
2011-06-17manually upgrade a bunch of tests to modern syntax, and remove some thatChris Lattner
are either unreduced or only test old syntax. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@133228 91177308-0d34-0410-b5e6-96231b3b80d8
2011-06-02Test case pasto (failed when run with IR verifier).Andrew Trick
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@132516 91177308-0d34-0410-b5e6-96231b3b80d8
2011-05-31scev: Better sign-extend removal. Normalize postincrement recurrencesAndrew Trick
so that their sign extended forms are congruent when no overflow occurs. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@132360 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
2011-05-24FileCheck-ize a couple of IV unit tests.Andrew Trick
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@131946 91177308-0d34-0410-b5e6-96231b3b80d8
2011-05-24Test case for r130799 - indvars: Added canExpandBackEdgeTakenCount.Andrew Trick
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@131939 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
2011-03-18Avoid creating canonical induction variables for non-native types.Andrew Trick
For example, on 32-bit architecture, don't promote all uses of the IV to 64-bits just because one use is a 64-bit cast. Alternate implementation of the patch by Arnaud de Grandmaison. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@127884 91177308-0d34-0410-b5e6-96231b3b80d8
2010-10-07Remove LoopIndexSplit pass. It is neither maintained nor used by anyone.Devang Patel
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@116004 91177308-0d34-0410-b5e6-96231b3b80d8
2010-09-02more test cleanupChris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@112892 91177308-0d34-0410-b5e6-96231b3b80d8
2010-09-02Print the number of uses of a function in the .ll since it can be informativeDuncan Sands
and there seems to be no reason not to. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@112812 91177308-0d34-0410-b5e6-96231b3b80d8
2010-08-30Correct bogus module triple specifications.Duncan Sands
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@112469 91177308-0d34-0410-b5e6-96231b3b80d8
2010-07-26Fix SCEVExpander::visitAddRecExpr so that it remembers the induction variableDan Gohman
it inserted rather than using LoopInfo::getCanonicalInductionVariable to rediscover it, since that doesn't work on non-canonical loops. This fixes infinite recurrsion on such loops; PR7562. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@109419 91177308-0d34-0410-b5e6-96231b3b80d8
2010-07-16Fix this test.Dan Gohman
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@108491 91177308-0d34-0410-b5e6-96231b3b80d8
2010-07-15Fix the order that SCEVExpander considers add operands in so thatDan Gohman
it doesn't miss an opportunity to form a GEP, regardless of the relative loop depths of the operands. This fixes rdar://8197217. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@108475 91177308-0d34-0410-b5e6-96231b3b80d8
2010-06-29Fix ScalarEvolution's tripcount computation for chains of loopsDan Gohman
where each loop's induction variable's start value is the exit value of a preceding loop. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@107224 91177308-0d34-0410-b5e6-96231b3b80d8
2010-06-18Disable indvars on loops when LoopSimplify form is not available.Dan Gohman
This fixes PR7333. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@106267 91177308-0d34-0410-b5e6-96231b3b80d8
2010-06-17Remove arm_apcscc from the test files. It is the default and doing thisRafael Espindola
matches what llvm-gcc and clang now produce. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@106221 91177308-0d34-0410-b5e6-96231b3b80d8
2010-04-19Remove the Expr member from IVUsers. Instead of remembering the expression,Dan Gohman
just ask ScalarEvolution for it on demand. This helps IVUsers be more robust in the case of expressions changing underneath it. This fixes PR6862. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@101819 91177308-0d34-0410-b5e6-96231b3b80d8
2010-04-17Fix declarations in a few more tests.Nick Lewycky
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@101676 91177308-0d34-0410-b5e6-96231b3b80d8
2010-04-13Teach ScalarEvolution to simplify smax and umax when it can proveDan Gohman
that one operand is always greater than another. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@101142 91177308-0d34-0410-b5e6-96231b3b80d8
2010-04-13Teach IndVarSimplify how to eliminate remainder operators where theDan Gohman
numerator is an induction variable. For example, with code like this: for (i=0;i<n;++i) x[i%n] = 0; IndVarSimplify will now recognize that i is always less than n inside the loop, and eliminate the remainder. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@101113 91177308-0d34-0410-b5e6-96231b3b80d8
2010-04-12Suppress LinearFunctionTestReplace when the computed backedge-takenDan Gohman
expression is a UDiv and it doesn't appear that the UDiv came from the user's source. ScalarEvolution has recently figured out how to compute a tripcount expression for the inner loop in SingleSource/Benchmarks/Shootout/sieve.c, using a udiv. Emitting a udiv instruction dramatically slows down the enclosing loop. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@101068 91177308-0d34-0410-b5e6-96231b3b80d8
2010-04-12Re-apply r101000, with a fix: Don't eliminate an icmp which is part ofDan Gohman
the loop exit test. This usually doesn't come up for a variety of reasons, but it isn't impossible, so make IndVarSimplify handle it conservatively. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@101008 91177308-0d34-0410-b5e6-96231b3b80d8
2010-04-12Revert 101000, which is breaking self-host builds.Dan Gohman
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@101002 91177308-0d34-0410-b5e6-96231b3b80d8
2010-04-11Teach IndVarSimplify how to eliminate comparisons involving inductionDan Gohman
variables. For example, with code like this: for (i=0;i<n;++i) if (i<n) x[i] = 0; IndVarSimplify will now recognize that i is always less than n inside the loop, and eliminate the if. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@101000 91177308-0d34-0410-b5e6-96231b3b80d8
2010-04-07add newlines at the end of files.Chris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@100705 91177308-0d34-0410-b5e6-96231b3b80d8
2010-04-03add integer overflow check for the fp induction variable Chris Lattner
checker. Amusingly, we already had tests that we should have rejects because they would be miscompiled in the testsuite. The remaining issue with this is that we don't check that the branch causes us to exit the loop if it fails, so we don't actually know if we remain in bounds. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@100284 91177308-0d34-0410-b5e6-96231b3b80d8
2010-04-03fix PR6761, a miscompilation due to the fp->int IV conversionChris Lattner
stuff. More bugs remain though. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@100282 91177308-0d34-0410-b5e6-96231b3b80d8
2010-04-03convert to filecheckChris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@100281 91177308-0d34-0410-b5e6-96231b3b80d8
2010-04-03rename feature test.Chris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@100279 91177308-0d34-0410-b5e6-96231b3b80d8
2010-04-03actually just remove this, will move the real feature test here.Chris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@100278 91177308-0d34-0410-b5e6-96231b3b80d8
2010-04-03rename test since it is a feature test.Chris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@100277 91177308-0d34-0410-b5e6-96231b3b80d8
2010-04-03first half of a pass through IndVarSimplify::HandleFloatingPointIV,Chris Lattner
this cleans up a bunch of code and also fixes several crashes and miscompiles. More to come unfortunately, this optimization is quite broken. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@100270 91177308-0d34-0410-b5e6-96231b3b80d8
2010-04-02Manually notify ScalarEvolution before making an operand replacement, sinceDan Gohman
it can't currently observe such changes automatically. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@100186 91177308-0d34-0410-b5e6-96231b3b80d8
2010-02-25Make LoopSimplify change conditional branches in loop exiting blocksDan Gohman
which branch on undef to branch on a boolean constant for the edge exiting the loop. This helps ScalarEvolution compute trip counts for loops. Teach ScalarEvolution to recognize single-value PHIs, when safe, and ForgetSymbolicName to forget such single-value PHI nodes as apprpriate in ForgetSymbolicName. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@97126 91177308-0d34-0410-b5e6-96231b3b80d8
2010-02-19Teach ScalarEvolution how to compute a tripcount for a loop withDan Gohman
true or false as its exit condition. These are usually eliminated by SimplifyCFG, but the may be left around during a pass which wishes to preserve the CFG. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@96683 91177308-0d34-0410-b5e6-96231b3b80d8
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