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* Re-implement the main strength-reduction portion of LoopStrengthReduction.Dan Gohman2010-01-21
| | | | | | | | | | | | | | | This new version is much more aggressive about doing "full" reduction in cases where it reduces register pressure, and also more aggressive about rewriting induction variables to count down (or up) to zero when doing so reduces register pressure. It currently uses fairly simplistic algorithms for finding reuse opportunities, but it introduces a new framework allows it to combine multiple strategies at once to form hybrid solutions, instead of doing all full-reduction or all base+index. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@94061 91177308-0d34-0410-b5e6-96231b3b80d8
* Use WriteAsOperand instead of getName() to print loop header names,Dan Gohman2010-01-09
| | | | | | | so that unnamed blocks are handled. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@93059 91177308-0d34-0410-b5e6-96231b3b80d8
* Move this test from test/Transforms/IndVarSimplify toDan Gohman2010-01-05
| | | | | | | | test/CodeGen/X86, as doesn't use -indvars, and it does use llc -march=x86-64. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@92799 91177308-0d34-0410-b5e6-96231b3b80d8
* Make getUniqueExitBlocks's precondition assert more precise, toDan Gohman2009-12-11
| | | | | | | avoid spurious failures. This fixes PR5758. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@91147 91177308-0d34-0410-b5e6-96231b3b80d8
* Make opt default to not adding a target data string and update tests that ↵Kenneth Uildriks2009-11-03
| | | | | | depend on target data to supply it within the test git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@85900 91177308-0d34-0410-b5e6-96231b3b80d8
* Add a testcase for r83011.Dan Gohman2009-09-28
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@83012 91177308-0d34-0410-b5e6-96231b3b80d8
* Fix a case where ScalarEvolution was expanding pointer arithmeticDan Gohman2009-09-26
| | | | | | | to inttoptr/ptrtoint unnecessarily. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@82864 91177308-0d34-0410-b5e6-96231b3b80d8
* Change tests from "opt %s" to "opt < %s" so that opt doesn't see theDan Gohman2009-09-11
| | | | | | | | | input filename so that opt doesn't print the input filename in the output so that grep lines in the tests don't unintentionally match strings in the input filename. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@81537 91177308-0d34-0410-b5e6-96231b3b80d8
* Use "opt < %s" instead of "opt %s" so that opt doesn't print the testDan Gohman2009-09-08
| | | | | | | filename in the output, which interferes with the tests' grep lines. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@81263 91177308-0d34-0410-b5e6-96231b3b80d8
* Convert a few more opt | llvm-dis to opt -S.Dan Gohman2009-09-08
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@81261 91177308-0d34-0410-b5e6-96231b3b80d8
* Use opt -S instead of piping bitcode output through llvm-dis.Dan Gohman2009-09-08
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@81257 91177308-0d34-0410-b5e6-96231b3b80d8
* Change these tests to feed the assembly files to opt directly, insteadDan Gohman2009-09-08
| | | | | | | of using llvm-as, now that opt supports this. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@81226 91177308-0d34-0410-b5e6-96231b3b80d8
* Eliminate uses of %prcontext.Daniel Dunbar2009-09-05
| | | | | | | - I'd appreciate it if someone else eyeballs my changes to make sure I captured the intent of the test. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@81083 91177308-0d34-0410-b5e6-96231b3b80d8
* Special-case static allocas in IndVarSimplify's loop invariantDan Gohman2009-08-25
| | | | | | | | | sinking code, since they are special. If the loop preheader happens to be the entry block of a function, don't sink static allocas out of it. This fixes PR4775. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@80010 91177308-0d34-0410-b5e6-96231b3b80d8
* Generalize ScalarEvolution to be able to analyze GEPs whenDan Gohman2009-08-18
| | | | | | | | | TargetData is not present. It still uses TargetData when available. This generalization also fixed some limitations in the TargetData case; the attached testcase covers this. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@79344 91177308-0d34-0410-b5e6-96231b3b80d8
* The upper argument of ConstantRange is exclusive, not inclusive.Dan Gohman2009-07-20
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@76492 91177308-0d34-0410-b5e6-96231b3b80d8
* Revert the addition of hasNoPointerOverflow to GEPOperator.Dan Gohman2009-07-20
| | | | | | | | | | | | | Getelementptrs that are defined to wrap are virtually useless to optimization, and getelementptrs that are undefined on any kind of overflow are too restrictive -- it's difficult to ensure that all intermediate addresses are within bounds. I'm going to take a different approach. Remove a few optimizations that depended on this flag. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@76437 91177308-0d34-0410-b5e6-96231b3b80d8
* Fill in some holes in ScalarEvolution's loop iteration conditionDan Gohman2009-07-16
| | | | | | | | analysis. This allows indvars to emit a simpler loop trip count expression. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@76085 91177308-0d34-0410-b5e6-96231b3b80d8
* Switch invars away from using isTrapping when it really shouldn't be Eli Friedman2009-07-15
| | | | | | | | using it. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@75852 91177308-0d34-0410-b5e6-96231b3b80d8
* Fix the expansion of umax and smax in the case where one or more ofDan Gohman2009-07-14
| | | | | | | | | the operands have pointer type, so that the resulting type matches the original SCEV type, and so that unnecessary ptrtoints are avoided in common cases. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@75680 91177308-0d34-0410-b5e6-96231b3b80d8
* Add a testcase for a bug fixed by r75634.Dan Gohman2009-07-14
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@75644 91177308-0d34-0410-b5e6-96231b3b80d8
* Update LoopSimplify and LoopUnswitch to use the new makeLoopInvariantDan Gohman2009-07-14
| | | | | | | function. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@75584 91177308-0d34-0410-b5e6-96231b3b80d8
* Fix indvars to not assume that a loop with a single unique exitDan Gohman2009-07-14
| | | | | | | block has a single unique exiting block. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@75579 91177308-0d34-0410-b5e6-96231b3b80d8
* Reapply 75252, with a fix to avoid the infinite recursion case. TheDan Gohman2009-07-13
| | | | | | | | check for avoiding re-analyzing a widening cast needed to happen earlier, as getSCEV itself may result in a isLoopGuardedByCond query. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@75511 91177308-0d34-0410-b5e6-96231b3b80d8
* Revert r75252 which was causing some crashes at compile time.Nick Lewycky2009-07-11
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@75384 91177308-0d34-0410-b5e6-96231b3b80d8
* Generalize ScalarEvolution's cast-folding code to support more kindsDan Gohman2009-07-10
| | | | | | | | of loops. Add several new functions to for working with ScalarEvolution's add-hoc value-range analysis functionality. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@75252 91177308-0d34-0410-b5e6-96231b3b80d8
* Don't cache PHI exit values from exhaustive evaluations, becauseDan Gohman2009-06-29
| | | | | | | | | an individual exhaustive evaluation reflects only the exit value implied by an individual exit, which may differ from the actual exit value of the loop if there are other exits. This fixes PR4477. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@74447 91177308-0d34-0410-b5e6-96231b3b80d8
* When a value is used multiple times within a single PHI, instructionsDan Gohman2009-06-27
| | | | | | | | | inserted to replace that value must dominate all of of the basic blocks associated with the uses of the value in the PHI, not just one of them. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@74376 91177308-0d34-0410-b5e6-96231b3b80d8
* Add some testcases for some of the recent ScalarEvolution bug fixes.Dan Gohman2009-06-26
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@74353 91177308-0d34-0410-b5e6-96231b3b80d8
* Simplify [su]max(MAX, n) to MAX. This comes up in loop tripcountDan Gohman2009-06-24
| | | | | | | | | | computations in loops with multiple exits. Adjust the testcase for PR4436 so that the relevant portion isn't optimized away. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@74073 91177308-0d34-0410-b5e6-96231b3b80d8
* When inserting code into a loop preheader, insert it before theDan Gohman2009-06-24
| | | | | | | | | terminator, instead of after the last phi. This fixes a bug exposed by ScalarEvolution analyzing more kinds of loops. This fixes PR4436. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@74072 91177308-0d34-0410-b5e6-96231b3b80d8
* Fix ScalarEvolution's backedge-taken count computations to check forDan Gohman2009-06-21
| | | | | | | | | overflow when computing a integer division to round up. Thanks to Nick Lewycky for noticing this! git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@73862 91177308-0d34-0410-b5e6-96231b3b80d8
* Generalize isLoopGuardedByCond's checking to consider twoDan Gohman2009-06-20
| | | | | | | | | | | SCEVUnknowns with identical Instructions to be equal. This allows it to analze cases such as the attached testcase, where the front-end has cloned the loop controlling expression. Along with r73805, this lets IndVarSimplify eliminate all the sign-extend casts in the loop in the attached testcase. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@73807 91177308-0d34-0410-b5e6-96231b3b80d8
* Remove the code from IVUsers that attempted to handleDan Gohman2009-06-18
| | | | | | | | | | | | casted induction variables in cases where the cast isn't foldable. It ended up being a pessimization in many cases. This could be fixed, but it would require a bunch of complicated code in IVUsers' clients. The advantages of this approach aren't visible enough to justify it at this time. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@73706 91177308-0d34-0410-b5e6-96231b3b80d8
* Add -disable-output to a bunch of tests that don't care about the output.Dan Gohman2009-06-17
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@73633 91177308-0d34-0410-b5e6-96231b3b80d8
* Instcombine's ShrinkDemandedConstant may strip bits out of constants,Dan Gohman2009-06-16
| | | | | | | | | obscuring what would otherwise be a low-bits mask. Use ComputeMaskedBits to compute what ShrinkDemandedConstant knew about to reconstruct a low-bits mask value. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@73540 91177308-0d34-0410-b5e6-96231b3b80d8
* Implement more aggressive folding of add operand lists whenDan Gohman2009-06-14
| | | | | | | | | | | they contain multiplications of constants with add operations. This helps simplify several kinds of things; in particular it helps simplify expressions like ((-1 * (%a + %b)) + %a) to %b, as expressions like this often come up in loop trip count computations. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@73361 91177308-0d34-0410-b5e6-96231b3b80d8
* Teach SCEVExpander's visitAddRecExpr to reuse an existing canonicalDan Gohman2009-06-13
| | | | | | | | | | | | | | | | | | induction variable when the addrec to be expanded does not require a wider type. This eliminates the need for IndVarSimplify to micro-manage SCEV expansions, because SCEVExpander now automatically expands them in the form that IndVarSimplify considers to be canonical. (LSR still micro-manages its SCEV expansions, because it's optimizing for the target, rather than for other optimizations.) Also, this uses the new getAnyExtendExpr, which has more clever expression simplification logic than the IndVarSimplify code it replaces, and this cleans up some ugly expansions in code such as the included masked-iv.ll testcase. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@73294 91177308-0d34-0410-b5e6-96231b3b80d8
* Split the Add, Sub, and Mul instruction opcodes into separateDan Gohman2009-06-04
| | | | | | | | | | | | | | | | integer and floating-point opcodes, introducing FAdd, FSub, and FMul. For now, the AsmParser, BitcodeReader, and IRBuilder all preserve backwards compatability, and the Core LLVM APIs preserve backwards compatibility for IR producers. Most front-ends won't need to change immediately. This implements the first step of the plan outlined here: http://nondot.org/sabre/LLVMNotes/IntegerOverflow.txt git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@72897 91177308-0d34-0410-b5e6-96231b3b80d8
* Don't attempt to simplify an non-affine IV expression if it can'tDan Gohman2009-06-03
| | | | | | | be simplified to a loop-invariant value. This fixes PR4315. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@72798 91177308-0d34-0410-b5e6-96231b3b80d8
* Teach SCEVExpander to avoid creating over-indexed GEP indices whenDan Gohman2009-05-27
| | | | | | | | | | | | | possible. For example, it now emits %p.2.ip.1 = getelementptr [3 x [3 x double]]* %p, i64 2, i64 %tmp, i64 1 instead of the equivalent but less obvious %p.2.ip.1 = getelementptr [3 x [3 x double]]* %p, i64 0, i64 %tmp, i64 19 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@72452 91177308-0d34-0410-b5e6-96231b3b80d8
* In cases where a pointer value is an operand of a multiplication orDan Gohman2009-05-26
| | | | | | | | division operation, don't attempt to use the operation's value as the base of a getelementptr. This fixes PR4271. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@72422 91177308-0d34-0410-b5e6-96231b3b80d8
* When rewriting the loop exit test with the canonical induction variable,Dan Gohman2009-05-24
| | | | | | | | leave the original comparison in place if it has other uses, since the other uses won't be dominated by the new comparison instruction. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@72369 91177308-0d34-0410-b5e6-96231b3b80d8
* Generalize SCEVExpander::visitAddRecExpr's GEP persuit, and avoidDan Gohman2009-05-24
| | | | | | | | | | | | | | | | sending SCEVUnknowns to expandAddToGEP. This avoids the need for expandAddToGEP to bend the rules and peek into SCEVUnknown expressions. Factor out the code for testing whether a SCEV can be factored by a constant for use in a GEP index. This allows it to handle SCEVAddRecExprs, by recursing. As a result, SCEVExpander can now put more things in GEP indices, so it emits fewer explicit mul instructions. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@72366 91177308-0d34-0410-b5e6-96231b3b80d8
* The rewriter may hold references to instructions that are deleted because ↵Torok Edwin2009-05-24
| | | | | | | | | | | | they are trivially dead. Fix by clearing the rewriter cache before deleting the trivially dead instructions. Also make InsertedExpressions use an AssertingVH to catch these bugs easier. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@72364 91177308-0d34-0410-b5e6-96231b3b80d8
* Teach IndVarSimplify's FixUsesBeforeDefs to handle InvokeInsts byDan Gohman2009-05-22
| | | | | | | | | | | | | | | | assuming that the use of the value is in a block dominated by the "normal" destination. LangRef.html and other documentation sources don't explicitly guarantee this, but it seems to be assumed in other places in LLVM at least. This fixes an assertion failure on the included testcase, which is derived from the Ada testsuite. FixUsesBeforeDefs is a temporary measure which I'm looking to replace with a more capable solution. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@72266 91177308-0d34-0410-b5e6-96231b3b80d8
* Fix a thinko in the code that adapted SCEVMulExpr operands forDan Gohman2009-05-22
| | | | | | | | use in expanding SCEVAddExprs with GEPs. The operands of a SCEVMulExpr need to be multiplied together, not added. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@72250 91177308-0d34-0410-b5e6-96231b3b80d8
* Teach SCEVExpander to expand arithmetic involving pointers into GEPDan Gohman2009-05-19
| | | | | | | | | | | | | | | | | instructions. It attempts to create high-level multi-operand GEPs, though in cases where this isn't possible it falls back to casting the pointer to i8* and emitting a GEP with that. Using GEP instructions instead of ptrtoint+arithmetic+inttoptr helps pointer analyses that don't use ScalarEvolution, such as BasicAliasAnalysis. Also, make the AddrModeMatcher more aggressive in handling GEPs. Previously it assumed that operand 0 of a GEP would require a register in almost all cases. It now does extra checking and can do more matching if operand 0 of the GEP is foldable. This fixes a problem that was exposed by SCEVExpander using GEPs. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@72093 91177308-0d34-0410-b5e6-96231b3b80d8
* Add nounwind to a few tests.Dan Gohman2009-05-18
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@72002 91177308-0d34-0410-b5e6-96231b3b80d8
* Factor the code for collecting IV users out of LSR into an IVUsers class,Dan Gohman2009-05-12
| | | | | | | | | | | | | | | | | | | | | | | | | and generalize it so that it can be used by IndVarSimplify. Implement the base IndVarSimplify transformation code using IVUsers. This removes TestOrigIVForWrap and associated code, as ScalarEvolution now has enough builtin overflow detection and folding logic to handle all the same cases, and more. Run "opt -iv-users -analyze -disable-output" on your favorite loop for an example of what IVUsers does. This lets IndVarSimplify eliminate IV casts and compute trip counts in more cases. Also, this happens to finally fix the remaining testcases in PR1301. Now that IndVarSimplify is being more aggressive, it occasionally runs into the problem where ScalarEvolutionExpander's code for avoiding duplicate expansions makes it difficult to ensure that all expanded instructions dominate all the instructions that will use them. As a temporary measure, IndVarSimplify now uses a FixUsesBeforeDefs function to fix up instructions inserted by SCEVExpander. Fortunately, this code is contained, and can be easily removed once a more comprehensive solution is available. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@71535 91177308-0d34-0410-b5e6-96231b3b80d8
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