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path: root/lib/Transforms/Scalar/IndVarSimplify.cpp
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2009-04-22Make sure both operands have binary instructions have the same type.Evan Cheng
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@69844 91177308-0d34-0410-b5e6-96231b3b80d8
2009-04-22A few more places where the check of use_empty is needed.Evan Cheng
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@69842 91177308-0d34-0410-b5e6-96231b3b80d8
2009-04-22Avoid deferencing use_begin() if value does not have a use.Evan Cheng
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@69836 91177308-0d34-0410-b5e6-96231b3b80d8
2009-04-21Introduce encapsulation for ScalarEvolution's TargetData object, and refactorDan Gohman
the code to minimize dependencies on TargetData. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@69644 91177308-0d34-0410-b5e6-96231b3b80d8
2009-04-18Use more const qualifiers with SCEV interfaces.Dan Gohman
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@69450 91177308-0d34-0410-b5e6-96231b3b80d8
2009-04-16Expand GEPs in ScalarEvolution expressions. SCEV expressions can nowDan Gohman
have pointer types, though in contrast to C pointer types, SCEV addition is never implicitly scaled. This not only eliminates the need for special code like IndVars' EliminatePointerRecurrence and LSR's own GEP expansion code, it also does a better job because it lets the normal optimizations handle pointer expressions just like integer expressions. Also, since LLVM IR GEPs can't directly index into multi-dimensional VLAs, moving the GEP analysis out of client code and into the SCEV framework makes it easier for clients to handle multi-dimensional VLAs the same way as other arrays. Some existing regression tests show improved optimization. test/CodeGen/ARM/2007-03-13-InstrSched.ll in particular improved to the point where if-conversion started kicking in; I turned it off for this test to preserve the intent of the test. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@69258 91177308-0d34-0410-b5e6-96231b3b80d8
2009-04-15Eliminate zext over (iv | const) or (signed iv),Dale Johannesen
and sext over (iv | const), if a longer iv is available. Allow expressions to have more than one zext/sext parent. All from OpenSSL. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@69241 91177308-0d34-0410-b5e6-96231b3b80d8
2009-04-15Eliminate zext over (iv & const) or ((iv+const)&const)Dale Johannesen
if a longer iv is available. These subscript forms are not common; they're a bottleneck in OpenSSL. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@69215 91177308-0d34-0410-b5e6-96231b3b80d8
2009-04-15Enhance induction variable code to remove theDale Johannesen
sext around sext(shorter IV + constant), using a longer IV instead, when it can figure out the add can't overflow. This comes up a lot in subscripting; mainly affects 64 bit. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@69123 91177308-0d34-0410-b5e6-96231b3b80d8
2009-02-24Rename ScalarEvolution's getIterationCount to getBackedgeTakenCount,Dan Gohman
to more accurately describe what it does. Expand its doxygen comment to describe what the backedge-taken count is and how it differs from the actual iteration count of the loop. Adjust names and comments in associated code accordingly. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@65382 91177308-0d34-0410-b5e6-96231b3b80d8
2009-02-23Back out the change in 64918 that used sign-extensions when promotingDan Gohman
trip counts that use signed comparisons. It's not obviously the best approach for preserving trip count information, and at any rate there isn't anything in the tree right now that makes use of that, so for now always using zero-extensions is preferable. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@65347 91177308-0d34-0410-b5e6-96231b3b80d8
2009-02-23IndVarSimplify preserves ScalarEvolution. In theDan Gohman
-std-compile-opts sequence, this avoids the need for ScalarEvolution to be rerun before LoopDeletion. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@65318 91177308-0d34-0410-b5e6-96231b3b80d8
2009-02-18Use a sign-extend instead of a zero-extend when promoting aDan Gohman
trip count value when the original loop iteration condition is signed and the canonical induction variable won't undergo signed overflow. This isn't required for correctness; it just preserves more information about original loop iteration values. Add a getTruncateOrSignExtend method to ScalarEvolution, following getTruncateOrZeroExtend. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@64918 91177308-0d34-0410-b5e6-96231b3b80d8
2009-02-18Simplify by using dyn_cast instead of isa and cast.Dan Gohman
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@64917 91177308-0d34-0410-b5e6-96231b3b80d8
2009-02-18Fix a corner case in the new indvars promotion logic: if thereDan Gohman
are multiple IV's in a loop, some of them may under go signed or unsigned wrapping even if the IV that's used in the loop exit condition doesn't. Restrict sign-extension-elimination and zero-extension-elimination to only those that operate on the original loop-controlling IV. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@64866 91177308-0d34-0410-b5e6-96231b3b80d8
2009-02-17Add a method to ScalarEvolution for telling it when a loop has beenDan Gohman
modified in a way that may effect the trip count calculation. Change IndVars to use this method when it rewrites pointer or floating-point induction variables instead of using a doInitialization method to sneak these changes in before ScalarEvolution has a chance to see the loop. This eliminates the need for LoopPass to depend on ScalarEvolution. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@64810 91177308-0d34-0410-b5e6-96231b3b80d8
2009-02-17Delete trailing whitespace.Dan Gohman
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@64784 91177308-0d34-0410-b5e6-96231b3b80d8
2009-02-17Fix 80-column violation.Dan Gohman
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@64766 91177308-0d34-0410-b5e6-96231b3b80d8
2009-02-17Simplify; fix some 80-column violations.Dan Gohman
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@64702 91177308-0d34-0410-b5e6-96231b3b80d8
2009-02-16Delete this long-commented-out code. The situation it seems to haveDan Gohman
been written for is no longer relevant with the elimination of signed and unsigned types. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@64625 91177308-0d34-0410-b5e6-96231b3b80d8
2009-02-14Extend the IndVarSimplify support for promoting induction variables:Dan Gohman
- Test for signed and unsigned wrapping conditions, instead of just testing for non-negative induction ranges. - Handle loops with GT comparisons, in addition to LT comparisons. - Support more cases of induction variables that don't start at 0. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@64532 91177308-0d34-0410-b5e6-96231b3b80d8
2009-02-14Clarify debug output.Dan Gohman
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@64531 91177308-0d34-0410-b5e6-96231b3b80d8
2009-02-14Simplify some code. hasComputableLoopEvolution is overkill in this case.Dan Gohman
No functionality change. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@64530 91177308-0d34-0410-b5e6-96231b3b80d8
2009-02-12Teach IndVarSimplify to optimize code using the C "int" type forDan Gohman
loop induction on LP64 targets. When the induction variable is used in addressing, IndVars now is usually able to inserst a 64-bit induction variable and eliminates the sign-extending cast. This is also useful for code using C "short" types for induction variables on targets with 32-bit addressing. Inserting a wider induction variable is easy; the tricky part is determining when trunc(sext(i)) expressions are no-ops. This requires range analysis of the loop trip count. A common case is when the original loop iteration starts at 0 and exits when the induction variable is signed-less-than a fixed value; this case is now handled. This replaces IndVarSimplify's OptimizeCanonicalIVType. It was doing the same optimization, but it was limited to loops with constant trip counts, because it was running after the loop rewrite, and the information about the original induction variable is lost by that point. Rename ScalarEvolution's executesAtLeastOnce to isLoopGuardedByCond, generalize it to be able to test for ICMP_NE conditions, and move it to be a public function so that IndVars can use it. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@64407 91177308-0d34-0410-b5e6-96231b3b80d8
2008-11-26Revert r60042. IndVarSimplify should check if APFloat is PPCDoubleDouble ↵Evan Cheng
first before trying to convert it to an integer. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@60072 91177308-0d34-0410-b5e6-96231b3b80d8
2008-11-18Cast to remove warning about comparing signed and unsigned.Bill Wendling
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@59518 91177308-0d34-0410-b5e6-96231b3b80d8
2008-11-18Give SIToFPInst preference over UIToFPInst because it is faster on platforms ↵Devang Patel
that are widely used. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@59476 91177308-0d34-0410-b5e6-96231b3b80d8
2008-11-17While handling floating point IVs lift restrictions on initial value and ↵Devang Patel
increment value. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@59471 91177308-0d34-0410-b5e6-96231b3b80d8
2008-11-17Handle floating point ivs during doInitialization().Devang Patel
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@59466 91177308-0d34-0410-b5e6-96231b3b80d8
2008-11-16eliminate some std::set's.Chris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@59409 91177308-0d34-0410-b5e6-96231b3b80d8
2008-11-03Turn floating point IVs into integer IVs where possible.Devang Patel
This allows SCEV users to effectively calculate trip count. LSR later on transforms back integer IVs to floating point IVs later on to avoid int-to-float casts inside the loop. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@58625 91177308-0d34-0410-b5e6-96231b3b80d8
2008-10-22Change create*Pass factory functions to return Pass* instead ofDaniel Dunbar
LoopPass*. - Although less precise, this means they can be used in clients without RTTI (who would otherwise need to include LoopPass.h, which eventually includes things using dynamic_cast). This was the simplest solution that presented itself, but I am happy to use a better one if available. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@58010 91177308-0d34-0410-b5e6-96231b3b80d8
2008-09-10fix white spaces.Devang Patel
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@56056 91177308-0d34-0410-b5e6-96231b3b80d8
2008-09-09if loop induction variable is always sign or zero extended then Devang Patel
extend the type of induction variable. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@56017 91177308-0d34-0410-b5e6-96231b3b80d8
2008-09-05Remove unused map.Devang Patel
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@55861 91177308-0d34-0410-b5e6-96231b3b80d8
2008-09-04Tidy up several unbeseeming casts from pointer to intptr_t.Dan Gohman
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@55779 91177308-0d34-0410-b5e6-96231b3b80d8
2008-08-05Pass the computed iteration count value to RewriteLoopExitValuesDan Gohman
instead of having it call getIterationCount again. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@54380 91177308-0d34-0410-b5e6-96231b3b80d8
2008-06-22Use Loop::block_iterator.Dan Gohman
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52616 91177308-0d34-0410-b5e6-96231b3b80d8
2008-06-13Use recently added getTruncateOrZeroExtend method to make the code shorter.Wojciech Matyjewicz
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52251 91177308-0d34-0410-b5e6-96231b3b80d8
2008-05-23Tidy up BasicBlock::getFirstNonPHI, and change a bunch of places toDan Gohman
use it instead of duplicating its functionality. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@51499 91177308-0d34-0410-b5e6-96231b3b80d8
2008-05-16API change for {BinaryOperator|CmpInst|CastInst}::create*() --> Create. ↵Gabor Greif
Legacy interfaces will be in place for some time. (Merge from use-diet branch.) git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@51200 91177308-0d34-0410-b5e6-96231b3b80d8
2008-05-13Clean up the use of static and anonymous namespaces. This turned upDan Gohman
several things that were neither in an anonymous namespace nor static but not intended to be global. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@51017 91177308-0d34-0410-b5e6-96231b3b80d8
2008-04-06API changes for class Use size reduction, wave 1.Gabor Greif
Specifically, introduction of XXX::Create methods for Users that have a potentially variable number of Uses. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@49277 91177308-0d34-0410-b5e6-96231b3b80d8
2007-12-29Remove attribution from file headers, per discussion on llvmdev.Chris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@45418 91177308-0d34-0410-b5e6-96231b3b80d8
2007-10-22Move the SCEV object factors from being static members of the individualDan Gohman
SCEV subclasses to being non-static member functions of the ScalarEvolution class. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@43224 91177308-0d34-0410-b5e6-96231b3b80d8
2007-09-10Require SCEV before LCSSA.Devang Patel
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@41798 91177308-0d34-0410-b5e6-96231b3b80d8
2007-09-04Update GEP constructors to use an iterator interface to fixDavid Greene
GLIBCXX_DEBUG issues. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@41697 91177308-0d34-0410-b5e6-96231b3b80d8
2007-08-21Use SmallVector instead of std::vector.Devang Patel
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@41207 91177308-0d34-0410-b5e6-96231b3b80d8
2007-06-27Fix a bug.Zhou Sheng
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@37751 91177308-0d34-0410-b5e6-96231b3b80d8
2007-06-19Rename ScalarEvolution::deleteInstructionFromRecords toDan Gohman
deleteValueFromRecords and loosen the types to all it to accept Value* instead of just Instruction*, since this is what ScalarEvolution uses internally anyway. This allows more flexibility for future uses. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@37657 91177308-0d34-0410-b5e6-96231b3b80d8
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