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2011-02-10A bunch of cleanups and simplifications using the new PatternMatch predicatesChris Lattner
and generally tidying things up. Only very trivial functionality changes like now doing (-1 - A) -> (~A) for vectors too. InstCombineAddSub.cpp | 296 +++++++++++++++++++++----------------------------- 1 file changed, 126 insertions(+), 170 deletions(-) git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@125264 91177308-0d34-0410-b5e6-96231b3b80d8
2011-02-10teach SimplifyDemandedBits that exact shifts demand the bits they Chris Lattner
are shifting out since they do require them to be zeros. Similarly for NUW/NSW bits of shl git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@125263 91177308-0d34-0410-b5e6-96231b3b80d8
2011-02-10Revert this in an attempt to bring the builders back.Eric Christopher
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@125257 91177308-0d34-0410-b5e6-96231b3b80d8
2011-02-10Turn this pass ordering:Cameron Zwarich
Natural Loop Information Loop Pass Manager Canonicalize natural loops Scalar Evolution Analysis Loop Pass Manager Induction Variable Users Canonicalize natural loops Induction Variable Users Loop Strength Reduction into this: Scalar Evolution Analysis Loop Pass Manager Canonicalize natural loops Induction Variable Users Loop Strength Reduction This fixes <rdar://problem/8869639>. I also filed PR9184 on doing this sort of thing automatically, but it seems easier to just change the ordering of the passes if this is the only case. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@125254 91177308-0d34-0410-b5e6-96231b3b80d8
2011-02-09Teach instsimplify some tricks about exact/nuw/nsw shifts.Chris Lattner
improve interfaces to instsimplify to take this info. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@125196 91177308-0d34-0410-b5e6-96231b3b80d8
2011-02-09Rework InstrTypes.h so to reduce the repetition around the NSW/NUW/ExactChris Lattner
versions of creation functions. Eventually, the "insertion point" versions of these should just be removed, we do have IRBuilder afterall. Do a massive rewrite of much of pattern match. It is now shorter and less redundant and has several other widgets I will be using in other patches. Among other changes, m_Div is renamed to m_IDiv (since it only matches integer divides) and m_Shift is gone (it used to match all binops!!) and we now have m_LogicalShift for the one client to use. Enhance IRBuilder to have "isExact" arguments to things like CreateUDiv and reduce redundancy within IRbuilder by having these methods chain to each other more instead of duplicating code. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@125194 91177308-0d34-0410-b5e6-96231b3b80d8
2011-02-09When removing a function from the function set and adding it to deferred, weNick Lewycky
could end up removing a different function than we intended because it was functionally equivalent, then end up with a comparison of a function against itself in the next round of comparisons (the one in the function set and the one on the deferred list). To fix this, I introduce a choice in the form of comparison for ComparableFunctions, either normal or "pointer only" used to find exact Function*'s in lookups. Also add some debugging statements. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@125180 91177308-0d34-0410-b5e6-96231b3b80d8
2011-02-08Don't split any loop backedges, including backedges of loops other thanDan Gohman
the active loop. This is generally desirable, and it avoids trouble in situations such as the testcase in PR9123, though the failure mode depends on use-list order, so it is infeasible to test. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@125065 91177308-0d34-0410-b5e6-96231b3b80d8
2011-02-07SimplifyCFG: Track the number of used icmps when turning a icmp chain into a ↵Benjamin Kramer
switch. If we used only one icmp, don't turn it into a switch. Also prevent the switch-to-icmp transform from creating identity adds, noticed by Marius Wachtler. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@125056 91177308-0d34-0410-b5e6-96231b3b80d8
2011-02-06enhance vmcore to know that udiv's can be exact, and add a trivialChris Lattner
instcombine xform to exercise this. Nothing forms exact udivs yet though. This is progress on PR8862 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@124992 91177308-0d34-0410-b5e6-96231b3b80d8
2011-02-06Simplify away redundant test, and document what's going on.Nick Lewycky
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@124977 91177308-0d34-0410-b5e6-96231b3b80d8
2011-02-06Remove specialized comparison of InlineAsm objects. They're uniqued on creationNick Lewycky
now, and this wasn't comparing some of their relevant bits anyhow. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@124976 91177308-0d34-0410-b5e6-96231b3b80d8
2011-02-03SimplifyCFG: Also transform switches that represent a range comparison but ↵Benjamin Kramer
are not sorted into sub+icmp. This transforms another 1000 switches in gcc.c. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@124826 91177308-0d34-0410-b5e6-96231b3b80d8
2011-02-02SimplifyCFG: Turn switches into sub+icmp+branch if possible.Benjamin Kramer
This makes the job of the later optzn passes easier, allowing the vast amount of icmp transforms to chew on it. We transform 840 switches in gcc.c, leading to a 16k byte shrink of the resulting binary on i386-linux. The testcase from README.txt now compiles into decl %edi cmpl $3, %edi sbbl %eax, %eax andl $1, %eax ret git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@124724 91177308-0d34-0410-b5e6-96231b3b80d8
2011-02-02Remove wasteful caching. This isn't needed for correctness because any functionNick Lewycky
that might have changed been affected by a merge elsewhere will have been removed from the function set, and it isn't needed for performance because we call grow() ahead of time to prevent reallocations. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@124717 91177308-0d34-0410-b5e6-96231b3b80d8
2011-02-02Conservatively, clear optional flags, such as nsw, when performingDan Gohman
reassociation. No testcase, because I wasn't able to create a testcase which actually demonstrates a problem. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@124713 91177308-0d34-0410-b5e6-96231b3b80d8
2011-02-02Fix reassociate to clear optional flags, such as nsw.Dan Gohman
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@124712 91177308-0d34-0410-b5e6-96231b3b80d8
2011-01-30Recognize and simplifyAnders Carlsson
(A+B) == A -> B == 0 A == (A+B) -> B == 0 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@124567 91177308-0d34-0410-b5e6-96231b3b80d8
2011-01-29Unbreak the MSVC build.Francois Pichet
The DEBUG() call at line 606 demands to see raw_ostream's definition. I have no idea why this seems to only break MSVC. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@124545 91177308-0d34-0410-b5e6-96231b3b80d8
2011-01-29Call SimplifyFDivInst() in InstCombiner::visitFDiv().Frits van Bommel
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@124535 91177308-0d34-0410-b5e6-96231b3b80d8
2011-01-29Move InstCombine's knowledge of fdiv to SimplifyInstruction().Frits van Bommel
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@124534 91177308-0d34-0410-b5e6-96231b3b80d8
2011-01-29Add a test for TCE return duplication.Evan Cheng
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@124527 91177308-0d34-0410-b5e6-96231b3b80d8
2011-01-29Re-apply r124518 with fix. Watch out for invalidated iterator.Evan Cheng
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@124526 91177308-0d34-0410-b5e6-96231b3b80d8
2011-01-29Revert r124518. It broke Linux self-host.Evan Cheng
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@124522 91177308-0d34-0410-b5e6-96231b3b80d8
2011-01-29Re-commit r124462 with fixes. Tail recursion elim will now dup ret into ↵Evan Cheng
unconditional predecessor to enable TCE on demand. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@124518 91177308-0d34-0410-b5e6-96231b3b80d8
2011-01-29Implementation of path profiling.Andrew Trick
Modified patch by Adam Preuss. This builds on the existing framework for block tracing, edge profiling and optimal edge profiling. See -help-hidden for new flags. For documentation, see the technical report "Implementation of Path Profiling..." in llvm.org/pubs. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@124515 91177308-0d34-0410-b5e6-96231b3b80d8
2011-01-28My auto-simplifier noticed that ((X/Y)*Y)/Y occurs several times in SPECDuncan Sands
benchmarks, and that it can be simplified to X/Y. (In general you can only simplify (Z*Y)/Y to Z if the multiplication did not overflow; if Z has the form "X/Y" then this is the case). This patch implements that transform and moves some Div logic out of instcombine and into InstructionSimplify. Unfortunately instcombine gets in the way somewhat, since it likes to change (X/Y)*Y into X-(X rem Y), so I had to teach instcombine about this too. Finally, thanks to the NSW/NUW flags, sometimes we know directly that "Z*Y" does not overflow, because the flag says so, so I added that logic too. This eliminates a bunch of divisions and subtractions in 447.dealII, and has good effects on some other benchmarks too. It seems to have quite an effect on tramp3d-v4 but it's hard to say if it's good or bad because inlining decisions changed, resulting in massive changes all over. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@124487 91177308-0d34-0410-b5e6-96231b3b80d8
2011-01-28Rename functions to follow coding standard. Also rejiggers comments. NoNick Lewycky
functionality change. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@124482 91177308-0d34-0410-b5e6-96231b3b80d8
2011-01-28Add a doxygen comment for this class.Nick Lewycky
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@124480 91177308-0d34-0410-b5e6-96231b3b80d8
2011-01-28Reorder for readability. (Chris, is this what you meant?)Nick Lewycky
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@124479 91177308-0d34-0410-b5e6-96231b3b80d8
2011-01-28Revert r124462. There are a few big regressions that I need to fix first.Evan Cheng
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@124478 91177308-0d34-0410-b5e6-96231b3b80d8
2011-01-28Reduce the number of functions we look at in the first pass, and preallocateNick Lewycky
the function equality set. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@124475 91177308-0d34-0410-b5e6-96231b3b80d8
2011-01-28Fold select + select where both selects are on the same condition.Nick Lewycky
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@124469 91177308-0d34-0410-b5e6-96231b3b80d8
2011-01-28- Stop simplifycfg from duplicating "ret" instructions into unconditionalEvan Cheng
branches. PR8575, rdar://5134905, rdar://8911460. - Allow codegen tail duplication to dup small return blocks after register allocation is done. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@124462 91177308-0d34-0410-b5e6-96231b3b80d8
2011-01-27Unbreak the build.Benjamin Kramer
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@124426 91177308-0d34-0410-b5e6-96231b3b80d8
2011-01-27Expound upon this comparison!Nick Lewycky
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@124406 91177308-0d34-0410-b5e6-96231b3b80d8
2011-01-27Use dyn_cast instead of isa+cast.Nick Lewycky
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@124404 91177308-0d34-0410-b5e6-96231b3b80d8
2011-01-27Fix surprising missed optimization in mergefunc where we forgot to considerNick Lewycky
that relationships like "i8* null" is equivalent to "i32* null". git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@124368 91177308-0d34-0410-b5e6-96231b3b80d8
2011-01-26Fix PR9039, a use-after-free in reassociate. The issue was that theDuncan Sands
operand being factorized (and erased) could occur several times in Ops, resulting in freed memory being used when the next occurrence in Ops was analyzed. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@124287 91177308-0d34-0410-b5e6-96231b3b80d8
2011-01-26AttrListPtr has an overloaded operator== which does this for us, we should useNick Lewycky
it. No functionality change! git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@124286 91177308-0d34-0410-b5e6-96231b3b80d8
2011-01-26Teach mergefunc that intptr_t is the same width as a pointer. We still can'tNick Lewycky
merge vector<intptr_t>::push_back() and vector<void*>::push_back() because Enumerate() doesn't realize that "i64* null" and "i8** null" are equivalent. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@124285 91177308-0d34-0410-b5e6-96231b3b80d8
2011-01-26There are no vectors of pointer or arrays, so we don't need to check vectorNick Lewycky
elements for type equivalence. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@124284 91177308-0d34-0410-b5e6-96231b3b80d8
2011-01-25Teach mergefunc how to emit aliases safely again -- but keep it turned it offNick Lewycky
for now. It's controlled by the HasGlobalAliases variable which is not attached to any flag yet. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@124182 91177308-0d34-0410-b5e6-96231b3b80d8
2011-01-24Give GetUnderlyingObject a TargetData, to keep it in syncDan Gohman
with BasicAA's DecomposeGEPExpression, which recently began using a TargetData. This fixes PR8968, though the testcase is awkward to reduce. Also, update several off GetUnderlyingObject's users which happen to have a TargetData handy to pass it in. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@124134 91177308-0d34-0410-b5e6-96231b3b80d8
2011-01-24fix PR9017, a bug where we'd assert when promoting in unreachableChris Lattner
code. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@124100 91177308-0d34-0410-b5e6-96231b3b80d8
2011-01-24fix PR9015, a crash linking recursive metadata.Chris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@124099 91177308-0d34-0410-b5e6-96231b3b80d8
2011-01-24enhance SRoA to promote allocas that are used by PHI nodes. This oftenChris Lattner
occurs because instcombine sinks loads and inserts phis. This kicks in on such apps as 175.vpr, eon, 403.gcc, xalancbmk and a bunch of times in spec2006 in some app that uses std::deque. This resolves the last of rdar://7339113. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@124090 91177308-0d34-0410-b5e6-96231b3b80d8
2011-01-23Enhance SRoA to promote allocas that are used by selects in someChris Lattner
common cases. This triggers a surprising number of times in SPEC2K6 because min/max idioms end up doing this. For example, code from the STL ends up looking like this to SRoA: %202 = load i64* %__old_size, align 8, !tbaa !3 %203 = load i64* %__old_size, align 8, !tbaa !3 %204 = load i64* %__n, align 8, !tbaa !3 %205 = icmp ult i64 %203, %204 %storemerge.i = select i1 %205, i64* %__n, i64* %__old_size %206 = load i64* %storemerge.i, align 8, !tbaa !3 We can now promote both the __n and the __old_size allocas. This addresses another chunk of rdar://7339113, poor codegen on stringswitch. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@124088 91177308-0d34-0410-b5e6-96231b3b80d8
2011-01-23Null initialize a few variables flagged byTed Kremenek
clang's -Wuninitialized-experimental warning. While these don't look like real bugs, clang's -Wuninitialized-experimental analysis is stricter than GCC's, and these fixes have the benefit of being general nice cleanups. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@124073 91177308-0d34-0410-b5e6-96231b3b80d8
2011-01-23Enhance SRoA to be more aggressive about scalarization of aggregate allocasChris Lattner
that have PHI or select uses of their element pointers. This can often happen when instcombine sinks two loads into a successor, inserting a phi or select. With this patch, we can scalarize the alloca, but the pinned elements are not yet promoted. This is still a win for large aggregates where only one element is used. This fixes rdar://8904039 and part of rdar://7339113 (poor codegen on stringswitch). git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@124070 91177308-0d34-0410-b5e6-96231b3b80d8
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