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2009-11-10Add defensive break.Duncan Sands
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@86705 91177308-0d34-0410-b5e6-96231b3b80d8
2009-11-10Fix obvious typo.Duncan Sands
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@86694 91177308-0d34-0410-b5e6-96231b3b80d8
2009-11-10clarify logic.Chris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@86689 91177308-0d34-0410-b5e6-96231b3b80d8
2009-11-10Teach DSE to eliminate useless trampolines.Duncan Sands
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@86683 91177308-0d34-0410-b5e6-96231b3b80d8
2009-11-10Add brackets to make gcc-4.4 happy.Duncan Sands
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@86681 91177308-0d34-0410-b5e6-96231b3b80d8
2009-11-10unify the code that determines whether it is a good idea to change the typeChris Lattner
of a computation. This fixes some infinite loops when dealing with TD that has no native types. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@86670 91177308-0d34-0410-b5e6-96231b3b80d8
2009-11-10Simplify.Nick Lewycky
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@86668 91177308-0d34-0410-b5e6-96231b3b80d8
2009-11-10Reapply r86359, "Teach dead store elimination that certain intrinsics write toNick Lewycky
memory just like a store" with bug fixed (partial-overwrite.ll is the regression test). git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@86667 91177308-0d34-0410-b5e6-96231b3b80d8
2009-11-10make jump threading recursively simplify expressions instead of doing it Chris Lattner
just one level deep. On the testcase we go from getting this: F1: ; preds = %T2 %F = and i1 true, %cond ; <i1> [#uses=1] br i1 %F, label %X, label %Y to a fully threaded: F1: ; preds = %T2 br label %Y This changes gets us to the point where we're forming (too many) switch instructions on doug's strswitch testcase. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@86646 91177308-0d34-0410-b5e6-96231b3b80d8
2009-11-10don't invalidate PN, rewrite of this code is in progress anyway.Chris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@86639 91177308-0d34-0410-b5e6-96231b3b80d8
2009-11-10add a new SimplifyInstruction API, which is like ConstantFoldInstruction, Chris Lattner
except that the result may not be a constant. Switch jump threading to use it so that it gets things like (X & 0) -> 0, which occur when phi preds are deleted and the remaining phi pred was a zero. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@86637 91177308-0d34-0410-b5e6-96231b3b80d8
2009-11-10Fix DenseMap iterator constness.Jeffrey Yasskin
This patch forbids implicit conversion of DenseMap::const_iterator to DenseMap::iterator which was possible because DenseMapIterator inherited (publicly) from DenseMapConstIterator. Conversion the other way around is now allowed as one may expect. The template DenseMapConstIterator is removed and the template parameter IsConst which specifies whether the iterator is constant is added to DenseMapIterator. Actually IsConst parameter is not necessary since the constness can be determined from KeyT but this is not relevant to the fix and can be addressed later. Patch by Victor Zverovich! git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@86636 91177308-0d34-0410-b5e6-96231b3b80d8
2009-11-10factor simplification logic for AND and OR out to InstSimplify from instcombine.Chris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@86635 91177308-0d34-0410-b5e6-96231b3b80d8
2009-11-09pull a bunch of logic out of instcombine into instsimplify for compare Chris Lattner
simplification, this handles the foldable fcmp x,x cases among many others. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@86627 91177308-0d34-0410-b5e6-96231b3b80d8
2009-11-09inline a simple function.Chris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@86625 91177308-0d34-0410-b5e6-96231b3b80d8
2009-11-09rename SimplifyCompare -> SimplifyCmpInst and split it into Chris Lattner
Simplify[IF]Cmp pieces. Add some predicates to CmpInst to determine whether a predicate is fp or int. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@86624 91177308-0d34-0410-b5e6-96231b3b80d8
2009-11-09use instructionsimplify instead of a weak clone of ad-hoc folding stuff.Chris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@86616 91177308-0d34-0410-b5e6-96231b3b80d8
2009-11-09stub out a new form of BasicBlock::RemovePredecessorAndSimplify whichChris Lattner
simplifies instruction users of PHIs when the phi is eliminated. This will be moved to transforms/utils after some other refactoring. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@86603 91177308-0d34-0410-b5e6-96231b3b80d8
2009-11-09if a 'with overflow' intrinsic just has the normal result used, simplifyChris Lattner
it to a normal binop. Patch by Alastair Lynn, testcase by me. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@86524 91177308-0d34-0410-b5e6-96231b3b80d8
2009-11-09fix PR5104: when printing a single character, return the result ofChris Lattner
putchar in case there is an error. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@86515 91177308-0d34-0410-b5e6-96231b3b80d8
2009-11-09enhance PHI slicing to handle the case when a slicable PHI is beginChris Lattner
used by a chain of other PHIs. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@86503 91177308-0d34-0410-b5e6-96231b3b80d8
2009-11-09Small cleanups.Owen Anderson
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@86499 91177308-0d34-0410-b5e6-96231b3b80d8
2009-11-09Revert my previous patch to ABCD and fix things the right way. There are ↵Owen Anderson
two problems addressed here: 1) We need to avoid processing sigma nodes as phi nodes for constraint generation. 2) We need to generate constraints for comparisons against constants properly. This includes our first working ABCD test! git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@86498 91177308-0d34-0410-b5e6-96231b3b80d8
2009-11-09comment typos pointed out by DuncanChris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@86497 91177308-0d34-0410-b5e6-96231b3b80d8
2009-11-08Fix an issue where the ordering of blocks within a function could lead to ↵Owen Anderson
different constraint graphs being produced. The cause was that we were incorrectly marking sigma instructions as processed after handling the sigma-specific constraints for them, potentially neglecting to process them as normal instructions as well. Unfortunately, the testcase that inspired this still doesn't work because of a bug in the solver, which is next on the list to debug. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@86486 91177308-0d34-0410-b5e6-96231b3b80d8
2009-11-08Teach an instcombine to not pull trunc instructions through PHI nodesChris Lattner
when both the source and dest are illegal types, since it would cause the phi to grow (for example, we shouldn't transform test14b's phi to a phi on i320). This fixes an infinite loop on i686 bootstrap with phi slicing turned on, so turn it back on. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@86483 91177308-0d34-0410-b5e6-96231b3b80d8
2009-11-08reapply r8644[3-5] with only the scary part Chris Lattner
(SliceUpIllegalIntegerPHI) disabled. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@86480 91177308-0d34-0410-b5e6-96231b3b80d8
2009-11-08Speculatively revert r8644[3-5], they seem to be leading to infinite loops inDaniel Dunbar
llvm-gcc bootstrap. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@86478 91177308-0d34-0410-b5e6-96231b3b80d8
2009-11-08teach a couple of instcombine transformations involving PHIs toChris Lattner
not turn a PHI in a legal type into a PHI of an illegal type, and add a new optimization that breaks up insane integer PHI nodes into small pieces (PR3451). git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@86443 91177308-0d34-0410-b5e6-96231b3b80d8
2009-11-07Improve tail call elimination to handle the switch statement.Nick Lewycky
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@86403 91177308-0d34-0410-b5e6-96231b3b80d8
2009-11-07make instcombine only rewrite a chain of computation Chris Lattner
(eliminating some extends) if the new type of the computation is legal or if both the source and dest are illegal. This prevents instcombine from changing big chains of computation into i64 on 32-bit targets for example. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@86398 91177308-0d34-0410-b5e6-96231b3b80d8
2009-11-07Revert r86359, it is breaking the self host on theChris Lattner
llvm-gcc-i386-darwin9 build bot. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@86391 91177308-0d34-0410-b5e6-96231b3b80d8
2009-11-07Teach dead store elimination that certain intrinsics write to memory just likeNick Lewycky
a store. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@86359 91177308-0d34-0410-b5e6-96231b3b80d8
2009-11-07reapply 86289, 86278, 86270, 86267, 86266 & 86264 plus a fixChris Lattner
(making pred factoring only happen if threading is guaranteed to be successful). This now survives an X86-64 bootstrap of llvm-gcc. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@86355 91177308-0d34-0410-b5e6-96231b3b80d8
2009-11-07Oops, FunctionContainsEscapingAllocas is really used to mean two differentNick Lewycky
things. Back out part of r86349 for a moment. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@86353 91177308-0d34-0410-b5e6-96231b3b80d8
2009-11-07Dust off tail recursion elimination. Fix a fixme by applying CaptureTrackingNick Lewycky
and add a .ll to demo the new capability. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@86349 91177308-0d34-0410-b5e6-96231b3b80d8
2009-11-07Revert following patches to fix llvmgcc bootstrap.Devang Patel
86289, 86278, 86270, 86267, 86266 & 86264 Chris, please take a look. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@86321 91177308-0d34-0410-b5e6-96231b3b80d8
2009-11-07Avoid "ambiguous 'else'" warning from gcc.Jeffrey Yasskin
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@86314 91177308-0d34-0410-b5e6-96231b3b80d8
2009-11-06Fix a bug where we'd call SplitBlockPredecessors with a pred in the Chris Lattner
set only once even if it has multiple edges to BB. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@86299 91177308-0d34-0410-b5e6-96231b3b80d8
2009-11-06Remove function left over from other jump threading cleanup.Eli Friedman
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@86289 91177308-0d34-0410-b5e6-96231b3b80d8
2009-11-06Fix a problem discovered on self host.Chris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@86278 91177308-0d34-0410-b5e6-96231b3b80d8
2009-11-06remove more code subsumed by r86264Chris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@86270 91177308-0d34-0410-b5e6-96231b3b80d8
2009-11-06eliminate some more code subsumed by r86264Chris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@86267 91177308-0d34-0410-b5e6-96231b3b80d8
2009-11-06remove now redundant code, r86264 handles this case.Chris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@86266 91177308-0d34-0410-b5e6-96231b3b80d8
2009-11-06Extend jump threading to support much more general threadingChris Lattner
predicates. This allows us to jump thread things like: _ZN12StringSwitchI5ColorE4CaseILj7EEERS1_RAT__KcRKS0_.exit119: %tmp1.i24166 = phi i8 [ 1, %bb5.i117 ], [ %tmp1.i24165, %_Z....exit ], [ %tmp1.i24165, %bb4.i114 ] %toBoolnot.i87 = icmp eq i8 %tmp1.i24166, 0 ; <i1> [#uses=1] %tmp4.i90 = icmp eq i32 %tmp2.i, 6 ; <i1> [#uses=1] %or.cond173 = and i1 %toBoolnot.i87, %tmp4.i90 ; <i1> [#uses=1] br i1 %or.cond173, label %bb4.i96, label %_ZN12... Where it is "obvious" that when coming from %bb5.i117 that the 'and' is always false. This triggers a surprisingly high number of times in the testsuite, and gets us closer to generating good code for doug's strswitch testcase. This also make a bunch of other code in jump threading redundant, I'll rip out in the next patch. This survived an enable-checking llvm-gcc bootstrap. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@86264 91177308-0d34-0410-b5e6-96231b3b80d8
2009-11-06remove some more Context arguments.Chris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@86235 91177308-0d34-0410-b5e6-96231b3b80d8
2009-11-06remove a bunch of extraneous LLVMContext argumentsChris Lattner
from various APIs, addressing PR5325. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@86231 91177308-0d34-0410-b5e6-96231b3b80d8
2009-11-05Teach LSR to avoid calling SplitCriticalEdge on edges with indirectbr.Dan Gohman
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@86193 91177308-0d34-0410-b5e6-96231b3b80d8
2009-11-05LoopDeletion depends on loops having dedicated exits.Dan Gohman
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@86180 91177308-0d34-0410-b5e6-96231b3b80d8
2009-11-05Update various Loop optimization passes to cope with the possibility thatDan Gohman
LoopSimplify form may not be available. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@86175 91177308-0d34-0410-b5e6-96231b3b80d8
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