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path: root/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
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2005-10-13Move some Legalize functionality over to the DAGCombiner where it belongs.Nate Begeman
Kill some dead code. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@23706 91177308-0d34-0410-b5e6-96231b3b80d8
2005-10-12Fix a potential bug with two combine-to's back to back that chris pointedNate Begeman
out, where after the first CombineTo() call, the node the second CombineTo wishes to replace may no longer exist. Fix a very real bug with the truncated load optimization on little endian targets, which do not need a byte offset added to the load. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@23704 91177308-0d34-0410-b5e6-96231b3b80d8
2005-10-12More cool stuff for the dag combiner. We can now finally handle thingsNate Begeman
like turning: _foo: fctiwz f0, f1 stfd f0, -8(r1) lwz r2, -4(r1) rlwinm r3, r2, 0, 16, 31 blr into _foo: fctiwz f0,f1 stfd f0,-8(r1) lhz r3,-2(r1) blr Also removed an unncessary constraint from sra -> srl conversion, which should take care of hte only reason we would ever need to handle sra in MaskedValueIsZero, AFAIK. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@23703 91177308-0d34-0410-b5e6-96231b3b80d8
2005-10-11Fix a powerpc crash on CodeGen/Generic/llvm-ct-intrinsics.llChris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@23694 91177308-0d34-0410-b5e6-96231b3b80d8
2005-10-11Add a canonicalization that got lost, fixing PowerPC/fold-li.ll:SUBChris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@23693 91177308-0d34-0410-b5e6-96231b3b80d8
2005-10-10clean up some corner casesChris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@23692 91177308-0d34-0410-b5e6-96231b3b80d8
2005-10-10Implement trivial DSE. If two stores are neighbors and store to the sameChris Lattner
location, replace them with a new store of the last value. This occurs in the same neighborhood in 197.parser, speeding it up about 1.5% git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@23691 91177308-0d34-0410-b5e6-96231b3b80d8
2005-10-10Add support for CombineTo, allowing the dag combiner to replace nodes withChris Lattner
multiple results. Use this support to implement trivial store->load forwarding, implementing CodeGen/PowerPC/store-load-fwd.ll. Though this is the most simple case and can be extended in the future, it is still useful. For example, it speeds up 197.parser by 6.2% by avoiding an LSU reject in xalloc: stw r6, lo16(l5_end_of_array)(r2) addi r2, r5, -4 stwx r5, r4, r2 - lwzx r5, r4, r2 - rlwinm r5, r5, 0, 0, 30 stwx r5, r4, r2 lwz r2, -4(r4) ori r2, r2, 1 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@23690 91177308-0d34-0410-b5e6-96231b3b80d8
2005-10-10Teach the DAGCombiner several new tricks, teaching it how to turnNate Begeman
sext_inreg into zext_inreg based on the signbit (fires a lot), srem into urem, etc. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@23688 91177308-0d34-0410-b5e6-96231b3b80d8
2005-10-10Fix commentChris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@23686 91177308-0d34-0410-b5e6-96231b3b80d8
2005-10-10Add ISD::ADD to MaskedValueIsZeroChris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@23685 91177308-0d34-0410-b5e6-96231b3b80d8
2005-10-09add a todo for something I noticedChris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@23679 91177308-0d34-0410-b5e6-96231b3b80d8
2005-10-09(X & Y) & C == 0 if either X&C or Y&C are zeroChris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@23678 91177308-0d34-0410-b5e6-96231b3b80d8
2005-10-08Lo and behold, the last bits of SelectionDAG.cpp have been moved over.Nate Begeman
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@23665 91177308-0d34-0410-b5e6-96231b3b80d8
2005-10-07implement CodeGen/PowerPC/div-2.ll:test2-4 by propagating zero bits throughChris Lattner
C-X's git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@23662 91177308-0d34-0410-b5e6-96231b3b80d8
2005-10-07Turn sdivs into udivs when we can prove the sign bits are clear. ThisChris Lattner
implements CodeGen/PowerPC/div-2.ll git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@23659 91177308-0d34-0410-b5e6-96231b3b80d8
2005-10-05Check in some more DAGCombiner piecesNate Begeman
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@23639 91177308-0d34-0410-b5e6-96231b3b80d8
2005-10-05implement visitBR_CC so that PowerPC/inverted-bool-compares.ll passesChris Lattner
with the dag combiner. This speeds up espresso by 8%, reaching performance parity with the dag-combiner-disabled llc. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@23636 91177308-0d34-0410-b5e6-96231b3b80d8
2005-10-05Add a new HandleNode class, which is used to handle (haha) cases in theChris Lattner
dead node elim and dag combiner passes where the root is potentially updated. This fixes a fixme in the dag combiner. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@23634 91177308-0d34-0410-b5e6-96231b3b80d8
2005-10-05Implement the code for PowerPC/inverted-bool-compares.ll, even though itChris Lattner
that testcase still does not pass with the dag combiner. This is because not all forms of br* are folded yet. Also, when we combine a node into another one, delete the node immediately instead of waiting for the node to potentially come up in the future. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@23632 91177308-0d34-0410-b5e6-96231b3b80d8
2005-10-05Fix a crash compiling Olden/tspChris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@23630 91177308-0d34-0410-b5e6-96231b3b80d8
2005-09-28Add FP versions of the binary operators, keeping the int and fp worlds seperate.Chris Lattner
Though I have done extensive testing, it is possible that this will break things in configs I can't test. Please let me know if this causes a problem and I'll fix it ASAP. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@23504 91177308-0d34-0410-b5e6-96231b3b80d8
2005-09-19Stub out the rest of the DAG Combiner. Just need to fill in theNate Begeman
select_cc bits and then wrap it in a convenience function for use with regular select. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@23389 91177308-0d34-0410-b5e6-96231b3b80d8
2005-09-16More DAG combining. Still need the branch instructions, and select_ccNate Begeman
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@23371 91177308-0d34-0410-b5e6-96231b3b80d8
2005-09-09Add a missing #include, patch courtesy of Baptiste Lepilleur.Chris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@23302 91177308-0d34-0410-b5e6-96231b3b80d8
2005-09-09Last round of 2-node folds from SD.cpp. Will move on to 3 node ops suchNate Begeman
as setcc and select next. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@23295 91177308-0d34-0410-b5e6-96231b3b80d8
2005-09-08Move yet more folds over to the dag combiner from sd.cppNate Begeman
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@23278 91177308-0d34-0410-b5e6-96231b3b80d8
2005-09-07Another round of dag combiner changes. This fixes some missing XOR foldsNate Begeman
as well as fixing how we replace old values with new values. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@23260 91177308-0d34-0410-b5e6-96231b3b80d8
2005-09-07Implement a common missing fold, (add (add x, c1), c2) -> (add x, c1+c2).Nate Begeman
This restores all of stanford to being identical with and without the dag combiner with the add folding turned off in sd.cpp. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@23258 91177308-0d34-0410-b5e6-96231b3b80d8
2005-09-07Add an option to the DAG Combiner to enable it for beta runs, and turn onNate Begeman
that option for PowerPC's beta. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@23253 91177308-0d34-0410-b5e6-96231b3b80d8
2005-09-06Next round of DAGCombiner changes. This version now passes all the testsNate Begeman
I have run so far when run before Legalize. It still needs to pick up the SetCC folds, and nodes that use SetCC. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@23243 91177308-0d34-0410-b5e6-96231b3b80d8
2005-09-02Next round of DAG Combiner changes. Just need to support multiple returnNate Begeman
values, and then we should be able to hook it up. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@23231 91177308-0d34-0410-b5e6-96231b3b80d8
2005-09-01Implement first round of feedback from chris (there's still a couple thingsNate Begeman
left to do). git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@23195 91177308-0d34-0410-b5e6-96231b3b80d8
2005-09-01Add the rest of the currently implemented visit routines to the switchNate Begeman
statement in visit(). git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@23185 91177308-0d34-0410-b5e6-96231b3b80d8
2005-09-01First pass at the DAG Combiner. It isn't used anywhere yet, but it shouldNate Begeman
be mostly functional. It currently has all folds from SelectionDAG.cpp that do not involve a condition code. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@23184 91177308-0d34-0410-b5e6-96231b3b80d8
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