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path: root/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
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2005-08-31Fix a mistake in my previous patch pointed out by sabre; the AssertZextNate Begeman
case in MaskedValueIsZero was wrong. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@23165 91177308-0d34-0410-b5e6-96231b3b80d8
2005-08-31Remove some unnecessary casts, and add the AssertZext case toNate Begeman
MaskedValueIsZero. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@23164 91177308-0d34-0410-b5e6-96231b3b80d8
2005-08-30Allow physregs to occur in the dag with multiple types. Though I don't ↵Chris Lattner
likethis, it is a requirement on PPC, which can have an f32 value in r3 at onepoint in a function and a f64 value in r3 at another point. :( This fixes compilation of mesa git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@23161 91177308-0d34-0410-b5e6-96231b3b80d8
2005-08-30Remove a bogus piece of my AssertSext/AssertZext patch. oops.Nate Begeman
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@23148 91177308-0d34-0410-b5e6-96231b3b80d8
2005-08-30Add support for AssertSext and AssertZext, folding other extensions withNate Begeman
them. This allows for elminination of redundant extends in the entry blocks of functions on PowerPC. Add support for i32 x i32 -> i64 multiplies, by recognizing when the inputs to ISD::MUL in ExpandOp are actually just extended i32 values and not real i64 values. this allows us to codegen int mulhs(int a, int b) { return ((long long)a * b) >> 32; } as: _mulhs: mulhw r3, r4, r3 blr instead of: _mulhs: mulhwu r2, r4, r3 srawi r5, r3, 31 mullw r5, r4, r5 add r2, r2, r5 srawi r4, r4, 31 mullw r3, r4, r3 add r3, r2, r3 blr with a similar improvement on x86. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@23147 91177308-0d34-0410-b5e6-96231b3b80d8
2005-08-29Add a new API for NateChris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@23131 91177308-0d34-0410-b5e6-96231b3b80d8
2005-08-28Fix a bug in ReplaceAllUsesWithChris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@23122 91177308-0d34-0410-b5e6-96231b3b80d8
2005-08-26Checking types here is not safe, because multiple types can map to the sameChris Lattner
register class. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@23103 91177308-0d34-0410-b5e6-96231b3b80d8
2005-08-26Revampt ReplaceAllUsesWith to be more efficient and easier to use.Chris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@23087 91177308-0d34-0410-b5e6-96231b3b80d8
2005-08-26Change ConstantPoolSDNode to actually hold the Constant itself instead ofChris Lattner
putting it into the constant pool. This allows the isel machinery to create constants that it will end up deciding are not needed, without them ending up in the resultant function constant pool. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@23081 91177308-0d34-0410-b5e6-96231b3b80d8
2005-08-26Fix a huge annoyance: SelectNodeTo took types before the opcode unlikeChris Lattner
every other SD API. Fix it to take the opcode before the types. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@23079 91177308-0d34-0410-b5e6-96231b3b80d8
2005-08-26Fix a nasty bug from a previous patch of mineChris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@23069 91177308-0d34-0410-b5e6-96231b3b80d8
2005-08-25New fold for SELECT_CCNate Begeman
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@23058 91177308-0d34-0410-b5e6-96231b3b80d8
2005-08-25Don't auto-cse nodes that return flagsChris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@23055 91177308-0d34-0410-b5e6-96231b3b80d8
2005-08-25simplify the code a bit using isOperationLegalChris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@23053 91177308-0d34-0410-b5e6-96231b3b80d8
2005-08-25ADd support for TargetConstantPool nodesChris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@23041 91177308-0d34-0410-b5e6-96231b3b80d8
2005-08-25add a new TargetFrameIndex nodeChris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@23035 91177308-0d34-0410-b5e6-96231b3b80d8
2005-08-24add a methodChris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@23027 91177308-0d34-0410-b5e6-96231b3b80d8
2005-08-24Add ReplaceAllUsesWith that can take a vector of replacement values.Chris Lattner
Add some foldings to hopefully help the illegal setcc issue, and move some code around. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@23025 91177308-0d34-0410-b5e6-96231b3b80d8
2005-08-24teach selection dag mask tracking about the fact that select_cc operates likeChris Lattner
select. Also teach it that the bit count instructions can only set the low bits of the result, depending on the size of the input. This allows us to compile this: int %eq0(int %a) { %tmp.1 = seteq int %a, 0 ; <bool> [#uses=1] %tmp.2 = cast bool %tmp.1 to int ; <int> [#uses=1] ret int %tmp.2 } To this: _eq0: cntlzw r2, r3 srwi r3, r2, 5 blr instead of this: _eq0: cntlzw r2, r3 rlwinm r3, r2, 27, 31, 31 blr when setcc is marked illegal on ppc (which restores parity to non-illegal setcc). Thanks to Nate for pointing this out. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@23013 91177308-0d34-0410-b5e6-96231b3b80d8
2005-08-24Teach SelectionDAG how to simplify a few more setcc-equivalent select_ccNate Begeman
nodes so that backends don't have to. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@22999 91177308-0d34-0410-b5e6-96231b3b80d8
2005-08-24Fix optimization of select_cc seteq X, 0, 1, 0 -> srl (ctlz X), log2 X sizeNate Begeman
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@22995 91177308-0d34-0410-b5e6-96231b3b80d8
2005-08-23Teach the SelectionDAG how to transform select_cc eq, X, 0, 1, 0 intoNate Begeman
either seteq X, 0 or srl (ctlz X), size(X-1), depending on what's legal for the target. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@22978 91177308-0d34-0410-b5e6-96231b3b80d8
2005-08-21add anew methodChris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@22957 91177308-0d34-0410-b5e6-96231b3b80d8
2005-08-21add a methodChris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@22955 91177308-0d34-0410-b5e6-96231b3b80d8
2005-08-21add a methodChris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@22949 91177308-0d34-0410-b5e6-96231b3b80d8
2005-08-19Add support for TargetGlobalAddress nodesChris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@22938 91177308-0d34-0410-b5e6-96231b3b80d8
2005-08-19Fix a bug in previous commitChris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@22936 91177308-0d34-0410-b5e6-96231b3b80d8
2005-08-19Print physreg register nodes with target names (e.g. F1) instead of numbersChris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@22934 91177308-0d34-0410-b5e6-96231b3b80d8
2005-08-19Fix VC++ precedence warning.Jeff Cohen
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@22902 91177308-0d34-0410-b5e6-96231b3b80d8
2005-08-18Add support for target DAG nodes that take 4 operands, such as PowerPC'sNate Begeman
rlwinm. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@22856 91177308-0d34-0410-b5e6-96231b3b80d8
2005-08-18Fix printing of VTSDNodesChris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@22853 91177308-0d34-0410-b5e6-96231b3b80d8
2005-08-17Move the code dependency for MathExtras.h from SelectionDAGNodes.h.Jim Laskey
Added some class dividers in SelectionDAG.cpp. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@22841 91177308-0d34-0410-b5e6-96231b3b80d8
2005-08-17Culling out use of unions for converting FP to bits and vice versa.Jim Laskey
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@22838 91177308-0d34-0410-b5e6-96231b3b80d8
2005-08-17Fix a bug in RemoveDeadNodes where it would crash when its "optional"Chris Lattner
argument is not specified. Implement ReplaceAllUsesWith. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@22834 91177308-0d34-0410-b5e6-96231b3b80d8
2005-08-17add a new TargetConstant nodeChris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@22813 91177308-0d34-0410-b5e6-96231b3b80d8
2005-08-16Eliminate the RegSDNode class, which 3 nodes (CopyFromReg/CopyToReg/ImplicitDef)Chris Lattner
used to tack a register number onto the node. Instead of doing this, make a new node, RegisterSDNode, which is a leaf containing a register number. These three operations just become normal DAG nodes now, instead of requiring special handling. Note that with this change, it is no longer correct to make illegal CopyFromReg/CopyToReg nodes. The legalizer will not touch them, and this is bad, so don't do it. :) git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@22806 91177308-0d34-0410-b5e6-96231b3b80d8
2005-08-16Implement BR_CC and BRTWOWAY_CC. This allows the removal of a rather nastyNate Begeman
fixme from the PowerPC backend. Emit slightly better code for legalizing select_cc. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@22805 91177308-0d34-0410-b5e6-96231b3b80d8
2005-08-16Allow passing a dag into dump and getOperationName. If one is availableChris Lattner
when printing a node, use it to render target operations with their target instruction name instead of "<<unknown>>". git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@22804 91177308-0d34-0410-b5e6-96231b3b80d8
2005-08-16Add some methods for dag->dag isel.Chris Lattner
Split RemoveNodeFromCSEMaps out of DeleteNodesIfDead to do it. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@22801 91177308-0d34-0410-b5e6-96231b3b80d8
2005-08-13Remove an unncessary argument to SimplifySelectCC and add an additionalNate Begeman
assert when creating a select_cc node. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@22780 91177308-0d34-0410-b5e6-96231b3b80d8
2005-08-13Fix the fabs regression on x86 by abstracting the select_cc optimizationNate Begeman
out into SimplifySelectCC. This allows both ISD::SELECT and ISD::SELECT_CC to use the same set of simplifying folds. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@22779 91177308-0d34-0410-b5e6-96231b3b80d8
2005-08-12implement a couple of simple shift foldings.Chris Lattner
e.g. (X & 7) >> 3 -> 0 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@22774 91177308-0d34-0410-b5e6-96231b3b80d8
2005-08-11Add a select_cc optimization for recognizing abs(int). This speeds up anNate Begeman
integer MPEG encoding loop by a factor of two. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@22758 91177308-0d34-0410-b5e6-96231b3b80d8
2005-08-11Some SELECT_CC cleanups:Nate Begeman
1. move assertions for node creation to getNode() 2. legalize the values returned in ExpandOp immediately 3. Move select_cc optimizations from SELECT's getNode() to SELECT_CC's, allowing them to be cleaned up significantly. This paves the way to pick up additional optimizations on SELECT_CC, such as sum-of-absolute-differences. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@22757 91177308-0d34-0410-b5e6-96231b3b80d8
2005-08-10Add new node, SELECT_CC. This node is for targets that don't nativelyNate Begeman
implement SELECT. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@22755 91177308-0d34-0410-b5e6-96231b3b80d8
2005-08-10Fix an oversight that may be causing PR617.Chris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@22753 91177308-0d34-0410-b5e6-96231b3b80d8
2005-08-09Fix spelling, fix some broken canonicalizations by my last patchChris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@22734 91177308-0d34-0410-b5e6-96231b3b80d8
2005-08-09add cc nodes to the AllNodes list so they show up in Graphviz outputChris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@22731 91177308-0d34-0410-b5e6-96231b3b80d8
2005-08-09Eliminate the SetCCSDNode in favor of a CondCodeSDNode class. This pulls theChris Lattner
CC out of the SetCC operation, making SETCC a standard ternary operation and CC's a standard DAG leaf. This will make it possible for other node to use CC's as operands in the future... git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@22728 91177308-0d34-0410-b5e6-96231b3b80d8
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