Commit Graph

35 Commits

Author SHA1 Message Date
Chris Lattner
084df627c8 add plumbing for handling multiple result nodes
in some more places.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@99366 91177308-0d34-0410-b5e6-96231b3b80d8
2010-03-24 00:41:19 +00:00
Chris Lattner
aac5b5b2e5 eliminate the last use of EEVT::isUnknown
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@98918 91177308-0d34-0410-b5e6-96231b3b80d8
2010-03-19 01:14:27 +00:00
Chris Lattner
48aa5756a2 add some helper functions and implement isContradictory
for CheckValueTypeMatcher.  The isContradictory implementation
helps us factor better, shrinking x86 table from 79144 -> 78896
bytes.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@97905 91177308-0d34-0410-b5e6-96231b3b80d8
2010-03-07 06:29:26 +00:00
Chris Lattner
cfe2eab744 introduce a new SwitchTypeMatcher node (which is analogous to
SwitchOpcodeMatcher) and have DAGISelMatcherOpt form it.  This
speeds up selection, particularly for X86 which has lots of 
variants of instructions with only type differences.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@97645 91177308-0d34-0410-b5e6-96231b3b80d8
2010-03-03 06:28:15 +00:00
Chris Lattner
c6d7ad3c7d Rewrite chain handling validation and input TokenFactor handling
stuff now that we don't care about emulating the old broken 
behavior of the old isel.  This eliminates the 
'CheckChainCompatible' check (along with IsChainCompatible) which
did an incorrect and inefficient scan *up* the chain nodes which
happened as the pattern was being formed and does the validation
at the end in HandleMergeInputChains when it forms a structural 
pattern.  This scans "down" the graph, which means that it is
quickly bounded by nodes already selected.  This also handles
token factors that get "trapped" in the dag.

Removing the CheckChainCompatible nodes also shrinks the 
generated tables by about 6K for X86 (down to 83K).

There are two pieces remaining before I can nuke PreprocessRMW:
1. I xfailed a test because we're now producing worse code in a 
   case that has nothing to do with the change: it turns out that
   our use of MorphNodeTo will leave dead nodes in the graph
   which (depending on how the graph is walked) end up causing
   bogus uses of chains and blocking matches.  This is really 
   bad for other reasons, so I'll fix this in a follow-up patch.

2. CheckFoldableChainNode needs to be improved to handle the TF.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@97539 91177308-0d34-0410-b5e6-96231b3b80d8
2010-03-02 02:22:10 +00:00
Chris Lattner
fa342faef9 eliminate the CheckMultiOpcodeMatcher code and have each
ComplexPattern at the root be generated multiple times, once
for each opcode they are part of.  This encourages factoring
because the opcode checks get treated just like everything
else in the matcher.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@97439 91177308-0d34-0410-b5e6-96231b3b80d8
2010-03-01 07:17:40 +00:00
Chris Lattner
eb66921adb add a new OPC_SwitchOpcode which is semantically equivalent
to a scope where every child starts with a CheckOpcode, but
executes more efficiently.  Enhance DAGISelMatcherOpt to 
form it.

This also fixes a bug in CheckOpcode: apparently the SDNodeInfo
objects are not pointer comparable, we have to compare the
enum name.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@97438 91177308-0d34-0410-b5e6-96231b3b80d8
2010-03-01 06:59:22 +00:00
Chris Lattner
ff7fb60f2a enhance the EmitNode/MorphNodeTo operands to take a bit that
specifies whether there is an output flag or not.  Use this
instead of redundantly encoding the chain/flag results in the
output vtlist.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@97419 91177308-0d34-0410-b5e6-96231b3b80d8
2010-02-28 21:53:42 +00:00
Chris Lattner
9a21500edc use MorphNodeTo instead of SelectNodeTo. SelectNodeTo
is just a silly wrapper around MorphNodeTo.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@97416 91177308-0d34-0410-b5e6-96231b3b80d8
2010-02-28 20:55:18 +00:00
Chris Lattner
c78f2a3994 enhance the new isel to use SelectNodeTo for most patterns,
even some the old isel didn't.  There are several parts of
this that make me feel dirty, but it's no worse than the
old isel.  I'll clean up the parts I can do without ripping
out the old one next.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@97415 91177308-0d34-0410-b5e6-96231b3b80d8
2010-02-28 20:49:53 +00:00
Chris Lattner
6281cda673 enhance EmitNodeMatcher to keep track of the recorded slot numbers
it will populate.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@97363 91177308-0d34-0410-b5e6-96231b3b80d8
2010-02-28 02:41:25 +00:00
Chris Lattner
e86097af55 add infrastructure to support forming selectnodeto. Not used yet
because I have to go on another detour first.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@97362 91177308-0d34-0410-b5e6-96231b3b80d8
2010-02-28 02:31:26 +00:00
Chris Lattner
225798143d Generalize my hack to use SDNodeInfo to find out when a
node is always guaranteed to have a particular type 
instead of hacking in ISD::STORE explicitly.  This allows
us to use implied types for a broad range of nodes, even
target specific ones.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@97355 91177308-0d34-0410-b5e6-96231b3b80d8
2010-02-28 00:22:30 +00:00
Chris Lattner
a230f9623d change CheckOpcodeMatcher to hold the SDNodeInfo instead of
the opcode name.  This gives the optimizer more semantic info.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@97346 91177308-0d34-0410-b5e6-96231b3b80d8
2010-02-27 21:48:43 +00:00
Chris Lattner
255584aaa6 add another case from the ppc backend. This is obviously a huge and
dissatisfying hack.  TODO: Improve it. :)


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@97317 91177308-0d34-0410-b5e6-96231b3b80d8
2010-02-27 08:19:47 +00:00
Chris Lattner
247896272a teach the optimizer that opcode == ISD::STORE is contradictory
with getType() == MVT::i32 etc.  Teach it that two different
integer constants are contradictory.  This cuts 1K off the X86
table, down to 98k



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@97314 91177308-0d34-0410-b5e6-96231b3b80d8
2010-02-27 08:11:15 +00:00
Chris Lattner
82781b938a Teach the grouper some simple tricks about looking contradictory
predicates.  For example if we have:

Scope:
  CheckType i32
    ABC
  CheckType f32
    DEF
  CheckType i32
    GHI

Then we know that we can transform this into:
Scope:
  CheckType i32
    Scope
      ABC
      GHI
  CheckType f32
    DEF

This reorders the check for the 'GHI' predicate above
the check for the 'DEF' predidate.  However it is safe to do this
in this situation because we know that a node cannot have both an
i32 and f32 type.

We're now doing more factoring that the old isel did.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@97312 91177308-0d34-0410-b5e6-96231b3b80d8
2010-02-27 07:49:13 +00:00
Chris Lattner
d6c84720df change the scope node to include a list of children to be checked
instead of to have a chained series of scope nodes.  This makes
the generated table smaller, improves the efficiency of the
interpreter, and make the factoring optimization much more 
reasonable to implement.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@97160 91177308-0d34-0410-b5e6-96231b3b80d8
2010-02-25 19:00:39 +00:00
Chris Lattner
a5028a6463 factor the print method better.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@97125 91177308-0d34-0410-b5e6-96231b3b80d8
2010-02-25 06:53:39 +00:00
Chris Lattner
58aa834d31 add methods to do equality checks and get hashes of Matchers
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@97123 91177308-0d34-0410-b5e6-96231b3b80d8
2010-02-25 06:49:58 +00:00
Chris Lattner
b21ba71045 rename fooMatcherNode to fooMatcher.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@97096 91177308-0d34-0410-b5e6-96231b3b80d8
2010-02-25 02:04:40 +00:00
Chris Lattner
60df53e30a rename PushMatcherNode -> ScopeMatcherNode to more accurately
reflect what it does.  Switch the sense of the Next and the Check
arms to be more logical.  No functionality change.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@97093 91177308-0d34-0410-b5e6-96231b3b80d8
2010-02-25 01:56:48 +00:00
Chris Lattner
23cfda719e contract movechild+checktype into a new checkchild node, shrinking the
x86 table by 1200 bytes.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@97053 91177308-0d34-0410-b5e6-96231b3b80d8
2010-02-24 20:15:25 +00:00
Chris Lattner
19b5a7590b implement a simple proof-of-concept optimization for
the new isel: fold movechild+record+moveparent into a
single recordchild N node.  This shrinks the X86 table
from 125443 to 117502 bytes.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@97031 91177308-0d34-0410-b5e6-96231b3b80d8
2010-02-24 07:31:45 +00:00
Chris Lattner
02f73585f7 The new isel was not properly handling patterns that covered
internal nodes with flag results.  Record these with a new 
OPC_MarkFlagResults opcode and use this to update the interior
nodes' flag results properly.  This fixes CodeGen/X86/i256-add.ll
with the new isel.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@97021 91177308-0d34-0410-b5e6-96231b3b80d8
2010-02-24 05:33:42 +00:00
Chris Lattner
12a667c1e8 add a new CheckMultiOpcode opcode for checking that a node
has one of the list of acceptable opcodes for a complex 
pattern.  This fixes 4 regtest failures.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@96814 91177308-0d34-0410-b5e6-96231b3b80d8
2010-02-22 22:30:37 +00:00
Chris Lattner
77f2e2724d implement the last known missing feature: updating uses of results
of the matched pattern to use the newly created node results.  Onto
the "making it actually work" phase!



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@96724 91177308-0d34-0410-b5e6-96231b3b80d8
2010-02-21 06:03:07 +00:00
Chris Lattner
8e946bea14 Lots of improvements to the new dagisel emitter. This gets it to
the point where it is to the 95% feature complete mark, it just
needs result updating to be done (then testing, optimization 
etc).

More specificallly, this adds support for chain and flag handling
on the result nodes, support for sdnodexforms, support for variadic
nodes, memrefs, pinned physreg inputs, and probably lots of other
stuff.

In the old DAGISelEmitter, this deletes the dead code related to
OperatorMap, cleans up a variety of dead stuff handling "implicit
remapping" from things like globaladdr -> targetglobaladdr (which
is no longer used because globaladdr always needs to be legalized),
and some minor formatting fixes.




git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@96716 91177308-0d34-0410-b5e6-96231b3b80d8
2010-02-21 03:22:59 +00:00
Chris Lattner
845c042734 add support for referencing registers and immediates,
building the tree to represent them but not emitting 
table entries for them yet.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@96617 91177308-0d34-0410-b5e6-96231b3b80d8
2010-02-18 22:03:03 +00:00
Chris Lattner
bd8227f529 rename the child field to 'next'. This is not a parent/child
relationship, this is a linear list relationship.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@96561 91177308-0d34-0410-b5e6-96231b3b80d8
2010-02-18 02:53:41 +00:00
Chris Lattner
8ef9c7958a eliminate the MatcherNodeWithChild class, give the 'child'
field to MatcherNode.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@96560 91177308-0d34-0410-b5e6-96231b3b80d8
2010-02-18 02:49:24 +00:00
Chris Lattner
9a747f1305 Emulate the current isel's "IsChainCompatible" logic for now.
I'd like to eventually rip it out, but for now producing the
same selections as the old matcher is more important.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@96458 91177308-0d34-0410-b5e6-96231b3b80d8
2010-02-17 06:23:39 +00:00
Chris Lattner
21390d7984 convert the new matcher to check intermediate nodes for a single
use and only call IsProfitableToFold/IsLegalToFold on the load
being folded, like the old dagiselemitter does.  This 
substantially simplifies the code and improves opportunities for
sharing.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@96368 91177308-0d34-0410-b5e6-96231b3b80d8
2010-02-16 19:15:55 +00:00
Chris Lattner
e39650a805 add support for the new isel matcher to generate
(isprofitable|islegal)tofold checks.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@96331 91177308-0d34-0410-b5e6-96231b3b80d8
2010-02-16 06:10:58 +00:00
Chris Lattner
da272d1a70 Check in the first big step of rewriting DAGISelEmitter to
produce a table based matcher instead of gobs of C++ Code.

Though it's not done yet, the shrinkage seems promising,
the table for the X86 ISel is 75K and still has a lot of 
optimization to come (compare to the ~1.5M of .o generated
the old way, much of which will go away).

The code is currently disabled by default (the #if 0 in
DAGISelEmitter.cpp).  When enabled it generates a dead
SelectCode2 function in the DAGISel Header which will
eventually replace SelectCode.

There is still a lot of stuff left to do, which are
documented with a trail of FIXMEs.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@96215 91177308-0d34-0410-b5e6-96231b3b80d8
2010-02-15 08:04:42 +00:00