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59 Commits

Author SHA1 Message Date
Chris Lattner
a03051b9c4 Add a pattern (x+0) -> x, generalize Canonicalize to CFGFunc's, address a few TODOs, 
and add some casting support to Operation.

PiperOrigin-RevId: 218219340
 2019-03-29 13:35:33 -07:00
Chris Lattner
7850258c49 Introduce a new Operation::erase helper to generalize some code in 
the pattern matcher / canonicalizer, and rename existing eraseFromBlock methods
to align with it.

PiperOrigin-RevId: 218104455
 2019-03-29 13:34:51 -07:00
Chris Lattner
73a802741e Introduce a new PatternRewriter class to help keep the worklist in 
PatternMatcher clients up to date and provide a funnel point for newly added
operations.  This is also progress towards the canonicalizer supporting
CFGFunctions.

This paves the way for more complex patterns, but by itself doesn't do much
useful, so no testcase.

PiperOrigin-RevId: 218101737
 2019-03-29 13:34:23 -07:00
Feng Liu
34927e2474 Rename Operation::getAs to Operation::dyn_cast 
Also rename Operation::is to Operation::isa
Introduce Operation::cast

All of these are for consistency with global dyn_cast/cast/isa operators.

PiperOrigin-RevId: 217878786
 2019-03-29 13:33:41 -07:00
Jacques Pienaar
47e7cd333e Use FuncBuilder instead of MLFuncBuilder in pattern matcher. 
Use the general function buil wrapper instead of the CFG/ML specific one.

PiperOrigin-RevId: 217335607
 2019-03-29 13:31:59 -07:00
Chris Lattner
80e884a9f8 Add constant folding and binary operator reassociation to the canonicalize 
pass, build up the worklist infra in anticipation of improving the pattern
matcher to match more than one node.

PiperOrigin-RevId: 217330579
 2019-03-29 13:31:44 -07:00
Feng Liu
0faf563383 Move Pattern and related classes to a different file 
So we can use it as a library.

PiperOrigin-RevId: 217267049
 2019-03-29 13:31:03 -07:00
Chris Lattner
7e7157fd1d Various improvements to pattern matching and other infra: 
- Make it so OpPointer implicitly converts to SSAValue* when the underlying op
   has a single value.  This eliminates a lot more ->getResult() calls and makes
   the behavior more LLVM-like
 - Fill out PatternBenefit to be typed instead of just a typedef for int with
   magic numbers.
 - Simplify various code due to these changes.

PiperOrigin-RevId: 217020717
 2019-03-29 13:29:49 -07:00
Chris Lattner
9e3b928e32 Implement a super sketched out pattern match/rewrite framework and a sketched 
out canonicalization pass to drive it, and a simple (x-x) === 0 pattern match
as a test case.

There is a tremendous number of improvements that need to land, and the
matcher/rewriter and patterns will be split out of this file, but this is a
starting point.

PiperOrigin-RevId: 216788604
 2019-03-29 13:29:07 -07:00