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Author SHA1 Message Date
Chris Lattner
5187cfcf03 Merge Operation into OperationInst and standardize nomenclature around 
OperationInst.  This is a big mechanical patch.

This is step 16/n towards merging instructions and statements, NFC.

PiperOrigin-RevId: 227093712
 2019-03-29 14:42:23 -07:00
Chris Lattner
776b035646 Eliminate the Instruction, BasicBlock, CFGFunction, MLFunction, and ExtFunction classes, using the Statement/StmtBlock hierarchy and Function instead. 
This *only* changes the internal data structures, it does not affect the user visible syntax or structure of MLIR code.  Function gets new "isCFG()" sorts of predicates as a transitional measure.

This patch is gross in a number of ways, largely in an effort to reduce the amount of mechanical churn in one go.  It introduces a bunch of using decls to keep the old names alive for now, and a bunch of stuff needs to be renamed.

This is step 10/n towards merging instructions and statements, NFC.

PiperOrigin-RevId: 227044402
 2019-03-29 14:39:49 -07:00
River Riddle
7669a259c4 Add a simple common sub expression elimination pass. 
The algorithm collects defining operations within a scoped hash table. The scopes within the hash table correspond to nodes within the dominance tree for a function. This cl only adds support for simple operations, i.e non side-effecting. Such operations, e.g. load/store/call, will be handled in later patches.

PiperOrigin-RevId: 223811328
 2019-03-29 14:14:28 -07:00