Quentin Colombet c88baa5c10 [LSR] Canonicalize reg1 + ... + regN into reg1 + ... + 1*regN. ...

This commit introduces a canonical representation for the formulae.
Basically, as soon as a formula has more that one base register, the scaled
register field is used for one of them. The register put into the scaled
register is preferably a loop variant.
The commit refactors how the formulae are built in order to produce such
representation.
This yields a more accurate, but still perfectible, cost model.

<rdar://problem/16731508>

llvm-svn: 209230

2014-05-20 19:25:04 +00:00

1.8 KiB

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