Commit Graph

2 Commits

Author SHA1 Message Date
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
Quentin Colombet ea18933d97 [X86] Implement TargetLowering::getScalingFactorCost hook.
Scaling factors are not free on X86 because every "complex" addressing mode
breaks the related instruction into 2 allocations instead of 1.

<rdar://problem/16730541>

llvm-svn: 207301
2014-04-26 01:11:26 +00:00