llvm-project

Commit Graph

Author	SHA1	Message	Date
Sanjoy Das	81401d4b19	Fix PR22179. We were incorrectly inferring nsw for certain SCEVs. We can be more aggressive here (see Richard Smith's comment on http://llvm.org/bugs/show_bug.cgi?id=22179) but this change just focuses on correctness. Differential Revision: http://reviews.llvm.org/D6914 llvm-svn: 225591	2015-01-10 23:41:24 +00:00
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

Author

SHA1

Message

Date

Sanjoy Das

81401d4b19

Fix PR22179.

We were incorrectly inferring nsw for certain SCEVs. We can be more
aggressive here (see Richard Smith's comment on
http://llvm.org/bugs/show_bug.cgi?id=22179) but this change just
focuses on correctness.

Differential Revision: http://reviews.llvm.org/D6914

llvm-svn: 225591

2015-01-10 23:41:24 +00:00

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

3 Commits