Add backend support for NEON's VABD

Registered by Michael Hope on 2011-09-07

Dmitry Melnik posted a patch that implements VADB (absolute difference):
 http://gcc.gnu.org/ml/gcc-patches/2011-07/msg02654.html

This improves the size and performance of x264. Ramana had some feedback. No response has been seen yet.

Blueprint information

Status:
Complete
Approver:
Michael Hope
Priority:
Low
Drafter:
Michael Hope
Direction:
Approved
Assignee:
Michael Hope
Definition:
Approved
Series goal:
Accepted for 4.6
Implementation:
Implemented
Milestone target:
milestone icon 4.6-2011.10
Started by
Michael Hope on 2011-10-03
Completed by
Michael Hope on 2011-10-13

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Headline: Improve performance and size by generating the VFP absolute difference instruction
Acceptance: https://wiki.linaro.org/WorkingGroups/ToolChain/std-performance-acceptance

Follow up:
 http://gcc.gnu.org/ml/gcc-patches/2011-09/msg00733.html

Approval:
 http://gcc.gnu.org/ml/gcc-patches/2011-09/msg00735.html

(?)

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