[PATCH] Improve performance of vector code on A15

[Joey Gouly]

Minor thing: You should be using a triple slash /// for documentation
(especially for A15SDOptimizer::runOnMachineInstruction), and 
I think they have to go above the function.

Joey

-----Original Message-----
From: llvm-commits-bounces at cs.uiuc.edu
[mailto:llvm-commits-bounces at cs.uiuc.edu] On Behalf Of James Molloy
Sent: 21 February 2013 18:14
To: llvm-commits
Cc: Silviu Baranga
Subject: [PATCH] Improve performance of vector code on A15

Hi,

Attached is a patch which improves performance of vector code on
Cortex-A15.

Certain code sequences, where an S register is written but read as a D
register, can execute slowly. This patch defines a pass which detects
when SPRs are written but read as DPRs and inserts code sequences which,
although nonobvious, make code run much quicker.

The second patch, implicit-ops.diff, fixes an unrelated bug with
implicit defs/uses that happens to impact the A15 pass's efficiency.

Please review!

Cheers,

James

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