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ssvb Improve Cortex-A7 cpuburn

Improve Cortex-A7 cpuburn

Appears that the litecoin miner (https://github.com/pooler/cpuminer)
compined with NEON support disabled was heating the CPU more than
cpuburn-a7 implementation.

So instead of mostly relying on floating point calculations, try
the approach similar to the one used in cpuburn-krait and go for
the highest IPC using only ARM instructions. Also borrow the
unaligned LDR instructions from cpuburn-a53. The end result is
quite good.

Testing on the Orange Pi PC board clocked at 1.2GHz (current
draw increase relative to idle):
    Old cpuburn-a7  : +290mA
    litecoin miner  : +380mA
    New cpuburn-a7  : +580mA

Signed-off-by: Siarhei Siamashka <siarhei.siamashka@gmail.com>

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README.md

cpuburn

A collection of cpuburn programs tuned for different ARM hardware

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A collection of cpuburn programs tuned for different ARM hardware

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