spi: bcm2835: Micro-optimise FIFO loops

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The blind and counted loops are always called with nonzero count, so
convert them to do-while loops that lead to slightly more efficient
code generation. With GCC 8.3 this shaves off 1-2 instructions per
iteration in each case.

Signed-off-by: Robin Murphy <robin.murphy@arm.com>
Link: https://lore.kernel.org/r/9242863077acf9a64e4b3720e479855b88d19e82.1592261248.git.robin.murphy@arm.com
Signed-off-by: Mark Brown <broonie@kernel.org>

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Robin Murphy 2020-06-16 01:09:29 +01:00 • committed by Mark Brown

parent afe7e36360

commit 26751de25d

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drivers/spi/spi-bcm2835.c

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