tree d3399d4fe1917a0c5f0c50e0de7201a88a4c5c50
parent 14c44b95b3dcb8ff1d627e6b78f57c4373d375cb
author George Spelvin <linux@sciencehorizons.net> 1464188769 -0400
committer George Spelvin <linux@sciencehorizons.net> 1464464938 -0400

microblaze: Add <asm/hash.h>

Microblaze is an FPGA soft core that can be configured various ways.

If it is configured without a multiplier, the standard __hash_32()
will require a call to __mulsi3, which is a slow software loop.

Instead, use a shift-and-add sequence for the constant multiply.
GCC knows how to do this, but it's not as clever as some.

Signed-off-by: George Spelvin <linux@sciencehorizons.net>
Cc: Alistair Francis <alistair.francis@xilinx.com>
Cc: Michal Simek <michal.simek@xilinx.com>