[AArch64] Give some new costs for Cortex-A53 floating-point operations

James Greenhalgh james.greenhalgh@arm.com
Mon Jun 20 13:57:00 GMT 2016


Hi,

As recently done for Cortex-A57 [1], this patch rebases the floating-point
cost table for Cortex-A53 to be relative to the cost of a floating-point move.
I wrote a little more on the justification for doing this in the other patch,
but in summary this is what other targets and sub-targets do, so we should
fall in line with that.

Unlike the Cortex-A57 changes, this had no performance impact across
Spec2000 and Spec2006. I'm posting it to keep the strategy for costs
aligned between the two cores.

Bootstrapped on aarch64-none-linux-gnu and arm-none-linux-gnueabihf with
no issues.

OK?

Thanks,
James

[1]: https://gcc.gnu.org/ml/gcc-patches/2016-06/msg00251.html

---
2016-06-20  James Greenhalgh  <james.greenhalgh@arm.com>

	* config/arm/aarch-cost-tables.h (cortexa53_extra_costs): Make FP
	costs relative to the cost of a register move.
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