[PATCH] AArch64: Add libc_feholdsetround_noex_aarch64_ctx

[Wilco]

Hi,

This patch adds new function libc_feholdsetround_noex_aarch64_ctx, enabling 
further optimization. libc_feholdsetround_aarch64_ctx now only needs to 
read the FPCR in the typical case, avoiding a redundant FPSR read.
Performance results show a good improvement (5-10% on sin()) on cores with
expensive FPCR/FPSR instructions.

OK for commit?

Wilco

ChangeLog:
2014-06-11  Wilco  <wdijkstr@arm.com>

	* sysdeps/aarch64/fpu/math_private.h
	(libc_feholdsetround_noex_aarch64_ctx): New function.
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