aarch64-builtins.c: Builtins for rsqrt and rsqrtf.

aarch64-builtins.c: Builtins for rsqrt and rsqrtf.

2015-11-06  Benedikt Huber  <benedikt.huber@theobroma-systems.com>
	    Philipp Tomsich  <philipp.tomsich@theobroma-systems.com>

	* config/aarch64/aarch64-builtins.c: Builtins for rsqrt and rsqrtf.
	* config/aarch64/aarch64-protos.h: Declare.
	* config/aarch64/aarch64-simd.md: Matching expressions for frsqrte and
	frsqrts.
	* config/aarch64/aarch64-tuning-flags.def: Added recip_sqrt.
	* config/aarch64/aarch64.c: New functions. Emit rsqrt estimation code when
	applicable.
	* config/aarch64/aarch64.md: Added enum entries.
	* config/aarch64/aarch64.opt: Added option -mlow-precision-recip-sqrt.
	* testsuite/gcc.target/aarch64/rsqrt_asm_check_common.h: Common macros for
	assembly checks.
	* testsuite/gcc.target/aarch64/rsqrt_asm_check_negative_1.c: Make sure
	frsqrts and frsqrte are not emitted.
	* testsuite/gcc.target/aarch64/rsqrt_asm_check_1.c: Make sure frsqrts and
	frsqrte are emitted.
	* testsuite/gcc.target/aarch64/rsqrt_1.c: Functional tests for rsqrt.

Signed-off-by: Philipp Tomsich <philipp.tomsich@theobroma-systems.com>
Co-Authored-By: Philipp Tomsich <philipp.tomsich@theobroma-systems.com>
From-SVN: r229866