re PR target/56843 (PowerPC Newton-Raphson reciprocal estimates can be improved)

re PR target/56843 (PowerPC Newton-Raphson reciprocal estimates can be improved)

gcc:

2013-04-05  Bill Schmidt  <wschmidt@linux.vnet.ibm.com>

	PR target/56843
	* config/rs6000/rs6000.c (rs6000_emit_swdiv_high_precision): Remove.
	(rs6000_emit_swdiv_low_precision): Remove.
	(rs6000_emit_swdiv): Rewrite to handle between one and four
	iterations of Newton-Raphson generally; modify required number of
	iterations for some cases.
	* config/rs6000/rs6000.h (RS6000_RECIP_HIGH_PRECISION_P): Remove.

gcc/testsuite:

2013-04-05  Bill Schmidt  <wschmidt@linux.vnet.ibm.com>

	PR target/56843
	* gcc.target/powerpc/recip-1.c: Modify expected output.
	* gcc.target/powerpc/recip-3.c: Likewise.
	* gcc.target/powerpc/recip-4.c: Likewise.
	* gcc.target/powerpc/recip-5.c: Add expected output for iterations.

From-SVN: r197534