Re: [PATCH], Add power9 support to GCC, patch #3 (scalar count trailing zeros)

[Michael Meissner <meissner at linux dot vnet dot ibm dot com>]

This patch adds support for scalar count trailing zeros instruction that is
being added to ISA 3.0 (power9).

I have built this patch (along with patches #2 and #4) with a bootstrap build
on a power8 little endian system.  There were no regressions in the test
suite.  Is this patch ok to install in the trunk once patch #1 has been
installed.

[gcc]
2015-11-08  Michael Meissner  <meissner@linux.vnet.ibm.com>

	* config/rs6000/rs6000.c (rs6000_rtx_costs): Update costs for
	count trailing zero instruction if we have hardware support.

	* config/rs6000/rs6000.h (TARGET_CTZ): Add support for count
	trailing zero instruction in ISA 3.0.
	* config/rs6000/rs6000.c (ctz<mode>2): Likewise.
	(ctz<mode>2_h): Likewise.

[gcc/testsuite]
2015-11-08  Michael Meissner  <meissner@linux.vnet.ibm.com>

	* gcc.target/powerpc/ctz-1.c: Add test for count trailing zero
	instruciton support.
	* gcc.target/powerpc/ctz-2.c: Likewise.

-- 
Michael Meissner, IBM
IBM, M/S 2506R, 550 King Street, Littleton, MA 01460-6245, USA
email: meissner@linux.vnet.ibm.com, phone: +1 (978) 899-4797

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