gcc/testsuite/ChangeLog:

2017-05-11  Kelvin Nilsen  <kelvin@gcc.gnu.org>

	* gcc.target/powerpc/cmpb-1.c: New test.
	* gcc.target/powerpc/cmpb-2.c: New test.
	* gcc.target/powerpc/cmpb-3.c: New test.
	* gcc.target/powerpc/cmpb32-1.c: New test.
	* gcc.target/powerpc/cmpb32-2.c: New test.

gcc/ChangeLog:

2017-05-11  Kelvin Nilsen  <kelvin@gcc.gnu.org>

	* config/rs6000/rs6000-c.c (altivec_overloaded_builtins): Add
	array entries to represent two legal parameterizations of the
	overloaded __builtin_cmpb function, as represented by the
	P6_OV_BUILTIN_CMPB constant.
	(altivec_resolve_overloaded_builtin): Add special case handling
	for the __builtin_cmpb function, as represented by the
	P6_OV_BUILTIN_CMPB constant.
	* config/rs6000/rs6000-builtin.def (BU_P6_2): New macro.
	(BU_P6_64BIT_2): New macro.
	(BU_P6_OVERLOAD_2): New macro
	(CMPB_32): Add 32-bit compare-bytes support for 32-bit only targets.
	(CMPB): Add 64-bit compare-bytes support for 32-bit and 64-bit targets.
	(CMPB): Add overload support to represent both 32-bit and 64-bit
	compare-bytes function.
	* config/rs6000/rs6000.c (rs6000_builtin_mask_calculate): Add
	support for TARGET_CMPB.
	* config/rs6000/rs6000.h: Add support for RS6000_BTM_CMPB.
	* doc/extend.texi (PowerPC AltiVec Built-in Functions): Add
	documentation of the __builtin_cmpb overloaded built-in function.

From-SVN: r247907