Add bcd builtings listed in appendix B of the ABI

Add bcd builtings listed in appendix B of the ABI

2020-10-29  Carl Love  <cel@us.ibm.com>

gcc/
	PR target/93449
	* config/rs6000/altivec.h (__builtin_bcdadd, __builtin_bcdadd_lt,
	__builtin_bcdadd_eq, __builtin_bcdadd_gt, __builtin_bcdadd_ofl,
	__builtin_bcdadd_ov, __builtin_bcdsub, __builtin_bcdsub_lt,
	__builtin_bcdsub_eq, __builtin_bcdsub_gt, __builtin_bcdsub_ofl,
	__builtin_bcdsub_ov, __builtin_bcdinvalid, __builtin_bcdmul10,
	__builtin_bcddiv10, __builtin_bcd2dfp, __builtin_bcdcmpeq,
	__builtin_bcdcmpgt, __builtin_bcdcmplt, __builtin_bcdcmpge,
	__builtin_bcdcmple): Add defines.
	* config/rs6000/altivec.md: Add UNSPEC_BCDSHIFT.
	(BCD_TEST): Add le, ge to code iterator.
	Add VBCD mode iterator.
	(bcd<bcd_add_sub>_test, *bcd<bcd_add_sub>_test2,
	bcd<bcd_add_sub>_<code>, bcd<bcd_add_sub>_<code>): Add mode to name.
	Change iterator from V1TI to VBCD.
	(*bcdinvalid_<mode>, bcdshift_v16qi): New define_insn.
	(bcdinvalid_<mode>, bcdmul10_v16qi, bcddiv10_v16qi): New define.
	* config/rs6000/dfp.md (dfp_denbcd_v16qi_inst): New define_insn.
	(dfp_denbcd_v16qi): New define_expand.
	* config/rs6000/rs6000-builtin.def (BU_P8V_MISC_1): New define.
	(BCDADD): Replaced with BCDADD_V1TI and BCDADD_V16QI.
	(BCDADD_LT): Replaced with BCDADD_LT_V1TI and BCDADD_LT_V16QI.
	(BCDADD_EQ): Replaced with BCDADD_EQ_V1TI and BCDADD_EQ_V16QI.
	(BCDADD_GT): Replaced with BCDADD_GT_V1TI and BCDADD_GT_V16QI.
	(BCDADD_OV): Replaced with BCDADD_OV_V1TI and BCDADD_OV_V16QI.
	(BCDSUB_V1TI, BCDSUB_V16QI, BCDSUB_LT_V1TI, BCDSUB_LT_V16QI,
	BCDSUB_LE_V1TI, BCDSUB_LE_V16QI, BCDSUB_EQ_V1TI, BCDSUB_EQ_V16QI,
	BCDSUB_GT_V1TI, BCDSUB_GT_V16QI, BCDSUB_GE_V1TI, BCDSUB_GE_V16QI,
	BCDSUB_OV_V1TI, BCDSUB_OV_V16QI, BCDINVALID_V1TI, BCDINVALID_V16QI,
	BCDMUL10_V16QI, BCDDIV10_V16QI, DENBCD_V16QI): New builtin definitions.
	(BCDADD, BCDADD_LT, BCDADD_EQ, BCDADD_GT, BCDADD_OV, BCDSUB, BCDSUB_LT,
	BCDSUB_LE, BCDSUB_EQ, BCDSUB_GT, BCDSUB_GE, BCDSUB_OV, BCDINVALID,
	BCDMUL10, BCDDIV10, DENBCD): New overload definitions.
	* config/rs6000/rs6000-call.c (P8V_BUILTIN_VEC_BCDADD, P8V_BUILTIN_VEC_BCDADD_LT,
	P8V_BUILTIN_VEC_BCDADD_EQ, P8V_BUILTIN_VEC_BCDADD_GT, P8V_BUILTIN_VEC_BCDADD_OV,
	P8V_BUILTIN_VEC_BCDINVALID, P9V_BUILTIN_VEC_BCDMUL10, P8V_BUILTIN_VEC_DENBCD.
	P8V_BUILTIN_VEC_BCDSUB, P8V_BUILTIN_VEC_BCDSUB_LT, P8V_BUILTIN_VEC_BCDSUB_LE,
	P8V_BUILTIN_VEC_BCDSUB_EQ, P8V_BUILTIN_VEC_BCDSUB_GT, P8V_BUILTIN_VEC_BCDSUB_GE,
	P8V_BUILTIN_VEC_BCDSUB_OV): New overloaded specifications.
	(CODE_FOR_bcdadd): Replaced with CODE_FOR_bcdadd_v16qi and CODE_FOR_bcdadd_v1ti.
	(CODE_FOR_bcdadd_lt): Replaced with CODE_FOR_bcdadd_lt_v16qi and CODE_FOR_bcdadd_lt_v1ti.
	(CODE_FOR_bcdadd_eq): Replaced with CODE_FOR_bcdadd_eq_v16qi and CODE_FOR_bcdadd_eq_v1ti.
	(CODE_FOR_bcdadd_gt): Replaced with CODE_FOR_bcdadd_gt_v16qi and CODE_FOR_bcdadd_gt_v1ti.
	(CODE_FOR_bcdsub): Replaced with CODE_FOR_bcdsub_v16qi and CODE_FOR_bcdsub_v1ti.
	(CODE_FOR_bcdsub_lt): Replaced with CODE_FOR_bcdsub_lt_v16qi and CODE_FOR_bcdsub_lt_v1ti.
	(CODE_FOR_bcdsub_eq): Replaced with CODE_FOR_bcdsub_eq_v16qi and CODE_FOR_bcdsub_eq_v1ti.
	(CODE_FOR_bcdsub_gt): Replaced with CODE_FOR_bcdsub_gt_v16qi and CODE_FOR_bcdsub_gt_v1ti.
	(rs6000_expand_ternop_builtin):  Add CODE_FOR_dfp_denbcd_v16qi to else if.
	* doc/extend.texi: Add documentation for new builtins.

gcc/testsuite/
	* gcc.target/powerpc/bcd-2.c: Add include altivec.h.
	* gcc.target/powerpc/bcd-3.c: Add include altivec.h.
	* gcc.target/powerpc/bcd-4.c: New test.