RISC-V: Implement instruction patterns for ZBB extension.

RISC-V: Implement instruction patterns for ZBB extension.

2021-10-25  Jim Wilson  <jimw@sifive.com>
	    Kito Cheng  <kito.cheng@sifive.com>
	    Jia-Wei Chen  <jiawei@iscas.ac.cn>

gcc/ChangeLog:

	* config/riscv/bitmanip.md (bitmanip_bitwise): New.
	(bitmanip_minmax): New.
	(clz_ctz_pcnt): New.
	(bitmanip_optab): New.
	(bitmanip_insn): New.
	(*<optab>_not<mode>): New.
	(*xor_not<mode>): New.
	(<bitmanip_optab>si2): New.
	(*<bitmanip_optab>disi2): New.
	(<bitmanip_optab>di2): New.
	(*zero_extendhi<GPR:mode>2_bitmanip): New.
	(*extend<SHORT:mode><SUPERQI:mode>2_zbb): New.
	(*zero_extendhi<GPR:mode>2_zbb): New.
	(rotrsi3): New.
	(rotrdi3): New.
	(rotrsi3_sext): New.
	(rotlsi3): New.
	(rotldi3): New.
	(rotlsi3_sext): New.
	(bswap<mode>2): New.
	(<bitmanip_optab><mode>3): New.
	* config/riscv/riscv.md (type): Add rotate.
	(zero_extendhi<GPR:mode>2): Change to define_expand pattern.
	(*zero_extendhi<GPR:mode>2): New.
	(extend<SHORT:mode><SUPERQI:mode>2): Change to define_expand pattern.
	(*extend<SHORT:mode><SUPERQI:mode>2): New.

gcc/testsuite/ChangeLog:

	* gcc.target/riscv/zbb-andn-orn-xnor-01.c: New.
	* gcc.target/riscv/zbb-andn-orn-xnor-02.c: Ditto.
	* gcc.target/riscv/zbb-min-max.c: Ditto.
	* gcc.target/riscv/zbb-rol-ror-01.c: Ditto.
	* gcc.target/riscv/zbb-rol-ror-02.c: Ditto.
	* gcc.target/riscv/zbb-rol-ror-03.c: Ditto.
	* gcc.target/riscv/zbbw.c: Ditto.

Co-authored-by: Kito Cheng <kito.cheng@sifive.com>
Co-authored-by: Jia-Wei Chen <jiawei@iscas.ac.cn>