[PATCH 3/5] [ifcvt] optimize x=c ? (y AND z) : y by RISC-V Zicond like insns

[PATCH 3/5] [ifcvt] optimize x=c ? (y AND z) : y by RISC-V Zicond like insns

Take the following case for example.

CFLAGS: -march=rv64gc_zbb_zicond -mabi=lp64d -O2

long
test_AND_ceqz (long x, long y, long z, long c)
{
  if (c)
    x = y & z;
  else
    x = y;
  return x;
}

Before patch:

and	a2,a1,a2
czero.eqz	a0,a2,a3
czero.nez	a3,a1,a3
or	a0,a3,a0
ret

After patch:
and	a0,a1,a2
czero.nez	a1,a1,a3
or	a0,a1,a0
ret

Co-authored-by: Xiao Zeng<zengxiao@eswincomputing.com>
gcc/ChangeLog:

	* ifcvt.cc (noce_cond_zero_binary_op_supported): Add support for AND.
	(noce_bbs_ok_for_cond_zero_arith): Likewise.
	(noce_try_cond_zero_arith): Likewise.

gcc/testsuite/ChangeLog:

	* gcc.target/riscv/zicond_ifcvt_opt.c: Add TCs for AND.