[PATCH] Extend nops num in "maybe_gen_insn" for RISC-V Vector intrinsics

[juzhe.zhong@rivai.ai]

From: Ju-Zhe Zhong <juzhe.zhong@rivai.ai>

Hi, current maybe_gen_insn can only expand 9 nops.
For RVV intrinsics, I need to extend it as 10, otherwise I should use GEN_FCN.
This patch is quite obvious change, Ok for trunk ?

Thanks.

gcc/ChangeLog:

        * config/riscv/riscv-vector-builtins.cc (function_expander::use_ternop_insn): Use maybe_gen_insn instead.
        (function_expander::use_widen_ternop_insn): Ditto.
        * optabs.cc (maybe_gen_insn): Extend nops handling.

---
 gcc/config/riscv/riscv-vector-builtins.cc | 24 ++---------------------
 gcc/optabs.cc                             |  5 +++++
 2 files changed, 7 insertions(+), 22 deletions(-)

diff --git a/gcc/config/riscv/riscv-vector-builtins.cc b/gcc/config/riscv/riscv-vector-builtins.cc
index 60381cfe98f..fcda3863576 100644
--- a/gcc/config/riscv/riscv-vector-builtins.cc
+++ b/gcc/config/riscv/riscv-vector-builtins.cc
@@ -3154,17 +3154,7 @@ function_expander::use_ternop_insn (bool vd_accum_p, insn_code icode)
   add_input_operand (Pmode, get_tail_policy_for_pred (pred));
   add_input_operand (Pmode, get_mask_policy_for_pred (pred));
   add_input_operand (Pmode, get_avl_type_rtx (avl_type::NONVLMAX));
-
-  /* See optabs.cc, the maximum nops is 9 for using 'maybe_gen_insn'.
-     We temporarily use GCN directly. We will change it back it we
-     can support nops >= 10.  */
-  gcc_assert (maybe_legitimize_operands (icode, 0, opno, m_ops));
-  rtx_insn *pat = GEN_FCN (
-    icode) (m_ops[0].value, m_ops[1].value, m_ops[2].value, m_ops[3].value,
-	    m_ops[4].value, m_ops[5].value, m_ops[6].value, m_ops[7].value,
-	    m_ops[8].value, m_ops[9].value);
-  emit_insn (pat);
-  return m_ops[0].value;
+  return generate_insn (icode);
 }
 
 /* Implement the call using instruction ICODE, with a 1:1 mapping between
@@ -3196,17 +3186,7 @@ function_expander::use_widen_ternop_insn (insn_code icode)
   add_input_operand (Pmode, get_tail_policy_for_pred (pred));
   add_input_operand (Pmode, get_mask_policy_for_pred (pred));
   add_input_operand (Pmode, get_avl_type_rtx (avl_type::NONVLMAX));
-
-  /* See optabs.cc, the maximum nops is 9 for using 'maybe_gen_insn'.
-     We temporarily use GCN directly. We will change it back it we
-     can support nops >= 10.  */
-  gcc_assert (maybe_legitimize_operands (icode, 0, opno, m_ops));
-  rtx_insn *pat = GEN_FCN (
-    icode) (m_ops[0].value, m_ops[1].value, m_ops[2].value, m_ops[3].value,
-	    m_ops[4].value, m_ops[5].value, m_ops[6].value, m_ops[7].value,
-	    m_ops[8].value, m_ops[9].value);
-  emit_insn (pat);
-  return m_ops[0].value;
+  return generate_insn (icode);
 }
 
 /* Implement the call using instruction ICODE, with a 1:1 mapping between
diff --git a/gcc/optabs.cc b/gcc/optabs.cc
index cf22bfec3f5..4c641cab192 100644
--- a/gcc/optabs.cc
+++ b/gcc/optabs.cc
@@ -8091,6 +8091,11 @@ maybe_gen_insn (enum insn_code icode, unsigned int nops,
       return GEN_FCN (icode) (ops[0].value, ops[1].value, ops[2].value,
 			      ops[3].value, ops[4].value, ops[5].value,
 			      ops[6].value, ops[7].value, ops[8].value);
+    case 10:
+      return GEN_FCN (icode) (ops[0].value, ops[1].value, ops[2].value,
+			      ops[3].value, ops[4].value, ops[5].value,
+			      ops[6].value, ops[7].value, ops[8].value,
+			      ops[9].value);
     }
   gcc_unreachable ();
 }
-- 
2.36.1