[PATCH V2] RISC-V: Fix incorrect code of reaching inaccessible memory address

[juzhe.zhong@rivai.ai]

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

To fix this issue, we seperate Vl operand and normal operands.

gcc/ChangeLog:

        * config/riscv/autovec.md: Adjust for new interface.
        * config/riscv/riscv-protos.h (emit_vlmax_insn): Add VL operand.
        (emit_nonvlmax_insn): Add AVL operand.
        * config/riscv/riscv-v.cc (emit_vlmax_insn): Add VL operand.
        (emit_nonvlmax_insn): Add AVL operand.
        (sew64_scalar_helper): Adjust for new interface.
        (expand_tuple_move): Ditto.
        * config/riscv/vector.md: Ditto.

---
 gcc/config/riscv/autovec.md     |  4 ++--
 gcc/config/riscv/riscv-protos.h |  4 ++--
 gcc/config/riscv/riscv-v.cc     | 30 +++++++++++++++++++-----------
 gcc/config/riscv/vector.md      |  4 ++--
 4 files changed, 25 insertions(+), 17 deletions(-)

diff --git a/gcc/config/riscv/autovec.md b/gcc/config/riscv/autovec.md
index 04b4459222a..7c87b6012f6 100644
--- a/gcc/config/riscv/autovec.md
+++ b/gcc/config/riscv/autovec.md
@@ -32,7 +32,7 @@
   "TARGET_VECTOR"
 {
   riscv_vector::emit_nonvlmax_insn (code_for_pred_mov (<MODE>mode),
-  				    riscv_vector::RVV_UNOP, operands);
+  				    riscv_vector::RVV_UNOP, operands, operands[2]);
   DONE;
 })
 
@@ -44,7 +44,7 @@
   "TARGET_VECTOR"
 {
   riscv_vector::emit_nonvlmax_insn (code_for_pred_mov (<MODE>mode),
-  				    riscv_vector::RVV_UNOP, operands);
+  				    riscv_vector::RVV_UNOP, operands, operands[2]);
   DONE;
 })
 
diff --git a/gcc/config/riscv/riscv-protos.h b/gcc/config/riscv/riscv-protos.h
index 0ae4656befb..159b51a1210 100644
--- a/gcc/config/riscv/riscv-protos.h
+++ b/gcc/config/riscv/riscv-protos.h
@@ -172,8 +172,8 @@ bool const_vec_all_same_in_range_p (rtx, HOST_WIDE_INT, HOST_WIDE_INT);
 bool legitimize_move (rtx, rtx);
 void emit_vlmax_vsetvl (machine_mode, rtx);
 void emit_hard_vlmax_vsetvl (machine_mode, rtx);
-void emit_vlmax_insn (unsigned, int, rtx *);
-void emit_nonvlmax_insn (unsigned, int, rtx *);
+void emit_vlmax_insn (unsigned, int, rtx *, rtx = 0);
+void emit_nonvlmax_insn (unsigned, int, rtx *, rtx);
 enum vlmul_type get_vlmul (machine_mode);
 unsigned int get_ratio (machine_mode);
 unsigned int get_nf (machine_mode);
diff --git a/gcc/config/riscv/riscv-v.cc b/gcc/config/riscv/riscv-v.cc
index fa61a850a22..1cdc4a99701 100644
--- a/gcc/config/riscv/riscv-v.cc
+++ b/gcc/config/riscv/riscv-v.cc
@@ -71,7 +71,8 @@ public:
       m_fully_unmasked_p (false), m_use_real_merge_p (false),
       m_needs_avl_p (false), m_vlmax_p (false), m_has_tail_policy_p (false),
       m_has_mask_policy_p (false), m_tail_policy (TAIL_ANY),
-      m_mask_policy (MASK_ANY), m_dest_mode (VOIDmode), m_mask_mode (VOIDmode)
+      m_mask_policy (MASK_ANY), m_dest_mode (VOIDmode), m_mask_mode (VOIDmode),
+      m_vl_op (NULL_RTX)
   {}
 
   /* Initializer for various configurations.  */
@@ -83,7 +84,8 @@ public:
       m_use_real_merge_p (use_real_merge_p), m_needs_avl_p (needs_avl_p),
       m_vlmax_p (vlmax_p), m_has_tail_policy_p (false),
       m_has_mask_policy_p (false), m_tail_policy (TAIL_ANY),
-      m_mask_policy (MASK_ANY), m_dest_mode (dest_mode), m_mask_mode (mask_mode)
+      m_mask_policy (MASK_ANY), m_dest_mode (dest_mode),
+      m_mask_mode (mask_mode), m_vl_op (NULL_RTX)
   {}
 
   void set_policy (enum tail_policy ta)
@@ -96,6 +98,7 @@ public:
     m_has_mask_policy_p = true;
     m_mask_policy = ma;
   }
+  void set_vl (rtx vl) { m_vl_op = vl; }
 
   void add_output_operand (rtx x, machine_mode mode)
   {
@@ -169,7 +172,7 @@ public:
 
     if (m_needs_avl_p)
       {
-	rtx len = ops[m_op_num];
+	rtx len = m_vl_op;
 	if (m_vlmax_p)
 	  {
 	    if (const_vlmax_p (m_dest_mode))
@@ -228,6 +231,7 @@ private:
   enum mask_policy m_mask_policy;
   machine_mode m_dest_mode;
   machine_mode m_mask_mode;
+  rtx m_vl_op;
   expand_operand m_ops[MAX_OPERANDS];
 };
 
@@ -339,7 +343,7 @@ autovec_use_vlmax_p (void)
 /* This function emits a {VLMAX, TAIL_ANY, MASK_ANY} vsetvli followed by the
  * actual operation.  */
 void
-emit_vlmax_insn (unsigned icode, int op_num, rtx *ops)
+emit_vlmax_insn (unsigned icode, int op_num, rtx *ops, rtx vl)
 {
   machine_mode data_mode = GET_MODE (ops[0]);
   machine_mode mask_mode = get_mask_mode (data_mode).require ();
@@ -352,13 +356,16 @@ emit_vlmax_insn (unsigned icode, int op_num, rtx *ops)
 		       /*DEST_MODE*/ data_mode, /*MASK_MODE*/ mask_mode);
   e.set_policy (TAIL_ANY);
   e.set_policy (MASK_ANY);
+  /* According to LRA mov pattern in vector.md, we have a clobber operand
+     to be used ad VL operand.  */
+  e.set_vl (vl);
   e.emit_insn ((enum insn_code) icode, ops);
 }
 
 /* This function emits a {NONVLMAX, TAIL_ANY, MASK_ANY} vsetvli followed by the
  * actual operation.  */
 void
-emit_nonvlmax_insn (unsigned icode, int op_num, rtx *ops)
+emit_nonvlmax_insn (unsigned icode, int op_num, rtx *ops, rtx avl)
 {
   machine_mode data_mode = GET_MODE (ops[0]);
   machine_mode mask_mode = get_mask_mode (data_mode).require ();
@@ -371,6 +378,7 @@ emit_nonvlmax_insn (unsigned icode, int op_num, rtx *ops)
 		       /*DEST_MODE*/ data_mode, /*MASK_MODE*/ mask_mode);
   e.set_policy (TAIL_ANY);
   e.set_policy (MASK_ANY);
+  e.set_vl (avl);
   e.emit_insn ((enum insn_code) icode, ops);
 }
 
@@ -810,9 +818,9 @@ sew64_scalar_helper (rtx *operands, rtx *scalar_op, rtx vl,
     *scalar_op = force_reg (scalar_mode, *scalar_op);
 
   rtx tmp = gen_reg_rtx (vector_mode);
-  rtx ops[] = {tmp, *scalar_op, vl};
+  rtx ops[] = {tmp, *scalar_op};
   riscv_vector::emit_nonvlmax_insn (code_for_pred_broadcast (vector_mode),
-					 riscv_vector::RVV_UNOP, ops);
+				    riscv_vector::RVV_UNOP, ops, vl);
   emit_vector_func (operands, tmp);
 
   return true;
@@ -1119,9 +1127,9 @@ expand_tuple_move (rtx *ops)
 
 	      if (fractional_p)
 		{
-		  rtx operands[] = {subreg, mem, ops[4]};
+		  rtx operands[] = {subreg, mem};
 		  emit_vlmax_insn (code_for_pred_mov (subpart_mode), RVV_UNOP,
-				   operands);
+				   operands, ops[4]);
 		}
 	      else
 		emit_move_insn (subreg, mem);
@@ -1144,9 +1152,9 @@ expand_tuple_move (rtx *ops)
 
 	      if (fractional_p)
 		{
-		  rtx operands[] = {mem, subreg, ops[4]};
+		  rtx operands[] = {mem, subreg};
 		  emit_vlmax_insn (code_for_pred_mov (subpart_mode), RVV_UNOP,
-				   operands);
+				   operands, ops[4]);
 		}
 	      else
 		emit_move_insn (mem, subreg);
diff --git a/gcc/config/riscv/vector.md b/gcc/config/riscv/vector.md
index 13b94862693..9afef0d12bc 100644
--- a/gcc/config/riscv/vector.md
+++ b/gcc/config/riscv/vector.md
@@ -761,7 +761,7 @@
     {
       riscv_vector::emit_vlmax_vsetvl (<V_FRACT:MODE>mode, operands[2]);
       riscv_vector::emit_vlmax_insn (code_for_pred_mov (<V_FRACT:MODE>mode),
-				     riscv_vector::RVV_UNOP, operands);
+				     riscv_vector::RVV_UNOP, operands, operands[2]);
     }
   DONE;
 })
@@ -781,7 +781,7 @@
     {
       riscv_vector::emit_vlmax_vsetvl (<VB:MODE>mode, operands[2]);
       riscv_vector::emit_vlmax_insn (code_for_pred_mov (<VB:MODE>mode),
-				     riscv_vector::RVV_UNOP, operands);
+				     riscv_vector::RVV_UNOP, operands, operands[2]);
     }
   DONE;
 })
-- 
2.36.3