[gcc r13-5669] RISC-V: Add RVV shift.vx C/C++ API support

[gcc r13-5669] RISC-V: Add RVV shift.vx C/C++ API support

[Kito Cheng]

https://gcc.gnu.org/g:61122017132366189b43bc15402c34d5d9615024

commit r13-5669-g61122017132366189b43bc15402c34d5d9615024
Author: Ju-Zhe Zhong <juzhe.zhong@rivai.ai>
Date:   Wed Feb 1 06:07:24 2023 +0800

    RISC-V: Add RVV shift.vx C/C++ API support
    
    gcc/ChangeLog:
    
            * config/riscv/predicates.md (pmode_reg_or_uimm5_operand): New predicate.
            * config/riscv/riscv-vector-builtins-bases.cc: New class.
            * config/riscv/riscv-vector-builtins-functions.def (vsll): Ditto.
            (vsra): Ditto.
            (vsrl): Ditto.
            * config/riscv/riscv-vector-builtins.cc: Ditto.
            * config/riscv/vector.md (@pred_<optab><mode>_scalar): New pattern.

Diff:
---
 gcc/config/riscv/predicates.md                     |  8 +++++++
 gcc/config/riscv/riscv-vector-builtins-bases.cc    | 10 ++++++++-
 .../riscv/riscv-vector-builtins-functions.def      |  3 +++
 gcc/config/riscv/riscv-vector-builtins.cc          | 13 +++++++++++
 gcc/config/riscv/vector.md                         | 26 ++++++++++++++++++++++
 5 files changed, 59 insertions(+), 1 deletion(-)

diff --git a/gcc/config/riscv/predicates.md b/gcc/config/riscv/predicates.md
index 57f7ddfbd7d..895831443e1 100644
--- a/gcc/config/riscv/predicates.md
+++ b/gcc/config/riscv/predicates.md
@@ -301,6 +301,14 @@
        (and (match_code "const_vector")
             (match_test "riscv_vector::const_vec_all_same_in_range_p (op, 0, 31)"))))
 
+;; pmode_reg_or_uimm5_operand can be used by vsll.vx/vsrl.vx/vsra.vx instructions.
+;; Since it has the same predicate with vector_length_operand which allows register
+;; or immediate (0 ~ 31), we define this predicate same as vector_length_operand here.
+;; We don't use vector_length_operand directly to predicate vsll.vx/vsrl.vx/vsra.vx
+;; since it may be confusing.
+(define_special_predicate "pmode_reg_or_uimm5_operand"
+  (match_operand 0 "vector_length_operand"))
+
 (define_special_predicate "pmode_reg_or_0_operand"
   (ior (match_operand 0 "const_0_operand")
        (match_operand 0 "pmode_register_operand")))
diff --git a/gcc/config/riscv/riscv-vector-builtins-bases.cc b/gcc/config/riscv/riscv-vector-builtins-bases.cc
index f4256fedc5b..00d357a0d36 100644
--- a/gcc/config/riscv/riscv-vector-builtins-bases.cc
+++ b/gcc/config/riscv/riscv-vector-builtins-bases.cc
@@ -163,7 +163,15 @@ class binop : public function_base
 public:
   rtx expand (function_expander &e) const override
   {
-    return e.use_exact_insn (code_for_pred (CODE, e.vector_mode ()));
+    switch (e.op_info->op)
+      {
+      case OP_TYPE_vx:
+	return e.use_exact_insn (code_for_pred_scalar (CODE, e.vector_mode ()));
+      case OP_TYPE_vv:
+	return e.use_exact_insn (code_for_pred (CODE, e.vector_mode ()));
+      default:
+	gcc_unreachable ();
+      }
   }
 };
 
diff --git a/gcc/config/riscv/riscv-vector-builtins-functions.def b/gcc/config/riscv/riscv-vector-builtins-functions.def
index 9f9678ab6dd..b543946c72e 100644
--- a/gcc/config/riscv/riscv-vector-builtins-functions.def
+++ b/gcc/config/riscv/riscv-vector-builtins-functions.def
@@ -80,5 +80,8 @@ DEF_RVV_FUNCTION (vdiv, binop, full_preds, iu_vvv_ops)
 DEF_RVV_FUNCTION (vrem, binop, full_preds, iu_vvv_ops)
 DEF_RVV_FUNCTION (vdivu, binop, full_preds, iu_vvv_ops)
 DEF_RVV_FUNCTION (vremu, binop, full_preds, iu_vvv_ops)
+DEF_RVV_FUNCTION (vsll, binop, full_preds, iu_shift_vvx_ops)
+DEF_RVV_FUNCTION (vsra, binop, full_preds, iu_shift_vvx_ops)
+DEF_RVV_FUNCTION (vsrl, binop, full_preds, iu_shift_vvx_ops)
 
 #undef DEF_RVV_FUNCTION
diff --git a/gcc/config/riscv/riscv-vector-builtins.cc b/gcc/config/riscv/riscv-vector-builtins.cc
index 3a6c2c7c6f2..12fea2b3594 100644
--- a/gcc/config/riscv/riscv-vector-builtins.cc
+++ b/gcc/config/riscv/riscv-vector-builtins.cc
@@ -249,6 +249,11 @@ static CONSTEXPR const rvv_arg_type_info shift_vv_args[]
   = {rvv_arg_type_info (RVV_BASE_vector),
      rvv_arg_type_info (RVV_BASE_shift_vector), rvv_arg_type_info_end};
 
+/* A list of args for vector_type func (vector_type, size) function.  */
+static CONSTEXPR const rvv_arg_type_info vector_size_args[]
+  = {rvv_arg_type_info (RVV_BASE_vector), rvv_arg_type_info (RVV_BASE_size),
+     rvv_arg_type_info_end};
+
 /* A list of none preds that will be registered for intrinsic functions.  */
 static CONSTEXPR const predication_type_index none_preds[]
   = {PRED_TYPE_none, NUM_PRED_TYPES};
@@ -405,6 +410,14 @@ static CONSTEXPR const rvv_op_info iu_shift_vvv_ops
      rvv_arg_type_info (RVV_BASE_vector), /* Return type */
      shift_vv_args /* Args */};
 
+/* A static operand information for vector_type func (vector_type, size_t)
+ * function registration. */
+static CONSTEXPR const rvv_op_info iu_shift_vvx_ops
+  = {iu_ops,				  /* Types */
+     OP_TYPE_vx,			  /* Suffix */
+     rvv_arg_type_info (RVV_BASE_vector), /* Return type */
+     vector_size_args /* Args */};
+
 /* A list of all RVV intrinsic functions.  */
 static function_group_info function_groups[] = {
 #define DEF_RVV_FUNCTION(NAME, SHAPE, PREDS, OPS_INFO)                         \
diff --git a/gcc/config/riscv/vector.md b/gcc/config/riscv/vector.md
index e8d75f164e3..36b0e07728c 100644
--- a/gcc/config/riscv/vector.md
+++ b/gcc/config/riscv/vector.md
@@ -1148,3 +1148,29 @@
    v<binop_alt2_insn>\t%0,<binop_alt2_op>%p1"
   [(set_attr "type" "<int_binop_insn_type>")
    (set_attr "mode" "<MODE>")])
+
+;; vx instructions patterns.
+;; Note: Unlike vv patterns, we should split them since they are variant.
+;; For vsll.vx/vsra.vx/vsrl.vx the scalar mode should be Pmode wheras the
+;; scalar mode is inner mode of the RVV mode for other vx patterns.
+(define_insn "@pred_<optab><mode>_scalar"
+  [(set (match_operand:VI 0 "register_operand"             "=vr,   vr")
+	(if_then_else:VI
+	  (unspec:<VM>
+	    [(match_operand:<VM> 1 "vector_mask_operand" "vmWc1,vmWc1")
+	     (match_operand 5 "vector_length_operand"    "   rK,   rK")
+	     (match_operand 6 "const_int_operand"        "    i,    i")
+	     (match_operand 7 "const_int_operand"        "    i,    i")
+	     (match_operand 8 "const_int_operand"        "    i,    i")
+	     (reg:SI VL_REGNUM)
+	     (reg:SI VTYPE_REGNUM)] UNSPEC_VPREDICATE)
+	  (any_shift:VI
+	    (match_operand:VI 3 "register_operand"         " vr,   vr")
+	    (match_operand 4 "pmode_reg_or_uimm5_operand"  "  r,    K"))
+	  (match_operand:VI 2 "vector_merge_operand"       "0vu,  0vu")))]
+  "TARGET_VECTOR"
+  "@
+   v<insn>.vx\t%0,%3,%4%p1
+   v<insn>.vi\t%0,%3,%4%p1"
+  [(set_attr "type" "vshift")
+   (set_attr "mode" "<MODE>")])