RISC-V: Move RVV POLY VALUE estimation from riscv.cc to riscv-v.cc[NFC]

This patch moves RVV POLY VALUE estimation from riscv.cc to riscv-v.cc for
future better maintain like other target hook implementation.

Committed as it is obviously a code refinement.

gcc/ChangeLog:

	* config/riscv/riscv-protos.h (estimated_poly_value): New function.
	* config/riscv/riscv-v.cc (estimated_poly_value): Ditto.
	* config/riscv/riscv.cc (riscv_estimated_poly_value): Move RVV POLY
	VALUE estimation to riscv-v.cc

3 files changed, 52 insertions, 40 deletions

diff --git a/gcc/config/riscv/riscv-protos.h b/gcc/config/riscv/riscv-protos.h
index 20bbb5b..85ab1db 100644
--- a/gcc/config/riscv/riscv-protos.h
+++ b/gcc/config/riscv/riscv-protos.h
@@ -608,6 +608,7 @@ int count_regno_occurrences (rtx_insn *, unsigned int);
 bool imm_avl_p (machine_mode);
 bool can_be_broadcasted_p (rtx);
 bool gather_scatter_valid_offset_p (machine_mode);
+HOST_WIDE_INT estimated_poly_value (poly_int64, unsigned int);
 }
 
 /* We classify builtin types into two classes:
diff --git a/gcc/config/riscv/riscv-v.cc b/gcc/config/riscv/riscv-v.cc
index 944b37b..01898cb 100644
--- a/gcc/config/riscv/riscv-v.cc
+++ b/gcc/config/riscv/riscv-v.cc
@@ -4927,4 +4927,51 @@ gather_scatter_valid_offset_p (machine_mode mode)
   return true;
 }
 
+/* Implement TARGET_ESTIMATED_POLY_VALUE.
+   Look into the tuning structure for an estimate.
+   KIND specifies the type of requested estimate: min, max or likely.
+   For cores with a known VLA width all three estimates are the same.
+   For generic VLA tuning we want to distinguish the maximum estimate from
+   the minimum and likely ones.
+   The likely estimate is the same as the minimum in that case to give a
+   conservative behavior of auto-vectorizing with VLA when it is a win
+   even for VLA vectorization.
+   When VLA width information is available VAL.coeffs[1] is multiplied by
+   the number of VLA chunks over the initial VLS bits.  */
+HOST_WIDE_INT
+estimated_poly_value (poly_int64 val, unsigned int kind)
+{
+  unsigned int width_source
+    = BITS_PER_RISCV_VECTOR.is_constant ()
+	? (unsigned int) BITS_PER_RISCV_VECTOR.to_constant ()
+	: (unsigned int) RVV_SCALABLE;
+
+  /* If there is no core-specific information then the minimum and likely
+     values are based on TARGET_MIN_VLEN vectors and the maximum is based on
+     the architectural maximum of 65536 bits.  */
+  unsigned int min_vlen_bytes = TARGET_MIN_VLEN / 8 - 1;
+  if (width_source == RVV_SCALABLE)
+    switch (kind)
+      {
+      case POLY_VALUE_MIN:
+      case POLY_VALUE_LIKELY:
+	return val.coeffs[0];
+
+      case POLY_VALUE_MAX:
+	return val.coeffs[0] + val.coeffs[1] * min_vlen_bytes;
+      }
+
+  /* Allow BITS_PER_RISCV_VECTOR to be a bitmask of different VL, treating the
+     lowest as likely.  This could be made more general if future -mtune
+     options need it to be.  */
+  if (kind == POLY_VALUE_MAX)
+    width_source = 1 << floor_log2 (width_source);
+  else
+    width_source = least_bit_hwi (width_source);
+
+  /* If the core provides width information, use that.  */
+  HOST_WIDE_INT over_min_vlen = width_source - TARGET_MIN_VLEN;
+  return val.coeffs[0] + val.coeffs[1] * over_min_vlen / TARGET_MIN_VLEN;
+}
+
 } // namespace riscv_vector
diff --git a/gcc/config/riscv/riscv.cc b/gcc/config/riscv/riscv.cc
index 3f111fa..69a8a50 100644
--- a/gcc/config/riscv/riscv.cc
+++ b/gcc/config/riscv/riscv.cc
@@ -9604,51 +9604,15 @@ riscv_dwarf_poly_indeterminate_value (unsigned int i, unsigned int *factor,
   return RISCV_DWARF_VLENB;
 }
 
-/* Implement TARGET_ESTIMATED_POLY_VALUE.
-   Look into the tuning structure for an estimate.
-   KIND specifies the type of requested estimate: min, max or likely.
-   For cores with a known RVV width all three estimates are the same.
-   For generic RVV tuning we want to distinguish the maximum estimate from
-   the minimum and likely ones.
-   The likely estimate is the same as the minimum in that case to give a
-   conservative behavior of auto-vectorizing with RVV when it is a win
-   even for 128-bit RVV.
-   When RVV width information is available VAL.coeffs[1] is multiplied by
-   the number of VQ chunks over the initial Advanced SIMD 128 bits.  */
+/* Implement TARGET_ESTIMATED_POLY_VALUE.  */
 
 static HOST_WIDE_INT
 riscv_estimated_poly_value (poly_int64 val,
 			    poly_value_estimate_kind kind = POLY_VALUE_LIKELY)
 {
-  unsigned int width_source = BITS_PER_RISCV_VECTOR.is_constant ()
-    ? (unsigned int) BITS_PER_RISCV_VECTOR.to_constant ()
-    : (unsigned int) RVV_SCALABLE;
-
-  /* If there is no core-specific information then the minimum and likely
-     values are based on 128-bit vectors and the maximum is based on
-     the architectural maximum of 65536 bits.  */
-  if (width_source == RVV_SCALABLE)
-    switch (kind)
-      {
-      case POLY_VALUE_MIN:
-      case POLY_VALUE_LIKELY:
-	return val.coeffs[0];
-
-      case POLY_VALUE_MAX:
-	return val.coeffs[0] + val.coeffs[1] * 15;
-      }
-
-  /* Allow BITS_PER_RISCV_VECTOR to be a bitmask of different VL, treating the
-     lowest as likely.  This could be made more general if future -mtune
-     options need it to be.  */
-  if (kind == POLY_VALUE_MAX)
-    width_source = 1 << floor_log2 (width_source);
-  else
-    width_source = least_bit_hwi (width_source);
-
-  /* If the core provides width information, use that.  */
-  HOST_WIDE_INT over_128 = width_source - 128;
-  return val.coeffs[0] + val.coeffs[1] * over_128 / 128;
+  if (TARGET_VECTOR)
+    return riscv_vector::estimated_poly_value (val, kind);
+  return default_estimated_poly_value (val, kind);
 }
 
 /* Return true if the vector misalignment factor is supported by the