RISC-V: Refactor the or pattern to switch cases

This patch refactor the pattern A or B or C or D, to the switch case for
easy add/remove new types, as well as human reading friendly.

Before this patch:
return A || B || C || D;

After this patch:
switch (type)
  {
    case A:
    case B:
    case C:
    case D:
      return true;
    default:
      return false;
  }

Signed-off-by: Pan Li <pan2.li@intel.com>

gcc/ChangeLog:

	* config/riscv/riscv-vector-builtins.cc (required_extensions_p):
	Refactor the or pattern to switch cases.

1 files changed, 26 insertions, 11 deletions

diff --git a/gcc/config/riscv/riscv-vector-builtins.cc b/gcc/config/riscv/riscv-vector-builtins.cc
index 4117897..0f56f29 100644
--- a/gcc/config/riscv/riscv-vector-builtins.cc
+++ b/gcc/config/riscv/riscv-vector-builtins.cc
@@ -2606,17 +2606,32 @@ register_vector_type (vector_type_index type)
 static bool
 required_extensions_p (enum rvv_base_type type)
 {
-  return type == RVV_BASE_eew8_index || type == RVV_BASE_eew16_index
-	 || type == RVV_BASE_eew32_index || type == RVV_BASE_eew64_index
-	 || type == RVV_BASE_float_vector
-	 || type == RVV_BASE_double_trunc_float_vector
-	 || type == RVV_BASE_double_trunc_vector
-	 || type == RVV_BASE_widen_lmul1_vector
-	 || type == RVV_BASE_eew8_interpret || type == RVV_BASE_eew16_interpret
-	 || type == RVV_BASE_eew32_interpret || type == RVV_BASE_eew64_interpret
-	 || type == RVV_BASE_vlmul_ext_x2 || type == RVV_BASE_vlmul_ext_x4
-	 || type == RVV_BASE_vlmul_ext_x8 || type == RVV_BASE_vlmul_ext_x16
-	 || type == RVV_BASE_vlmul_ext_x32 || type == RVV_BASE_vlmul_ext_x64;
+  switch (type)
+    {
+      case RVV_BASE_eew8_index:
+      case RVV_BASE_eew16_index:
+      case RVV_BASE_eew32_index:
+      case RVV_BASE_eew64_index:
+      case RVV_BASE_float_vector:
+      case RVV_BASE_double_trunc_float_vector:
+      case RVV_BASE_double_trunc_vector:
+      case RVV_BASE_widen_lmul1_vector:
+      case RVV_BASE_eew8_interpret:
+      case RVV_BASE_eew16_interpret:
+      case RVV_BASE_eew32_interpret:
+      case RVV_BASE_eew64_interpret:
+      case RVV_BASE_vlmul_ext_x2:
+      case RVV_BASE_vlmul_ext_x4:
+      case RVV_BASE_vlmul_ext_x8:
+      case RVV_BASE_vlmul_ext_x16:
+      case RVV_BASE_vlmul_ext_x32:
+      case RVV_BASE_vlmul_ext_x64:
+	return true;
+      default:
+	return false;
+    }
+
+  gcc_unreachable ();
 }
 
 static uint64_t