ubsan: ns32k: left shift cannot be represented in type 'int'

* ns32k-dis.c (bit_extract): Use unsigned arithmetic.
	(bit_extract_simple, sign_extend): Likewise.

opcodes/ChangeLog

@@ -1,3 +1,8 @@
+2019-12-11  Alan Modra  <amodra@gmail.com>
+
+	* ns32k-dis.c (bit_extract): Use unsigned arithmetic.
+	(bit_extract_simple, sign_extend): Likewise.
+
 2019-12-11  Alan Modra  <amodra@gmail.com>
 
 	* nios2-dis.c (nios2_print_insn_arg): Use 1u << 31.

opcodes/ns32k-dis.c

@@ -262,8 +262,8 @@ list_search (int reg_value, const struct ns32k_option *optionP, char *result)
 static int
 bit_extract (bfd_byte *buffer, int offset, int count)
 {
-  int result;
-  int bit;
+  unsigned int result;
+  unsigned int bit;
 
   if (offset < 0 || count < 0)
     return 0;
@@ -291,8 +291,8 @@ bit_extract (bfd_byte *buffer, int offset, int count)
 static int
 bit_extract_simple (bfd_byte *buffer, int offset, int count)
 {
-  int result;
-  int bit;
+  unsigned int result;
+  unsigned int bit;
 
   if (offset < 0 || count < 0)
     return 0;
@@ -325,12 +325,10 @@ bit_copy (bfd_byte *buffer, int offset, int count, char *to)
 }
 
 static int
-sign_extend (int value, int bits)
+sign_extend (unsigned int value, unsigned int bits)
 {
-  value = value & ((1 << bits) - 1);
-  return (value & (1 << (bits - 1))
-	  ? value | (~((1 << bits) - 1))
-	  : value);
+  unsigned int sign = 1u << bits;
+  return ((value & (sign - 1)) ^ sign) - sign;
 }
 
 static void