(extract_fixed_bit_field): For REG case, compute total_bits from mode

instead of assuming BITS_PER_WORD.

From-SVN: r9865

gcc/expmed.c

@@ -1362,7 +1362,7 @@ extract_fixed_bit_field (tmode, op0, offset, bitsize, bitpos,
      int unsignedp;
      int align;
 {
-  int total_bits = BITS_PER_WORD;
+  int total_bits;
   enum machine_mode mode;
 
   if (GET_CODE (op0) == SUBREG || GET_CODE (op0) == REG)
@@ -1371,6 +1371,9 @@ extract_fixed_bit_field (tmode, op0, offset, bitsize, bitpos,
       if (bitsize + bitpos > BITS_PER_WORD)
 	return extract_split_bit_field (op0, bitsize, bitpos,
 					unsignedp, align);
+
+      mode = GET_MODE (op0);
+      total_bits = GET_MODE_BITSIZE (mode);
     }
   else
     {
@@ -1411,8 +1414,6 @@ extract_fixed_bit_field (tmode, op0, offset, bitsize, bitpos,
 			    plus_constant (XEXP (op0, 0), offset));
     }
 
-  mode = GET_MODE (op0);
-
   if (BYTES_BIG_ENDIAN)
     {
       /* BITPOS is the distance between our msb and that of OP0.