+ floatformat_intbit_yes,
+ "floatformat_arm_ext_big",
+ floatformat_always_valid,
+ NULL
+};
+const struct floatformat floatformat_arm_ext_littlebyte_bigword =
+{
+ /* Bits 1 to 16 are unused. */
+ floatformat_littlebyte_bigword, 96, 0, 17, 15, 0x3fff, 0x7fff, 32, 64,
+ floatformat_intbit_yes,
+ "floatformat_arm_ext_littlebyte_bigword",
+ floatformat_always_valid,
+ NULL
+};
+const struct floatformat floatformat_ia64_spill_big =
+{
+ floatformat_big, 128, 0, 1, 17, 65535, 0x1ffff, 18, 64,
+ floatformat_intbit_yes,
+ "floatformat_ia64_spill_big",
+ floatformat_always_valid,
+ NULL
+};
+const struct floatformat floatformat_ia64_spill_little =
+{
+ floatformat_little, 128, 0, 1, 17, 65535, 0x1ffff, 18, 64,
+ floatformat_intbit_yes,
+ "floatformat_ia64_spill_little",
+ floatformat_always_valid,
+ NULL
+};
+const struct floatformat floatformat_ia64_quad_big =
+{
+ floatformat_big, 128, 0, 1, 15, 16383, 0x7fff, 16, 112,
+ floatformat_intbit_no,
+ "floatformat_ia64_quad_big",
+ floatformat_always_valid,
+ NULL
+};
+const struct floatformat floatformat_ia64_quad_little =
+{
+ floatformat_little, 128, 0, 1, 15, 16383, 0x7fff, 16, 112,
+ floatformat_intbit_no,
+ "floatformat_ia64_quad_little",
+ floatformat_always_valid,
+ NULL
+};
+
+static int
+floatformat_ibm_long_double_is_valid (const struct floatformat *fmt,
+ const void *from)
+{
+ const unsigned char *ufrom = (const unsigned char *) from;
+ const struct floatformat *hfmt = fmt->split_half;
+ long top_exp, bot_exp;
+ int top_nan = 0;
+
+ top_exp = get_field (ufrom, hfmt->byteorder, hfmt->totalsize,
+ hfmt->exp_start, hfmt->exp_len);
+ bot_exp = get_field (ufrom + 8, hfmt->byteorder, hfmt->totalsize,
+ hfmt->exp_start, hfmt->exp_len);
+
+ if ((unsigned long) top_exp == hfmt->exp_nan)
+ top_nan = mant_bits_set (hfmt, ufrom);
+
+ /* A NaN is valid with any low part. */
+ if (top_nan)
+ return 1;
+
+ /* An infinity, zero or denormal requires low part 0 (positive or
+ negative). */
+ if ((unsigned long) top_exp == hfmt->exp_nan || top_exp == 0)
+ {
+ if (bot_exp != 0)
+ return 0;
+
+ return !mant_bits_set (hfmt, ufrom + 8);
+ }
+
+ /* The top part is now a finite normal value. The long double value
+ is the sum of the two parts, and the top part must equal the
+ result of rounding the long double value to nearest double. Thus
+ the bottom part must be <= 0.5ulp of the top part in absolute
+ value, and if it is < 0.5ulp then the long double is definitely
+ valid. */
+ if (bot_exp < top_exp - 53)
+ return 1;
+ if (bot_exp > top_exp - 53 && bot_exp != 0)
+ return 0;
+ if (bot_exp == 0)
+ {
+ /* The bottom part is 0 or denormal. Determine which, and if
+ denormal the first two set bits. */
+ int first_bit = -1, second_bit = -1, cur_bit;
+ for (cur_bit = 0; (unsigned int) cur_bit < hfmt->man_len; cur_bit++)
+ if (get_field (ufrom + 8, hfmt->byteorder, hfmt->totalsize,
+ hfmt->man_start + cur_bit, 1))
+ {
+ if (first_bit == -1)
+ first_bit = cur_bit;
+ else
+ {
+ second_bit = cur_bit;
+ break;
+ }
+ }
+ /* Bottom part 0 is OK. */
+ if (first_bit == -1)
+ return 1;
+ /* The real exponent of the bottom part is -first_bit. */
+ if (-first_bit < top_exp - 53)
+ return 1;
+ if (-first_bit > top_exp - 53)
+ return 0;
+ /* The bottom part is at least 0.5ulp of the top part. For this
+ to be OK, the bottom part must be exactly 0.5ulp (i.e. no
+ more bits set) and the top part must have last bit 0. */
+ if (second_bit != -1)
+ return 0;
+ return !get_field (ufrom, hfmt->byteorder, hfmt->totalsize,
+ hfmt->man_start + hfmt->man_len - 1, 1);
+ }
+ else
+ {
+ /* The bottom part is at least 0.5ulp of the top part. For this
+ to be OK, it must be exactly 0.5ulp (i.e. no explicit bits
+ set) and the top part must have last bit 0. */
+ if (get_field (ufrom, hfmt->byteorder, hfmt->totalsize,
+ hfmt->man_start + hfmt->man_len - 1, 1))
+ return 0;
+ return !mant_bits_set (hfmt, ufrom + 8);
+ }
+}
+
+const struct floatformat floatformat_ibm_long_double =
+{
+ floatformat_big, 128, 0, 1, 11, 1023, 2047, 12, 52,
+ floatformat_intbit_no,
+ "floatformat_ibm_long_double",
+ floatformat_ibm_long_double_is_valid,
+ &floatformat_ieee_double_big