Non-Numbers (Nan); Table 6.2 Floating-Point Ranges - Hitachi SH7750 Hardware Manual

Table 6.2 Floating-Point Ranges
Type
Signaling non-number
Quiet non-number
Positive infinity
Positive normalized
number
Positive denormalized
number
Positive zero
Negative zero
Negative denormalized
number
Negative normalized
number
Negative infinity
Quiet non-number
Signaling non-number
6.2.2

Non-Numbers (NaN)

Figure 6.3 shows the bit pattern of a non-number (NaN). A value is NaN in the following case:
• Sign bit: Don't care
• Exponent field: All bits are 1
• Fraction field: At least one bit is 1
The NaN is a signaling NaN (sNaN) if the MSB of the fraction field is 1, and a quiet NaN (qNaN)
if the MSB is 0.
Single-Precision
H'7FFFFFFF to H'7FC00000
H'7FBFFFFF to H'7F800001
H'7F800000
H'7F7FFFFF to H'00800000
H'007FFFFF to H'00000001
H'00000000
H'80000000
H'80000001 to H'807FFFFF
H'80800000 to H'FF7FFFFF
H'FF800000
H'FF800001 to H'FFBFFFFF
H'FFC00000 to H'FFFFFFFF
Double-Precision
H'7FFFFFFF FFFFFFFF to
H'7FF80000 00000000
H'7FF7FFFF FFFFFFFF to
H'7FF00000 00000001
H'7FF00000 00000
H'7FEFFFFF FFFFFFFF to
H'00100000 00000000
H'000FFFFF FFFFFFFF to
H'00000000 00000001
H'00000000 00000000
H'80000000 00000000
H'80000000 00000001 to
H'800FFFFF FFFFFFFF
H'80100000 00000000 to
H'FFEFFFFF FFFFFFFF
H'FFF00000 00000000
H'FFF00000 00000001 to
H'FFF7FFFF FFFFFFFF
H'FFF80000 00000000 to
H'FFFFFFFF FFFFFFFF
Rev. 6.0, 07/02, page 163 of 986