FUJITSU Implementation Supplement Fujitsu SPARC64 V - Manual (Page 75)

64 SPARC JPS1 Implementation Supplement: Fujitsu SPARC64 V • Release 1.0, 1 July 2002
Pessimistic Zero
If a condition in TABLE B-3 is true , SPARC64 V generates the result as a pessimistic
zero, meaning that the result is a denormalized minimum or a zero, depending on
the rounding mode (
FSR.RD ).
FMULs , FMULd 1. One of the operands is a denormalized number, the other operand is a normal,
nonzero floating-point number (except for a NaN and an infinity), and
single precision: -25 < Er
double precision: -54 < Er
2. Both operands are normal, nonzero floating-point numbers (except for a NaN and
an infinity), TEM.UFM = 0, and
single precision: − 25 < eres < 1
double precision:
−
54 < eres < 1
FsMULd 1. One of the operands is a denormalized number, and the other operand is a normal,
nonzero floating-point number (except for a NaN and an infinity).
2. Both operands are denormalized numbers.
FDIVs , FDIVd 1. The dividend (operand1; rs1 ) is a normal, nonzero floating-point number (except
for a NaN and an infinity), the divisor (operand2; rs2) is a denormalized number,
and
single precision: Er < 255
double precision: Er < 2047
2. The dividend (operand1; rs1 ) is a denormalized number, the divisor (operand2;
rs2) is a normal, nonzero floating-point number (except for a NaN and an infinity),
and
single precision:
−
25 < Er
double precision:
−
54 < Er
3. Both operands are denormalized numbers.
4. Both operands are normal, nonzero floating-point numbers (except for a NaN and
an infinity), TEM.UFM = 0 and
single precision: − 25 < eres < 1
double precision:
−
54 < eres < 1
FSQRTs , FSQRTd The input operand (operand2; rs2) is a positive nonzero and is a denormalized
number.
1. Operation of 0 and denormalized number generates a result in accordance with the IEEE754-1985 standard.
TABLE B-2 unfinished_FPop Boundary Conditions (Continued)
Operation Boundary Conditions