Rev. 1.50, 10/04, page 394 of 448
FMAC FRm
FRn FR0 +NORM -NORM +0 –0 +inf –inf qNaN sNaN
+NORM
-NORM
+0
-0 invalid
+inf
qNaN
-inf
invalid
!sNaN qNaN qNaN
all types sNaN
sNaN all types invalid
Notes: When DN = 1, the value of a denormalized numbers is treated as 0.
When DN = 0, calculation for denormalized numbers is the same as for normalized
numbers.
Possible Exceptions and Overflow/Underflow Exception Trap Generating Conditions:
• FPU error
• Invalid operation
• Overflow
Generation of overflow-exception traps
At least one of following results is not less than H′FD
(exponent of FR0) + (exponent of FRm)
exponent of FRn
• Underflow
Generation of underflow-exception traps
At least one of following results is not more than H′2E
(exponent of FR0) + (exponent of FRm)
exponent of FRn
• Inexact
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