Rev. 1.50, 10/04, page 381 of 448
FDIV Special Cases
FDIV FRn,DRn
FRm,DRm +NORM -NORM +DENORM –DENORM +0 -0 +inf –inf qNaN sNaN
+NORM FDIV +0 -0 +inf -inf
-NORM -0 +0 -inf +inf
+DENORM +0 -0 +inf -inf
–DENORM Error -0 +0 -inf +inf
+0 +inf -inf
-0 DZ invalid -inf DZ+inf
+inf +0 -0 +0 -0 +0 -0
–inf -0 +0 -0 +0 -0 +0 invalid
qNaN qNaN
sNaN invalid
Note: When DN = 1, the value of a denormalized number is treated as 0.
Possible Exceptions and Overflow/Underflow Exception Trap Generating Conditions:
• FPU error
• Invalid operation
• Divide by zero
• Overflow
Generation of overflow-exception traps
FPSCR.PR = 0: (exponent of FRn) − (exponent of FRm) + H'7F is not less than H'FF
FPSCR.PR = 1: (exponent of DRn) − (exponent of DRm) + H'3FF is not less than H'7FF
• Underflow
Generation of underflow-exception traps
FPSCR.PR = 0: (exponent of FRn) − (exponent of FRm) + H'7F is not more than H'01
FPSCR.PR = 1: (exponent of DRn) − (exponent of DRm) + H'3FF is not more than H'001
• Inexact
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