Rev. 1.50, 10/04, page 404 of 448
FMUL Special Cases (FPSCR.PR = 1)
FMUL DRn
DRm +NORM -NORM +DENORM –DENORM +0 -0 +inf –inf qNaN sNaN
+NORM FMUL
+0 -0 +inf -inf
-NORM -0 +0 -inf +inf
+DENORM +0 -0 +inf -inf
–DENORM Error -0 +0 -inf +inf
+0 +0 -0 +0 -0 +0 -0
-0 -0 +0 -0 +0 -0 +0 invalid
+inf +inf -inf +inf -inf +inf -inf
–inf -inf +inf -inf +inf invalid -inf +inf
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
• Overflow
Generation of overflow-exception traps
FPSCR.PR = 0: (exponent of FRn) + (exponent of FRm) − H'7F is not less than H'FE
FPSCR.PR = 1: (exponent of DRn) + (exponent of DRm) − H'3FF is not less than H'7FE
• Underflow
Generation of underflow-exception traps
FPSCR.PR = 0:
When both FRn and FRm are normalized numbers: (exponent of FRn) + (exponent of FRm) −
H'7F is not more than H'00
When at least FRn or FRm is not a normalized number: (exponent of FRn) + (exponent of
FRm) − H'7F is not more than H'18
FPSCR.PR = 1: (exponent of DRn) + (exponent of DRm) − H'3FF is not more than H'000
• Inexact
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