Analog Devices ADSP-2106x SHARC User Manual page 572

Shifter
B Compute Operations
Rn = EXP Rx
Syntax:
Rn = EXP Rx
Function:
Extracts the exponent of the fixed-point operand in Rx. The exponent is
placed in the shf8 field in register Rn. The exponent is calculated as the
twos complement of:
# leading sign bits in Rx – 1
Status flags:
SZ Is set if the extracted exponent is 0, otherwise cleared
SV Is cleared
SS Is set if the fixed-point operand in Rx is negative (bit 31 is a 1),
otherwise cleared
B – 70
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