Freescale Semiconductor PowerPC e500 Core, Reference Manual

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Auxiliary Processing Units (APUs)
PowerPC e500 Core Family Reference Manual, Rev. 1
Freescale Semiconductor 10-17
efdnabs efdnabs
Floating-Point Double-Precision Negative Absolute Value
efdnabs rD,rA
rD
0:63
←
0b1 || rA
1:63
The sign bit of rA is set to 1 and the result is placed into rD.
Exception detection for efdnabs is implementation dependent. On the e500v2, the exception is
handled as follows: If rA is Infinity, Denorm, or NaN, SPEFSCR[FINV] is set, and FG and FX are
cleared. If SPEFSCR[FINVE] = 0, the results are the same as for a normalized number. If
SPEFSCR[FINVE] = 1, an interrupt is taken and rD is not updated.
efdneg efdneg
Floating-Point Double-Precision Negate
efdneg rD,rA
rD
0:63
←
¬
rA
0
|| rA
1:63
The sign bit of rA is complemented and the result is placed into rD.
Exception detection for efdneg is implementation dependent. On the e500v2, the exception is
handled as follows: If rA is Infinity, Denorm, or NaN, SPEFSCR[FINV] is set, and FG and FX are
cleared. If SPEFSCR[FINVE] = 0, the results are the same as for a normalized number. If
SPEFSCR[FINVE] = 1, an interrupt is taken and rD is not updated.
0 5 6 10 11 15 16 20 21 31
0 0 0 1 0 0 r D r A 0 0 0 0 0 0 1 0 1 1 1 0 0 1 0 1
0 5 6 10 11 15 16 20 21 31
0 0 0 1 0 0 r D r A 0 0 0 0 0 0 1 0 1 1 1 0 0 1 1 0