Xilinx Virtex-II Pro PPC405, Руководство пользователя

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March 2002 Release www.xilinx.com 397
Virtex-II Pro™ Platform FPGA Documentation 1-800-255-7778
Integer Instructions
R
XOR and Equivalence Instructions
Table 3-31 shows the PowerPC XOR and equivalence (XNOR) instructions. For each type of
instruction shown, the “Operation” column indicates the Boolean operation performed.
The column also shows, on an instruction-by-instruction basis, whether the CR0 field is
updated.
Sign-Extension Instructions
Table 3-32 shows the sign-extension instructions. These instructions sign-extend the value
in the r S register and write the result in the r A register. For each type of instruction shown,
the “Operation” column indicates the operation performed. The column also shows, on an
instruction-by-instruction basis, whether the CR0 field is updated.
OR Immediate-Shifted Instructions
r A is loaded with the logical result ( r S) OR (UIMM
||
0x0000)
oris OR Immediate Shifted
CR0 is
not
updated.
r A, r S,UIMM
OR with Complement Instructions
r A is loaded with the logical result ( r S) OR
¬
( r B).
orc OR with Complement
CR0 is
not
updated.
r A, r S, r B
orc. OR with Complement and Record
CR0 is updated to reflect the result.
Table 3-30: OR and NOR Instructions (Continued)
Mnemonic Name Operation
Operand
Syntax
Table 3-31:
XOR and Equivalence Instructions
Mnemonic Name Operation
Operand
Syntax
Equivalence Instructions
r A is loaded with the logical result
¬
(( r S) XOR ( r B)).
eqv Equivalent
CR0 is
not
updated.
r A, r S, r B
eqv. Equivalent and Record
CR0 is updated to reflect the result.
XOR Instructions r A is loaded with the logical result ( r S) XOR ( r B).
xor XOR
CR0 is
not
updated.
r A, r S, r B
xor. XOR and Record
CR0 is updated to reflect the result.
XOR-Immediate Instructions r A is loaded with the logical result ( r S) XOR UIMM.
xori XOR Immediate
CR0 is
not
updated.
r A, r S,UIMM
XOR Immediate-Shifted Instructions
r A is loaded with the logical result ( r S) XOR (UIMM
||
0x0000)
xoris
XOR Immediate Shifted
CR0 is
not
updated.
r
A,
r
S,UIMM