TAILIEUCHUNG - ARM Architecture Reference Manual- P22

ARM Architecture Reference Manual- P22: The ARM instruction set architecture has evolved significantly since it was first developed, and will continue to be developed in the future. In order to be precise about which instructions exist in any particular ARM implementation, five major versions of the instruction set have been defined to date. | VFP Instructions Notes Absolute value function The function abs x means a copy of x with its sign bit forced to zero as defined in the Appendix to the IEEE 754-1985 standard. Flush-to-zero mode The FZ bit of the FPSCR does not affect the operand or result of this instruction. Vectors When the LEN field of the FPSCR indicates scalar mode vector length 1 FABSD performs just one absolute value operation and vec_len 1 Dd 0 Dd and Dm 0 Dm. When the LEN field indicates a vector mode vector length 1 FABSD might perform more than one absolute value operation. Addressing Mode 4 - Double-precision vectors monadic on page C5-19 describes how FABSD encodes the registers it uses and how vec_len Dd i and Dm i are determined. Signaling NaNs To comply with the VFP architecture FABSD must not generate an exception even if the value in its source register is a signaling NaN. This is a more stringent requirement than the one in the Appendix to the IEEE 754-1985 standard. ARM DDI 0100E Copyright 1996-2000 ARM Limited. All rights reserved. C4-3 VFP Instructions FABSS 31 28 27 26 25 24 23 22 21 20 19 18 17 16 15 12 11 10 9 8 7 6 5 4 3 0 cond 1110 1 D 1 1 0 0 0 0 Fd 10 10 1 1 M 0 Fm The FABSS Floating-point Absolute Value Single-precision instruction writes the absolute value of a single-precision register to another single-precision register. It can also perform a vector version of this operation. Syntax FABSS cond Sd Sm where cond Is the condition under which the instruction is executed. The conditions are defined in The condition field on page A3-5. If cond is omitted the AL always condition is used. Sd Specifies the destination register. Its number is encoded as Fd top 4 bits and D bottom bit . Sm Specifies the source register. Its number is encoded as Fm top 4 bits and M bottom bit . Architecture version All Exceptions None Operation if ConditionPassed cond then for i 0 to vec_len-1 Sd i abs Sm i C4-4 Copyright 1996-2000 ARM Limited. All rights reserved. ARM DDI 0100E VFP .

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