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ABS

Absolute value (vector). This instruction calculates the absolute value of each vector element in the source SIMD&FP register, puts the result into a vector, and writes the vector to the destination SIMD&FP register.

Depending on the settings in the CPACR_EL1, CPTR_EL2, and CPTR_EL3 registers, and the current Security state and Exception level, an attempt to execute the instruction might be trapped.

Absolute value (vector). This instruction calculates the absolute value of each vector element in the source SIMD&FP register, puts the result into a vector, and writes the vector to the destination SIMD&FP register.

Depending on the settings in the CPACR_EL1, CPTR_EL2, and CPTR_EL3 registers, and the current Security state and Exception level, an attempt to execute the instruction might be trapped.

It has encodings from 2 classes: Scalar and Vector

Scalar

313029282726252423222120191817161514131211109876543210
01011110size100000101110RnRd
U

ABS <V><d>, <V><n>

integer d = UInt(Rd); integer n = UInt(Rn); if size != '11' then UNDEFINED; integer esize = 8 << UInt(size); integer datasize = esize; integer elements = 1; boolean neg = (U == '1');

Vector

313029282726252423222120191817161514131211109876543210
0Q001110size100000101110RnRd
U

ABS <Vd>.<T>, <Vn>.<T>

integer d = UInt(Rd); integer n = UInt(Rn); if size:Q == '110' then UNDEFINED; integer esize = 8 << UInt(size); integer datasize = if Q == '1' then 128 else 64; integer elements = datasize DIV esize; boolean neg = (U == '1');

Assembler Symbols

<V>

Is a width specifier, encoded in size:

size<V>
0xRESERVED
10RESERVED
11D
<V> Is a width specifier, encoded in size:
size<V>
0xRESERVED
10RESERVED
11D
<d>

Is the number of the SIMD&FP destination register, encoded in the "Rd" field.

<n>

Is the number of the SIMD&FP source register, encoded in the "Rn" field.

<Vd>

Is the name of the SIMD&FP destination register, encoded in the "Rd" field.

<T>

Is an arrangement specifier, encoded in size:Q:

sizeQ<T>
0008B
00116B
0104H
0118H
1002S
1014S
110RESERVED
1112D
<T> Is an arrangement specifier, encoded in size:Q:
sizeQ<T>
0008B
00116B
0104H
0118H
1002S
1014S
110RESERVED
1112D
<Vn>

Is the name of the SIMD&FP source register, encoded in the "Rn" field.

Operation

CheckFPAdvSIMDEnabled64(); bits(datasize) operand = V[n]; bits(datasize) result; integer element; for e = 0 to elements-1 element = SInt(Elem[operand, e, esize]); if neg then element = -element; else element = Abs(element); Elem[result, e, esize] = element<esize-1:0>; V[d] = result;

Operational information

If PSTATE.DIT is 1:


Internal version only: isa v32.12v32.06, AdvSIMD v29.04, pseudocode v2020-09_xmlv2020-06_rel, sve v2020-09_rc3v2020-06_rel0 ; Build timestamp: 2020-11-18T172020-07-03T12:2342

Copyright © 2010-2020 Arm Limited or its affiliates. All rights reserved. This document is Non-Confidential.

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