(old) | htmldiff from- | (new) |
Conditional Select returns, in the destination register, the value of the first source register if the condition is TRUE, and otherwise returns the value of the second source register.
31 | 30 | 29 | 28 | 27 | 26 | 25 | 24 | 23 | 22 | 21 | 20 | 19 | 18 | 17 | 16 | 15 | 14 | 13 | 12 | 11 | 10 | 9 | 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
sf | 0 | 0 | 1 | 1 | 0 | 1 | 0 | 1 | 0 | 0 | Rm | cond | 0 | 0 | Rn | Rd | |||||||||||||||
op | o2 |
integer d = UInt(Rd);
integer n = UInt(Rn);
integer m = UInt(Rm);
integer datasize = if sf == '1' then 64 else 32;integer datasize = if sf == '1' then 64 else 32;
bits(4) condition = cond;
boolean else_inv = (op == '1');
boolean else_inc = (o2 == '1');
<Wd> | Is the 32-bit name of the general-purpose destination register, encoded in the "Rd" field. |
<Wn> | Is the 32-bit name of the first general-purpose source register, encoded in the "Rn" field. |
<Wm> | Is the 32-bit name of the second general-purpose source register, encoded in the "Rm" field. |
<Xd> | Is the 64-bit name of the general-purpose destination register, encoded in the "Rd" field. |
<Xn> | Is the 64-bit name of the first general-purpose source register, encoded in the "Rn" field. |
<Xm> | Is the 64-bit name of the second general-purpose source register, encoded in the "Rm" field. |
<cond> | Is one of the standard conditions, encoded in the "cond" field in the standard way. |
bits(datasize) result;
bits(datasize) operand1 = X[n];
bits(datasize) operand2 = X[m];
if ConditionHolds(cond) then
(condition) then
result = operand1;
else
result = operand2; result = operand2;
if else_inv then result = NOT(result);
if else_inc then result = result + 1;
X[d] = result;
If PSTATE.DIT is 1:
Internal version only: isa v30.41, AdvSIMD v27.08, pseudocode r8p5_00bet2_rc5, sve v8.5-00bet10_rc5
; Build timestamp: 2019-03-28T072019-03-28T06:1434
Copyright © 2010-2019 Arm Limited or its affiliates. All rights reserved. This document is Non-Confidential.
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