(old) | htmldiff from- | (new) |
Signed saturating decrement scalar by countactive ofpredicate trueelement predicate elements.count.
Counts the number of trueactive elements in the source predicate and then uses the result to decrement the scalar destination. The result is saturated to the source general-purpose register's signed integer range. A 32-bit saturated result is then sign-extended to 64 bits.
It has encodings from 2 classes: 32-bit and 64-bit
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 |
0 | 0 | 1 | 0 | 0 | 1 | 0 | 1 | size | 1 | 0 | 1 | 0 | 1 | 0 | 1 | 0 | 0 | 0 | 1 | 0 | 0 | Pm | Rdn |
if !HaveSVE() then UNDEFINED;
integer esize = 8 << UInt(size);
integer m =integer g = UInt(Pm);
(Pg);
integer dn = UInt(Rdn);
boolean unsigned = FALSE;
integer ssize = 32;
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 |
0 | 0 | 1 | 0 | 0 | 1 | 0 | 1 | size | 1 | 0 | 1 | 0 | 1 | 0 | 1 | 0 | 0 | 0 | 1 | 1 | 0 | Pm | Rdn |
if !HaveSVE() then UNDEFINED;
integer esize = 8 << UInt(size);
integer m =integer g = UInt(Pm);
(Pg);
integer dn = UInt(Rdn);
boolean unsigned = FALSE;
integer ssize = 64;
<Xdn> | Is the 64-bit name of the source and destination general-purpose register, encoded in the "Rdn" field. |
<Pm | Is the name of the source |
<T> |
Is the size specifier,
encoded in
size:
|
<Wdn> | Is the 32-bit name of the source and destination general-purpose register, encoded in the "Rdn" field. |
CheckSVEEnabled();
integer elements = VL DIV esize;
bits(ssize) operand1 =bits(PL) mask = P[g];
bits(ssize) operand = X[dn];
bits(PL) operand2 = P[m];
[dn];
bits(ssize) result;
integer count = 0;
for e = 0 to elements-1
if ElemP[operand2, e, esize] == '1' then
[mask, e, esize] == '1' then
count = count + 1;
integer element = Int(operand1, unsigned);
(operand, unsigned);
(result, -) = SatQ(element - count, ssize, unsigned);
X[dn] = Extend(result, 64, unsigned);
If PSTATE.DIT is 1:
Internal version only: isa v30.44v30.42, AdvSIMD v27.08, pseudocode v8.5-2019-06_rc2-5-g22901f2future-20190403, sve v2019-06_rc4v8.5-00bet10_rc5
; Build timestamp: 2019-06-26T222019-04-17T09:0458
Copyright © 2010-2019 Arm Limited or its affiliates. All rights reserved. This document is Non-Confidential.
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