ASR (immediate, predicated)
Arithmetic shift right by immediate (predicated)
Shift right by immediate, preserving the sign bit, each active element of the source vector, and destructively place the results in the corresponding elements of the source vector. The immediate shift amount is an unsigned value in the range 1 to number of bits per element. Inactive elements in the destination vector register remain unmodified.
Green
True
True
True
True
0
0
0
0
0
1
0
0
0
0
0
0
0
0
1
0
0
ASR <Zdn>.<T>, <Pg>/M, <Zdn>.<T>, #<const>
if !IsFeatureImplemented(FEAT_SVE) && !IsFeatureImplemented(FEAT_SME) then UNDEFINED;
constant bits(4) tsize = tszh:tszl;
if tsize == '0000' then UNDEFINED;
constant integer esize = 8 << HighestSetBit(tsize);
constant integer g = UInt(Pg);
constant integer dn = UInt(Zdn);
constant integer shift = (2 * esize) - UInt(tsize:imm3);
<Zdn>
Is the name of the source and destination scalable vector register, encoded in the "Zdn" field.
<T>
Is the size specifier,
tszh
tszl
<T>
00
00
RESERVED
00
01
B
00
1x
H
01
xx
S
1x
xx
D
<Pg>
Is the name of the governing scalable predicate register P0-P7, encoded in the "Pg" field.
<const>
Is the immediate shift amount, in the range 1 to number of bits per element, encoded in "tszh:tszl:imm3".
CheckSVEEnabled();
constant integer VL = CurrentVL;
constant integer elements = VL DIV esize;
constant integer PL = VL DIV 8;
constant bits(VL) operand1 = Z[dn, VL];
constant bits(PL) mask = P[g, PL];
bits(VL) result;
for e = 0 to elements-1
constant bits(esize) element1 = Elem[operand1, e, esize];
if ActivePredicateElement(mask, e, esize) then
Elem[result, e, esize] = ASR(element1, shift);
else
Elem[result, e, esize] = Elem[operand1, e, esize];
Z[dn, VL] = result;