BDEP
Scatter lower bits into positions selected by bitmask
This instruction scatters the lowest-numbered contiguous bits within each element of the first source vector to the bit positions indicated by non-zero bits in the corresponding mask element of the second source vector, preserving their order, and set the bits corresponding to a zero mask bit to zero. This instruction is unpredicated.
ID_AA64ZFR0_EL1.BitPerm indicates whether this instruction is implemented.
This instruction is illegal when executed in Streaming SVE mode, unless FEAT_SME_FA64 is implemented and enabled.
Green
False
True
SM_0_only
0
1
0
0
0
1
0
1
0
1
0
1
1
0
1
BDEP <Zd>.<T>, <Zn>.<T>, <Zm>.<T>
if !IsFeatureImplemented(FEAT_SVE) || !IsFeatureImplemented(FEAT_SVE_BitPerm) then UNDEFINED;
constant integer esize = 8 << UInt(size);
constant integer n = UInt(Zn);
constant integer m = UInt(Zm);
constant integer d = UInt(Zd);
<Zd>
Is the name of the destination scalable vector register, encoded in the "Zd" field.
<T>
Is the size specifier,
size
<T>
00
B
01
H
10
S
11
D
<Zn>
Is the name of the first source scalable vector register, encoded in the "Zn" field.
<Zm>
Is the name of the second source scalable vector register, encoded in the "Zm" field.
CheckNonStreamingSVEEnabled();
constant integer VL = CurrentVL;
constant integer elements = VL DIV esize;
constant bits(VL) data = Z[n, VL];
constant bits(VL) mask = Z[m, VL];
bits(VL) result;
for e = 0 to elements - 1
Elem[result, e, esize] = BitDeposit(Elem[data, e, esize], Elem[mask, e, esize]);
Z[d, VL] = result;