LD1SW (scalar plus vector)

Gather load signed words to vector (vector index)

This instruction performs a gather load of signed words to Active elements of a vector register from memory addresses generated by a 64-bit scalar base plus vector index. The index values are optionally first sign-extended or zero-extended from 32 to 64 bits and then optionally multiplied by 4. Inactive elements will not cause a read from Device memory or signal faults, and are set to zero in the destination vector.

This instruction is illegal when executed in Streaming SVE mode, unless FEAT_SME_FA64 is implemented and enabled.

It has encodings from 4 classes: 32-bit unpacked scaled offset , 32-bit unpacked unscaled offset , 64-bit scaled offset and 64-bit unscaled offset

32-bit unpacked scaled offset
(FEAT_SVE)

Decode for this encoding

if !IsFeatureImplemented(FEAT_SVE) then EndOfDecode(Decode_UNDEF); end; let t : integer = UInt(Zt); let n : integer = UInt(Rn); let m : integer = UInt(Zm); let g : integer = UInt(Pg); let esize : integer{} = 64; let msize : integer{} = 32; let offs_size : integer{} = 32; let unsigned : boolean = FALSE; let offs_unsigned : boolean = xs == '0'; let scale : integer = 2;

32-bit unpacked unscaled offset
(FEAT_SVE)

Decode for this encoding

if !IsFeatureImplemented(FEAT_SVE) then EndOfDecode(Decode_UNDEF); end; let t : integer = UInt(Zt); let n : integer = UInt(Rn); let m : integer = UInt(Zm); let g : integer = UInt(Pg); let esize : integer{} = 64; let msize : integer{} = 32; let offs_size : integer{} = 32; let unsigned : boolean = FALSE; let offs_unsigned : boolean = xs == '0'; let scale : integer = 0;

64-bit scaled offset
(FEAT_SVE)

Decode for this encoding

if !IsFeatureImplemented(FEAT_SVE) then EndOfDecode(Decode_UNDEF); end; let t : integer = UInt(Zt); let n : integer = UInt(Rn); let m : integer = UInt(Zm); let g : integer = UInt(Pg); let esize : integer{} = 64; let msize : integer{} = 32; let offs_size : integer{} = 64; let unsigned : boolean = FALSE; let offs_unsigned : boolean = TRUE; let scale : integer = 2;

64-bit unscaled offset
(FEAT_SVE)

Decode for this encoding

if !IsFeatureImplemented(FEAT_SVE) then EndOfDecode(Decode_UNDEF); end; let t : integer = UInt(Zt); let n : integer = UInt(Rn); let m : integer = UInt(Zm); let g : integer = UInt(Pg); let esize : integer{} = 64; let msize : integer{} = 32; let offs_size : integer{} = 64; let unsigned : boolean = FALSE; let offs_unsigned : boolean = TRUE; let scale : integer = 0;