See "SXTB, SXTH, SXTW" in the exploration tools

SXTB, SXTH, SXTW: Signed byte / halfword / word extend (predicated)

SXTW Zd.D, Pg/Z, Zn.D (SVE2.2 (SME2.2

128-bit SVE

For each 64-bit value integer set (2) to ( (1) & 0x7FFFFFFF ) − ( (1) & 0x80000000 ). This takes the low 32-bits of (1), and sign-extends it to 64-bit.

256-bit SVE

For each 64-bit value integer set (2) to ( (1) & 0x7FFFFFFF ) − ( (1) & 0x80000000 ). This takes the low 32-bits of (1), and sign-extends it to 64-bit.

512-bit SVE

For each 64-bit value integer set (2) to ( (1) & 0x7FFFFFFF ) − ( (1) & 0x80000000 ). This takes the low 32-bits of (1), and sign-extends it to 64-bit.

Larger sizes

1024-bit SVE

For each 64-bit value integer set (2) to ( (1) & 0x7FFFFFFF ) − ( (1) & 0x80000000 ). This takes the low 32-bits of (1), and sign-extends it to 64-bit.

2048-bit SVE

For each 64-bit value integer set (2) to ( (1) & 0x7FFFFFFF ) − ( (1) & 0x80000000 ). This takes the low 32-bits of (1), and sign-extends it to 64-bit.

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Inspired by and based on the x86/x64 SIMD Instruction List by Daytime.