SVE Instruction List by Dougall Johnson
See "SMULLB (vectors)" in the exploration tools

SMULLB (vectors): Signed multiply long (bottom)

SMULLB Zd.S, Zn.H, Zm.H (SVE2 (SME
svint32_t svmullb[_s32](svint16_t op1, svint16_t op2)

128-bit SVE

For each even signed 16-bit integer set the double-width (3) to (1) * (2).

256-bit SVE

For each even signed 16-bit integer set the double-width (3) to (1) * (2).

512-bit SVE

For each even signed 16-bit integer set the double-width (3) to (1) * (2).
Larger sizes

1024-bit SVE

For each even signed 16-bit integer set the double-width (3) to (1) * (2).

2048-bit SVE

For each even signed 16-bit integer set the double-width (3) to (1) * (2).
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Inspired by and based on the x86/x64 SIMD Instruction List by Daytime.