SVE Instruction List by Dougall Johnson
See "RSUBHNT" in the exploration tools

RSUBHNT: Rounding subtract narrow high part (top)

RSUBHNT Zd.H, Zn.S, Zm.S (SVE2 (SME
svint16_t svrsubhnt[_s32](svint16_t even, svint32_t op1, svint32_t op2)
svuint16_t svrsubhnt[_u32](svuint16_t even, svuint32_t op1, svuint32_t op2)

128-bit SVE

For each 32-bit integer set the odd 16-bit elements of (3) to ( (1) − (2) + 0x8000 ) >> 16, preserving even elements.

256-bit SVE

For each 32-bit integer set the odd 16-bit elements of (3) to ( (1) − (2) + 0x8000 ) >> 16, preserving even elements.

512-bit SVE

For each 32-bit integer set the odd 16-bit elements of (3) to ( (1) − (2) + 0x8000 ) >> 16, preserving even elements.
Larger sizes

1024-bit SVE

For each 32-bit integer set the odd 16-bit elements of (3) to ( (1) − (2) + 0x8000 ) >> 16, preserving even elements.

2048-bit SVE

For each 32-bit integer set the odd 16-bit elements of (3) to ( (1) − (2) + 0x8000 ) >> 16, preserving even elements.
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Inspired by and based on the x86/x64 SIMD Instruction List by Daytime.