See "SQRDCMLAH (vectors)" in the exploration tools

SQRDCMLAH (vectors): Saturating rounding doubling complex integer multiply-add high with 270° rotate

SQRDCMLAH Zda.D, Zn.D, Zm.D, #270 (SVE2 (SME

svint64_t svqrdcmlah[_s64](svint64_t op1, svint64_t op2, svint64_t op3, 270)

128-bit SVE

For each signed 64-bit integer, set (4) as shown, given f(x,y) = ((x << 63) + y + 0x4000000000000000) >> 63, with signed saturation to 0x7FFFFFFFFFFFFFFF or −0x8000000000000000.

256-bit SVE

For each signed 64-bit integer, set (4) as shown, given f(x,y) = ((x << 63) + y + 0x4000000000000000) >> 63, with signed saturation to 0x7FFFFFFFFFFFFFFF or −0x8000000000000000.

512-bit SVE

For each signed 64-bit integer, set (4) as shown, given f(x,y) = ((x << 63) + y + 0x4000000000000000) >> 63, with signed saturation to 0x7FFFFFFFFFFFFFFF or −0x8000000000000000.

Larger sizes

1024-bit SVE

For each signed 64-bit integer, set (4) as shown, given f(x,y) = ((x << 63) + y + 0x4000000000000000) >> 63, with signed saturation to 0x7FFFFFFFFFFFFFFF or −0x8000000000000000.

2048-bit SVE

For each signed 64-bit integer, set (4) as shown, given f(x,y) = ((x << 63) + y + 0x4000000000000000) >> 63, with signed saturation to 0x7FFFFFFFFFFFFFFF or −0x8000000000000000.

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