CLS: Count leading sign bits (predicated)

CLS Zd.D, Pg/M, Zn.D (SVE (SME

svuint64_t svcls[_s64]_m(svuint64_t inactive, svbool_t pg, svint64_t op)

128-bit SVE

For each 64-bit integer set (2) to the number of leading bits that are equal to the sign bit in (1), excluding the sign bit itself. If (1) is zero or 0xFFFFFFFFFFFFFFFF, the result is 63.

256-bit SVE

For each 64-bit integer set (2) to the number of leading bits that are equal to the sign bit in (1), excluding the sign bit itself. If (1) is zero or 0xFFFFFFFFFFFFFFFF, the result is 63.

512-bit SVE

For each 64-bit integer set (2) to the number of leading bits that are equal to the sign bit in (1), excluding the sign bit itself. If (1) is zero or 0xFFFFFFFFFFFFFFFF, the result is 63.

Larger sizes

1024-bit SVE

For each 64-bit integer set (2) to the number of leading bits that are equal to the sign bit in (1), excluding the sign bit itself. If (1) is zero or 0xFFFFFFFFFFFFFFFF, the result is 63.

2048-bit SVE

For each 64-bit integer set (2) to the number of leading bits that are equal to the sign bit in (1), excluding the sign bit itself. If (1) is zero or 0xFFFFFFFFFFFFFFFF, the result is 63.

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