CLS: Count leading sign bits (predicated)

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

svuint16_t svcls[_s16]_m(svuint16_t inactive, svbool_t pg, svint16_t op)

128-bit SVE

For each 16-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 0xFFFF, the result is 15.

256-bit SVE

For each 16-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 0xFFFF, the result is 15.

512-bit SVE

For each 16-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 0xFFFF, the result is 15.

Larger sizes

1024-bit SVE

For each 16-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 0xFFFF, the result is 15.

2048-bit SVE

For each 16-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 0xFFFF, the result is 15.

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