SVE Instruction List by Dougall Johnson
FIRSTP: Scalar index of first true predicate element (predicated)
FIRSTP Xd, Pg, Pn.B (SVE2.2 (SME2.2
128-bit SVE
Set (3) to the index of the first (rightmost) element where the corresponding predicate bit is set in both (1) and (2). If no such element exists, set (3) to -1.
256-bit SVE
Set (3) to the index of the first (rightmost) element where the corresponding predicate bit is set in both (1) and (2). If no such element exists, set (3) to -1.
512-bit SVE
Set (3) to the index of the first (rightmost) element where the corresponding predicate bit is set in both (1) and (2). If no such element exists, set (3) to -1.
Larger sizes
1024-bit SVE
Set (3) to the index of the first (rightmost) element where the corresponding predicate bit is set in both (1) and (2). If no such element exists, set (3) to -1.
2048-bit SVE
Set (3) to the index of the first (rightmost) element where the corresponding predicate bit is set in both (1) and (2). If no such element exists, set (3) to -1.
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Inspired by and based on the x86/x64 SIMD Instruction List by Daytime.