SVE Instruction List by Dougall Johnson
See "DECP (scalar)" in the exploration tools

DECP (scalar): Decrement scalar by count of true predicate elements

DECP Xdn, Pm.B (SVE (SME

128-bit SVE

Set (3) to (2) − popcount( (1) ).

256-bit SVE

Set (3) to (2) − popcount( (1) ).

512-bit SVE

Set (3) to (2) − popcount( (1) ).
Larger sizes

1024-bit SVE

Set (3) to (2) − popcount( (1) ).

2048-bit SVE

Set (3) to (2) − popcount( (1) ).
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Inspired by and based on the x86/x64 SIMD Instruction List by Daytime.