See "SQDECP (scalar)" in the exploration tools

SQDECP (scalar): Signed saturating decrement scalar by count of true predicate elements

SQDECP Xdn, Pm.S, Wdn (SVE (SME

int32_t svqdecp[_n_s32]_b32(int32_t op, svbool_t pg)

128-bit SVE

Considering only predicate bits from (1) corresponding to 32-bit elements, set (3) to (2) − popcount( (1) ), with signed saturation to −0x80000000, and sign extension to 64-bit.

256-bit SVE

Considering only predicate bits from (1) corresponding to 32-bit elements, set (3) to (2) − popcount( (1) ), with signed saturation to −0x80000000, and sign extension to 64-bit.

512-bit SVE

Considering only predicate bits from (1) corresponding to 32-bit elements, set (3) to (2) − popcount( (1) ), with signed saturation to −0x80000000, and sign extension to 64-bit.

Larger sizes

1024-bit SVE

Considering only predicate bits from (1) corresponding to 32-bit elements, set (3) to (2) − popcount( (1) ), with signed saturation to −0x80000000, and sign extension to 64-bit.

2048-bit SVE

Considering only predicate bits from (1) corresponding to 32-bit elements, set (3) to (2) − popcount( (1) ), with signed saturation to −0x80000000, and sign extension to 64-bit.

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