Softsign on LLVM CPU

Softsign Activation

⏳ PENDING — not yet measured

Operation

Operation	Softsign (`bpd_softsign`)
Formula	f(x) = x / (1 + \|x\|)
Category	Rational

Kernel Specification (Prolog/Logtalk)

This is the backend-neutral op_expr fact that specifies the operation. The same term is lowered to LLVM IR, CUDA C, MLIR, and every other backend — one specification, many targets.

op_expr(bpd_softsign,
    div(var, add(const(1.0), call(abs, var)))).

Backend

Backend	LLVM CPU (`llvm_cpu`)
Target	cpu
Description	LLVM IR targeting x86-64 CPU. Compiled with llc + clang.

Verification

This (operation, backend) pair has not yet been measured. When the backend emitter and verification infrastructure are ready, this cell will be tested against the PyTorch reference.