Sigmoid on LLVM CPU

Sigmoid Activation (Logistic Function)

⏳ PENDING — not yet measured

Operation

Operation	Sigmoid (`bpd_sigmoid`)
Formula	f(x) = 1 / (1 + exp(-x))
Category	Transcendental (exp)

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_sigmoid,
    div(const(1.0),
        add(const(1.0), call(exp, neg(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.