Function std::intrinsics::fmaf64

pub unsafe extern "rust-intrinsic" fn fmaf64(a: f64, b: f64, c: f64) -> f64

🔬 This is a nightly-only experimental API. (core_intrinsics)

intrinsics are unlikely to ever be stabilized, instead they should be used through stabilized interfaces in the rest of the standard library

为 f64 值返回 a * b + c。

此内联函数的稳定版本是 f64::mul_add