  Let $\mathcal M$ be a holonomic algebraic $\mathcal D$-module on the affine
line, regular everywhere including at infinity. Malgrange gave a complete
description of the Fourier-Laplace transform $\widehat{\mathcal M}$, including
its Stokes multipliers at infinity, in terms of the quiver of $\mathcal M$. Let
$F$ be the perverse sheaf of holomorphic solutions to $\mathcal M$. By the
irregular Riemann-Hilbert correspondence, $\widehat{\mathcal M}$ is determined
by the enhanced Fourier-Sato transform $F^\curlywedge$ of $F$. Our aim here is
to recover Malgrange's result in a purely topological way, by computing
$F^\curlywedge$ using Borel-Moore cycles. In this paper, we also consider some
irregular $\mathcal M$'s, like in the case of the Airy equation, where our
cycles are related to steepest descent paths.
