[project @ 2001-12-20 15:20:37 by sewardj]
Generate floating-point comparisons on x86 which deal with NaNs in what I assume is an IEEE854 compliant fashion. For == >= > <= < if either arg is a NaN, produce False, and for /= if either arg is a NaN, produce True. This is the behaviour that gcc has, by default. Requires some ultramagical x86 code frags to be emitted. A big comment in PprMach explains how it works.