> Date: Fri, 15 Oct 2010 18:54:44 -0400 > To: stds-1788 <stds-1788@xxxxxxxxxxxxxxxxx> > From: Michel Hack <hack@xxxxxxxxxxxxxx> > Subject: (long) sNaNs not what they could be... > > . . . > > Btw, some machines (HP's PA-RISC if I remember correctly) > do use a 1-bit to denote SNaN, and all-ones is an SNaN, but > this complicates the Quieting operation, which may have to > insert another 1-bit to prevent decaying to Infinity. > > Michel. > Oh, Michel, I know this all too well. I was HP's "man on the 754 committee" in 1980. I was on the team that designed that first generation of floating-point chips at HP in 1981. I made that choice. The wrong one as it happens. Dan
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