Delete comment from: Ken Shirriff's blog

Teen Aeg said...

While most proprietary RISC CPUs of the 1980-1990s era did not support BCD calculations, as you pointed out in your blog post, there is one big exception: HP's PA-RISC series of CPUs did support BCD with a help of instructions similar to Intel's DAA. And the reason is because PA-RISC was targeted to both UNIX and commercial (HP's MPE operating system) markets. In addition, IBM's PowerPC might have supported it in its PowerPC AS incarnation designed for the commercial AS400 series of IBM systems. However, since there's no publicly available info on PowerPC AS (as far as I know), this remains only just a theory...

Jan 31, 2023, 8:22:42 AM

Posted to Understanding the x86's Decimal Adjust after Addition (DAA) instruction