https://www.ibm.com/support/pages/sites/default/files/2021-05/SA22-7871-10.pdf includes a list of assembler Instructions.
On Wed, Aug 6, 2025 at 2:22 PM David Cole <[email protected]> wrote: > I apologize is my initial post was unclear. My question is about > IBM's choice of instruction names, not about functionality. > > Also, this has nothing whatsoever to do with the C language. > > Let me edit my post and re-present it here... > > > > In Principles, these two machine instructions are presented: > - LB loads a byte into a register and sign-extends it. > - LLC also loads a byte into a register but then zero pads it. > That's all pretty clear, but... > > > > My question is, why did IBM choose have the instruction's name end > with B in one case and with C in the other? > - On the one hand, Why didn't they choose LC (instead of LB) as > that instruction's name? > - Or on the other, why didn't they choose LLB (instead of LLC) as > that instruction's name? > > > > Just curious. > > Dave Cole > > > > > > At 8/6/2025 05:42 AM, David Cole wrote: > >In Principles: > > - LB loads a byte into a register and sign-extends it. > > - LLC also loads a byte into a register but then zero pads it. > >That's all pretty clear, but... > > > >Why use B in one case and C in the other? > > - Why not LC instead of LB? > > - Or why not LLB instead of LLC? > > > >"Inquiring minds what to know." > > > >Dave Cole > > > >---------------------------------------------------------------------- > >For IBM-MAIN subscribe / signoff / archive access instructions, > >send email to [email protected] with the message: INFO IBM-MAIN > > ---------------------------------------------------------------------- > For IBM-MAIN subscribe / signoff / archive access instructions, > send email to [email protected] with the message: INFO IBM-MAIN > -- Mike A Schwab, Springfield IL USA Where do Forest Rangers go to get away from it all? ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
