signed unsiged add instruction

Hello,

In MIPS architecture there is instructions to add signed integer - ADD
for instance - and instructions to add signed integer - ADDU for
instance. Other architecture (like x86 for example) does not have
these different instructions.

What are the advantages to have signed/unsigned add instructions?
What's the trend for modern architecture in that respect?

Thank you, G.

.

Relevant Pages

  • RE: z/OS on the ISERIES
    ... "Although the System/360 architecture was originally designed to support ... Instructions and data formats of the architecture are for the most part ... EBCDIC, not the zSeries hardware. ... Subject: z/OS on the ISERIES ...
    (bit.listserv.ibm-main)
  • Re: 10 bit per channel YUV with alpha
    ... Aren't those, like, Pentium specific details which aren't really relevant anymore..? ... Intel has like 3 major architecture designs since then for implementing the IA32.. ... Then AMD has their own architecture, which again doesn't benefit much if at all from pairing instructions in specified manner. ... memory read requests can create arbitrary bottlenecks and dependencies.. ...
    (microsoft.public.win32.programmer.directx.video)
  • Re: [NEWBIE] i686 architecture
    ... > met with RISC and CISC architectures), ... Though those manuals are for the Pentium 4, the architecture is largely the ... eax - accumulator reg; usually encodes shorter than other instructions; used ... any register can be used in a general-purpose fashion. ...
    (comp.lang.asm.x86)
  • Re: New Microprocessor architecture
    ... they are not flexible enough to replace conventional CPU. ... The compiler for this architecture works differently from conventional ... data dependencies between instructions. ... Whenever all input edges of one node have tokens (all input data are ...
    (comp.arch)
  • Re: Why was VAX abandonned ?
    ... Antonio Carlini wrote: ... > the major mover to get byte loads/stores into the architecture. ... > been such a huge mistake, someone would surely have spotted it (the ... > these instructions would cause a performance issue for some people, ...
    (comp.os.vms)