PA RISC1.1 PARISC 2.0 Architecture

[Srinivasan S_1]

Hi,
We have an application that interfaces with MQ Series which is PA RISC1.1.

But target OS is PA RISC 2.0 type. So kindly confirm,

a) I think PA RISC1.1 shared Library cannot go hand in with hand PARISC 2.0 ? ( may be silly question,I different architecture cannot go hand in hand ) Is that right ?
b) If we need to run both in PA RISC 1.1 and RISC 2.0 we can use DA Portable to do the same right ?

TIA.

With Regards,
Srinivasan S

[Stephen Keane]

PA RISC1.1 is 32-bit, PA RISC 2.0 is 64-bit. You can run a 32-bit app on a 64-bit machine, but not the other way around.

[A. Clay Stephenson]

Actually, the PA-RISC 1.1 code will run perfectly well on PA-RISC 2.0 platforms but the converse is not true. +DAPortable code will run on all machines. By default, the model the compiler is that of the machine on which it is compiled; you override this behavior by using +DAPortable on natibe DA 2.0 machines to produce code that will will anywhere.

[Srinivasan S_1]

Thanks Stephen Keane/A. Clay Stephenson,

I thought +DD64 alone will make it 64 Bit application. But even changing +DA2.0 also make it 64 Bit is something new info for me.

Is that so ?

I shall read the literature further more.

Thanks anyway.

With Regards,
Srinivasan S

[A. Clay Stephenson]

All +DAPortable and +DA1.1 code is both PA-RISC 1.1 code and uses 32-bit pointers. The PA 1.x instruction set is a subset of the PA 2.x instruction set. It is possible to select the 32-bit data model (+DA2.0) and the PA-RISC 2.0 instruction set; if you use +DA2.0W (same as +DD64) then you select both the PA 2.0 instruction set and the 64-bit data model.

create a very simple c program, eg, "my.c"

cc +DA2.0 my.c -o my2
file my2

cc +DA2.0W my.c -o my2W
file my2W

cc +DAportable my.c -o my1
file my1

You will see that each of these produces a different instruction set/data model combination but only the +DAportable (or +DA1.1) will run on both 32-bit and 64-bit machines.

[Ted Buis]

Isn't there also a +DS1.1 and DS2.0 options to optimize for instruction sequencing for the two versions?