In message Pine.LNX.4.58.0403161421230.24165@strange.wwd.ca you wrote:
to my amazement, the ELDK compiler made the same "mistake" (in quotes because it's entirely possible that it's my limited ppc405 knowledge that leads me to thinks it's a mistake):
...
(notice that this is the XIo_Out32() function generated by Xilinx XPS)
Which sort of code does this tool generate? C code? Then it would be indeed a compiler probile, and I definitely would like to see this C code.
Looking at the PP405's UM, i see this in the stw instruction page:
This behaviour is standard and well-known on PPC.
This looks like a gcc problem, but perhaps someone on this list could
I don;t thinkthat GCC has such a serious problem.
offer some guidance:
- do all powerpc's, not just the 405, have this behavior (of using 0
instead of r0 when the rA field is 0)?
Yes, this is standard on all PPC.
- if so, why would these compilers generate code that seems flawed?
I don't think that a compiler would generate such code.
- if not, are we supposed to invoke the compiler in a particular way?
Please show us the source code that produces such output; without all discussion is in vain.
Best regards,
Wolfgang Denk