Computer Science & Engineering Department (EBU3B) - Room 3240 office phone 858 534 9914 University of California, San Diego
On Jan 27, 2011, at 12:20 AM, prabhu wrote:
Mandeep Sandhu wrote:
I guess a 64bit processor does need 64bit addresses to reference memory. But
at the same time, if 32 bit programs are to run unmodified on 64 bit
architectures there needs to be ways in which 32bit pointers can still work.
So, I am almost 100% sure that compiling 32bit code, even on a 64bit
processor, should yield 4 for sizeof(void*)
You are 100% right. Tried this on 2 laptops:
printf("Is this a %s-bit machine?\n", ((sizeof(void*) == 4) ? "32" : "64"));
32-Bit ubuntu (10.10) on 64-bit proc:
"Is this a 32-bit machine?"
64-Bit ubuntu (10.10) on 64-bit proc:
"Is this a 64-bit machine?"
Regards,
-mandeep
Hi Mandeep,
Thanks a lot.
So is there any other way available to identify the processor
architecture using c code?? . The program needs to return correct
processor architecture(32bit or 64bit) irrespective to the OS
architecture.
Thanks,
Prabhu
Enrico Granata
Computer Science & Engineering Department (EBU3B) - Room 3240
office phone 858 534 9914
University of California, San Diego
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Someone already hinted at it, I guess:
64-bit processors have lm ("long mode") in the flags section of cpuinfo whereas 32-bit processors have not.
regards
Dharmvir Kumar
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