Bug in NIOS2 GCC ?

Hi Sgan,

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With this code, you can be sure you get wrong results...[/b]

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You are correct. Which is why I recommend not using the defective builtin.

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Thank you very much for finding this issue in the compiler. You are correct that there is a bug here, __builtin_ldbio() should be translating to a ldbio instruction, not a ldhio. This issue will be fixed for the next release of the compiler. If this is causing you a particular issue, I recommend either using __builtin_ldbuio() and sign extending it, or using extended assembly statements.[/b]

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Let me elaborate on the above. What I recommend your code look like is this:

int testsub1(void) {
  char x = __builtin_ldbuio ((void *)0x1000);
  return (int)x; // sign extend x
}

Or using asm statements:

int testsub2(void) {
  int x;
  asm ("ldbio %, 0(%)" :  "=r" (x) :  "r" (0x1000));
  return x;
}