> I don't see that. That's definitely not what GCC expects here,
> the left-most word of the doubleword should be unchanged.
>
> Your testcase should be a dg-do-run and probably more like
>
> NOMIPS16 int __attribute__((noipa)) test (const unsigned char *buf)
> {
> int val;
> ((unsigned char*)&val)[0] = *buf++;
> ((unsigned char*)&val)[1] = *buf++;
> ((unsigned char*)&val)[2] = *buf++;
> ((unsigned char*)&val)[3] = *buf++;
> return val;
> }
> int main()
> {
> int val = 0x01020304;
> val = test (&val);
> if (val != 0x01020304)
> abort ();
> }
>
> not sure if I got endianess correct. Now, the question is what
> WORD_REGISTER_OPERATIONS implies for a bitfield insert and what
> the MIPS ABI says for returning SImode.
WORD_REGISTER_OPERATIONS must *not* be taken account for bit-fields, see e;g.
word_register_operation_p:
/* Return true if X is an operation that always operates on the full
registers for WORD_REGISTER_OPERATIONS architectures. */
inline bool
word_register_operation_p (const_rtx x)
{
switch (GET_CODE (x))
{
case CONST_INT:
case ROTATE:
case ROTATERT:
case SIGN_EXTRACT:
case ZERO_EXTRACT:
return false;
default:
return true;
}
}
--
Eric Botcazou
