[Bug target/35788] MIPS stack overflow caused by addui instruction

[rsandifo at gcc dot gnu dot org]

------- Comment #9 from rsandifo at gcc dot gnu dot org  2008-04-30 21:12 -------
Sorry, I don't understand what you think the bug is.  You say:

> For some reason the compiler allocates
> memory on the stack by issuing a Addui sp,sp with some negative number, however
> the negative number is only sixteen bits and therefore because the instruction
> is an add unsigned immediate this negative number gets treated like a positve
> number.

But you seem to misunderstand how the MIPS addiu instruction works.
The 16-bit immediate operand is sign-extended.

Do you actually get an execution failure?

Richard


-- 

rsandifo at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |rsandifo at gcc dot gnu dot
                   |                            |org


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=35788