http://gcc.gnu.org/bugzilla/show_bug.cgi?id=56441
--- Comment #9 from Richard Earnshaw <rearnsha at gcc dot gnu.org> 2013-02-26 17:03:10 UTC --- (In reply to comment #7) > I was looking completely wrong, the arm_addsi3 is acting wrong. > > The "add%?\\t%0, %1, %2" for "=l,%0,Py" is set at a length of 2. > (first entry in the list) > > However the "ADD r6,r6, #65" is a thumb2 instruction which is 4 bytes and not > 2. > > An "ADDS r6,r6,#65" will go right because this is a thumb instruction of 2 > bytes. > > Same for the first "SUB" in the same list. > > So I end up with a miscalculation of 2bytes. > > Perhaps it's better to make it conservative and always use length of 4. > > > I guess that this isn't the right way but I have put un-predicables in front > of > the predicable counter parts with the right length of 4. This doesn't make sense. arm_addsi3 in my copy of the sources doesn't use the Py constraint. Exactly what version of GCC are you using?
