------- Comment #9 from dje at gcc dot gnu dot org 2008-01-22 15:59 -------
GCC does not use the load and store multiple instructions because the source
file declares r29 a global variable:
register volatile gd_t *gd asm ("r29");
The bug fix mentioned above inhibits GCC from using lmw/stmw if global
registers are present in the contiguous register sequence because GCC
incorrectly would overwrite the register. If the register variable declaration
is removed, GCC uses the lmw/stmw instructions. r29 is a bad choice for a
global register variable.
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=34903
