------- Comment #8 from bonzini at gnu dot org 2008-03-05 13:21 -------
Should be handled by this code in simplify_subreg:
/* A SUBREG resulting from a zero extension may fold to zero if
it extracts higher bits that the ZERO_EXTEND's source bits. */
if (GET_CODE (op) == ZERO_EXTEND
&& bitpos >= GET_MODE_BITSIZE (GET_MODE (XEXP (op, 0))))
return CONST0_RTX (outermode);
fwprop does not because the memory is written to. Can anyone run spec moving
fwprop *before* CSE instead of after?
--
bonzini at gnu dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
BugsThisDependsOn| |13724
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=35281
