re PR tree-optimization/63989 (tree-ssa-strlen.c doesn't handle constant pointer plus and array refs if constant offset is smaller than known constant string length)
PR tree-optimization/63989
* params.def (PARAM_MAX_TRACKED_STRLENS): Increment default
from 1000 to 10000.
* tree-ssa-strlen.c (get_strinfo): Moved earlier.
(get_stridx): If we don't have a record for certain SSA_NAME,
but it is POINTER_PLUS_EXPR of some SSA_NAME we do with
constant offset, call get_stridx_plus_constant.
(get_stridx_plus_constant): New function.
(zero_length_string): Don't use get_stridx here.
* gcc.dg/strlenopt-27.c: New test.
From-SVN: r219362
