* loop.c (strength_reduce): Call check_ext_dependant_givs.
Properly extend the biv initial value for the giv. (record_biv): Zero ext_dependant. (record_giv): New argument ext_val. Update all callers. (general_induction_var): Likewise. (consec_sets_giv): Likewise. (simplify_giv_expr): Likewise. Fill in ext_val if we find a sign-extend, zero-extend, or truncate. (combine_givs_p): Make sure modes are compatible. (check_ext_dependant_givs): New. (extend_value_for_giv): New. * loop.h (struct induction): Add ext_dependant. * unroll.c (iteration_info): Extend the biv initial value for the giv. (find_splittable_givs): Likewise. (final_giv_value): Likewise. git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@36250 138bc75d-0d04-0410-961f-82ee72b054a4
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