* Makefile.in (OBJS): Add gimple-ssa-isolate-paths.o
* common.opt (-fisolate-erroneous-paths): Add option and
documentation.
* gimple-ssa-isolate-paths.c: New file.
* gimple.c (check_loadstore): New function.
(infer_nonnull_range): Moved into gimple.c from tree-vrp.c
Verify OP is in the argument list and the argument corresponding
to OP is a pointer type. Use operand_equal_p rather than
pointer equality when testing if OP is on the nonnull list.
Use check_loadstore rather than count_ptr_derefs. Handle
GIMPLE_RETURN statements.
* tree-vrp.c (infer_nonnull_range): Remove.
* gimple.h (infer_nonnull_range): Declare.
* opts.c (default_options_table): Add
* OPT_fisolate_erroneous_paths.
* passes.def: Add pass_isolate_erroneous_paths.
* timevar.def (TV_ISOLATE_ERRONEOUS_PATHS): New timevar.
* tree-pass.h (make_pass_isolate_erroneous_paths): Declare.
* tree-ssa.c (struct count_ptr_d): Remove.
(count_ptr_derefs, count_uses_and_derefs): Remove.
* tree-ssa.h (count_uses_and_derefs): Remove.
* gcc.dg/pr38984.c: Add -fno-isolate-erroneous-paths.
* gcc.dg/tree-ssa/isolate-1.c: New test.
* gcc.dg/tree-ssa/isolate-2.c: New test.
* gcc.dg/tree-ssa/isolate-3.c: New test.
* gcc.dg/tree-ssa/isolate-4.c: New test.
From-SVN: r204414
