[RTL-ifcvt] PR rtl-optimization/68841: Make sure one basic block doesn't clobber CC reg usage of the other
PR rtl-optimization/68841
* ifcvt.c (struct noce_if_info): Add orig_x field.
(bbs_ok_for_cmove_arith): Add to_rename parameter.
Don't record conflicts on to_rename if it's present.
Allow memory destinations in sets.
(noce_try_cmove_arith): Call bbs_ok_for_cmove_arith even on simple
blocks, passing orig_x to the checks.
(noce_process_if_block): Set if_info->orig_x appropriately.
* gcc.dg/pr68841.c: New test.
* gcc.c-torture/execute/pr68841.c: New test.
From-SVN: r232223