[Bug rtl-optimization/69606] [5/6 Regression] wrong code at -Os and above on x86_64-linux-gnu

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69606

--- Comment #4 from Richard Biener <rguenth at gcc dot gnu.org> ---
Testing

Index: gcc/tree-ssa-math-opts.c
===================================================================
*** gcc/tree-ssa-math-opts.c    (revision 233067)
--- gcc/tree-ssa-math-opts.c    (working copy)
*************** bswap_replace (gimple *cur_stmt, gimple
*** 2622,2627 ****
--- 2622,2629 ----
        /* Move cur_stmt just before  one of the load of the original
         to ensure it has the same VUSE.  See PR61517 for what could
         go wrong.  */
+       if (gimple_bb (cur_stmt) != gimple_bb (src_stmt))
+       reset_flow_sensitive_info (gimple_assign_lhs (cur_stmt));
        gsi_move_before (&gsi, &gsi_ins);
        gsi = gsi_for_stmt (cur_stmt);