[Bug ipa/93385] [10 Regression] wrong code with u128 modulo at -O2 -fno-dce -fno-ipa-cp -fno-tree-dce

[jamborm at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93385

--- Comment #11 from Martin Jambor <jamborm at gcc dot gnu.org> ---
I'm going to test a patch that basically does the following (plus moving
push_cfun a bit):

diff --git a/gcc/ipa-sra.c b/gcc/ipa-sra.c
index 31de527d111..e18dc6958dc 100644
--- a/gcc/ipa-sra.c
+++ b/gcc/ipa-sra.c
@@ -862,6 +862,14 @@ isra_track_scalar_value_uses (cgraph_node *node, tree
name, int parm_num,
       else if ((is_gimple_assign (stmt) && !gimple_has_volatile_ops (stmt))
               || gimple_code (stmt) == GIMPLE_PHI)
        {
+         if (!flag_tree_dce)
+           {
+             /* We depend on DCE to clean up statements that we discover to be
+                unnecessary.  */
+             res = -1;
+             BREAK_FROM_IMM_USE_STMT (imm_iter);
+           }
+         
          tree lhs;
          if (gimple_code (stmt) == GIMPLE_PHI)
            lhs = gimple_phi_result (stmt);