[gcc r11-9333] lim: Reset flow sensitive info even for pointers [PR103192]

[gcc r11-9333] lim: Reset flow sensitive info even for pointers [PR103192]

[Jakub Jelinek]

https://gcc.gnu.org/g:9ec84b35640aa06de5b2108deb30a3501342fbaf

commit r11-9333-g9ec84b35640aa06de5b2108deb30a3501342fbaf
Author: Jakub Jelinek <jakub@redhat.com>
Date:   Wed Nov 17 14:18:42 2021 +0100

    lim: Reset flow sensitive info even for pointers [PR103192]
    
    Since 2014 is lim clearing SSA_NAME_RANGE_INFO for integral SSA_NAMEs
    if moving them from conditional contexts inside of a loop into unconditional
    before the loop, but as the miscompilation of gimplify.c shows, we need to
    treat pointers the same, even for them we need to reset whether the pointer
    can/can't be null or the recorded pointer alignment.
    
    This fixes
    -FAIL: libgomp.c/../libgomp.c-c++-common/target-in-reduction-2.c (internal compiler error)
    -FAIL: libgomp.c/../libgomp.c-c++-common/target-in-reduction-2.c (test for excess errors)
    -UNRESOLVED: libgomp.c/../libgomp.c-c++-common/target-in-reduction-2.c compilation failed to produce executable
    -FAIL: libgomp.c++/../libgomp.c-c++-common/target-in-reduction-2.c (internal compiler error)
    -FAIL: libgomp.c++/../libgomp.c-c++-common/target-in-reduction-2.c (test for excess errors)
    -UNRESOLVED: libgomp.c++/../libgomp.c-c++-common/target-in-reduction-2.c compilation failed to produce executable
    -FAIL: libgomp.c++/target-in-reduction-2.C (internal compiler error)
    -FAIL: libgomp.c++/target-in-reduction-2.C (test for excess errors)
    -UNRESOLVED: libgomp.c++/target-in-reduction-2.C compilation failed to produce executable
    on both x86_64 and i686.
    
    2021-11-17  Jakub Jelinek  <jakub@redhat.com>
    
            PR tree-optimization/103192
            * tree-ssa-loop-im.c (move_computations_worker): Use
            reset_flow_sensitive_info instead of manually clearing
            SSA_NAME_RANGE_INFO and do it for all SSA_NAMEs, not just ones
            with integral types.
    
    (cherry picked from commit 077425c890927eefacb765ab5236060de9859e82)

Diff:
---
 gcc/tree-ssa-loop-im.c | 18 +++++-------------
 1 file changed, 5 insertions(+), 13 deletions(-)

diff --git a/gcc/tree-ssa-loop-im.c b/gcc/tree-ssa-loop-im.c
index 7de47edbcb3..8b1b1b2bede 100644
--- a/gcc/tree-ssa-loop-im.c
+++ b/gcc/tree-ssa-loop-im.c
@@ -1176,14 +1176,10 @@ move_computations_worker (basic_block bb)
 					  COND_EXPR, t, arg0, arg1);
 	  todo |= TODO_cleanup_cfg;
 	}
-      if (INTEGRAL_TYPE_P (TREE_TYPE (gimple_assign_lhs (new_stmt)))
-	  && (!ALWAYS_EXECUTED_IN (bb)
-	      || (ALWAYS_EXECUTED_IN (bb) != level
-		  && !flow_loop_nested_p (ALWAYS_EXECUTED_IN (bb), level))))
-	{
-	  tree lhs = gimple_assign_lhs (new_stmt);
-	  SSA_NAME_RANGE_INFO (lhs) = NULL;
-	}
+      if (!ALWAYS_EXECUTED_IN (bb)
+	  || (ALWAYS_EXECUTED_IN (bb) != level
+	      && !flow_loop_nested_p (ALWAYS_EXECUTED_IN (bb), level)))
+	reset_flow_sensitive_info (gimple_assign_lhs (new_stmt));
       gsi_insert_on_edge (loop_preheader_edge (level), new_stmt);
       remove_phi_node (&bsi, false);
     }
@@ -1246,14 +1242,10 @@ move_computations_worker (basic_block bb)
       gsi_remove (&bsi, false);
       if (gimple_has_lhs (stmt)
 	  && TREE_CODE (gimple_get_lhs (stmt)) == SSA_NAME
-	  && INTEGRAL_TYPE_P (TREE_TYPE (gimple_get_lhs (stmt)))
 	  && (!ALWAYS_EXECUTED_IN (bb)
 	      || !(ALWAYS_EXECUTED_IN (bb) == level
 		   || flow_loop_nested_p (ALWAYS_EXECUTED_IN (bb), level))))
-	{
-	  tree lhs = gimple_get_lhs (stmt);
-	  SSA_NAME_RANGE_INFO (lhs) = NULL;
-	}
+	reset_flow_sensitive_info (gimple_get_lhs (stmt));
       /* In case this is a stmt that is not unconditionally executed
          when the target loop header is executed and the stmt may
 	 invoke undefined integer or pointer overflow rewrite it to