PR tree-optimization/93683 - ICE on calloc with unused return value in…

PR tree-optimization/93683 - ICE on calloc with unused return value in ao_ref_init_from_ptr_and_size

gcc/testsuite/ChangeLog:

	PR tree-optimization/93683
	* gcc.dg/tree-ssa/ssa-dse-39.c: New test.

gcc/ChangeLog:

	PR tree-optimization/93683
	* tree-ssa-alias.c (stmt_kills_ref_p): Avoid using LHS when not set.

gcc/ChangeLog

+2020-02-11  Martin Sebor  <msebor@redhat.com>
+
+	PR tree-optimization/93683
+	* tree-ssa-alias.c (stmt_kills_ref_p): Avoid using LHS when not set.
+
 2020-02-11  Michael Meissner  <meissner@linux.ibm.com>
 
 	* config/rs6000/predicates.md (cint34_operand): Rename the

gcc/testsuite/ChangeLog

+2020-02-11  Martin Sebor  <msebor@redhat.com>
+
+	PR tree-optimization/93683
+	* gcc.dg/tree-ssa/ssa-dse-39.c: New test.
+
 2020-02-11  Will Schmidt  <will_schmidt@vnet.ibm.com>
 
 	* lib/target-supports.exp (check_effective_target_ppc_ieee128_ok): New.

gcc/testsuite/gcc.dg/tree-ssa/ssa-dse-39.c

+/* PR tree-optimization/93683 - ICE on calloc with unused return value
+   in ao_ref_init_from_ptr_and_size
+   { dg-do compile }
+   { dg-options "-O2 -Wall -Wno-unused-result -fdump-tree-cddce1" } */
+
+void f0 (int *a)
+{
+  *a = 0;
+  __builtin_calloc (1, 1);
+}
+
+void f1 (int *a, unsigned n)
+{
+  *a = n;
+  __builtin_calloc (n, n);
+}
+
+/* { dg-final { scan-tree-dump-not "calloc" "cddce1" } } */

gcc/tree-ssa-alias.c

@@ -3265,6 +3265,8 @@ stmt_kills_ref_p (gimple *stmt, ao_ref *ref)
 		    return false;
 
 		  dest = gimple_call_lhs (stmt);
+		  if (!dest)
+		    return false;
 		  len = fold_build2 (MULT_EXPR, TREE_TYPE (arg0), arg0, arg1);
 		}
 	      else