tree-ssa-dse.c (compute_trims): Handle case where the reference's type does not have...

	* tree-ssa-dse.c (compute_trims): Handle case where the reference's
	type does not have a TYPE_SIZE_UNIT.

	* gcc.c-torture/compile/dse.c: New test.

From-SVN: r263896

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index ac46b74..a8ab835 100644 (file)
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,8 @@
+2018-08-27  Jeff Law  <law@redhat.com>
+
+       * tree-ssa-dse.c (compute_trims): Handle case where the reference's
+       type does not have a TYPE_SIZE_UNIT.
+
 2018-08-27  Steve Ellcey  <sellcey@cavium.com>
 
        * config/aarch64/aarch64-speculation.cc: Replace include of cfg.h

diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog
index 824372c..6410f46 100644 (file)
--- a/gcc/testsuite/ChangeLog
+++ b/gcc/testsuite/ChangeLog
@@ -1,3 +1,7 @@
+2018-08-27  Jeff Law  <law@redhat.com>
+
+       * gcc.c-torture/compile/dse.c: New test.
+
 2018-08-27  Jakub Jelinek  <jakub@redhat.com>
 
        PR c++/86993

diff --git a/gcc/testsuite/gcc.c-torture/compile/dse.c b/gcc/testsuite/gcc.c-torture/compile/dse.c
new file mode 100644 (file)
index 0000000..908e650
--- /dev/null
+++ b/gcc/testsuite/gcc.c-torture/compile/dse.c
@@ -0,0 +1,19 @@
+typedef unsigned long microblaze_reg_t;
+struct pt_regs
+{
+  microblaze_reg_t msr;
+  int pt_mode;
+};
+struct task_struct
+{
+  void *stack;
+};
+int
+copy_thread (struct task_struct *p)
+{
+  struct pt_regs *childregs =
+    (((struct pt_regs *) ((1 << 13) + ((void *) (p)->stack))) - 1);
+  memset (childregs, 0, sizeof (struct pt_regs));
+  childregs->pt_mode = 1;
+}
+

diff --git a/gcc/tree-ssa-dse.c b/gcc/tree-ssa-dse.c
index 016aa6c..bddbbe8 100644 (file)
--- a/gcc/tree-ssa-dse.c
+++ b/gcc/tree-ssa-dse.c
@@ -252,6 +252,7 @@ compute_trims (ao_ref *ref, sbitmap live, int *trim_head, int *trim_tail,
       /* But don't trim away out of bounds accesses, as this defeats
         proper warnings.  */
       if (*trim_tail
+         && TYPE_SIZE_UNIT (TREE_TYPE (ref->base))
          && compare_tree_int (TYPE_SIZE_UNIT (TREE_TYPE (ref->base)),
                               last_orig) <= 0)
        *trim_tail = 0;