tree-optimization/112495 - alias versioning and address spaces

We are not correctly handling differing address spaces in dependence
analysis runtime alias check generation so refuse to do that.

	PR tree-optimization/112495
	* tree-data-ref.c (runtime_alias_check_p): Reject checks
	between different address spaces.

	* gcc.target/i386/pr112495.c: New testcase.

(cherry picked from commit 0f593c0521caab8cfac53514b1a5e7d0d0dd1932)

diff --git a/gcc/testsuite/gcc.target/i386/pr112495.c b/gcc/testsuite/gcc.target/i386/pr112495.c
new file mode 100644 (file)
index 0000000..21afbaa
--- /dev/null
+++ b/gcc/testsuite/gcc.target/i386/pr112495.c
@@ -0,0 +1,12 @@
+/* { dg-do compile } */
+/* { dg-options "-O3" } */
+
+typedef struct { int v; } T1;
+typedef struct { T1 v[32]; } T2;
+
+T1 s;
+T1 f1() { return s; }
+
+void f2(__seg_gs T2 *p, int n) {
+  for (int i = 0; i < n; ++i) p->v[i] = f1();
+}

diff --git a/gcc/tree-data-ref.c b/gcc/tree-data-ref.c
index d127aba87923ad02f779cf4970a2a5e4e41ae092..53c73bd5ba0617faf6a1d2f45845cc31f7051cfa 100644 (file)
--- a/gcc/tree-data-ref.c
+++ b/gcc/tree-data-ref.c
@@ -1642,6 +1642,13 @@ runtime_alias_check_p (ddr_p ddr, class loop *loop, bool speed_p)
                                   "runtime alias check not supported for"
                                   " outer loop.\n");
 
+  /* FORNOW: We don't support handling different address spaces.  */
+  if (TYPE_ADDR_SPACE (TREE_TYPE (TREE_TYPE (DR_BASE_ADDRESS (DDR_A (ddr)))))
+      != TYPE_ADDR_SPACE (TREE_TYPE (TREE_TYPE (DR_BASE_ADDRESS (DDR_B (ddr))))))
+    return opt_result::failure_at (DR_STMT (DDR_A (ddr)),
+                                  "runtime alias check between different "
+                                  "address spaces not supported.\n");
+
   return opt_result::success ();
 }