openwrt_chaos_calmer/toolchain/gcc/patches/4.8-linaro/951-arm_bug_58595.patch

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=58595

--- /dev/null
+++ b/gcc/testsuite/gcc.dg/tls/pr58595.c
@@ -0,0 +1,28 @@
+/* PR target/58595 */
+/* { dg-do run } */
+/* { dg-options "-O2" } */
+/* { dg-additional-options "-fpic" { target fpic } } */
+/* { dg-require-effective-target tls } */
+/* { dg-require-effective-target sync_int_long } */
+
+struct S { unsigned long a, b; };
+__thread struct S s;
+void bar (unsigned long *);
+
+__attribute__((noinline)) void
+foo (void)
+{
+  int i;
+  for (i = 0; i < 10; i++)
+    __sync_fetch_and_add (&s.b, 1L);
+}
+
+int
+main ()
+{
+  s.b = 12;
+  foo ();
+  if (s.b != 22)
+    __builtin_abort ();
+  return 0;
+}
--- a/gcc/config/arm/arm.c
+++ b/gcc/config/arm/arm.c
@@ -231,7 +231,6 @@ static tree arm_gimplify_va_arg_expr (tr
 static void arm_option_override (void);
 static unsigned HOST_WIDE_INT arm_shift_truncation_mask (enum machine_mode);
 static bool arm_cannot_copy_insn_p (rtx);
-static bool arm_tls_symbol_p (rtx x);
 static int arm_issue_rate (void);
 static void arm_output_dwarf_dtprel (FILE *, int, rtx) ATTRIBUTE_UNUSED;
 static bool arm_output_addr_const_extra (FILE *, rtx);
@@ -6665,6 +6664,32 @@ legitimize_tls_address (rtx x, rtx reg)
 rtx
 arm_legitimize_address (rtx x, rtx orig_x, enum machine_mode mode)
 {
+  if (arm_tls_referenced_p (x))
+    {
+      rtx addend = NULL;
+
+      if (GET_CODE (x) == CONST && GET_CODE (XEXP (x, 0)) == PLUS)
+	{
+	  addend = XEXP (XEXP (x, 0), 1);
+	  x = XEXP (XEXP (x, 0), 0);
+	}
+
+      if (GET_CODE (x) != SYMBOL_REF)
+	return x;
+
+      gcc_assert (SYMBOL_REF_TLS_MODEL (x) != 0);
+
+      x = legitimize_tls_address (x, NULL_RTX);
+
+      if (addend)
+	{
+	  x = gen_rtx_PLUS (SImode, x, addend);
+	  orig_x = x;
+	}
+      else
+	return x;
+    }
+
   if (!TARGET_ARM)
     {
       /* TODO: legitimize_address for Thumb2.  */
@@ -6673,9 +6698,6 @@ arm_legitimize_address (rtx x, rtx orig_
       return thumb_legitimize_address (x, orig_x, mode);
     }
 
-  if (arm_tls_symbol_p (x))
-    return legitimize_tls_address (x, NULL_RTX);
-
   if (GET_CODE (x) == PLUS)
     {
       rtx xop0 = XEXP (x, 0);
@@ -6787,9 +6809,6 @@ arm_legitimize_address (rtx x, rtx orig_
 rtx
 thumb_legitimize_address (rtx x, rtx orig_x, enum machine_mode mode)
 {
-  if (arm_tls_symbol_p (x))
-    return legitimize_tls_address (x, NULL_RTX);
-
   if (GET_CODE (x) == PLUS
       && CONST_INT_P (XEXP (x, 1))
       && (INTVAL (XEXP (x, 1)) >= 32 * GET_MODE_SIZE (mode)
@@ -7080,20 +7099,6 @@ thumb_legitimize_reload_address (rtx *x_
 
 /* Test for various thread-local symbols.  */
 
-/* Return TRUE if X is a thread-local symbol.  */
-
-static bool
-arm_tls_symbol_p (rtx x)
-{
-  if (! TARGET_HAVE_TLS)
-    return false;
-
-  if (GET_CODE (x) != SYMBOL_REF)
-    return false;
-
-  return SYMBOL_REF_TLS_MODEL (x) != 0;
-}
-
 /* Helper for arm_tls_referenced_p.  */
 
 static int