re PR rtl-optimization/46226 (asm goto may leave stack pointer invalid)

PR rtl-opt/46226
* stmt.c (expand_asm_operands): Call do_pending_stack_adjust
for asm goto.

From-SVN: r166067

gcc/ChangeLog

+2010-10-29  Richard Henderson  <rth@redhat.com>
+
+	PR rtl-opt/46226
+	* stmt.c (expand_asm_operands): Call do_pending_stack_adjust
+	for asm goto.
+
 2010-10-29  Paul Koning  <ni1d@arrl.net>
 
 	* config/pdp11/pdp11.c (output_move_quad): Fix ICE for CPU

gcc/stmt.c

@@ -776,6 +776,10 @@ expand_asm_operands (tree string, tree outputs, tree inputs,
 
   /* Second pass evaluates arguments.  */
 
+  /* Make sure stack is consistent for asm goto.  */
+  if (nlabels > 0)
+    do_pending_stack_adjust ();
+
   ninout = 0;
   for (i = 0, tail = outputs; tail; tail = TREE_CHAIN (tail), i++)
     {

gcc/testsuite/gcc.dg/pr46226.c

+/* { dg-do run } */
+/* { dg-options "-Os -fomit-frame-pointer" } */
+/* { dg-options "-Os -fomit-frame-pointer -mno-accumulate-outgoing-args -fno-asynchronous-unwind-tables" { target { i?86-*-* x86_64-*-* } } } */
+
+extern void abort(void);
+
+static void *p[2];
+
+void __attribute__((noinline))
+g(int x, ...)
+{
+  asm volatile ("" : : "g"(x));
+}
+
+void __attribute__((noinline))
+f(int x)
+{
+  p[0] = __builtin_return_address (0);
+  if (x == 0)
+    g(0);
+  g(1, 2, 3, 4, 5, 6, 7);
+
+  asm goto ("jmp %l0" : : : : label);
+  abort ();
+
+ label:
+  p[1] = __builtin_return_address (0);
+}
+
+int main()
+{
+  f(1);
+  if (p[0] != p[1])
+    abort ();
+  return 0;
+}