re PR rtl-optimization/66891 (ICE in expand_call, at calls.c:3407)

	PR rtl-optimization/66891
	* calls.c (expand_call): Wrap precompute_register_parameters with
	NO_DEFER_POP/OK_DEFER_POP to prevent deferred pops.

testsuite/ChangeLog:

	PR target/66891
	* gcc.target/i386/pr66891.c: New test.

From-SVN: r225918

gcc/ChangeLog

+2015-07-17  Uros Bizjak  <ubizjak@gmail.com>
+
+	PR rtl-optimization/66891
+	* calls.c (expand_call): Wrap precompute_register_parameters with
+	NO_DEFER_POP/OK_DEFER_POP to prevent deferred pops.
+
 2015-07-16  Nathan Sidwell  <nathan@codesourcery.com>
 
 	* config/nvptx/mkoffload.c (process): Constify mapping variables.

gcc/calls.c

@@ -3144,6 +3144,10 @@ expand_call (tree exp, rtx target, int ignore)
 
       compute_argument_addresses (args, argblock, num_actuals);
 
+      /* Stack is properly aligned, pops can't safely be deferred during
+	 the evaluation of the arguments.  */
+      NO_DEFER_POP;
+
       /* Precompute all register parameters.  It isn't safe to compute
 	 anything once we have started filling any specific hard regs.
 	 TLS symbols sometimes need a call to resolve.  Precompute
@@ -3151,6 +3155,8 @@ expand_call (tree exp, rtx target, int ignore)
 	 to avoid unaligned stack in the called function.  */
       precompute_register_parameters (num_actuals, args, &reg_parm_seen);
 
+      OK_DEFER_POP;
+
       /* Perform stack alignment before the first push (the last arg).  */
       if (argblock == 0
           && adjusted_args_size.constant > reg_parm_stack_space

gcc/testsuite/ChangeLog

+2015-07-17  Uros Bizjak  <ubizjak@gmail.com>
+
+	PR target/66891
+	* gcc.target/i386/pr66891.c: New test.
+
 2015-07-16  Kyrylo Tkachov  <kyrylo.tkachov@arm.com>
 
 	* gcc.target/arm/no-volatile-in-it.c: Skip if -mcpu is overriden.

gcc/testsuite/gcc.target/i386/pr66891.c

+/* { dg-do compile { target ia32 } } */
+/* { dg-options "-O2" } */
+
+__attribute__((__stdcall__)) void fn1();
+
+int a;
+
+static void fn2() {
+  for (;;)
+    ;
+}
+
+void fn3() {
+  fn1(0);
+  fn2(a == 0);
+}