re PR target/69129 (ICE in get_attr_got, at config/mips/mips.md:694 on mips-linux-gnu)

	PR target/69129
	PR target/69012
	* config/mips/mips.c (mips_compute_frame_info): Initialise
	args_size and hard_frame_pointer_offset fields of the frame
	structure before calling mips_global_pointer.

	PR target/69129
	* gcc.target/mips/pr69129.c: New.

From-SVN: r232674

4 files changed, 63 insertions, 8 deletions

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index fd386b9..e620e30 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,12 @@
+2016-01-21  Bernd Enlinger  <bernd.edlinger@hotmail.de>
+	    Nick Clifton  <nickc@redhat.com>
+
+	PR target/69129
+	PR target/69012
+	* config/mips/mips.c (mips_compute_frame_info): Initialise
+	args_size and hard_frame_pointer_offset fields of the frame
+	structure before calling mips_global_pointer.
+
 2016-01-21  David Edelsohn  <dje.gcc@gmail.com>
 
 	* configure.ac (gcc_cv_as_dwloc): Test support for debug frame section
diff --git a/gcc/config/mips/mips.c b/gcc/config/mips/mips.c
index ea18ad6..dd54d6a 100644
--- a/gcc/config/mips/mips.c
+++ b/gcc/config/mips/mips.c
@@ -10347,8 +10347,6 @@ mips_compute_frame_info (void)
   memset (frame, 0, sizeof (*frame));
   size = get_frame_size ();
 
-  cfun->machine->global_pointer = mips_global_pointer ();
-
   /* The first two blocks contain the outgoing argument area and the $gp save
      slot.  This area isn't needed in leaf functions.  We can also skip it
      if we know that none of the called functions will use this space.
@@ -10375,6 +10373,26 @@ mips_compute_frame_info (void)
       frame->args_size = crtl->outgoing_args_size;
       frame->cprestore_size = MIPS_GP_SAVE_AREA_SIZE;
     }
+
+  /* MIPS16 code offsets the frame pointer by the size of the outgoing
+     arguments.  This tends to increase the chances of using unextended
+     instructions for local variables and incoming arguments.  */
+  if (TARGET_MIPS16)
+    frame->hard_frame_pointer_offset = frame->args_size;
+
+  /* PR 69129 / 69012: Beware of a possible race condition.  mips_global_pointer
+     might call mips_cfun_has_inflexible_gp_ref_p which in turn can call
+     mips_find_gp_ref which will iterate over the current insn sequence.
+     If any of these insns use the cprestore_save_slot_operand or
+     cprestore_load_slot_operand predicates in order to be recognised then
+     they will call mips_cprestore_address_p which calls
+     mips_get_cprestore_base_and_offset which expects the frame information
+     to be filled in...  In fact mips_get_cprestore_base_and_offset only
+     needs the args_size and hard_frame_pointer_offset fields to be filled
+     in, which is why the global_pointer field is initialised here and not
+     earlier.  */
+  cfun->machine->global_pointer = mips_global_pointer ();
+
   offset = frame->args_size + frame->cprestore_size;
 
   /* Move above the local variables.  */
@@ -10520,12 +10538,6 @@ mips_compute_frame_info (void)
     frame->acc_save_offset = frame->acc_sp_offset - offset;
   if (frame->num_cop0_regs > 0)
     frame->cop0_save_offset = frame->cop0_sp_offset - offset;
-
-  /* MIPS16 code offsets the frame pointer by the size of the outgoing
-     arguments.  This tends to increase the chances of using unextended
-     instructions for local variables and incoming arguments.  */
-  if (TARGET_MIPS16)
-    frame->hard_frame_pointer_offset = frame->args_size;
 }
 
 /* Return the style of GP load sequence that is being used for the
diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog
index 25b72d7..08aafd1 100644
--- a/gcc/testsuite/ChangeLog
+++ b/gcc/testsuite/ChangeLog
@@ -1,3 +1,8 @@
+2016-01-21  Nick Clifton  <nickc@redhat.com>
+
+	PR target/69129
+	* gcc.target/mips/pr69129.c: New.
+
 2016-01-21  Paolo Carlini  <paolo.carlini@oracle.com>
 
 	PR c++/58046
diff --git a/gcc/testsuite/gcc.target/mips/pr69129.c b/gcc/testsuite/gcc.target/mips/pr69129.c
new file mode 100644
index 0000000..186582f
--- /dev/null
+++ b/gcc/testsuite/gcc.target/mips/pr69129.c
@@ -0,0 +1,29 @@
+_Noreturn void fn1 (int) __attribute__((__visibility__("hidden")));
+
+void
+fn2 (void *p1)
+{
+  int a[7];
+  float *b;
+  int c, n;
+
+  if (c != p1) /* { dg-warning "comparison between pointer and integer" } */
+    fn1 (1);
+
+  n = 0;
+  for (; c; n++)
+    {
+      int d;
+      if (a[n] != d)
+	fn1(n);
+    }
+
+  b = p1;
+
+  while (1)
+    {
+      *b = 3.40282347e38f;
+      if (a[0])
+	return;
+    }
+}