[RS6000] powerpc64le -ffixed-cr2 -ffixed-cr3 -ffixed-cr4 ICE

gcc/
	PR target/70866
	* config/rs6000/rs6000.c (rs6000_stack_info): Don't set cr_save_p
	when cr2,3,4 are all fixed regs.
gcc/testsuite/
	* gcc.target/powerpc/pr70866.c: New.

From-SVN: r235851

gcc/ChangeLog

+2016-05-04  Alan Modra  <amodra@gmail.com>
+
+	PR target/70866
+	* config/rs6000/rs6000.c (rs6000_stack_info): Don't set cr_save_p
+	when cr2,3,4 are all fixed regs.
+
 2016-05-04  Bernd Schmidt  <bschmidt@redhat.com>
 
 	PR rtl-optimization/57193

gcc/config/rs6000/rs6000.c

@@ -23689,9 +23689,9 @@ rs6000_stack_info (void)
   info->calls_p = (!crtl->is_leaf || cfun->machine->ra_needs_full_frame);
 
   /* Determine if we need to save the condition code registers.  */
-  if (df_regs_ever_live_p (CR2_REGNO)
-      || df_regs_ever_live_p (CR3_REGNO)
-      || df_regs_ever_live_p (CR4_REGNO))
+  if (save_reg_p (CR2_REGNO)
+      || save_reg_p (CR3_REGNO)
+      || save_reg_p (CR4_REGNO))
     {
       info->cr_save_p = 1;
       if (DEFAULT_ABI == ABI_V4)

gcc/testsuite/ChangeLog

+2016-05-04  Alan Modra  <amodra@gmail.com>
+
+	* gcc.target/powerpc/pr70866.c: New.
+
 2016-05-03  Martin Sebor  <msebor@redhat.com>
 
 	PR c++/66561

gcc/testsuite/gcc.target/powerpc/pr70866.c

+/* { dg-do compile } */
+/* { dg-options "-ffixed-cr2 -ffixed-cr3 -ffixed-cr4" } */
+
+#define SET_CR(R,V) __asm__ __volatile__ ("mtcrf %0,%1" : : "n" (1<<(7-R)), "r" (V<<(4*(7-R))) : "cr" #R)
+
+void foo (void)
+{
+  SET_CR (2, 7);
+  SET_CR (3, 8);
+  SET_CR (4, 9);
+}