re PR target/56347 (FAIL: gfortran.dg/integer_exponentiation_2.f90 -O2 execution test)

	PR target/56347
	* config/pa/pa.c (pa_conditional_register_usage): On HP-UX, mark
	registers %fr12 and %fr12R as call used.

From-SVN: r196123

gcc/ChangeLog

-2013-02-18  John David Anglin  <dave.anglin@nrc-cnrc.ca>
+2013-02-18  John David Anglin  <dave.anglin@nrc-cnrc.gc.ca>
+
+	PR target/56347
+	* config/pa/pa.c (pa_conditional_register_usage): On HP-UX, mark
+	registers %fr12 and %fr12R as call used.
 
 	PR target/56214
 	* config/pa/predicates.md (base14_operand): Except for BLKmode, QImode

gcc/config/pa/pa.c

@@ -10313,6 +10313,21 @@ pa_conditional_register_usage (void)
 {
   int i;
 
+  if (TARGET_HPUX)
+    {
+      /* Work around powf bug in libm.  */
+      if (TARGET_64BIT)
+	{
+	  /* Mark %fr12 as call used.  */
+	  call_used_regs[40] = 1;
+	}
+      else
+	{
+	  /* Mark %fr12 and %fr12R as call used.  */
+	  call_used_regs[48] = 1;
+	  call_used_regs[49] = 1;
+	}
+    }
   if (!TARGET_64BIT && !TARGET_PA_11)
     {
       for (i = 56; i <= FP_REG_LAST; i++)