re PR rtl-optimization/22472 (testsuite failure gcc.c-torture/compile/930621-1.c…

re PR rtl-optimization/22472 (testsuite failure gcc.c-torture/compile/930621-1.c -O3 -funroll-loops)

	PR rtl-optimization/22472
	* config/pa/pa.h (HARD_REGNO_RENAME_OK): Define.

From-SVN: r102405

gcc/ChangeLog

+2005-07-26  Steve Ellcey  <sje@cup.hp.com>
+
+	PR rtl-optimization/22472
+	* config/pa/pa.h (HARD_REGNO_RENAME_OK): Define.
+
 2005-07-26  Steven Bosscher  <stevenb@suse.de>
 
 	PR tree-optimization/22504

gcc/config/pa/pa.h

@@ -358,6 +358,12 @@ typedef struct machine_function GTY(())
 #define FRAME_POINTER_REQUIRED \
   (current_function_calls_alloca)
 
+/* Don't allow hard registers to be renamed into r2 unless r2
+   is already live or already being saved (due to eh).  */
+
+#define HARD_REGNO_RENAME_OK(OLD_REG, NEW_REG) \
+  ((NEW_REG) != 2 || regs_ever_live[2] || current_function_calls_eh_return)
+
 /* C statement to store the difference between the frame pointer
    and the stack pointer values immediately after the function prologue.