avr-protos.h (avr_peep2_scratch_safe): Remove prototype.

	* config/avr/avr-protos.h (avr_peep2_scratch_safe): Remove prototype.
	* config/avr/avr.c (avr_peep2_scratch_safe): Remove.
	(avr_hard_regno_scratch_ok): New function.
	(TARGET_HARD_REGNO_SCRATCH_OK): Define.
	* config/avr/avr.md (all peepholes that request a scratch register):
	Remove avr_peep2_scratch_safe use.

From-SVN: r137725

gcc/ChangeLog

+2008-07-11  Anatoly Sokolov  <aesok@post.ru>	
+
+	* config/avr/avr-protos.h (avr_peep2_scratch_safe): Remove prototype.
+	* config/avr/avr.c (avr_peep2_scratch_safe): Remove.
+	(avr_hard_regno_scratch_ok): New function.
+	(TARGET_HARD_REGNO_SCRATCH_OK): Define.
+	* config/avr/avr.md (all peepholes that request a scratch register):
+	Remove avr_peep2_scratch_safe use.
+
 2008-07-11  Tom Tromey  <tromey@redhat.com>
 	    Ian Lance Taylor  <iant@google.com>
 

gcc/config/avr/avr-protos.h

@@ -122,7 +122,6 @@ extern RTX_CODE avr_normalize_condition (RTX_CODE condition);
 extern int compare_eq_p (rtx insn);
 extern void out_shift_with_cnt (const char *template, rtx insn,
 				rtx operands[], int *len, int t_len);
-extern int avr_peep2_scratch_safe (rtx reg_rtx);
 #endif /* RTX_CODE */
 
 #ifdef HAVE_MACHINE_MODES

gcc/config/avr/avr.c

@@ -85,6 +85,7 @@ static int avr_address_cost (rtx);
 static bool avr_return_in_memory (const_tree, const_tree);
 static struct machine_function * avr_init_machine_status (void);
 static rtx avr_builtin_setjmp_frame_value (void);
+static bool avr_hard_regno_scratch_ok (unsigned int);
 
 /* Allocate registers from r25 to r8 for parameters for function calls.  */
 #define FIRST_CUM_REG 26
@@ -335,6 +336,9 @@ int avr_case_values_threshold = 30000;
 #undef TARGET_BUILTIN_SETJMP_FRAME_VALUE
 #define TARGET_BUILTIN_SETJMP_FRAME_VALUE avr_builtin_setjmp_frame_value
 
+#undef TARGET_HARD_REGNO_SCRATCH_OK
+#define TARGET_HARD_REGNO_SCRATCH_OK avr_hard_regno_scratch_ok
+
 struct gcc_target targetm = TARGET_INITIALIZER;
 
 void
@@ -5902,27 +5906,20 @@ avr_output_addr_vec_elt (FILE *stream, int value)
     fprintf (stream, "\trjmp .L%d\n", value);
 }
 
-/* Returns 1 if SCRATCH are safe to be allocated as a scratch
+/* Returns true if SCRATCH are safe to be allocated as a scratch
    registers (for a define_peephole2) in the current function.  */
 
-int
-avr_peep2_scratch_safe (rtx scratch)
+bool
+avr_hard_regno_scratch_ok (unsigned int regno)
 {
-  if ((interrupt_function_p (current_function_decl)
-       || signal_function_p (current_function_decl))
-      && leaf_function_p ())
-    {
-      int first_reg = true_regnum (scratch);
-      int last_reg = first_reg + GET_MODE_SIZE (GET_MODE (scratch)) - 1;
-      int reg;
+  /* Interrupt functions can only use registers that have already been saved
+     by the prologue, even if they would normally be call-clobbered.  */
 
-      for (reg = first_reg; reg <= last_reg; reg++)
-	{
-	  if (!df_regs_ever_live_p (reg))
-	    return 0;
-	}
-    }
-  return 1;
+  if ((cfun->machine->is_interrupt || cfun->machine->is_signal)
+      && !df_regs_ever_live_p (regno))
+    return false;
+
+  return true;
 }
 
 /* Return nonzero if register OLD_REG can be renamed to register NEW_REG.  */

gcc/config/avr/avr.md

@@ -261,8 +261,7 @@
     && operands[1] != constm1_rtx)"
   [(parallel [(set (match_dup 0) (match_dup 1))
 	      (clobber (match_dup 2))])]
-  "if (!avr_peep2_scratch_safe (operands[2]))
-     FAIL;")
+  "")
 
 ;;============================================================================
 ;; move word (16 bit)
@@ -320,8 +319,7 @@
     && operands[1] != constm1_rtx)"
   [(parallel [(set (match_dup 0) (match_dup 1))
 	      (clobber (match_dup 2))])]
-  "if (!avr_peep2_scratch_safe (operands[2]))
-     FAIL;")
+  "")
 
 ;; '*' because it is not used in rtl generation, only in above peephole
 (define_insn "*reload_inhi"
@@ -397,8 +395,7 @@
     && operands[1] != constm1_rtx)"
   [(parallel [(set (match_dup 0) (match_dup 1))
 	      (clobber (match_dup 2))])]
-  "if (!avr_peep2_scratch_safe (operands[2]))
-     FAIL;")
+  "")
 
 ;; '*' because it is not used in rtl generation.
 (define_insn "*reload_insi"
@@ -1432,8 +1429,7 @@
   ""
   [(parallel [(set (match_dup 0) (ashift:HI (match_dup 1) (match_dup 2)))
 	      (clobber (match_dup 3))])]
-  "if (!avr_peep2_scratch_safe (operands[3]))
-     FAIL;")
+  "")
 
 (define_insn "*ashlhi3_const"
   [(set (match_operand:HI 0 "register_operand"            "=r,r,r,r,r")
@@ -1453,8 +1449,7 @@
   ""
   [(parallel [(set (match_dup 0) (ashift:SI (match_dup 1) (match_dup 2)))
 	      (clobber (match_dup 3))])]
-  "if (!avr_peep2_scratch_safe (operands[3]))
-     FAIL;")
+  "")
 
 (define_insn "*ashlsi3_const"
   [(set (match_operand:SI 0 "register_operand"            "=r,r,r,r")
@@ -1506,8 +1501,7 @@
   ""
   [(parallel [(set (match_dup 0) (ashiftrt:HI (match_dup 1) (match_dup 2)))
 	      (clobber (match_dup 3))])]
-  "if (!avr_peep2_scratch_safe (operands[3]))
-     FAIL;")
+  "")
 
 (define_insn "*ashrhi3_const"
   [(set (match_operand:HI 0 "register_operand"              "=r,r,r,r,r")
@@ -1527,8 +1521,7 @@
   ""
   [(parallel [(set (match_dup 0) (ashiftrt:SI (match_dup 1) (match_dup 2)))
 	      (clobber (match_dup 3))])]
-  "if (!avr_peep2_scratch_safe (operands[3]))
-     FAIL;")
+  "")
 
 (define_insn "*ashrsi3_const"
   [(set (match_operand:SI 0 "register_operand"              "=r,r,r,r")
@@ -1580,8 +1573,7 @@
   ""
   [(parallel [(set (match_dup 0) (lshiftrt:HI (match_dup 1) (match_dup 2)))
 	      (clobber (match_dup 3))])]
-  "if (!avr_peep2_scratch_safe (operands[3]))
-     FAIL;")
+  "")
 
 (define_insn "*lshrhi3_const"
   [(set (match_operand:HI 0 "register_operand"              "=r,r,r,r,r")
@@ -1601,8 +1593,7 @@
   ""
   [(parallel [(set (match_dup 0) (lshiftrt:SI (match_dup 1) (match_dup 2)))
 	      (clobber (match_dup 3))])]
-  "if (!avr_peep2_scratch_safe (operands[3]))
-     FAIL;")
+  "")
 
 (define_insn "*lshrsi3_const"
   [(set (match_operand:SI 0 "register_operand"              "=r,r,r,r")