Make logical ops use a clobbered register instead of $1

From-SVN: r1195

6 files changed, 346 insertions, 81 deletions

diff --git a/gcc/config/mips/mips.c b/gcc/config/mips/mips.c
index c69abaa..08a6129 100644
--- a/gcc/config/mips/mips.c
+++ b/gcc/config/mips/mips.c
@@ -438,6 +438,23 @@ large_int (op, mode)
   return TRUE;
 }
 
+/* Return truth value of whether OP is an integer which can be loaded
+   with an lui instruction.  */
+
+int
+lui_int (op, mode)
+     rtx op;
+     enum machine_mode mode;
+{
+  if (GET_CODE (op) != CONST_INT)
+    return FALSE;
+
+  if ((INTVAL (op) & 0x0000ffff) == 0)		/* lui reg,value>>16 */
+    return TRUE;
+
+  return FALSE;
+}
+
 /* Return truth value of whether OP is a register or the constant 0.  */
 
 int
@@ -1049,12 +1066,7 @@ mips_move_1word (operands, insn, unsignedp)
 	    }
 
 	  else if (GP_REG_P (regno0))
-	    {
-	      if ((INTVAL (operands[1]) & 0x0000ffff) == 0)
-		ret = "lui\t%0,(%X1)>>16";
-	      else
-		ret = "li\t%0,%1";
-	    }
+	    ret = "li\t%0,%X1\t\t# %1";
 	}
 
       else if (code1 == CONST_DOUBLE && mode == SFmode)
@@ -3551,6 +3563,65 @@ mips_output_lineno (stream, line)
 }
 
 
+/* If defined, a C statement to be executed just prior to the
+   output of assembler code for INSN, to modify the extracted
+   operands so they will be output differently.
+
+   Here the argument OPVEC is the vector containing the operands
+   extracted from INSN, and NOPERANDS is the number of elements of
+   the vector which contain meaningful data for this insn.  The
+   contents of this vector are what will be used to convert the
+   insn template into assembler code, so you can change the
+   assembler output by changing the contents of the vector.
+
+   We use it to check if the current insn needs a nop in front of it
+   because of load delays, and also to update the delay slot
+   statistics.  */
+
+void
+final_prescan_insn (insn, opvec, noperands)
+     rtx insn;
+     rtx opvec[];
+     int noperands;
+{
+  if (dslots_number_nops > 0)
+    {
+      enum machine_mode mode = GET_MODE (mips_load_reg);
+      rtx pattern = PATTERN (insn);
+      int length = get_attr_length (insn);
+
+      /* Do we need to emit a NOP? */
+      if (length == 0
+	  || (mips_load_reg  != (rtx)0 && reg_mentioned_p (mips_load_reg,  pattern))
+	  || (mips_load_reg2 != (rtx)0 && reg_mentioned_p (mips_load_reg2, pattern))
+	  || (mips_load_reg3 != (rtx)0 && reg_mentioned_p (mips_load_reg3, pattern))
+	  || (mips_load_reg4 != (rtx)0 && reg_mentioned_p (mips_load_reg4, pattern)))
+	fputs ((set_noreorder) ? "\tnop\n" : "\t#nop\n", asm_out_file);
+
+      else
+	dslots_load_filled++;
+
+      while (--dslots_number_nops > 0)
+	fputs ((set_noreorder) ? "\tnop\n" : "\t#nop\n", asm_out_file);
+
+      mips_load_reg  = (rtx)0;
+      mips_load_reg2 = (rtx)0;
+      mips_load_reg3 = (rtx)0;
+      mips_load_reg4 = (rtx)0;
+
+      if (set_noreorder && --set_noreorder == 0)
+	fputs ("\t.set\treorder\n", asm_out_file);
+    }
+
+  if (TARGET_STATS)
+    {
+      enum rtx_code code = GET_CODE (insn);
+      if (code == JUMP_INSN || code == CALL_INSN)
+	dslots_jump_total++;
+    }
+}
+
+
 /* Output at beginning of assembler file.
    If we are optimizing to use the global pointer, create a temporary
    file to hold all of the text stuff, and write it out to the end.
@@ -4373,4 +4444,3 @@ null_epilogue ()
 
   return (compute_frame_size (get_frame_size ())) == 0;
 }
-
diff --git a/gcc/config/mips/mips.h b/gcc/config/mips/mips.h
index 87e2879..c0b0bef 100644
--- a/gcc/config/mips/mips.h
+++ b/gcc/config/mips/mips.h
@@ -125,6 +125,7 @@ extern unsigned long	compute_frame_size ();
 extern void		expand_block_move ();
 extern int		equality_op ();
 extern int		fcmp_op ();
+extern void		final_prescan_insn ();
 extern int		fpsw_register_operand ();
 extern struct rtx_def *	function_arg ();
 extern void		function_arg_advance ();
@@ -135,6 +136,7 @@ extern void		gen_conditional_branch ();
 extern struct rtx_def * gen_int_relational ();
 extern void		init_cumulative_args ();
 extern int		large_int ();
+extern int		lui_int ();
 extern int		md_register_operand ();
 extern int		mips_address_cost ();
 extern void		mips_asm_file_end ();
@@ -428,7 +430,7 @@ while (0)
 
 /* Print subsidiary information on the compiler version in use.  */
 
-#define MIPS_VERSION "[AL 1.1, MM 19]"
+#define MIPS_VERSION "[AL 1.1, MM 20]"
 
 #ifndef MACHINE_TYPE
 #define MACHINE_TYPE "BSD Mips"
@@ -2504,47 +2506,7 @@ while (0)
    statistics.  */
 
 #define FINAL_PRESCAN_INSN(INSN, OPVEC, NOPERANDS)			\
-do									\
-  {									\
-    if (dslots_number_nops > 0 && mips_load_reg != (rtx)0)		\
-      {									\
-	enum machine_mode mode = GET_MODE (mips_load_reg);		\
-	rtx pattern = PATTERN (INSN);					\
-									\
-	if (reg_mentioned_p (mips_load_reg, pattern)			\
-	    || (mips_load_reg2 != (rtx)0				\
-		&& reg_mentioned_p (mips_load_reg2, pattern))		\
-	    || (mips_load_reg3 != (rtx)0				\
-		&& reg_mentioned_p (mips_load_reg3, pattern))		\
-	    || (mips_load_reg4 != (rtx)0				\
-		&& reg_mentioned_p (mips_load_reg4, pattern))		\
-	    || get_attr_length (INSN) == 0)				\
-	  {								\
-	    fputs ((set_noreorder) ? "\tnop\n" : "\t#nop\n", asm_out_file); \
-	  }								\
-	else								\
-	  dslots_load_filled++;						\
-									\
-	while (--dslots_number_nops > 0)				\
-	  fputs ((set_noreorder) ? "\tnop\n" : "\t#nop\n", asm_out_file); \
-									\
-	mips_load_reg  = (rtx)0;					\
-	mips_load_reg2 = (rtx)0;					\
-	mips_load_reg3 = (rtx)0;					\
-	mips_load_reg4 = (rtx)0;					\
-									\
-	if (set_noreorder && --set_noreorder == 0)			\
-	  fputs ("\t.set\treorder\n", asm_out_file);			\
-      }									\
-									\
-    if (TARGET_STATS)							\
-      {									\
-	enum rtx_code code = GET_CODE (INSN);				\
-	if (code == JUMP_INSN || code == CALL_INSN)			\
-	  dslots_jump_total++;						\
-      }									\
-  }									\
-while (0)
+  final_prescan_insn (INSN, OPVEC, NOPERANDS)
 
 
 /* Tell final.c how to eliminate redundant test instructions.
@@ -3310,4 +3272,3 @@ while (0)
 #define MIPS_IS_STAB(sym) (((sym)->index & 0xFFF00) == CODE_MASK)
 #define MIPS_MARK_STAB(code) ((code)+CODE_MASK)
 #define MIPS_UNMARK_STAB(code) ((code)-CODE_MASK)
-
diff --git a/gcc/config/mips/mips.md b/gcc/config/mips/mips.md
index 00cae6d..730d624 100644
--- a/gcc/config/mips/mips.md
+++ b/gcc/config/mips/mips.md
@@ -1153,20 +1153,98 @@ move\\t%0,%z4\\n\\
 ;; the optimizer can fold things together, at the expense of not moving the
 ;; constant out of loops.
 
-(define_insn "andsi3"
-  [(set (match_operand:SI 0 "register_operand" "=d,d,?d,?d")
-	(and:SI (match_operand:SI 1 "arith32_operand" "%d,d,d,d")
-		(match_operand:SI 2 "arith32_operand" "d,K,I,M")))]
+(define_expand "andsi3"
+  [(set (match_operand:SI 0 "register_operand" "=d")
+	(and:SI (match_operand:SI 1 "arith32_operand" "dKIM")
+		(match_operand:SI 2 "arith32_operand" "dKIM")))]
+  ""
+  "
+{
+  extern rtx gen_andsi3_internal2 ();
+
+  /* Canonlicalize */
+  if (GET_CODE (operands[1]) == CONST_INT)
+    {
+      rtx temp;
+
+      if (GET_CODE (operands[2]) == CONST_INT)
+	{
+	  emit_move_insn (operands[0],
+			  gen_rtx (CONST_INT, VOIDmode,
+				   INTVAL (operands[1]) & INTVAL (operands[2])));
+	  DONE;
+	}
+
+      temp = operands[1];
+      operands[1] = operands[2];
+      operands[2] = temp;
+    }
+
+  if (GET_CODE (operands[2]) == CONST_INT && !SMALL_INT_UNSIGNED (operands[2]))
+    {
+      emit_insn (gen_andsi3_internal2 (operands[0],
+				       operands[1],
+				       operands[2],
+				       gen_reg_rtx (SImode)));
+      DONE;
+    }
+}")
+
+(define_insn "andsi3_internal1"
+  [(set (match_operand:SI 0 "register_operand" "=d,d")
+	(and:SI (match_operand:SI 1 "register_operand" "d,d")
+		(match_operand:SI 2 "uns_arith_operand" "d,K")))]
+  ""
+  "@
+   and\\t%0,%1,%2
+   andi\\t%0,%1,%x2"
+  [(set_attr "type"	"arith")
+   (set_attr "mode"	"SI")
+   (set_attr "length"	"1")])
+
+(define_insn "andsi3_internal2"
+  [(set (match_operand:SI 0 "register_operand" "=d,d,d,d")
+	(and:SI (match_operand:SI 1 "register_operand" "d,d,d,d")
+		(match_operand:SI 2 "arith32_operand" "d,K,I,M")))
+   (clobber (match_operand:SI 3 "register_operand" "=d,d,d,d"))]
   ""
   "@
    and\\t%0,%1,%2
    andi\\t%0,%1,%x2
-   %[li\\t%@,%X2\;and\\t%0,%1,%@%]
-   %[li\\t%@,%X2\;and\\t%0,%1,%@%]"
+   li\\t%3,%X2\\t\\t# %2\;and\\t%0,%1,%3
+   li\\t%3,%X2\\t\\t# %2\;and\\t%0,%1,%3"
   [(set_attr "type"	"arith,arith,multi,multi")
    (set_attr "mode"	"SI")
    (set_attr "length"	"1,1,2,3")])
 
+(define_split
+  [(set (match_operand:SI 0 "register_operand" "")
+	(and:SI (match_operand:SI 1 "register_operand" "")
+		(match_operand:SI 2 "lui_int" "")))
+   (clobber (match_operand:SI 3 "register_operand" ""))]
+  "reload_completed && !TARGET_DEBUG_D_MODE"
+
+  [(set (match_dup 3) (match_dup 2))
+   (set (match_dup 0) (and:SI (match_dup 1) (match_dup 3)))]
+  "")
+
+(define_split
+  [(set (match_operand:SI 0 "register_operand" "")
+	(and:SI (match_operand:SI 1 "register_operand" "")
+		(match_operand:SI 2 "large_int" "")))
+   (clobber (match_operand:SI 3 "register_operand" ""))]
+  "reload_completed && !TARGET_DEBUG_D_MODE"
+
+  [(set (match_dup 3) (match_dup 4))
+   (set (match_dup 3) (ior:SI (match_dup 3) (match_dup 5)))
+   (set (match_dup 0) (and:SI (match_dup 1) (match_dup 3)))]
+  "
+{
+  int val = INTVAL (operands[2]);
+  operands[4] = gen_rtx (CONST_INT, VOIDmode, val & 0xffff0000);
+  operands[5] = gen_rtx (CONST_INT, VOIDmode, val & 0x0000ffff);
+}")
+
 (define_insn "anddi3"
   [(set (match_operand:DI 0 "register_operand" "=d")
 	(and:DI (match_operand:DI 1 "register_operand" "d")
@@ -1190,20 +1268,98 @@ move\\t%0,%z4\\n\\
    (set (subreg:SI (match_dup 0) 1) (and:SI (subreg:SI (match_dup 1) 1) (subreg:SI (match_dup 2) 1)))]
   "")
 
-(define_insn "iorsi3"
-  [(set (match_operand:SI 0 "register_operand" "=d,d,?d,?d")
-	(ior:SI (match_operand:SI 1 "arith32_operand" "%d,d,d,d")
-		(match_operand:SI 2 "arith32_operand" "d,K,I,M")))]
+(define_expand "iorsi3"
+  [(set (match_operand:SI 0 "register_operand" "=d")
+	(ior:SI (match_operand:SI 1 "arith32_operand" "dKIM")
+		(match_operand:SI 2 "arith32_operand" "dKIM")))]
+  ""
+  "
+{
+  extern rtx gen_iorsi3_internal2 ();
+
+  /* Canonlicalize */
+  if (GET_CODE (operands[1]) == CONST_INT)
+    {
+      rtx temp;
+
+      if (GET_CODE (operands[2]) == CONST_INT)
+	{
+	  emit_move_insn (operands[0],
+			  gen_rtx (CONST_INT, VOIDmode,
+				   INTVAL (operands[1]) | INTVAL (operands[2])));
+	  DONE;
+	}
+
+      temp = operands[1];
+      operands[1] = operands[2];
+      operands[2] = temp;
+    }
+
+  if (GET_CODE (operands[2]) == CONST_INT && !SMALL_INT_UNSIGNED (operands[2]))
+    {
+      emit_insn (gen_iorsi3_internal2 (operands[0],
+				       operands[1],
+				       operands[2],
+				       gen_reg_rtx (SImode)));
+      DONE;
+    }
+}")
+
+(define_insn "iorsi3_internal1"
+  [(set (match_operand:SI 0 "register_operand" "=d,d")
+	(ior:SI (match_operand:SI 1 "register_operand" "d,d")
+		(match_operand:SI 2 "uns_arith_operand" "d,K")))]
+  ""
+  "@
+   or\\t%0,%1,%2
+   ori\\t%0,%1,%x2"
+  [(set_attr "type"	"arith")
+   (set_attr "mode"	"SI")
+   (set_attr "length"	"1")])
+
+(define_insn "iorsi3_internal2"
+  [(set (match_operand:SI 0 "register_operand" "=d,d,d,d")
+	(ior:SI (match_operand:SI 1 "register_operand" "d,d,d,d")
+		(match_operand:SI 2 "arith32_operand" "d,K,I,M")))
+   (clobber (match_operand:SI 3 "register_operand" "=d,d,d,d"))]
   ""
   "@
    or\\t%0,%1,%2
    ori\\t%0,%1,%x2
-   %[li\\t%@,%X2\;or\\t%0,%1,%@%]
-   %[li\\t%@,%X2\;or\\t%0,%1,%@%]"
+   li\\t%3,%X2\\t\\t# %2\;or\\t%0,%1,%3
+   li\\t%3,%X2\\t\\t# %2\;or\\t%0,%1,%3"
   [(set_attr "type"	"arith,arith,multi,multi")
    (set_attr "mode"	"SI")
    (set_attr "length"	"1,1,2,3")])
 
+(define_split
+  [(set (match_operand:SI 0 "register_operand" "")
+	(ior:SI (match_operand:SI 1 "register_operand" "")
+		(match_operand:SI 2 "lui_int" "")))
+   (clobber (match_operand:SI 3 "register_operand" ""))]
+  "reload_completed && !TARGET_DEBUG_D_MODE"
+
+  [(set (match_dup 3) (match_dup 2))
+   (set (match_dup 0) (ior:SI (match_dup 1) (match_dup 3)))]
+  "")
+
+(define_split
+  [(set (match_operand:SI 0 "register_operand" "")
+	(ior:SI (match_operand:SI 1 "register_operand" "")
+		(match_operand:SI 2 "large_int" "")))
+   (clobber (match_operand:SI 3 "register_operand" ""))]
+  "reload_completed && !TARGET_DEBUG_D_MODE"
+
+  [(set (match_dup 3) (match_dup 4))
+   (set (match_dup 3) (ior:SI (match_dup 3) (match_dup 5)))
+   (set (match_dup 0) (ior:SI (match_dup 1) (match_dup 3)))]
+  "
+{
+  int val = INTVAL (operands[2]);
+  operands[4] = gen_rtx (CONST_INT, VOIDmode, val & 0xffff0000);
+  operands[5] = gen_rtx (CONST_INT, VOIDmode, val & 0x0000ffff);
+}")
+
 (define_insn "iordi3"
   [(set (match_operand:DI 0 "register_operand" "=d")
 	(ior:DI (match_operand:DI 1 "register_operand" "d")
@@ -1227,20 +1383,99 @@ move\\t%0,%z4\\n\\
    (set (subreg:SI (match_dup 0) 1) (ior:SI (subreg:SI (match_dup 1) 1) (subreg:SI (match_dup 2) 1)))]
   "")
 
-(define_insn "xorsi3"
-  [(set (match_operand:SI 0 "register_operand" "=d,d,?d,?d")
-	(xor:SI (match_operand:SI 1 "arith32_operand" "%d,d,d,d")
-		(match_operand:SI 2 "arith32_operand" "d,K,I,M")))]
+(define_expand "xorsi3"
+  [(set (match_operand:SI 0 "register_operand" "=d")
+	(xor:SI (match_operand:SI 1 "arith32_operand" "dKIM")
+		(match_operand:SI 2 "arith32_operand" "dKIM")))]
+  ""
+  "
+{
+  extern rtx gen_xorsi3_internal2 ();
+
+  /* Canonlicalize */
+  if (GET_CODE (operands[1]) == CONST_INT)
+    {
+      rtx temp;
+
+      if (GET_CODE (operands[2]) == CONST_INT)
+	{
+	  emit_move_insn (operands[0],
+			  gen_rtx (CONST_INT, VOIDmode,
+				   INTVAL (operands[1]) ^ INTVAL (operands[2])));
+	  DONE;
+	}
+
+      temp = operands[1];
+      operands[1] = operands[2];
+      operands[2] = temp;
+    }
+
+  if (GET_CODE (operands[2]) == CONST_INT && !SMALL_INT_UNSIGNED (operands[2]))
+    {
+      emit_insn (gen_xorsi3_internal2 (operands[0],
+				       operands[1],
+				       operands[2],
+				       gen_reg_rtx (SImode)));
+      DONE;
+    }
+}")
+
+(define_insn "xorsi3_internal1"
+  [(set (match_operand:SI 0 "register_operand" "=d,d")
+	(xor:SI (match_operand:SI 1 "register_operand" "d,d")
+		(match_operand:SI 2 "uns_arith_operand" "d,K")))]
+  ""
+  "@
+   xor\\t%0,%1,%2
+   xori\\t%0,%1,%x2"
+  [(set_attr "type"	"arith")
+   (set_attr "mode"	"SI")
+   (set_attr "length"	"1")])
+
+(define_insn "xorsi3_internal2"
+  [(set (match_operand:SI 0 "register_operand" "=d,d,d,d")
+	(xor:SI (match_operand:SI 1 "register_operand" "d,d,d,d")
+		(match_operand:SI 2 "arith32_operand" "d,K,I,M")))
+   (clobber (match_operand:SI 3 "register_operand" "=d,d,d,d"))]
   ""
   "@
    xor\\t%0,%1,%2
    xori\\t%0,%1,%x2
-   %[li\\t%@,%X2\;xor\\t%0,%1,%@%]
-   %[li\\t%@,%X2\;xor\\t%0,%1,%@%]"
+   li\\t%3,%X2\\t\\t# %2\;xor\\t%0,%1,%3
+   li\\t%3,%X2\\t\\t# %2\;xor\\t%0,%1,%3"
   [(set_attr "type"	"arith,arith,multi,multi")
    (set_attr "mode"	"SI")
    (set_attr "length"	"1,1,2,3")])
 
+(define_split
+  [(set (match_operand:SI 0 "register_operand" "")
+	(xor:SI (match_operand:SI 1 "register_operand" "")
+		(match_operand:SI 2 "lui_int" "")))
+   (clobber (match_operand:SI 3 "register_operand" ""))]
+  "reload_completed && !TARGET_DEBUG_D_MODE"
+
+  [(set (match_dup 3) (match_dup 2))
+   (set (match_dup 0) (xor:SI (match_dup 1) (match_dup 3)))]
+  "")
+
+(define_split
+  [(set (match_operand:SI 0 "register_operand" "")
+	(xor:SI (match_operand:SI 1 "register_operand" "")
+		(match_operand:SI 2 "large_int" "")))
+   (clobber (match_operand:SI 3 "register_operand" ""))]
+  "reload_completed && !TARGET_DEBUG_D_MODE"
+
+  [(set (match_dup 3) (match_dup 4))
+   (set (match_dup 3) (ior:SI (match_dup 3) (match_dup 5)))
+   (set (match_dup 0) (xor:SI (match_dup 1) (match_dup 3)))]
+  "
+{
+  int val = INTVAL (operands[2]);
+  operands[4] = gen_rtx (CONST_INT, VOIDmode, val & 0xffff0000);
+  operands[5] = gen_rtx (CONST_INT, VOIDmode, val & 0x0000ffff);
+}")
+
+
 (define_insn "xordi3"
   [(set (match_operand:DI 0 "register_operand" "=d")
 	(xor:DI (match_operand:DI 1 "register_operand" "d")
@@ -3993,4 +4228,3 @@ move\\t%0,%z4\\n\\
 ;; eval: (modify-syntax-entry ?{ "(}")
 ;; eval: (modify-syntax-entry ?} "){")
 ;; End:
-
diff --git a/gcc/config/mips/x-mips b/gcc/config/mips/x-mips
index 5f9ad70..cede48d 100644
--- a/gcc/config/mips/x-mips
+++ b/gcc/config/mips/x-mips
@@ -5,12 +5,12 @@
 # being used in secondary stage builds).  We need to pass
 # the -Wf,-XNg1500 option so the compiler can compile the
 # G++ file cp-parse.c.  Otherwise it complains about
-# too many case statements.  Down with fixed size tables!
+# too many case statements.  The -Olimit is so the user
+# can use -O2.  Down with fixed size tables!
 
 CC		= $(OLDCC)
-OLDCC		= cc -Wf,-XNg1500
-
-X_CFLAGS	= -O1
+OPT		= -O1
+OLDCC		= cc -Wf,-XNg1500 -Olimit 3000 $(OPT)
 
 # The bison output files are machine-indep,
 # so different flags for a particular machine are not useful.
diff --git a/gcc/config/mips/x-sysv b/gcc/config/mips/x-sysv
index b3f864d..049ee82 100644
--- a/gcc/config/mips/x-sysv
+++ b/gcc/config/mips/x-sysv
@@ -5,12 +5,12 @@
 # being used in secondary stage builds).  We need to pass
 # the -Wf,-XNg1500 option so the compiler can compile the
 # G++ file cp-parse.c.  Otherwise it complains about
-# too many case statements.  Down with fixed size tables!
+# too many case statements.  -Olimit is so the user
+# can use -O2.  Down with fixed size tables!
 
 CC		= $(OLDCC)
-OLDCC		= cc -Wf,-XNg1500
-
-X_CFLAGS	= -O1
+OPT		= -O1
+OLDCC		= cc -Wf,-XNg1500 -Olimit 3000 $(OPT)
 
 # The bison output files are machine-indep,
 # so different flags for a particular machine are not useful.
diff --git a/gcc/config/mips/x-ultrix b/gcc/config/mips/x-ultrix
index 0498bb1..6e46f0e 100644
--- a/gcc/config/mips/x-ultrix
+++ b/gcc/config/mips/x-ultrix
@@ -5,12 +5,12 @@
 # being used in secondary stage builds).  We need to pass
 # the -Wf,-XNg1500 option so the compiler can compile the
 # G++ file cp-parse.c.  Otherwise it complains about
-# too many case statements.  Down with fixed size tables!
+# too many case statements.  -Olimit is so the user
+# can use -O2.  Down with fixed size tables!
 
 CC		= $(OLDCC)
-OLDCC		= cc -Wf,-XNg1500
-
-X_CFLAGS	= -O1
+OPT		= -O1
+OLDCC		= cc -Wf,-XNg1500 -Olimit 3000 $(OPT)
 
 # The bison output files are machine-indep,
 # so different flags for a particular machine are not useful.