From: Richard Kenner <kenner@gcc.gnu.org>
Date: Tue, 10 Dec 1996 22:13:04 +0000 (-0500)
Subject: (add[hs]i3): Only use two addq.w or subq.w instructions when...
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=b8aa7986909d7752a29cfd612c1fb6d9bfb5f571;p=gcc.git

(add[hs]i3): Only use two addq.w or subq.w instructions when...

(add[hs]i3): Only use two addq.w or subq.w instructions
when adding or subtracting constants 8 < N < 16 on TARGET_CPU32.
Use lea instead of add.w when adding 16 bit constants to address
registers on all but TARGET_68040.

From-SVN: r13265
---

diff --git a/gcc/config/m68k/m68k.md b/gcc/config/m68k/m68k.md
index 01dde67ec47..61e4a663e9c 100644
--- a/gcc/config/m68k/m68k.md
+++ b/gcc/config/m68k/m68k.md
@@ -789,7 +789,24 @@
   "*
 {
   if (ADDRESS_REG_P (operands[0]))
-    return \"sub%.l %0,%0\";
+    {
+      /* On the '040, 'subl an,an' takes 2 clocks while lea takes only 1 */
+      if (!TARGET_68040 && !TARGET_68060)
+	return \"sub%.l %0,%0\";
+      else
+	{
+#ifdef MOTOROLA
+#ifdef SGS
+	  /* Many SGS assemblers croak on size specifiers for constants. */
+	  return \"lea 0,%0\";
+#else
+	  return \"lea 0.w,%0\";
+#endif
+#else
+	  return \"lea 0:w,%0\";
+#endif
+	}
+    }
   /* moveq is faster on the 68000.  */
   if (DATA_REG_P (operands[0]) && (!TARGET_68020 && !TARGET_5200))
 #if defined(MOTOROLA) && !defined(CRDS)
@@ -2149,11 +2166,10 @@
 		  ? \"subq%.w %2,%0\"
 		  : \"subq%.l %2,%0\");
 	}
-      /* On the 68020 it is faster to use two addqw instructions to
+      /* On the CPU32 it is faster to use two addqw instructions to
 	 add a small integer (8 < N <= 16) to an address register.
 	 Likewise for subqw. */
-      if (TARGET_68020 && !TARGET_68040 && !TARGET_68060 
-          && ADDRESS_REG_P (operands[0]))
+      if (TARGET_CPU32 && ADDRESS_REG_P (operands[0]))
 	{
 	  if (INTVAL (operands[2]) > 8
 	      && INTVAL (operands[2]) <= 16)
@@ -2175,7 +2191,7 @@
 	  && INTVAL (operands[2]) >= -0x8000
 	  && INTVAL (operands[2]) < 0x8000)
 	{
-	  if (!TARGET_5200)
+	  if (TARGET_68040)
 	    return \"add%.w %2,%0\";
 	  else
 #ifdef MOTOROLA  
@@ -2203,9 +2219,9 @@
   "!TARGET_5200"
   "*
 {
-#ifndef NO_ADDSUB_Q
   if (GET_CODE (operands[2]) == CONST_INT)
     {
+#ifndef NO_ADDSUB_Q
       /* If the constant would be a negative number when interpreted as
 	 HImode, make it negative.  This is usually, but not always, done
 	 elsewhere in the compiler.  First check for constants out of range,
@@ -2225,11 +2241,10 @@
 			         - INTVAL (operands[2]));
 	  return \"subq%.w %2,%0\";
 	}
-      /* On the 68020 it is faster to use two addqw instructions to
+      /* On the CPU32 it is faster to use two addqw instructions to
 	 add a small integer (8 < N <= 16) to an address register.  
 	 Likewise for subqw. */
-      if (TARGET_68020 && !TARGET_68040 && !TARGET_68060 
-          && ADDRESS_REG_P (operands[0]))
+      if (TARGET_CPU32 && ADDRESS_REG_P (operands[0]))
 	{
 	  if (INTVAL (operands[2]) > 8
 	      && INTVAL (operands[2]) <= 16)
@@ -2246,8 +2261,14 @@
 	      return \"subq%.w %#8,%0\;subq%.w %2,%0\";
 	    }
 	}
-    }
 #endif
+      if (ADDRESS_REG_P (operands[0]) && !TARGET_68040)
+#ifdef MOTOROLA  
+	    return \"lea (%c2,%0),%0\";
+#else
+	    return \"lea %0@(%c2),%0\";
+#endif
+    }
   return \"add%.w %2,%0\";
 }")
 
@@ -2264,9 +2285,9 @@
   "!TARGET_5200"
   "*
 {
-#ifndef NO_ADDSUB_Q
   if (GET_CODE (operands[1]) == CONST_INT)
     {
+#ifndef NO_ADDSUB_Q
       /* If the constant would be a negative number when interpreted as
 	 HImode, make it negative.  This is usually, but not always, done
 	 elsewhere in the compiler.  First check for constants out of range,
@@ -2286,11 +2307,10 @@
 			         - INTVAL (operands[1]));
 	  return \"subq%.w %1,%0\";
 	}
-      /* On the 68020 it is faster to use two addqw instructions to
+      /* On the CPU32 it is faster to use two addqw instructions to
 	 add a small integer (8 < N <= 16) to an address register. 
 	 Likewise for subqw. */
-      if (TARGET_68020 && !TARGET_68040 && !TARGET_68060 
-          && ADDRESS_REG_P (operands[0]))
+      if (TARGET_CPU32 && ADDRESS_REG_P (operands[0]))
 	{
 	  if (INTVAL (operands[1]) > 8
 	      && INTVAL (operands[1]) <= 16)
@@ -2307,8 +2327,14 @@
 	      return \"subq%.w %#8,%0\;subq%.w %1,%0\";
 	    }
 	}
-    }
 #endif
+      if (ADDRESS_REG_P (operands[0]) && !TARGET_68040)
+#ifdef MOTOROLA  
+	    return \"lea (%c1,%0),%0\";
+#else
+	    return \"lea %0@(%c1),%0\";
+#endif
+    }
   return \"add%.w %1,%0\";
 }")
 
@@ -2319,9 +2345,9 @@
   "!TARGET_5200"
   "*
 {
-#ifndef NO_ADDSUB_Q
   if (GET_CODE (operands[1]) == CONST_INT)
     {
+#ifndef NO_ADDSUB_Q
       /* If the constant would be a negative number when interpreted as
 	 HImode, make it negative.  This is usually, but not always, done
 	 elsewhere in the compiler.  First check for constants out of range,
@@ -2341,11 +2367,10 @@
 			         - INTVAL (operands[1]));
 	  return \"subq%.w %1,%0\";
 	}
-      /* On the 68020 it is faster to use two addqw instructions to
+      /* On the CPU32 it is faster to use two addqw instructions to
 	 add a small integer (8 < N <= 16) to an address register.
 	 Likewise for subqw. */
-      if (TARGET_68020 && !TARGET_68040 && !TARGET_68060 
-          && ADDRESS_REG_P (operands[0])) 
+      if (TARGET_CPU32 && ADDRESS_REG_P (operands[0])) 
 	{
 	  if (INTVAL (operands[1]) > 8
 	      && INTVAL (operands[1]) <= 16)
@@ -2362,8 +2387,14 @@
 	      return \"subq%.w %#8,%0\;subq%.w %1,%0\";
 	    }
 	}
-    }
 #endif
+      if (ADDRESS_REG_P (operands[0]) && !TARGET_68040)
+#ifdef MOTOROLA  
+	    return \"lea (%c1,%0),%0\";
+#else
+	    return \"lea %0@(%c1),%0\";
+#endif
+    }
   return \"add%.w %1,%0\";
 }")