Fix for m68k -O0 libstdc++ compiler abort.

	* config/m68k/m68k.h (HARD_REGNO_MODE_OK): For FP regs, add REGNO >= 16
	check.  Add comment to document problems with TARGET_SUN_FPA version
	of this macro.
	* config/m68k/m68k.md (movxf+1): Support 'r'/'r' moves.

From-SVN: r23056

gcc/ChangeLog

+Tue Oct 13 17:51:04 1998  Jim Wilson  <wilson@cygnus.com>
+
+	* config/m68k/m68k.h (HARD_REGNO_MODE_OK): For FP regs, add REGNO >= 16
+	check.  Add comment to document problems with TARGET_SUN_FPA version
+	of this macro.
+	* config/m68k/m68k.md (movxf+1): Support 'r'/'r' moves.
+
 Tue Oct 13 17:46:18 1998  Kaveh R. Ghazi  <ghazi@caip.rutgers.edu>
 
 	* Makefile.in (gencheck.o): Depend on gansidecl.h.

gcc/config/m68k/m68k.h

@@ -471,8 +471,8 @@ extern int target_flags;
 
 #define HARD_REGNO_MODE_OK(REGNO, MODE) \
   (((REGNO) < 16					\
-   && !((REGNO) < 8 && (REGNO) + GET_MODE_SIZE ((MODE)) / 4 > 8))	\
-   || ((REGNO) < 24				        \
+    && !((REGNO) < 8 && (REGNO) + GET_MODE_SIZE (MODE) / 4 > 8))	\
+   || ((REGNO) >= 16 && (REGNO) < 24				        \
        && TARGET_68881                                  \
        && (GET_MODE_CLASS (MODE) == MODE_FLOAT		\
 	   || GET_MODE_CLASS (MODE) == MODE_COMPLEX_FLOAT)))
@@ -486,6 +486,11 @@ extern int target_flags;
    (apparently) hold whatever you feel like putting in them.
    If using the fpa, don't put a double in d7/a0.  */
 
+/* ??? This is confused.  The check to prohibit d7/a0 overlaps should always
+   be enabled regardless of whether TARGET_FPA is specified.  It isn't clear
+   what the other d/a register checks are for.  Every check using REGNO
+   actually needs to use a range, e.g. 24>=X<56 not <56.  There is probably
+   no one using this code anymore.  */
 #define HARD_REGNO_MODE_OK(REGNO, MODE) \
 (((REGNO) < 16								\
   && !(TARGET_FPA							\

gcc/config/m68k/m68k.md

@@ -1224,8 +1224,8 @@
 }")
 
 (define_insn ""
-  [(set (match_operand:XF 0 "nonimmediate_operand" "=f,m,f,!r,!f")
-	(match_operand:XF 1 "nonimmediate_operand" "m,f,f,f,r"))]
+  [(set (match_operand:XF 0 "nonimmediate_operand" "=f,m,f,!r,!f,!r")
+	(match_operand:XF 1 "nonimmediate_operand" "m,f,f,f,r,!r"))]
   "TARGET_68881"
   "*
 {
@@ -1247,15 +1247,20 @@
         return \"fmove%.x %1,%0\";
       return \"fmove%.x %f1,%0\";
     }
-  if (REG_P (operands[0]))
+  if (FP_REG_P (operands[1]))
     {
-      output_asm_insn (\"fmove%.x %f1,%-\;move%.l %+,%0\", operands);
-      operands[0] = gen_rtx_REG (SImode, REGNO (operands[0]) + 1);
-      output_asm_insn (\"move%.l %+,%0\", operands);
-      operands[0] = gen_rtx_REG (SImode, REGNO (operands[0]) + 1);
-      return \"move%.l %+,%0\";
+      if (REG_P (operands[0]))
+	{
+	  output_asm_insn (\"fmove%.x %f1,%-\;move%.l %+,%0\", operands);
+	  operands[0] = gen_rtx_REG (SImode, REGNO (operands[0]) + 1);
+	  output_asm_insn (\"move%.l %+,%0\", operands);
+	  operands[0] = gen_rtx_REG (SImode, REGNO (operands[0]) + 1);
+	  return \"move%.l %+,%0\";
+	}
+      /* Must be memory destination.  */
+      return \"fmove%.x %f1,%0\";
     }
-  return \"fmove%.x %f1,%0\";
+  return output_move_double (operands);
 }
 ")