Fix bug building libgcc:

Do not generate small add insn if the source register is eliminable.

From-SVN: r33387

gcc/ChangeLog

+2000-04-24  Nick Clifton  <nickc@cygnus.com>
+
+	* config/fr30/fr30.md (addsi3): Do not use small add instruction if
+	the source register is the frame pointer or arg pointer.
+	(addsi3_small_int): Disallow if source register is the frame
+	pointer or arg pointer.
+
 2000-04-24  Kaveh R. Ghazi  <ghazi@caip.rutgers.edu>
 
 	* configure.in (ENUM_BITFIELDS_ARE_UNSIGNED): Delete redundant

gcc/config/fr30/fr30.md

@@ -621,7 +621,10 @@
     emit_insn (gen_addsi_regs (operands[0], operands[1], operands[2]));
   else if (GET_CODE (operands[2]) != CONST_INT)
     emit_insn (gen_addsi_big_int (operands[0], operands[1], operands[2]));
-  else if ((INTVAL (operands[2]) >= -16) && (INTVAL (operands[2]) <= 15))
+  else if (   (REGNO (operands[1]) != FRAME_POINTER_REGNUM)
+           && (REGNO (operands[1]) != ARG_POINTER_REGNUM)
+	   && (INTVAL (operands[2]) >= -16)
+	   && (INTVAL (operands[2]) <= 15))
     emit_insn (gen_addsi_small_int (operands[0], operands[1], operands[2]));
   else
     emit_insn (gen_addsi_big_int (operands[0], operands[1], operands[2]));
@@ -637,11 +640,15 @@
   "addn	%2, %0"
 )
 
+;; Do not allow an eliminable register in the source register.  It
+;; might be eliminated in favour of the stack pointer, probably
+;; increasing the offset, and so rendering the instruction illegal.
 (define_insn "addsi_small_int"
   [(set (match_operand:SI 0 "register_operand"              "=r,r")
 	(plus:SI (match_operand:SI 1 "register_operand"      "0,0")
 		 (match_operand:SI 2 "add_immediate_operand" "I,J")))]
-  ""
+  "   (REGNO (operands[1]) != FRAME_POINTER_REGNUM)
+   && (REGNO (operands[1]) != ARG_POINTER_REGNUM)"
   "@
    addn	%2, %0
    addn2	%2, %0"