--- gcc/config/unx386.h	2018/04/24 17:59:17	1.1.1.2
+++ gcc/config/unx386.h	2018/04/24 18:04:53	1.1.1.3
@@ -47,7 +47,7 @@ the Free Software Foundation, 675 Mass A
 /* Output the size-letter for an opcode.
    CODE is the letter used in an operand spec (L, B, W, S or Q).
    CH is the corresponding lower case letter
-     (except if CODE is L then CH is `l').  */
+     (except if CODE is `Q' then CH is `l', unless GAS_MNEMONICS).  */
 #define PUT_OP_SIZE(CODE,CH,FILE) putc (CH,(FILE))
 
 /* Opcode suffix for fullword insn.  */
@@ -125,3 +125,21 @@ the Free Software Foundation, 675 Mass A
 
 #define ASM_GLOBALIZE_LABEL(FILE,NAME)	\
   (fputs (".globl ", FILE), assemble_name (FILE, NAME), fputs ("\n", FILE))
+
+/* By default, target has a 80387, uses IEEE compatible arithmetic,
+   and returns float values in the 387, ie,
+   (TARGET_80387 | TARGET_IEEE_FP | TARGET_FLOAT_RETURNS_IN_80387) */
+
+#define TARGET_DEFAULT 0301
+
+/* Floating-point return values come in the FP register.  */
+
+#define VALUE_REGNO(MODE) \
+  (GET_MODE_CLASS (MODE) == MODE_FLOAT				\
+   && TARGET_FLOAT_RETURNS_IN_80387 ? FIRST_FLOAT_REG : 0)
+
+/* 1 if N is a possible register number for a function value. */
+
+#define FUNCTION_VALUE_REGNO_P(N) \
+  ((N) == 0 || ((N)== FIRST_FLOAT_REG && TARGET_FLOAT_RETURNS_IN_80387))
+