i386.h (PREFERRED_RELOAD_CLASS): Respect an existing class narrower than FLOAT_REGS.

        * i386.h (PREFERRED_RELOAD_CLASS): Respect an existing class
        narrower than FLOAT_REGS.

From-SVN: r22454

gcc/ChangeLog

+Wed Sep 16 15:24:54 1998  Richard Henderson  <rth@cygnus.com>
+
+	* i386.h (PREFERRED_RELOAD_CLASS): Respect an existing class
+	narrower than FLOAT_REGS.
+
 Wed Sep 16 17:51:00 1998  Alexandre Oliva  <oliva@dcc.unicamp.br>
 
 	* cpplib.c: removed OLD_GPLUSPLUS_INCLUDE_DIR

gcc/config/i386/i386.h

@@ -931,9 +931,11 @@ enum reg_class
    Narrow ALL_REGS to GENERAL_REGS.  This supports allowing movsf and
    movdf to do mem-to-mem moves through integer regs. */
 
-#define PREFERRED_RELOAD_CLASS(X,CLASS)	\
-  (GET_CODE (X) == CONST_DOUBLE && GET_MODE (X) != VOIDmode \
-   ? (standard_80387_constant_p (X) ? FLOAT_REGS : NO_REGS) \
+#define PREFERRED_RELOAD_CLASS(X,CLASS)					\
+  (GET_CODE (X) == CONST_DOUBLE && GET_MODE (X) != VOIDmode		\
+   ? (standard_80387_constant_p (X)					\
+      ? reg_class_subset_p (CLASS, FLOAT_REGS) ? CLASS : FLOAT_REGS	\
+      : NO_REGS)							\
    : GET_MODE (X) == QImode && ! reg_class_subset_p (CLASS, Q_REGS) ? Q_REGS \
    : ((CLASS) == ALL_REGS						\
       && GET_MODE_CLASS (GET_MODE (X)) == MODE_FLOAT) ? GENERAL_REGS	\