Use integer ops to load SF constants for software floating point; fix up…

Use integer ops to load SF constants for software floating point; fix up software floating constants in general

From-SVN: r12421

gcc/config/rs6000/rs6000.c

@@ -373,6 +373,24 @@ rs6000_immed_double_const (i0, i1, mode)
 }
 
 
+/* Return the GOT register, creating it if needed.  */
+
+struct rtx_def *
+rs6000_got_register (value)
+     rtx value;
+{
+  if (!pic_offset_table_rtx)
+    {
+      if (reload_in_progress || reload_completed)
+	fatal_insn ("internal error -- needed new GOT register during reload phase to load:", value);
+
+      pic_offset_table_rtx = gen_reg_rtx (SImode);
+    }
+
+  return pic_offset_table_rtx;
+}
+
+
 /* Return non-zero if this function is known to have a null epilogue.  */
 
 int
@@ -614,7 +632,7 @@ num_insns_constant (op, mode)
      rtx op;
      enum machine_mode mode;
 {
-  if (mode != SImode && mode != DImode)
+  if (mode != SImode && mode != DImode && mode != SFmode && mode != DFmode)
     abort ();
 
   if (GET_CODE (op) == CONST_INT)

gcc/config/rs6000/rs6000.h

@@ -1029,12 +1029,13 @@ enum reg_class
    We flag for special constants when we can copy the constant into
    a general register in two insns for DF/DI and one insn for SF.
 
-   'H' is used for DI constants that take 3 insns.  */
+   'H' is used for DI/DF constants that take 3 insns.  */
 
 #define CONST_DOUBLE_OK_FOR_LETTER_P(VALUE, C)				\
-  ((C) == 'G' ? easy_fp_constant (VALUE, GET_MODE (VALUE)) :		\
-   (C) == 'H' ? (num_insns_constant (VALUE, DImode) == 3) :		\
-   0)
+  (  (C) == 'G' ? (num_insns_constant (VALUE, GET_MODE (VALUE))		\
+		   == ((GET_MODE (VALUE) == SFmode) ? 1 : 2))		\
+   : (C) == 'H' ? (num_insns_constant (VALUE, GET_MODE (VALUE)) == 3)	\
+   : 0)
 
 /* Optional extra constraints for this machine.
 
@@ -3018,6 +3019,7 @@ extern void rs6000_override_options ();
 extern void rs6000_file_start ();
 extern struct rtx_def *rs6000_float_const ();
 extern struct rtx_def *rs6000_immed_double_const ();
+extern struct rtx_def *rs6000_got_register ();
 extern int direct_return ();
 extern int any_operand ();
 extern int short_cint_operand ();