re PR target/27277 (standard i387 constant loading insns (fldz, fld1) are not generated anymore)

	PR target/27277
	* config/i386/i386.c (ix86_rtx_costs) [FLOAT_EXTEND]: For
	standard 80387 constants, raise the cost to prevent
	compress_float_constant() to generate load from memory.

From-SVN: r113622

gcc/ChangeLog

+2006-05-08  Uros Bizjak  <uros@kss-loka.si>
+
+	PR target/27277
+	* config/i386/i386.c (ix86_rtx_costs) [FLOAT_EXTEND]: For
+	standard 80387 constants, raise the cost to prevent
+	compress_float_constant() to generate load from memory.
+
 2006-05-08  Kazu Hirata  <kazu@codesourcery.com>
 
 	* config/arm/constraints.md (c): Fix a typo.

gcc/config/i386/i386.c

@@ -17102,7 +17102,22 @@ ix86_rtx_costs (rtx x, int code, int outer_code, int *total)
       if (!TARGET_SSE_MATH
 	  || mode == XFmode
 	  || (mode == DFmode && !TARGET_SSE2))
-	*total = 0;
+	/* For standard 80387 constants, raise the cost to prevent
+	   compress_float_constant() to generate load from memory.  */
+	switch (standard_80387_constant_p (XEXP (x, 0)))
+	  {
+	  case -1:
+	  case 0:
+	    *total = 0;
+	    break;
+	  case 1: /* 0.0 */
+	    *total = 1;
+	    break;
+	  default:
+	    *total = (x86_ext_80387_constants & TUNEMASK
+		      || optimize_size
+		      ? 1 : 0);
+	  }
       return false;
 
     case ABS: