re PR target/17778 (regression in evaluating long double hexadecimal constants)

        PR 17778
        * config/i386/i386.h (TARGET_96_ROUND_53_LONG_DOUBLE): New.
        * config/i386/freebsd.h (SUBTARGET_OVERRIDE_OPTIONS): Remove.
        (TARGET_96_ROUND_53_LONG_DOUBLE): New.
        * config/i386/i386-modes.def (XF): Use it.

From-SVN: r90543

gcc/ChangeLog

+2004-11-12  Richard Henderson  <rth@redhat.com>
+
+	PR 17778
+	* config/i386/i386.h (TARGET_96_ROUND_53_LONG_DOUBLE): New.
+	* config/i386/freebsd.h (SUBTARGET_OVERRIDE_OPTIONS): Remove.
+	(TARGET_96_ROUND_53_LONG_DOUBLE): New.
+	* config/i386/i386-modes.def (XF): Use it.
+
 2004-11-11  Geoffrey Keating  <geoffk@apple.com>
 
 	* Makefile.in (macro_list): Use move-if-change to avoid spurious

gcc/config/i386/freebsd.h

@@ -138,10 +138,5 @@ Boston, MA 02111-1307, USA.  */
 
 /* FreeBSD sets the rounding precision of the FPU to 53 bits.  Let the
    compiler get the contents of <float.h> and std::numeric_limits correct.  */
-#define SUBTARGET_OVERRIDE_OPTIONS			\
-  do {							\
-    if (!TARGET_64BIT) {				\
-      REAL_MODE_FORMAT (XFmode)				\
-	= &ieee_extended_intel_96_round_53_format;	\
-    }							\
-  } while (0)
+#undef TARGET_96_ROUND_53_LONG_DOUBLE
+#define TARGET_96_ROUND_53_LONG_DOUBLE (!TARGET_64BIT)

gcc/config/i386/i386-modes.def

@@ -29,6 +29,8 @@ FLOAT_MODE (TF, 16, ieee_quad_format);
    In LP64 mode, XFmode has size and alignment 16.  */
 ADJUST_FLOAT_FORMAT (XF, (TARGET_128BIT_LONG_DOUBLE
 			  ? &ieee_extended_intel_128_format
+			  : TARGET_96_ROUND_53_LONG_DOUBLE
+			  ? &ieee_extended_intel_96_round_53_format
 			  : &ieee_extended_intel_96_format));
 ADJUST_BYTESIZE  (XF, TARGET_128BIT_LONG_DOUBLE ? 16 : 12);
 ADJUST_ALIGNMENT (XF, TARGET_128BIT_LONG_DOUBLE ? 16 : 4);

gcc/config/i386/i386.h

@@ -451,6 +451,10 @@ extern int x86_prefetch_sse;
    redefines this to 1.  */
 #define TARGET_MACHO 0
 
+/* Subtargets may reset this to 1 in order to enable 96-bit long double
+   with the rounding mode forced to 53 bits.  */
+#define TARGET_96_ROUND_53_LONG_DOUBLE 0
+
 /* This macro is similar to `TARGET_SWITCHES' but defines names of
    command options that have values.  Its definition is an
    initializer with a subgrouping for each command option.