real.h (struct real_value): Use the same type for all bitfields.

* real.h (struct real_value): Use the same type for all
bitfields.  Rename exp to uexp.
(REAL_EXP, SET_REAL_EXP): New accessor macros for uexp.
Adjust all uses of exp...
* builtins.c: ... here, ...
* emit-rtl.c: ... here, and ...
* real.c: ... and here.

From-SVN: r79802

gcc/ChangeLog

+2004-03-21  Alexandre Oliva  <aoliva@redhat.com>
+
+	* real.h (struct real_value): Use the same type for all
+	bitfields.  Rename exp to uexp.
+	(REAL_EXP, SET_REAL_EXP): New accessor macros for uexp.
+	Adjust all uses of exp...
+	* builtins.c: ... here, ...
+	* emit-rtl.c: ... here, and ...
+	* real.c: ... and here.
+
 2004-03-21  Gabriel Dos Reis  <gdr@integrable-solutions.net>
 
 	* pretty-print.c (pp_base_maybe_space): New function.

gcc/builtins.c

@@ -6812,7 +6812,7 @@ fold_builtin (tree exp)
 	      REAL_VALUE_TYPE cst;
 
 	      real_convert (&cst, TYPE_MODE (type), &dconstpi);
-	      cst.exp -= 2;
+	      SET_REAL_EXP (&cst, REAL_EXP (&cst) - 2);
 	      return build_real (type, cst);
 	    }
 	}

gcc/emit-rtl.c

@@ -5313,7 +5313,7 @@ init_emit_once (int line_numbers)
   REAL_VALUE_FROM_INT (dconstm2, -2, -1, double_mode);
 
   dconsthalf = dconst1;
-  dconsthalf.exp--;
+  SET_REAL_EXP (&dconsthalf, REAL_EXP (&dconsthalf) - 1);
 
   real_arithmetic (&dconstthird, RDIV_EXPR, &dconst1, &dconst3);
 

gcc/real.h

@@ -42,14 +42,23 @@ enum real_value_class {
 
 struct real_value GTY(())
 {
-  ENUM_BITFIELD (real_value_class) class : 2;
+  /* Use the same underlying type for all bit-fields, so as to make
+     sure they're packed together, otherwise REAL_VALUE_TYPE_SIZE will
+     be miscomputed.  */
+  unsigned int /* ENUM_BITFIELD (real_value_class) */ class : 2;
   unsigned int sign : 1;
   unsigned int signalling : 1;
   unsigned int canonical : 1;
-  signed int exp : EXP_BITS;
+  unsigned int uexp : EXP_BITS;
   unsigned long sig[SIGSZ];
 };
 
+#define REAL_EXP(REAL) \
+  ((int)((REAL)->uexp ^ (unsigned int)(1 << (EXP_BITS - 1))) \
+   - (1 << (EXP_BITS - 1)))
+#define SET_REAL_EXP(REAL, EXP) \
+  ((REAL)->uexp = ((unsigned int)(EXP) & (unsigned int)((1 << EXP_BITS) - 1)))
+
 /* Various headers condition prototypes on #ifdef REAL_VALUE_TYPE, so it
    needs to be a macro.  We do need to continue to have a structure tag
    so that other headers can forward declare it.  */