PR target/30652

	PR middle-end/20558

	* builtins.c (expand_builtin_interclass_mathfn): Provide a
	generic fallback for isinf.
	* c-cppbuiltin.c (builtin_define_float_constants): Move FP max
	calculation code ...
	* real.c (get_max_float): ... to here.
	* real.h (get_max_float): New.

testsuite:
	* gcc.dg/pr28796-1.c: Add more cases.
	* gcc.dg/pr28796-2.c: Likewise.



git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@126724 138bc75d-0d04-0410-961f-82ee72b054a4

1 files changed, 2 insertions, 25 deletions

diff --git a/gcc/c-cppbuiltin.c b/gcc/c-cppbuiltin.c
index 19bb47c1410..653c5e48442 100644
--- a/gcc/c-cppbuiltin.c
+++ b/gcc/c-cppbuiltin.c
@@ -200,31 +200,8 @@ builtin_define_float_constants (const char *name_prefix,
   /* Since, for the supported formats, B is always a power of 2, we
      construct the following numbers directly as a hexadecimal
      constants.  */
-
-  /* The maximum representable finite floating-point number,
-     (1 - b**-p) * b**emax  */
-  {
-    int i, n;
-    char *p;
-
-    strcpy (buf, "0x0.");
-    n = fmt->p;
-    for (i = 0, p = buf + 4; i + 3 < n; i += 4)
-      *p++ = 'f';
-    if (i < n)
-      *p++ = "08ce"[n - i];
-    sprintf (p, "p%d", fmt->emax);
-    if (fmt->pnan < fmt->p)
-      {
-	/* This is an IBM extended double format made up of two IEEE
-	   doubles.  The value of the long double is the sum of the
-	   values of the two parts.  The most significant part is
-	   required to be the value of the long double rounded to the
-	   nearest double.  Rounding means we need a slightly smaller
-	   value for LDBL_MAX.  */
-	buf[4 + fmt->pnan / 4] = "7bde"[fmt->pnan % 4];
-      }
-  }
+  get_max_float (fmt, buf, sizeof (buf));
+  
   sprintf (name, "__%s_MAX__", name_prefix);
   builtin_define_with_hex_fp_value (name, type, decimal_dig, buf, fp_suffix, fp_cast);