From 92a38c359c748628f33f1352675610755724dbc7 Mon Sep 17 00:00:00 2001
From: Ulrich Drepper <drepper@redhat.com>
Date: Fri, 29 Jan 1999 16:55:14 +0000
Subject: [PATCH] (__floor): Copy commentary from bits/mathinclude.h.  Kill
 unused defines.

---
 sysdeps/alpha/fpu/s_floor.c | 11 +++++------
 1 file changed, 5 insertions(+), 6 deletions(-)

diff --git a/sysdeps/alpha/fpu/s_floor.c b/sysdeps/alpha/fpu/s_floor.c
index c7e14662fe2..146e19b35a1 100644
--- a/sysdeps/alpha/fpu/s_floor.c
+++ b/sysdeps/alpha/fpu/s_floor.c
@@ -17,18 +17,17 @@
    write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
    Boston, MA 02111-1307, USA.  */
 
-#ifndef __USE_EXTERN_INLINES
-#define __USE_EXTERN_INLINES
-#endif
-#define __floor __i_floor
-
 #include <math.h>
 
-#undef __floor
+
+/* Use the -inf rounding mode conversion instructions to implement
+   floor.  We note when the exponent is large enough that the value
+   must be integral, as this avoids unpleasant integer overflows.  */
 
 double
 __floor (double x)
 {
+  /* Check not zero since floor(-0) == -0.  */
   if (x != 0 && fabs (x) < 9007199254740992.0)  /* 1 << DBL_MANT_DIG */
     {
       double __tmp1;
-- 
2.47.3