Update. glibc-2.0.112 cvs/glibc-2_0_112

1999-01-29  Richard Henderson  <rth@twiddle.net>

	* scripts/config.sub: Recognize alpha{pca5[67],ev[67]}.

	* sysdeps/generic/elf/backtracesyms.c (__backtrace_symbols):
	Format pointer differences as longs.

	* sysdeps/alpha/fpu/s_floor.c, sysdeps/alpha/fpu/s_floorf.c:
	Copy commentary from bits/mathinclude.h.  Kill unused defines.

	* sysdeps/alpha/atomicity.h: New file.

3 files changed, 113 insertions, 14 deletions

diff --git a/sysdeps/alpha/atomicity.h b/sysdeps/alpha/atomicity.h
new file mode 100644
index 0000000000..34a538f4c0
--- /dev/null
+++ b/sysdeps/alpha/atomicity.h
@@ -0,0 +1,102 @@
+/* Low-level functions for atomic operations.  Alpha version.
+   Copyright (C) 1999 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Library General Public License as
+   published by the Free Software Foundation; either version 2 of the
+   License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Library General Public License for more details.
+
+   You should have received a copy of the GNU Library General Public
+   License along with the GNU C Library; see the file COPYING.LIB.  If not,
+   write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+   Boston, MA 02111-1307, USA.  */
+
+#ifndef _ATOMICITY_H
+#define _ATOMICITY_H	1
+
+#include <inttypes.h>
+
+
+static inline int
+__attribute__ ((unused))
+exchange_and_add (volatile uint32_t *mem, int val)
+{
+  register int result, tmp;
+
+  __asm__ __volatile__ (
+	"/* Inline exchange & add */\n"
+	"1:\t"
+	"ldl_l	%0,%3\n\t"
+	"addl	%0,%4,%1\n\t"
+	"stl_c	%1,%2\n\t"
+	"beq	%1,2f\n"
+	".subsection 2\n"
+	"2:\t"
+	"br	1b\n"
+	".subsection 1\n\t"
+	"mb\n\t"
+	"/* End exchange & add */"
+	: "=&r"(result), "=&r"(tmp), "=m"(*mem)
+	: "m" (*mem), "r"(val));
+
+  return result;
+}
+
+static inline void
+__attribute__ ((unused))
+atomic_add (volatile uint32_t *mem, int val)
+{
+  register int result;
+
+  __asm__ __volatile__ (
+	"/* Inline exchange & add */\n"
+	"1:\t"
+	"ldl_l	%0,%2\n\t"
+	"addl	%0,%3,%0\n\t"
+	"stl_c	%0,%1\n\t"
+	"beq	%0,2f\n\t"
+	".subsection 2\n"
+	"2:\t"
+	"br	1b\n"
+	".subsection 1\n\t"
+	"mb\n\t"
+	"/* End exchange & add */"
+	: "=&r"(result), "=m"(*mem)
+	: "m" (*mem), "r"(val));
+}
+
+static inline long
+__attribute__ ((unused))
+compare_and_swap (volatile long int *p, long int oldval, long int newval)
+{
+  long int ret;
+
+  __asm__ __volatile__ (
+	"/* Inline compare & swap */\n"
+	"1:\t"
+	"ldq_l	%0,%4\n\t"
+	"cmpeq	%0,%2,%0\n\t"
+	"beq	%0,3f\n\t"
+	"mov	%3,%0\n\t"
+	"stq_c	%0,%1\n\t"
+	"beq	%0,2f\n\t"
+	".subsection 2\n"
+	"2:\t"
+	"br	1b\n"
+	".subsection 1\n\t"
+	"3:\t"
+	"mb\n\t"
+	"/* End compare & swap */"
+	: "=&r"(ret), "=m"(*p)
+	: "r"(oldval), "r"(newval), "m"(*p));
+
+  return ret;
+}
+
+#endif /* atomicity.h */
diff --git a/sysdeps/alpha/fpu/s_floor.c b/sysdeps/alpha/fpu/s_floor.c
index c7e14662fe..146e19b35a 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;
diff --git a/sysdeps/alpha/fpu/s_floorf.c b/sysdeps/alpha/fpu/s_floorf.c
index 7502b6781e..9e693642dd 100644
--- a/sysdeps/alpha/fpu/s_floorf.c
+++ b/sysdeps/alpha/fpu/s_floorf.c
@@ -17,14 +17,12 @@
    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 __floorf __i_floorf
-
 #include <math.h>
 
-#undef __floorf
+
+/* 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.  */
 
 float
 __floorf (float x)
@@ -37,7 +35,7 @@ __floorf (float x)
 	 convert back to S_Floating in the end.  The initial
 	 conversion to T_Floating is needed to handle denormals.  */
 
-      float __tmp1, __tmp2;
+      float tmp1, tmp2;
 
       __asm ("cvtst/s %3,%2\n\t"
 #ifdef _IEEE_FP_INEXACT
@@ -46,7 +44,7 @@ __floorf (float x)
 	     "cvttq/svm %2,%1\n\t"
 #endif
 	     "cvtqt/m %1,%0\n\t"
-	     : "=f"(x), "=&f"(__tmp1), "=&f"(__tmp2)
+	     : "=f"(x), "=&f"(tmp1), "=&f"(tmp2)
 	     : "f"(x));
     }
   return x;