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authorUlrich Drepper <drepper@redhat.com>1999-01-29 16:58:13 +0000
committerUlrich Drepper <drepper@redhat.com>1999-01-29 16:58:13 +0000
commit6eaccb759aff7e3fdd679d39aabaf773b18dfbd1 (patch)
treeba33932b592d55490b64f2c76ad367e0530ad170 /sysdeps/alpha
parent21ab6fb6bc4c2eb2b3a9b533d11942b45865aca5 (diff)
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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.
Diffstat (limited to 'sysdeps/alpha')
-rw-r--r--sysdeps/alpha/atomicity.h102
-rw-r--r--sysdeps/alpha/fpu/s_floor.c11
-rw-r--r--sysdeps/alpha/fpu/s_floorf.c14
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;