atomicity.h: Remove tricky .subsetion bits.

2001-01-25  Richard Henderson  <rth@redhat.com>

	* config/cpu/alpha/bits/atomicity.h: Remove tricky .subsetion
	bits. Fixes Tru64 build issues.

From-SVN: r39290

diff --git a/libstdc++-v3/ChangeLog b/libstdc++-v3/ChangeLog
index 34a4cfee3ab4635d5e8f5b57d83d5c0d6907fcfc..4306078899e79e1343991fa5a8e6e582089f9cc0 100644 (file)
--- a/libstdc++-v3/ChangeLog
+++ b/libstdc++-v3/ChangeLog
@@ -1,3 +1,8 @@
+2001-01-25  Richard Henderson  <rth@redhat.com>
+
+       * config/cpu/alpha/bits/atomicity.h: Remove tricky .subsetion
+       bits. Fixes Tru64 build issues.
+       
 2001-01-25  Michael Sokolov  <msokolov@ivan.Harhan.ORG>
 
        * acinclude.m4 (GLIBCPP_CHECK_GNU_MAKE): Bourne shell portability bug

diff --git a/libstdc++-v3/config/cpu/alpha/bits/atomicity.h b/libstdc++-v3/config/cpu/alpha/bits/atomicity.h
index d62e6d9234b165b96afa04fd629e87b1a94210ef..d2f67bb71a9b62753c73230b23dfee6fc4f9cff7 100644 (file)
--- a/libstdc++-v3/config/cpu/alpha/bits/atomicity.h
+++ b/libstdc++-v3/config/cpu/alpha/bits/atomicity.h
@@ -1,5 +1,5 @@
 /* Low-level functions for atomic operations.  Alpha version.
-   Copyright (C) 1999 Free Software Foundation, Inc.
+   Copyright (C) 1999, 2000, 2001 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
@@ -20,6 +20,11 @@
 #ifndef _BITS_ATOMICITY_H
 #define _BITS_ATOMICITY_H      1
 
+/* @@@ With gas we can play nice .subsection games to get the
+   non-predicted branch pointing forward.  But Digital assemblers
+   don't understand those directives.  This isn't a terribly
+   important issue, so just ignore it.  */
+
 typedef int _Atomic_word;
 
 static inline _Atomic_word
@@ -29,20 +34,14 @@ __exchange_and_add (volatile _Atomic_word* __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 1\n"
-       "2:\t"
-       "br     1b\n"
-       ".previous\n\t"
-       "mb\n\t"
-       "/* End exchange & add */"
-       : "=&r"(__result), "=&r"(__tmp), "=m"(*__mem)
-       : "m" (*__mem), "r"(__val));
+      "\n$Lxadd_%=:\n\t"
+      "ldl_l  %0,%3\n\t"
+      "addl   %0,%4,%1\n\t"
+      "stl_c  %1,%2\n\t"
+      "beq    %1,$Lxadd_%=\n\t"
+      "mb"
+      : "=&r"(__result), "=&r"(__tmp), "=m"(*__mem)
+      : "m" (*__mem), "r"(__val));
 
   return __result;
 }
@@ -54,20 +53,14 @@ __atomic_add (volatile _Atomic_word* __mem, int __val)
   register _Atomic_word __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 1\n"
-       "2:\t"
-       "br     1b\n"
-       ".previous\n\t"
-       "mb\n\t"
-       "/* End exchange & add */"
-       : "=&r"(__result), "=m"(*__mem)
-       : "m" (*__mem), "r"(__val));
+      "\n$Ladd_%=:\n\t"
+      "ldl_l  %0,%2\n\t"
+      "addl   %0,%3,%0\n\t"
+      "stl_c  %0,%1\n\t"
+      "beq    %0,$Ladd_%=\n\t"
+      "mb"
+      : "=&r"(__result), "=m"(*__mem)
+      : "m" (*__mem), "r"(__val));
 }
 
 static inline int
@@ -77,23 +70,16 @@ __compare_and_swap (volatile long *__p, long __oldval, long __newval)
   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 1\n"
-       "2:\t"
-       "br     1b\n"
-       ".previous\n\t"
-       "3:\t"
-       "mb\n\t"
-       "/* End compare & swap */"
-       : "=&r"(__ret), "=m"(*__p)
-       : "r"(__oldval), "r"(__newval), "m"(*__p));
+      "\n$Lcas_%=:\n\t"
+      "ldq_l  %0,%4\n\t"
+      "cmpeq  %0,%2,%0\n\t"
+      "beq    %0,3f\n\t"
+      "mov    %3,%0\n\t"
+      "stq_c  %0,%1\n\t"
+      "beq    %0,$Lcas_%=\n\t"
+      "mb"
+      : "=&r"(__ret), "=m"(*__p)
+      : "r"(__oldval), "r"(__newval), "m"(*__p));
 
   return __ret;
 }