From e1e46622ac0fce73d802fa4a8a2e83cc25cd9e7a Mon Sep 17 00:00:00 2001
From: Waldemar Brodkorb <wbx@openadk.org>
Date: Sat, 14 Feb 2015 23:04:02 -0600
Subject: Revert "resolve merge"

This reverts commit 6b6ede3d15f04fe825cfa9f697507457e3640344.
---
 libpthread/linuxthreads/sysdeps/i386/pt-machine.h | 93 ++++++++---------------
 1 file changed, 32 insertions(+), 61 deletions(-)

(limited to 'libpthread/linuxthreads/sysdeps/i386/pt-machine.h')

diff --git a/libpthread/linuxthreads/sysdeps/i386/pt-machine.h b/libpthread/linuxthreads/sysdeps/i386/pt-machine.h
index 24c5e6c7c..82a5cf077 100644
--- a/libpthread/linuxthreads/sysdeps/i386/pt-machine.h
+++ b/libpthread/linuxthreads/sysdeps/i386/pt-machine.h
@@ -18,14 +18,17 @@
    License along with the GNU C Library; see the file COPYING.LIB.  If
    not, see <http://www.gnu.org/licenses/>.  */
 
+#if defined __pentiumpro__ || defined __pentium4__ || defined __athlon__ || \
+	defined __k8__
+# include "i686/pt-machine.h"
+#else
+
 #ifndef _PT_MACHINE_H
 #define _PT_MACHINE_H	1
 
-#include <features.h>
-
 #ifndef __ASSEMBLER__
 #ifndef PT_EI
-# define PT_EI __extern_always_inline __attribute__((visibility("hidden")))
+# define PT_EI __extern_always_inline
 #endif
 
 extern long int testandset (int *spinlock);
@@ -36,54 +39,6 @@ extern int __compare_and_swap (long int *p, long int oldval, long int newval);
 #define CURRENT_STACK_FRAME  __builtin_frame_address (0)
 
 
-/* See if we can optimize for newer cpus... */
-#if defined __GNUC__ && __GNUC__ >= 2 && \
-   (defined __i486__ || defined __pentium__ || defined __pentiumpro__ || defined __pentium4__ || \
-    defined __athlon__ || defined __k8__)
-
-/* Spinlock implementation; required.  */
-PT_EI long int
-testandset (int *spinlock)
-{
-  long int ret;
-
-  __asm__ __volatile__ (
-	"xchgl %0, %1"
-	: "=r" (ret), "=m" (*spinlock)
-	: "0" (1), "m" (*spinlock)
-	: "memory");
-
-  return ret;
-}
-
-/* Compare-and-swap for semaphores.  It's always available on i686.  */
-#define HAS_COMPARE_AND_SWAP
-
-PT_EI int
-__compare_and_swap (long int *p, long int oldval, long int newval)
-{
-  char ret;
-  long int readval;
-
-  __asm__ __volatile__ ("lock; cmpxchgl %3, %1; sete %0"
-			: "=q" (ret), "=m" (*p), "=a" (readval)
-			: "r" (newval), "m" (*p), "a" (oldval)
-			: "memory");
-  return ret;
-}
-
-#if defined(__ASSUME_LDT_WORKS) && __ASSUME_LDT_WORKS > 0
-#include "useldt.h"
-#endif
-
-/* The P4 and above really want some help to prevent overheating.  */
-#define BUSY_WAIT_NOP	__asm__ ("rep; nop")
-
-
-#else /* Generic i386 implementation */
-
-extern int compare_and_swap_is_available (void);
-
 /* Spinlock implementation; required.  */
 PT_EI long int
 testandset (int *spinlock)
@@ -120,27 +75,43 @@ __compare_and_swap (long int *p, long int oldval, long int newval)
   return ret;
 }
 
+
+PT_EI int get_eflags (void);
+PT_EI int
+get_eflags (void)
+{
+  int res;
+  __asm__ __volatile__ ("pushfl; popl %0" : "=r" (res) : );
+  return res;
+}
+
+
+PT_EI void set_eflags (int newflags);
+PT_EI void
+set_eflags (int newflags)
+{
+  __asm__ __volatile__ ("pushl %0; popfl" : : "r" (newflags) : "cc");
+}
+
+
+PT_EI int compare_and_swap_is_available (void);
 PT_EI int
 compare_and_swap_is_available (void)
 {
+  int oldflags = get_eflags ();
   int changed;
-  int oldflags;
-  /* get EFLAGS */
-  __asm__ __volatile__ ("pushfl; popl %0" : "=r" (oldflags) : );
   /* Flip AC bit in EFLAGS.  */
-  __asm__ __volatile__ ("pushl %0; popfl" : : "r" (oldflags ^ 0x40000) : "cc");
-  /* reread EFLAGS */
-  __asm__ __volatile__ ("pushfl; popl %0" : "=r" (changed) : );
+  set_eflags (oldflags ^ 0x40000);
   /* See if bit changed.  */
-  changed = (changed ^ oldflags) & 0x40000;
+  changed = (get_eflags () ^ oldflags) & 0x40000;
   /* Restore EFLAGS.  */
-  __asm__ __volatile__ ("pushl %0; popfl" : : "r" (oldflags) : "cc");
+  set_eflags (oldflags);
   /* If the AC flag did not change, it's a 386 and it lacks cmpxchg.
      Otherwise, it's a 486 or above and it has cmpxchg.  */
   return changed != 0;
 }
-#endif /* Generic i386 implementation */
-
 #endif /* __ASSEMBLER__ */
 
 #endif /* pt-machine.h */
+
+#endif
-- 
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