From: Richard Sandiford <rdsandiford@googlemail.com>
Date: Thu, 26 Jun 2008 21:28:30 +0000 (+0000)
Subject: libfuncs.h (LTI_synchronize): New libfunc_index.
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=e2ff10a93c232352cd9d648baa1070d2982f18cb;p=gcc.git

libfuncs.h (LTI_synchronize): New libfunc_index.

gcc/
	* libfuncs.h (LTI_synchronize): New libfunc_index.
	(synchronize_libfunc): Declare.
	* builtins.c (expand_builtin_synchronize): Consider using
	synchronize_libfunc before falling back on an asm blockage.
	* config/mips/mips.c: Include libfuncs.h
	(mips_init_libfuncs): Initialize synchronize_libfunc for TARGET_MIPS16.

From-SVN: r137162
---

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index c6570991875..3f2a1bd8373 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,12 @@
+2008-06-26  Richard Sandiford  <rdsandiford@googlemail.com>
+
+	* libfuncs.h (LTI_synchronize): New libfunc_index.
+	(synchronize_libfunc): Declare.
+	* builtins.c (expand_builtin_synchronize): Consider using
+	synchronize_libfunc before falling back on an asm blockage.
+	* config/mips/mips.c: Include libfuncs.h
+	(mips_init_libfuncs): Initialize synchronize_libfunc for TARGET_MIPS16.
+
 2008-06-26  Nathan Froyd  <froydnj@codesourcery.com>
 
 	* config/rs6000/rs6000.c (emit_allocate_stack): Add copy_r11
diff --git a/gcc/builtins.c b/gcc/builtins.c
index 1039c603795..10af34254aa 100644
--- a/gcc/builtins.c
+++ b/gcc/builtins.c
@@ -5999,6 +5999,12 @@ expand_builtin_synchronize (void)
     }
 #endif
 
+  if (synchronize_libfunc != NULL_RTX)
+    {
+      emit_library_call (synchronize_libfunc, LCT_NORMAL, VOIDmode, 0);
+      return;
+    }
+
   /* If no explicit memory barrier instruction is available, create an
      empty asm stmt with a memory clobber.  */
   x = build4 (ASM_EXPR, void_type_node, build_string (0, ""), NULL, NULL,
diff --git a/gcc/config/mips/mips.c b/gcc/config/mips/mips.c
index 56180054d74..e8b384e1db2 100644
--- a/gcc/config/mips/mips.c
+++ b/gcc/config/mips/mips.c
@@ -42,6 +42,7 @@ along with GCC; see the file COPYING3.  If not see
 #include "function.h"
 #include "expr.h"
 #include "optabs.h"
+#include "libfuncs.h"
 #include "flags.h"
 #include "reload.h"
 #include "tm_p.h"
@@ -9424,6 +9425,11 @@ mips_init_libfuncs (void)
   else
     /* Register the gofast functions if selected using --enable-gofast.  */
     gofast_maybe_init_libfuncs ();
+
+  /* The MIPS16 ISA does not have an encoding for "sync", so we rely
+     on an external non-MIPS16 routine to implement __sync_synchronize.  */
+  if (TARGET_MIPS16)
+    synchronize_libfunc = init_one_libfunc ("__sync_synchronize");
 }
 
 /* Return the length of INSN.  LENGTH is the initial length computed by
diff --git a/gcc/libfuncs.h b/gcc/libfuncs.h
index f7f6a6299c4..ef636da36bb 100644
--- a/gcc/libfuncs.h
+++ b/gcc/libfuncs.h
@@ -40,6 +40,8 @@ enum libfunc_index
   LTI_profile_function_entry,
   LTI_profile_function_exit,
 
+  LTI_synchronize,
+
   LTI_gcov_flush,
 
   LTI_MAX
@@ -69,6 +71,8 @@ extern GTY(()) rtx libfunc_table[LTI_MAX];
 #define profile_function_entry_libfunc	(libfunc_table[LTI_profile_function_entry])
 #define profile_function_exit_libfunc	(libfunc_table[LTI_profile_function_exit])
 
+#define synchronize_libfunc	(libfunc_table[LTI_synchronize])
+
 #define gcov_flush_libfunc	(libfunc_table[LTI_gcov_flush])
 
 #endif /* GCC_LIBFUNCS_H */