arm: Install __sync libfuncs for Linux.

        * config/arm/arm.c (arm_init_libfuncs): Call init_sync_libfuncs
        for Linux.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@181755 138bc75d-0d04-0410-961f-82ee72b054a4

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index c16f1d8..5a6b5d3 100644 (file)
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,5 +1,10 @@
 2011-11-26  Richard Henderson  <rth@redhat.com>
 
+       * config/arm/arm.c (arm_init_libfuncs): Call init_sync_libfuncs
+       for Linux.
+
+2011-11-26  Richard Henderson  <rth@redhat.com>
+
        * optabs.c (expand_atomic_fetch_op): Always return result.
 
        * optabs.c (init_sync_libfuncs_1): Include max in iteration.

diff --git a/gcc/config/arm/arm.c b/gcc/config/arm/arm.c
index e3b0b88..ee26c51 100644 (file)
--- a/gcc/config/arm/arm.c
+++ b/gcc/config/arm/arm.c
@@ -1096,6 +1096,10 @@ arm_set_fixed_conv_libfunc (convert_optab optable, enum machine_mode to,
 static void
 arm_init_libfuncs (void)
 {
+  /* For Linux, we have access to kernel support for atomic operations.  */
+  if (arm_abi == ARM_ABI_AAPCS_LINUX)
+    init_sync_libfuncs (2 * UNITS_PER_WORD);
+
   /* There are no special library functions unless we are using the
      ARM BPABI.  */
   if (!TARGET_BPABI)