Add outline-atomics to target attribute.

	* common/config/aarch64/aarch64-common.c (aarch64_handle_option):
	Handle OPT_moutline_atomics.
	* config/aarch64/aarch64.c: Add outline-atomics to
	aarch64_attributes.

	* doc/extend.texi: Document the newly added target attribute.

	* gcc.target/aarch64/target_attr_20.c: New test.
	* gcc.target/aarch64/target_attr_21.c: New test.

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index b97e8ea51f7bb0934eda36b50afd28d364ad13b6..d48fbfcab81d96e29ec9a5438640022722ef94ff 100644 (file)
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,11 @@
+2020-05-21  Martin Liska  <mliska@suse.cz>
+
+       * common/config/aarch64/aarch64-common.c (aarch64_handle_option):
+       Handle OPT_moutline_atomics.
+       * config/aarch64/aarch64.c: Add outline-atomics to
+       aarch64_attributes.
+       * doc/extend.texi: Document the newly added target attribute.
+
 2020-05-21  Uroš Bizjak  <ubizjak@gmail.com>
 
        PR target/95218

diff --git a/gcc/common/config/aarch64/aarch64-common.c b/gcc/common/config/aarch64/aarch64-common.c
index 0bddcc8c3e9282a957c5479b4df7f68058093bab..51bd319d6d30a9f39abd7eff4bd61bd224cd0a4a 100644 (file)
--- a/gcc/common/config/aarch64/aarch64-common.c
+++ b/gcc/common/config/aarch64/aarch64-common.c
@@ -116,6 +116,10 @@ aarch64_handle_option (struct gcc_options *opts,
       opts->x_flag_omit_leaf_frame_pointer = val;
       return true;
 
+    case OPT_moutline_atomics:
+      opts->x_aarch64_flag_outline_atomics = val;
+      return true;
+
     default:
       return true;
     }

diff --git a/gcc/config/aarch64/aarch64.c b/gcc/config/aarch64/aarch64.c
index 79c016f4dc37c5cc02934dddee20db3a4fa9e8df..78db0a5632326be9c6e20ff09b9dd17cfa231cf0 100644 (file)
--- a/gcc/config/aarch64/aarch64.c
+++ b/gcc/config/aarch64/aarch64.c
@@ -15266,6 +15266,8 @@ static const struct aarch64_attribute_info aarch64_attributes[] =
      aarch64_handle_attr_branch_protection, OPT_mbranch_protection_ },
   { "sign-return-address", aarch64_attr_enum, false, NULL,
      OPT_msign_return_address_ },
+  { "outline-atomics", aarch64_attr_bool, true, NULL,
+     OPT_moutline_atomics},
   { NULL, aarch64_attr_custom, false, NULL, OPT____ }
 };
 

diff --git a/gcc/doc/extend.texi b/gcc/doc/extend.texi
index c80848e9061104463424b9e36d9d525d98591532..a2ebef8cf8ca30f073e65744632268c6a221178e 100644 (file)
--- a/gcc/doc/extend.texi
+++ b/gcc/doc/extend.texi
@@ -4066,6 +4066,12 @@ Select the function scope on which branch protection will be applied.  The
 behavior and permissible arguments are the same as for the command-line option
 @option{-mbranch-protection=}.  The default value is @code{none}.
 
+@item outline-atomics
+@cindex @code{outline-atomics} function attribute, AArch64
+Enable or disable calls to out-of-line helpers to implement atomic operations.
+This corresponds to the behavior of the command line options
+@option{-moutline-atomics} and @option{-mno-outline-atomics}.
+
 @end table
 
 The above target attributes can be specified as follows:

diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog
index 85f73e486416017f3c46a65287bc5083b64de8c1..3940cfd48c4f21b2e13ed4d9e1c21e611855dc9b 100644 (file)
--- a/gcc/testsuite/ChangeLog
+++ b/gcc/testsuite/ChangeLog
@@ -1,3 +1,8 @@
+2020-05-21  Martin Liska  <mliska@suse.cz>
+
+       * gcc.target/aarch64/target_attr_20.c: New test.
+       * gcc.target/aarch64/target_attr_21.c: New test.
+
 2020-05-20  Jozef Lawrynowicz  <jozef.l@mittosystems.com>
 
        * g++.dg/warn/Wconversion-null-2.C: Add explicit declarations for l()

diff --git a/gcc/testsuite/gcc.target/aarch64/target_attr_20.c b/gcc/testsuite/gcc.target/aarch64/target_attr_20.c
new file mode 100644 (file)
index 0000000..509fb03
--- /dev/null
+++ b/gcc/testsuite/gcc.target/aarch64/target_attr_20.c
@@ -0,0 +1,27 @@
+/* { dg-do compile } */
+/* { dg-options "-march=armv8-a+nolse -moutline-atomics" } */
+
+int b, c, d, e, f, h;
+short g;
+int foo (int) __attribute__ ((__const__));
+
+__attribute__ ((target ("no-outline-atomics")))
+void
+bar (void)
+{
+  while (1)
+    {
+      while (1)
+       {
+         __atomic_load_n (&e, 0);
+         if (foo (2))
+           __sync_val_compare_and_swap (&c, 0, f);
+         b = 1;
+         if (h == e)
+           break;
+       }
+      __sync_val_compare_and_swap (&g, -1, f);
+    }
+}
+
+/* { dg-final { scan-assembler-not "bl.*__aarch64_cas2_acq_rel" } } */

diff --git a/gcc/testsuite/gcc.target/aarch64/target_attr_21.c b/gcc/testsuite/gcc.target/aarch64/target_attr_21.c
new file mode 100644 (file)
index 0000000..acace4c
--- /dev/null
+++ b/gcc/testsuite/gcc.target/aarch64/target_attr_21.c
@@ -0,0 +1,27 @@
+/* { dg-do compile } */
+/* { dg-options "-march=armv8-a+nolse -mno-outline-atomics" } */
+
+int b, c, d, e, f, h;
+short g;
+int foo (int) __attribute__ ((__const__));
+
+__attribute__ ((target ("outline-atomics")))
+void
+bar (void)
+{
+  while (1)
+    {
+      while (1)
+       {
+         __atomic_load_n (&e, 0);
+         if (foo (2))
+           __sync_val_compare_and_swap (&c, 0, f);
+         b = 1;
+         if (h == e)
+           break;
+       }
+      __sync_val_compare_and_swap (&g, -1, f);
+    }
+}
+
+/* { dg-final { scan-assembler-times "bl.*__aarch64_cas2_acq_rel" 1 } } */