sourcebuild.texi (arm_acq_rel): Document new effective target.

2016-06-01  Thomas Preud'homme  <thomas.preudhomme@arm.com>

    gcc/
    * doc/sourcebuild.texi (arm_acq_rel): Document new effective target.

    gcc/testsuite/
    * lib/target-supports.exp (check_effective_target_arm_acq_rel): New
    procedure.

From-SVN: r237002

gcc/ChangeLog

+2016-06-01  Thomas Preud'homme  <thomas.preudhomme@arm.com>
+
+	* doc/sourcebuild.texi (arm_acq_rel): Document new effective target.
+
 2016-06-01  Eduard Sanou  <dhole@openmailbox.org>
 
 	* doc/cppenv.texi: Note that the `%s` in `date` is a non-standard

gcc/doc/sourcebuild.texi

@@ -1597,6 +1597,9 @@ ARM target supports executing ARMv8.1 Adv.SIMD instructions.  Some
 multilibs may be incompatible with the options needed.  Implies
 arm_v8_1a_neon_ok.
 
+@item arm_acq_rel
+ARM target supports acquire-release instructions.
+
 @item arm_prefer_ldrd_strd
 ARM target prefers @code{LDRD} and @code{STRD} instructions over
 @code{LDM} and @code{STM} instructions.

gcc/testsuite/ChangeLog

+2016-06-01  Thomas Preud'homme  <thomas.preudhomme@arm.com>
+
+	* lib/target-supports.exp (check_effective_target_arm_acq_rel): New
+	procedure.
+
 2016-06-01  Eduard Sanou  <dhole@openmailbox.org>
 
 	* gcc.dg/cpp/source_date_epoch-1.c: New file, test the proper

gcc/testsuite/lib/target-supports.exp

@@ -3494,6 +3494,25 @@ proc check_effective_target_arm_neonv2 { } {
     }
 }
 
+# Return 1 if this is an ARM target with load acquire and store release
+# instructions for 8-, 16- and 32-bit types.
+
+proc check_effective_target_arm_acq_rel { } {
+    return [check_no_compiler_messages arm_acq_rel object {
+	void
+	load_acquire_store_release (void)
+	{
+	  asm ("lda r0, [r1]\n\t"
+	       "stl r0, [r1]\n\t"
+	       "ldah r0, [r1]\n\t"
+	       "stlh r0, [r1]\n\t"
+	       "ldab r0, [r1]\n\t"
+	       "stlb r0, [r1]"
+	       : : : "r0", "memory");
+	}
+    }]
+}
+
 # Return 1 if this a Loongson-2E or -2F target using an ABI that supports
 # the Loongson vector modes.
 
@@ -5725,6 +5744,8 @@ proc check_effective_target_sync_int_long { } {
 	     || [istarget aarch64*-*-*]
 	     || [istarget alpha*-*-*] 
 	     || [istarget arm*-*-linux-*] 
+	     || ([istarget arm*-*-*]
+		 && [check_effective_target_arm_acq_rel])
 	     || [istarget bfin*-*linux*]
 	     || [istarget hppa*-*linux*]
 	     || [istarget s390*-*-*] 
@@ -5758,6 +5779,8 @@ proc check_effective_target_sync_char_short { } {
 	     || [istarget i?86-*-*] || [istarget x86_64-*-*]
 	     || [istarget alpha*-*-*] 
 	     || [istarget arm*-*-linux-*] 
+	     || ([istarget arm*-*-*]
+		 && [check_effective_target_arm_acq_rel])
 	     || [istarget hppa*-*linux*]
 	     || [istarget s390*-*-*] 
 	     || [istarget powerpc*-*-*]