Define __GCC_ATOMIC_TEST_AND_SET_TRUEVAL

        * target.def (TARGET_ATOMIC_TEST_AND_SET_TRUEVAL): New.
        * c-cppbuiltin.c (cpp_atomic_builtins): Define
        __GCC_ATOMIC_TEST_AND_SET_TRUEVAL.
        * doc/tm.texi.in (TARGET_ATOMIC_TEST_AND_SET_TRUEVAL): Add doc hook.
        * doc/tm.texi: Rebuild.

From-SVN: r183581

gcc/ChangeLog

 2012-01-27  Richard Henderson  <rth@redhat.com>
 
+	* target.def (TARGET_ATOMIC_TEST_AND_SET_TRUEVAL): New.
+	* c-cppbuiltin.c (cpp_atomic_builtins): Define
+	__GCC_ATOMIC_TEST_AND_SET_TRUEVAL.
+	* doc/tm.texi.in (TARGET_ATOMIC_TEST_AND_SET_TRUEVAL): Add doc hook.
+	* doc/tm.texi: Rebuild.
+
+2012-01-27  Richard Henderson  <rth@redhat.com>
+
 	* optabs.c (gen_atomic_test_and_set): Remove default.
 	(maybe_emit_atomic_test_and_set): Use maybe_expand_insn.
 

gcc/c-family/c-cppbuiltin.c

@@ -670,6 +670,11 @@ cpp_atomic_builtins (cpp_reader *pfile)
   builtin_define_with_int_value ("__GCC_ATOMIC_LLONG_LOCK_FREE", 
 		(have_swap[SWAP_INDEX (long_long_integer_type_node)]? 2 : 1));
 
+  /* If we're dealing with a "set" value that doesn't exactly correspond
+     to a boolean truth value, let the library work around that.  */
+  builtin_define_with_int_value ("__GCC_ATOMIC_TEST_AND_SET_TRUEVAL",
+				 targetm.atomic_test_and_set_trueval);
+
   /* ptr_type_node can't be used here since ptr_mode is only set when
      toplev calls backend_init which is not done with -E  or pch.  */
   psize = POINTER_SIZE / BITS_PER_UNIT;

gcc/doc/tm.texi

@@ -11359,3 +11359,7 @@ value of @code{TARGET_CONST_ANCHOR} is a power of 2.  For example, on
 MIPS, where add-immediate takes a 16-bit signed value,
 @code{TARGET_CONST_ANCHOR} is set to @samp{0x8000}.  The default value
 is zero, which disables this optimization.  @end deftypevr
+
+@deftypevr {Target Hook} {unsigned char} TARGET_ATOMIC_TEST_AND_SET_TRUEVAL
+This value should be set if the result written by @code{atomic_test_and_set} is not exactly 1, i.e. the @code{bool} @code{true}.
+@end deftypevr

gcc/doc/tm.texi.in

@@ -11237,3 +11237,5 @@ value of @code{TARGET_CONST_ANCHOR} is a power of 2.  For example, on
 MIPS, where add-immediate takes a 16-bit signed value,
 @code{TARGET_CONST_ANCHOR} is set to @samp{0x8000}.  The default value
 is zero, which disables this optimization.  @end deftypevr
+
+@hook TARGET_ATOMIC_TEST_AND_SET_TRUEVAL

gcc/target.def

@@ -2667,6 +2667,13 @@ DEFHOOK
  enum unwind_info_type, (void),
  default_debug_unwind_info)
 
+DEFHOOKPOD
+(atomic_test_and_set_trueval,
+ "This value should be set if the result written by\
+ @code{atomic_test_and_set} is not exactly 1, i.e. the\
+ @code{bool} @code{true}.",
+ unsigned char, 1)
+ 
 /* Leave the boolean fields at the end.  */
 
 /* True if we can create zeroed data by switching to a BSS section