test cse for emulated TLS targets.

	* lib/target-supports.exp (check_effective_target_tls_emulated): New.
	* gcc.dg/tls/thr-cse-1.c: New.

From-SVN: r163330

gcc/testsuite/ChangeLog

 2010-08-18  Iain Sandoe  <iains@gcc.gnu.org>
 
+	* lib/target-supports.exp (check_effective_target_tls_emulated): New.
+	* gcc.dg/tls/thr-cse-1.c: New.
+
+2010-08-18  Iain Sandoe  <iains@gcc.gnu.org>
+
 	PR debug/42487
 	* lib/target-supports.exp
 	(check_effective_target_function_sections): New.

gcc/testsuite/gcc.dg/tls/thr-cse-1.c

+/* { dg-do compile } */
+/* { dg-options "-O1" } */
+/* { dg-require-effective-target tls_emulated } */
+
+/* Test that we only get one call to emutls_get_address when CSE is
+   active.  Note that the var _must_ be initialized for the scan asm
+   to work, since otherwise there will be an initializer which will,
+   correctly, call emutls_get_address.  */
+int foo (int b, int c, int d)
+{
+  static __thread int a=1;
+  a += b;
+  a -= c;
+  a += d;
+  return a;
+}
+
+/* { dg-final { scan-assembler-not "emutls_get_address.*emutls_get_address.*" { target { { ! "*-wrs-vxworks" } && { ! "*-*-darwin8" } } } } } */
+/* { dg-final { scan-assembler-not "call\tL___emutls_get_address.stub.*call\tL___emutls_get_address.stub.*" { target "*-*-darwin8" } } } */
+/* { dg-final { scan-assembler-not "tls_lookup.*tls_lookup.*" { target *-wrs-vxworks } } } */
+

gcc/testsuite/lib/target-supports.exp

@@ -614,6 +614,23 @@ proc check_effective_target_tls_native {} {
     }]
 }
 
+# Return 1 if *emulated* thread local storage (TLS) is supported, 0 otherwise.
+
+proc check_effective_target_tls_emulated {} {
+    # VxWorks uses emulated TLS machinery, but with non-standard helper
+    # functions, so we fail to automatically detect it.
+    global target_triplet
+    if { [regexp ".*-.*-vxworks.*" $target_triplet] } {
+	return 1
+    }
+    
+    return [check_no_messages_and_pattern tls_emulated "emutls" assembly {
+	__thread int i;
+	int f (void) { return i; }
+	void g (int j) { i = j; }
+    }]
+}
+
 # Return 1 if TLS executables can run correctly, 0 otherwise.
 
 proc check_effective_target_tls_runtime {} {