Support the tls_model attribute (PR9788)

This adds support for the tls_model attribute. This allows the user to
choose a TLS model that is better than what LLVM would select by
default. For example, a variable might be declared as:

  __thread int x __attribute__((tls_model("initial-exec")));

if it will not be used in a shared library that is dlopen'ed.

This depends on LLVM r159077.

llvm-svn: 159078

1 files changed, 15 insertions, 0 deletions

diff --git a/clang/test/CodeGen/thread-specifier.c b/clang/test/CodeGen/thread-specifier.c
index a1f3e168000..a2d3e62c8c5 100644
--- a/clang/test/CodeGen/thread-specifier.c
+++ b/clang/test/CodeGen/thread-specifier.c
@@ -3,7 +3,13 @@
 // CHECK: @b = external thread_local global
 // CHECK: @d.e = internal thread_local global
 // CHECK: @d.f = internal thread_local global
+// CHECK: @f.a = internal thread_local(initialexec) global
 // CHECK: @a = thread_local global
+// CHECK: @g = thread_local global
+// CHECK: @h = thread_local(localdynamic) global
+// CHECK: @i = thread_local(initialexec) global
+// CHECK: @j = thread_local(localexec) global
+
 __thread int a;
 extern __thread int b;
 int c() { return *&b; }
@@ -13,3 +19,12 @@ int d() {
   return 0;
 }
 
+__thread int g __attribute__((tls_model("global-dynamic")));
+__thread int h __attribute__((tls_model("local-dynamic")));
+__thread int i __attribute__((tls_model("initial-exec")));
+__thread int j __attribute__((tls_model("local-exec")));
+
+int f() {
+  __thread static int a __attribute__((tls_model("initial-exec")));
+  return a++;
+}