Declares __cpu_model as dso local

__builtin_cpu_supports and __builtin_cpu_is use information in __cpu_model to decide cpu features. Before this change, __cpu_model was not declared as dso local. The generated code looks up the address in GOT when reading __cpu_model. This makes it impossible to use these functions in ifunc, because at that time GOT entries have not been relocated. This change makes it dso local.

Differential Revision: https://reviews.llvm.org/D53850

llvm-svn: 349825

2 files changed, 7 insertions, 0 deletions

diff --git a/clang/test/CodeGen/builtin-cpu-is.c b/clang/test/CodeGen/builtin-cpu-is.c
index f2a5f54a0c8..bff3544c136 100644
--- a/clang/test/CodeGen/builtin-cpu-is.c
+++ b/clang/test/CodeGen/builtin-cpu-is.c
@@ -4,6 +4,8 @@
 // global, the bit grab, and the icmp correct.
 extern void a(const char *);
 
+// CHECK: @__cpu_model = external dso_local global { i32, i32, i32, [1 x i32] }
+
 void intel() {
   if (__builtin_cpu_is("intel"))
     a("intel");
diff --git a/clang/test/CodeGen/builtin-cpu-supports.c b/clang/test/CodeGen/builtin-cpu-supports.c
index d384efbc208..761f00cf957 100644
--- a/clang/test/CodeGen/builtin-cpu-supports.c
+++ b/clang/test/CodeGen/builtin-cpu-supports.c
@@ -4,6 +4,9 @@
 // global, the bit grab, and the icmp correct.
 extern void a(const char *);
 
+// CHECK: @__cpu_model = external dso_local global { i32, i32, i32, [1 x i32] }
+// CHECK: @__cpu_features2 = external dso_local global i32
+
 int main() {
   __builtin_cpu_init();
 
@@ -25,3 +28,5 @@ int main() {
 
   return 0;
 }
+
+// CHECK: declare dso_local void @__cpu_indicator_init()