Vendor import of clang trunk r256633:

https://llvm.org/svn/llvm-project/cfe/trunk@256633

1 files changed, 46 insertions, 0 deletions

diff --git a/test/CodeGen/builtin-unpredictable.c b/test/CodeGen/builtin-unpredictable.c
new file mode 100644
index 0000000..653f231
--- /dev/null
+++ b/test/CodeGen/builtin-unpredictable.c
@@ -0,0 +1,46 @@
+// RUN: %clang_cc1 -triple x86_64-unknown-unknown -emit-llvm -disable-llvm-optzns -o - %s -O1 | FileCheck %s
+// RUN: %clang_cc1 -triple x86_64-unknown-unknown -emit-llvm -o - %s -O0 | FileCheck %s --check-prefix=CHECK_O0
+
+// When optimizing, the builtin should be converted to metadata.
+// When not optimizing, there should be no metadata created for the builtin.
+// In both cases, the builtin should be removed from the code.
+
+void foo();
+void branch(int x) {
+// CHECK-LABEL: define void @branch(
+
+// CHECK-NOT: builtin_unpredictable
+// CHECK: !unpredictable [[METADATA:.+]]
+
+// CHECK_O0-NOT: builtin_unpredictable
+// CHECK_O0-NOT: !unpredictable 
+
+  if (__builtin_unpredictable(x > 0))
+    foo ();
+}
+
+int unpredictable_switch(int x) {
+// CHECK-LABEL: @unpredictable_switch(
+
+// CHECK-NOT: builtin_unpredictable
+// CHECK: !unpredictable [[METADATA:.+]]
+
+// CHECK_O0-NOT: builtin_unpredictable
+// CHECK_O0-NOT: !unpredictable 
+
+  switch(__builtin_unpredictable(x)) {
+  default:
+    return 0;
+  case 0:
+  case 1:
+  case 2:
+    return 1;
+  case 5:
+    return 5;
+  };
+
+  return 0;
+}
+
+// CHECK: [[METADATA]] = !{}
+