diff --git a/clang/include/clang/Driver/Options.td b/clang/include/clang/Driver/Options.td
--- a/clang/include/clang/Driver/Options.td
+++ b/clang/include/clang/Driver/Options.td
@@ -3297,9 +3297,9 @@
 defm tls_model : BooleanFFlag<"tls-model">, Group<clang_ignored_f_Group>;
 defm tracer : BooleanFFlag<"tracer">, Group<clang_ignored_gcc_optimization_f_Group>;
 defm tree_dce : BooleanFFlag<"tree-dce">, Group<clang_ignored_gcc_optimization_f_Group>;
-defm tree_loop_im : BooleanFFlag<"tree_loop_im">,  Group<clang_ignored_gcc_optimization_f_Group>;
-defm tree_loop_ivcanon : BooleanFFlag<"tree_loop_ivcanon">,  Group<clang_ignored_gcc_optimization_f_Group>;
-defm tree_loop_linear : BooleanFFlag<"tree_loop_linear">,  Group<clang_ignored_gcc_optimization_f_Group>;
+defm tree_loop_im : BooleanFFlag<"tree-loop-im">,  Group<clang_ignored_gcc_optimization_f_Group>;
+defm tree_loop_ivcanon : BooleanFFlag<"tree-loop-ivcanon">,  Group<clang_ignored_gcc_optimization_f_Group>;
+defm tree_loop_linear : BooleanFFlag<"tree-loop-linear">,  Group<clang_ignored_gcc_optimization_f_Group>;
 defm tree_salias : BooleanFFlag<"tree-salias">, Group<clang_ignored_f_Group>;
 defm tree_ter : BooleanFFlag<"tree-ter">, Group<clang_ignored_gcc_optimization_f_Group>;
 defm tree_vectorizer_verbose : BooleanFFlag<"tree-vectorizer-verbose">, Group<clang_ignored_f_Group>;
diff --git a/clang/test/Driver/clang_f_opts.c b/clang/test/Driver/clang_f_opts.c
--- a/clang/test/Driver/clang_f_opts.c
+++ b/clang/test/Driver/clang_f_opts.c
@@ -292,9 +292,9 @@
 // RUN:     -frename-registers                                                \
 // RUN:     -fschedule-insns2                                                 \
 // RUN:     -fsingle-precision-constant                                       \
-// RUN:     -ftree_loop_im                                                    \
-// RUN:     -ftree_loop_ivcanon                                               \
-// RUN:     -ftree_loop_linear                                                \
+// RUN:     -ftree-loop-im                                                    \
+// RUN:     -ftree-loop-ivcanon                                               \
+// RUN:     -ftree-loop-linear                                                \
 // RUN:     -funsafe-loop-optimizations                                       \
 // RUN:     -fuse-linker-plugin                                               \
 // RUN:     -fvect-cost-model                                                 \
@@ -432,9 +432,9 @@
 // CHECK-WARNING-DAG: optimization flag '-frename-registers' is not supported
 // CHECK-WARNING-DAG: optimization flag '-fschedule-insns2' is not supported
 // CHECK-WARNING-DAG: optimization flag '-fsingle-precision-constant' is not supported
-// CHECK-WARNING-DAG: optimization flag '-ftree_loop_im' is not supported
-// CHECK-WARNING-DAG: optimization flag '-ftree_loop_ivcanon' is not supported
-// CHECK-WARNING-DAG: optimization flag '-ftree_loop_linear' is not supported
+// CHECK-WARNING-DAG: optimization flag '-ftree-loop-im' is not supported
+// CHECK-WARNING-DAG: optimization flag '-ftree-loop-ivcanon' is not supported
+// CHECK-WARNING-DAG: optimization flag '-ftree-loop-linear' is not supported
 // CHECK-WARNING-DAG: optimization flag '-funsafe-loop-optimizations' is not supported
 // CHECK-WARNING-DAG: optimization flag '-fuse-linker-plugin' is not supported
 // CHECK-WARNING-DAG: optimization flag '-fvect-cost-model' is not supported