diff --git a/test/tools/llvm-cov/copy_block_helper.m b/test/tools/llvm-cov/copy_block_helper.m
index 64973f11009..d8202d085b2 100644
--- a/test/tools/llvm-cov/copy_block_helper.m
+++ b/test/tools/llvm-cov/copy_block_helper.m
@@ -9,7 +9,7 @@
 // RUN: cd %t
 // RUN: cp %s %p/Inputs/copy_block_helper.gc* .
 
-// RUN: llvm-cov copy_block_helper.m | FileCheck %s --check-prefix=STDOUT
+// RUN: llvm-cov gcov copy_block_helper.m | FileCheck %s --check-prefix=STDOUT
 // STDOUT: File 'copy_block_helper.m'
 // STDOUT: Lines executed:100.00% of 5
 // STDOUT: copy_block_helper.m:creating 'copy_block_helper.m.gcov'
diff --git a/test/tools/llvm-cov/llvm-cov.test b/test/tools/llvm-cov/llvm-cov.test
index ad4ceefbbce..ba5e18a9106 100644
--- a/test/tools/llvm-cov/llvm-cov.test
+++ b/test/tools/llvm-cov/llvm-cov.test
@@ -11,70 +11,70 @@ RUN: cd %t
 RUN: cp %p/Inputs/test* .
 
 # Basic behaviour with no flags
-RUN: llvm-cov test.c | diff -u test_no_options.output -
+RUN: llvm-cov gcov test.c | diff -u test_no_options.output -
 RUN: diff -aub test_no_options.cpp.gcov test.cpp.gcov
 RUN: diff -aub test_no_options.h.gcov test.h.gcov
 
 # Same, but specifying the object directory
 RUN: mkdir -p %t/objdir
 RUN: cp test.gcno test.gcda %t/objdir
-RUN: llvm-cov -o objdir test.c | diff -u test_no_options.output -
+RUN: llvm-cov gcov -o objdir test.c | diff -u test_no_options.output -
 RUN: diff -aub test_objdir.cpp.gcov test.cpp.gcov
 RUN: diff -aub test_objdir.h.gcov test.h.gcov
 
 # Specifying an object file
-RUN: llvm-cov -o objdir/test.o test.c | diff -u test_no_options.output -
+RUN: llvm-cov gcov -o objdir/test.o test.c | diff -u test_no_options.output -
 RUN: diff -aub test_objdir.cpp.gcov test.cpp.gcov
 RUN: diff -aub test_objdir.h.gcov test.h.gcov
 
 # Specifying an object file that could be ambiguous with a directory
-RUN: llvm-cov -o objdir/test test.c | diff -u test_no_options.output -
+RUN: llvm-cov gcov -o objdir/test test.c | diff -u test_no_options.output -
 RUN: diff -aub test_objdir.cpp.gcov test.cpp.gcov
 RUN: diff -aub test_objdir.h.gcov test.h.gcov
 
 # With gcov output disabled
-RUN: llvm-cov -n test.c | diff -u test_no_output.output -
+RUN: llvm-cov gcov -n test.c | diff -u test_no_output.output -
 
 # Missing source files. This test is fragile, as it depends on being
 # run before we copy some sources into place in the next test.
-RUN: llvm-cov test_paths.cpp 2>/dev/null | diff -u test_missing.output -
+RUN: llvm-cov gcov test_paths.cpp 2>/dev/null | diff -u test_missing.output -
 RUN: diff -aub test_missing.cpp.gcov test.cpp.gcov
 RUN: diff -aub test_missing.h.gcov test.h.gcov
 
 # Preserve paths. This mangles the output filenames.
 RUN: mkdir -p %t/srcdir/nested_dir
 RUN: cp test.cpp test.h %t/srcdir
-RUN: llvm-cov -p test_paths.cpp | diff -u test_preserve_paths.output -
+RUN: llvm-cov gcov -p test_paths.cpp | diff -u test_preserve_paths.output -
 RUN: diff -aub test_paths.cpp.gcov srcdir#nested_dir#^#test.cpp.gcov
 RUN: diff -aub test_paths.h.gcov srcdir#nested_dir#^#test.h.gcov
 
 # Don't preserve paths. Same results as preserve paths, but no mangling.
-RUN: llvm-cov test_paths.cpp | diff -u test_no_preserve_paths.output -
+RUN: llvm-cov gcov test_paths.cpp | diff -u test_no_preserve_paths.output -
 RUN: diff -aub test_paths.cpp.gcov test.cpp.gcov
 RUN: diff -aub test_paths.h.gcov test.h.gcov
 
 # Long file names.
-RUN: llvm-cov -l test_paths.cpp | diff -u test_long_file_names.output -
+RUN: llvm-cov gcov -l test_paths.cpp | diff -u test_long_file_names.output -
 RUN: diff -aub test_paths.cpp.gcov test_paths.cpp##test.cpp.gcov
 RUN: diff -aub test_paths.h.gcov test_paths.cpp##test.h.gcov
 
 # Long file names and preserve paths.
-RUN: llvm-cov -lp -gcno test_paths.gcno -gcda test_paths.gcda srcdir/../test_paths.cpp | diff -u test_long_paths.output -
+RUN: llvm-cov gcov -lp -gcno test_paths.gcno -gcda test_paths.gcda srcdir/../test_paths.cpp | diff -u test_long_paths.output -
 RUN: diff -aub test_paths.cpp.gcov srcdir#^#test_paths.cpp##srcdir#nested_dir#^#test.cpp.gcov
 RUN: diff -aub test_paths.h.gcov srcdir#^#test_paths.cpp##srcdir#nested_dir#^#test.h.gcov
 
 # Function summaries. This changes stdout, but not the gcov files.
-RUN: llvm-cov test.c -f | diff -u test_-f.output -
+RUN: llvm-cov gcov test.c -f | diff -u test_-f.output -
 RUN: diff -aub test_no_options.cpp.gcov test.cpp.gcov
 RUN: diff -aub test_no_options.h.gcov test.h.gcov
 
 # All blocks. This doesn't affect stdout, only the gcov files.
-RUN: llvm-cov test.c -a | diff -u test_no_options.output -
+RUN: llvm-cov gcov test.c -a | diff -u test_no_options.output -
 RUN: diff -aub test_-a.cpp.gcov test.cpp.gcov
 RUN: diff -aub test_-a.h.gcov test.h.gcov
 
 # Branch probabilities.
-RUN: llvm-cov test.c -a -b | diff -u test_-b.output -
+RUN: llvm-cov gcov test.c -a -b | diff -u test_-b.output -
 RUN: diff -aub test_-a_-b.cpp.gcov test.cpp.gcov
 RUN: diff -aub test_-a_-b.h.gcov test.h.gcov
 
@@ -83,36 +83,36 @@ RUN: diff -aub test_-a_-b.h.gcov test.h.gcov
 # FIXME: We don't correctly handle calls when -b and -f are used
 # together, so our output differs from gcov. Remove the 'not' from
 # this test once this is fixed.
-RUN: llvm-cov test.c -a -b -f | not diff -u test_-b_-f.output - >/dev/null
+RUN: llvm-cov gcov test.c -a -b -f | not diff -u test_-b_-f.output - >/dev/null
 RUN: diff -aub test_-a_-b.cpp.gcov test.cpp.gcov
 RUN: diff -aub test_-a_-b.h.gcov test.h.gcov
 
 # Summarize unconditional branches too.
-RUN: llvm-cov test.c -a -b -u | diff -u test_-b.output -
+RUN: llvm-cov gcov test.c -a -b -u | diff -u test_-b.output -
 RUN: diff -aub test_-a_-b_-u.cpp.gcov test.cpp.gcov
 RUN: diff -aub test_-a_-b_-u.h.gcov test.h.gcov
 
 # Absolute counts for branches.
-RUN: llvm-cov test.c -a -b -c -u | diff -u test_-b.output -
+RUN: llvm-cov gcov test.c -a -b -c -u | diff -u test_-b.output -
 RUN: diff -aub test_-a_-b_-c_-u.cpp.gcov test.cpp.gcov
 RUN: diff -aub test_-a_-b_-c_-u.h.gcov test.h.gcov
 
 # Missing gcda file just gives 0 counts.
-RUN: llvm-cov test.c -gcda=no_such_gcda_file | diff -u test_no_gcda.output -
+RUN: llvm-cov gcov test.c -gcda=no_such_gcda_file | diff -u test_no_gcda.output -
 RUN: diff -aub test_no_gcda.cpp.gcov test.cpp.gcov
 RUN: diff -aub test_no_gcda.h.gcov test.h.gcov
 
 # Invalid gcno file.
-RUN: llvm-cov test.c -gcno=test_read_fail.gcno
+RUN: llvm-cov gcov test.c -gcno=test_read_fail.gcno
 
 # Bad file checksum on gcda.
-RUN: llvm-cov test.c -gcda=test_file_checksum_fail.gcda
+RUN: llvm-cov gcov test.c -gcda=test_file_checksum_fail.gcda
 
 # Bad function checksum on gcda
-RUN: llvm-cov test.c -gcda=test_func_checksum_fail.gcda
+RUN: llvm-cov gcov test.c -gcda=test_func_checksum_fail.gcda
 
 # Has arcs from exit blocks
-RUN: llvm-cov test_exit_block_arcs.c 2>&1 | FileCheck %s -check-prefix=EXIT_BLOCK_ARCS
+RUN: llvm-cov gcov test_exit_block_arcs.c 2>&1 | FileCheck %s -check-prefix=EXIT_BLOCK_ARCS
 EXIT_BLOCK_ARCS: (main) has arcs from exit block.
 
 XFAIL: powerpc64-, s390x, mips-, mips64-, sparc
diff --git a/test/tools/llvm-cov/range_based_for.cpp b/test/tools/llvm-cov/range_based_for.cpp
index 3fdb2441399..6f7a11ad634 100644
--- a/test/tools/llvm-cov/range_based_for.cpp
+++ b/test/tools/llvm-cov/range_based_for.cpp
@@ -9,7 +9,7 @@
 // RUN: cd %t
 // RUN: cp %s %p/Inputs/range_based_for.gc* .
 
-// RUN: llvm-cov range_based_for.cpp | FileCheck %s --check-prefix=STDOUT
+// RUN: llvm-cov gcov range_based_for.cpp | FileCheck %s --check-prefix=STDOUT
 // STDOUT: File 'range_based_for.cpp'
 // STDOUT: Lines executed:100.00% of 5
 // STDOUT: range_based_for.cpp:creating 'range_based_for.cpp.gcov'
diff --git a/tools/llvm-cov/llvm-cov.cpp b/tools/llvm-cov/llvm-cov.cpp
index 3b7cffc8413..bf66f583a52 100644
--- a/tools/llvm-cov/llvm-cov.cpp
+++ b/tools/llvm-cov/llvm-cov.cpp
@@ -14,6 +14,7 @@
 #include "llvm/ADT/StringRef.h"
 #include "llvm/ADT/StringSwitch.h"
 #include "llvm/Support/Path.h"
+#include "llvm/Support/Process.h"
 #include "llvm/Support/raw_ostream.h"
 #include <string>
 
@@ -33,8 +34,12 @@ int gcovMain(int argc, const char *argv[]);
 
 /// \brief Top level help.
 static int helpMain(int argc, const char *argv[]) {
-  errs() << "OVERVIEW: LLVM code coverage tool\n\n"
-         << "USAGE: llvm-cov {gcov|report|show}\n";
+  errs() << "Usage: llvm-cov {gcov|report|show} [OPTION]...\n\n"
+         << "Shows code coverage information.\n\n"
+         << "Subcommands:\n"
+         << "  gcov:   Work with the gcov format.\n"
+         << "  show:   Annotate source files using instrprof style coverage.\n"
+         << "  report: Summarize instrprof style coverage information.\n";
   return 0;
 }
 
@@ -61,18 +66,13 @@ int main(int argc, const char **argv) {
     }
   }
 
-  // Give a warning and fall back to gcov
-  errs().changeColor(raw_ostream::RED);
-  errs() << "warning:";
-  // Assume that argv[1] wasn't a command when it stats with a '-' or is a
-  // filename (i.e. contains a '.')
-  if (argc > 1 && !StringRef(argv[1]).startswith("-") &&
-      StringRef(argv[1]).find(".") == StringRef::npos)
-    errs() << " Unrecognized command '" << argv[1] << "'.";
-  errs() << " Using the gcov compatible mode "
-            "(this behaviour may be dropped in the future).";
-  errs().resetColor();
-  errs() << "\n";
-
-  return gcovMain(argc, argv);
+  if (argc > 1) {
+    if (sys::Process::StandardErrHasColors())
+      errs().changeColor(raw_ostream::RED);
+    errs() << "Unrecognized command: " << argv[1] << ".\n\n";
+    if (sys::Process::StandardErrHasColors())
+      errs().resetColor();
+  }
+  helpMain(argc, argv);
+  return 1;
 }