document cpuid command line behavior

unit_test/unit_test.cc

 /*
  *  Copyright 2011 The LibYuv Project Authors. All rights reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS. All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
 #include "../unit_test/unit_test.h"
 
 #include <stdlib.h>  // For getenv()
 
 #include <cstring>
 
 #include "gflags/gflags.h"
 
 // Change this to 1000 for benchmarking.
 // TODO(fbarchard): Add command line parsing to pass this as option.
 #define BENCHMARK_ITERATIONS 1
 
 unsigned int fastrand_seed = 0xfb;
 
 DEFINE_int32(libyuv_width, 0, "width of test image.");
 DEFINE_int32(libyuv_height, 0, "height of test image.");
 DEFINE_int32(libyuv_repeat, 0, "number of times to repeat test.");
-DEFINE_int32(libyuv_flags, 0, "cpu flags for reference code. 0 = C -1 = asm");
-DEFINE_int32(libyuv_cpu_info, -1,
-             "cpu flags for benchmark code. -1 = SIMD, 1 = C");
+DEFINE_int32(libyuv_flags, 0,
+             "cpu flags for reference code. 1 = C, -1 = SIMD");
+DEFINE_int32(libyuv_cpu_info, 0,
+             "cpu flags for benchmark code. 1 = C, -1 = SIMD");
 
 // For quicker unittests, default is 128 x 72.  But when benchmarking,
 // default to 720p.  Allow size to specify.
 // Set flags to -1 for benchmarking to avoid slower C code.
 
 LibYUVConvertTest::LibYUVConvertTest() :
     benchmark_iterations_(BENCHMARK_ITERATIONS), benchmark_width_(128),
     benchmark_height_(72), disable_cpu_flags_(1), benchmark_cpu_info_(-1) {
   const char* repeat = getenv("LIBYUV_REPEAT");
   if (repeat) {
@@ skipping 305 matching lines @@
 }
 
 int main(int argc, char** argv) {
   ::testing::InitGoogleTest(&argc, argv);
   // AllowCommandLineParsing allows us to ignore flags passed on to us by
   // Chromium build bots without having to explicitly disable them.
   google::AllowCommandLineReparsing();
   google::ParseCommandLineFlags(&argc, &argv, true);
   return RUN_ALL_TESTS();
 }