Added ClearSystemState in a unit test

There is another unit test that has been failing randomly on win32
build. Investigation has shown that the failure was caused by simd
register state is not reset appropriately in the fdct8x8 test. This
commit added ClearSystemState() in the teardown of this test, tests
showed it resolved the random failure issue for win32 build.

Related issue: https://code.google.com/p/webm/issues/detail?id=614

Change-Id: I9381d0c1a6f4b855ccaeef1aca8c417ac8c71ee2

test/fdct8x8_test.cc

@@ -13,14 +13,16 @@
 #include <string.h>
 
 #include "third_party/googletest/src/include/gtest/gtest.h"
+#include "test/clear_system_state.h"
+#include "test/register_state_check.h"
 #include "vpx_ports/mem.h"
 
 extern "C" {
-#include "vp9_rtcd.h"
-void vp9_short_idct8x8_add_c(short *input, uint8_t *output, int pitch);
+#include "./vp9_rtcd.h"
+void vp9_short_idct8x8_add_c(int16_t *input, uint8_t *output, int pitch);
 }
 
-#include "acm_random.h"
+#include "test/acm_random.h"
 #include "vpx/vpx_integer.h"
 
 using libvpx_test::ACMRandom;
@@ -62,6 +64,7 @@ class FwdTrans8x8Test : public ::testing::TestWithParam<int> {
       inv_txfm = iht8x8_add;
     }
   }
+  virtual void TearDown() { libvpx_test::ClearSystemState(); }
 
  protected:
   void RunFwdTxfm(int16_t *in, int16_t *out, uint8_t *dst,
@@ -92,8 +95,9 @@ TEST_P(FwdTrans8x8Test, SignBiasCheck) {
     // Initialize a test block with input range [-255, 255].
     for (int j = 0; j < 64; ++j)
       test_input_block[j] = rnd.Rand8() - rnd.Rand8();
-
-    RunFwdTxfm(test_input_block, test_output_block, NULL, pitch, tx_type_);
+    REGISTER_STATE_CHECK(
+        RunFwdTxfm(test_input_block, test_output_block,
+                   NULL, pitch, tx_type_));
 
     for (int j = 0; j < 64; ++j) {
       if (test_output_block[j] < 0)
@@ -121,8 +125,9 @@ TEST_P(FwdTrans8x8Test, SignBiasCheck) {
     // Initialize a test block with input range [-15, 15].
     for (int j = 0; j < 64; ++j)
       test_input_block[j] = (rnd.Rand8() >> 4) - (rnd.Rand8() >> 4);
-
-    RunFwdTxfm(test_input_block, test_output_block, NULL, pitch, tx_type_);
+    REGISTER_STATE_CHECK(
+        RunFwdTxfm(test_input_block, test_output_block,
+                   NULL, pitch, tx_type_));
 
     for (int j = 0; j < 64; ++j) {
       if (test_output_block[j] < 0)
@@ -165,9 +170,11 @@ TEST_P(FwdTrans8x8Test, RoundTripErrorCheck) {
       test_input_block[j] = src[j] - dst[j];
 
     const int pitch = 16;
-    RunFwdTxfm(test_input_block, test_temp_block, dst, pitch, tx_type_);
-    for (int j = 0; j < 64; ++j){
-        if(test_temp_block[j] > 0) {
+    REGISTER_STATE_CHECK(
+        RunFwdTxfm(test_input_block, test_temp_block,
+                   dst, pitch, tx_type_));
+    for (int j = 0; j < 64; ++j) {
+        if (test_temp_block[j] > 0) {
           test_temp_block[j] += 2;
           test_temp_block[j] /= 4;
           test_temp_block[j] *= 4;
@@ -177,7 +184,9 @@ TEST_P(FwdTrans8x8Test, RoundTripErrorCheck) {
           test_temp_block[j] *= 4;
         }
     }
-    RunInvTxfm(test_input_block, test_temp_block, dst, pitch, tx_type_);
+    REGISTER_STATE_CHECK(
+        RunInvTxfm(test_input_block, test_temp_block,
+                   dst, pitch, tx_type_));
 
     for (int j = 0; j < 64; ++j) {
       const int diff = dst[j] - src[j];
@@ -216,8 +225,12 @@ TEST_P(FwdTrans8x8Test, ExtremalCheck) {
       test_input_block[j] = src[j] - dst[j];
 
     const int pitch = 16;
-    RunFwdTxfm(test_input_block, test_temp_block, dst, pitch, tx_type_);
-    RunInvTxfm(test_input_block, test_temp_block, dst, pitch, tx_type_);
+    REGISTER_STATE_CHECK(
+        RunFwdTxfm(test_input_block, test_temp_block,
+                   dst, pitch, tx_type_));
+    REGISTER_STATE_CHECK(
+        RunInvTxfm(test_input_block, test_temp_block,
+                   dst, pitch, tx_type_));
 
     for (int j = 0; j < 64; ++j) {
       const int diff = dst[j] - src[j];