fast sk4f <-> sk4i SSE methods

tests/SkNxTest.cpp

 /*
  * Copyright 2015 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "Sk4px.h"
 #include "SkNx.h"
 #include "SkRandom.h"
@@ skipping 219 matching lines @@
     REPORTER_ASSERT(r, f2[0] == 20);
     REPORTER_ASSERT(r, f2[1] == 10);
 
     f4 = SkNx_shuffle<0,1,1,0>(f2);
     REPORTER_ASSERT(r, f4[0] == 20);
     REPORTER_ASSERT(r, f4[1] == 10);
     REPORTER_ASSERT(r, f4[2] == 10);
     REPORTER_ASSERT(r, f4[3] == 20);
 }
 
+DEF_TEST(SkNx_int_float, r) {
+    Sk4f f(-2.3f, 1.0f, 0.45f, 0.6f);
+
+    Sk4i i = SkNx_cast<int>(f);
+    REPORTER_ASSERT(r, i[0] == -2);
+    REPORTER_ASSERT(r, i[1] ==  1);
+    REPORTER_ASSERT(r, i[2] ==  0);
+    REPORTER_ASSERT(r, i[3] ==  0);
+
+    f = SkNx_cast<float>(i);
+    REPORTER_ASSERT(r, f[0] == -2.0f);
+    REPORTER_ASSERT(r, f[1] ==  1.0f);
+    REPORTER_ASSERT(r, f[2] ==  0.0f);
+    REPORTER_ASSERT(r, f[3] ==  0.0f);
+}
+
 #include "SkRandom.h"
 
 DEF_TEST(SkNx_u16_float, r) {
     {
         // u16 --> float
         auto h4 = Sk4h(15, 17, 257, 65535);
         auto f4 = SkNx_cast<float>(h4);
         REPORTER_ASSERT(r, f4.kth<0>() == 15.0f);
         REPORTER_ASSERT(r, f4.kth<1>() == 17.0f);
         REPORTER_ASSERT(r, f4.kth<2>() == 257.0f);
@@ skipping 18 matching lines @@
             (uint16_t)rand.nextU16(), (uint16_t)rand.nextU16(),
         };
         auto u4_0 = Sk4h::Load(s16);
         auto f4 = SkNx_cast<float>(u4_0);
         auto u4_1 = SkNx_cast<uint16_t>(f4);
         uint16_t d16[4];
         u4_1.store(d16);
         REPORTER_ASSERT(r, !memcmp(s16, d16, sizeof(s16)));
     }
 }