tests/SkVxTest.cpp - skia - Git at Google

 /*
  * Copyright 2019 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */

 #include "include/core/SkPoint.h"
 #include "src/base/SkRandom.h"
 #include "src/base/SkVx.h"
 #include "tests/Test.h"

 #include <numeric>

 namespace skvx {

 DEF_TEST(SkVx, r) {
     static_assert(sizeof(float2) ==  8, "");
     static_assert(sizeof(float4) == 16, "");
     static_assert(sizeof(float8) == 32, "");

     static_assert(sizeof(byte2) == 2, "");
     static_assert(sizeof(byte4) == 4, "");
     static_assert(sizeof(byte8) == 8, "");

     {
         int4 mask = float4{1,2,3,4} < float4{1,2,4,8};
         REPORTER_ASSERT(r, mask[0] == int32_t( 0));
         REPORTER_ASSERT(r, mask[1] == int32_t( 0));
         REPORTER_ASSERT(r, mask[2] == int32_t(-1));
         REPORTER_ASSERT(r, mask[3] == int32_t(-1));

         REPORTER_ASSERT(r,  any(mask));
         REPORTER_ASSERT(r, !all(mask));
     }

     {
         long4 mask = double4{1,2,3,4} < double4{1,2,4,8};
         REPORTER_ASSERT(r, mask[0] == int64_t( 0));
         REPORTER_ASSERT(r, mask[1] == int64_t( 0));
         REPORTER_ASSERT(r, mask[2] == int64_t(-1));
         REPORTER_ASSERT(r, mask[3] == int64_t(-1));

         REPORTER_ASSERT(r,  any(mask));
         REPORTER_ASSERT(r, !all(mask));
     }

     {
         // Tests that any/all work with non-zero values, not just full bit lanes.
         REPORTER_ASSERT(r,  all(int4{1,2,3,4}));
         REPORTER_ASSERT(r, !all(int4{1,2,3}));
         REPORTER_ASSERT(r,  any(int4{1,2}));
         REPORTER_ASSERT(r, !any(int4{}));
     }

     REPORTER_ASSERT(r, min(float4{1,2,3,4}) == 1);
     REPORTER_ASSERT(r, max(float4{1,2,3,4}) == 4);

     REPORTER_ASSERT(r, all(int4{1,2,3,4,5} == int4{1,2,3,4}));
     REPORTER_ASSERT(r, all(int4{1,2,3,4}   == int4{1,2,3,4}));
     REPORTER_ASSERT(r, all(int4{1,2,3}     == int4{1,2,3,0}));
     REPORTER_ASSERT(r, all(int4{1,2}       == int4{1,2,0,0}));
     REPORTER_ASSERT(r, all(int4{1}         == int4{1,0,0,0}));
     REPORTER_ASSERT(r, all(int4(1)         == int4{1,1,1,1}));
     REPORTER_ASSERT(r, all(int4{}          == int4{0,0,0,0}));
     REPORTER_ASSERT(r, all(int4()          == int4{0,0,0,0}));

     REPORTER_ASSERT(r, all(int4{1,2,2,1} == min(int4{1,2,3,4}, int4{4,3,2,1})));
     REPORTER_ASSERT(r, all(int4{4,3,3,4} == max(int4{1,2,3,4}, int4{4,3,2,1})));

     REPORTER_ASSERT(r, all(if_then_else(float4{1,2,3,2} <= float4{2,2,2,2}, float4(42), float4(47))
                            == float4{42,42,47,42}));

     REPORTER_ASSERT(r, all(floor(float4{-1.5f,1.5f,1.0f,-1.0f}) == float4{-2.0f,1.0f,1.0f,-1.0f}));
     REPORTER_ASSERT(r, all( ceil(float4{-1.5f,1.5f,1.0f,-1.0f}) == float4{-1.0f,2.0f,1.0f,-1.0f}));
     REPORTER_ASSERT(r, all(trunc(float4{-1.5f,1.5f,1.0f,-1.0f}) == float4{-1.0f,1.0f,1.0f,-1.0f}));
     REPORTER_ASSERT(r, all(round(float4{-1.5f,1.5f,1.0f,-1.0f}) == float4{-2.0f,2.0f,1.0f,-1.0f}));


     REPORTER_ASSERT(r, all(abs(float4{-2,-1,0,1}) == float4{2,1,0,1}));

     // TODO(mtklein): these tests could be made less loose.
     REPORTER_ASSERT(r, all( sqrt(float4{2,3,4,5}) < float4{2,2,3,3}));
     REPORTER_ASSERT(r, all( sqrt(float2{2,3}) < float2{2,2}));

     REPORTER_ASSERT(r, all(cast<int>(float4{-1.5f,0.5f,1.0f,1.5f}) == int4{-1,0,1,1}));

     float buf[] = {1,2,3,4,5,6};
     REPORTER_ASSERT(r, all(float4::Load(buf) == float4{1,2,3,4}));
     float4{2,3,4,5}.store(buf);
     REPORTER_ASSERT(r, buf[0] == 2
                     && buf[1] == 3
                     && buf[2] == 4
                     && buf[3] == 5
                     && buf[4] == 5
                     && buf[5] == 6);
     REPORTER_ASSERT(r, all(float4::Load(buf+0) == float4{2,3,4,5}));
     REPORTER_ASSERT(r, all(float4::Load(buf+2) == float4{4,5,5,6}));

     REPORTER_ASSERT(r, all(shuffle<2,1,0,3>        (float4{1,2,3,4}) == float4{3,2,1,4}));
     REPORTER_ASSERT(r, all(shuffle<2,1>            (float4{1,2,3,4}) == float2{3,2}));
     REPORTER_ASSERT(r, all(shuffle<3,3,3,3>        (float4{1,2,3,4}) == float4{4,4,4,4}));
     REPORTER_ASSERT(r, all(shuffle<2,1,2,1,2,1,2,1>(float4{1,2,3,4})
                            == float8{3,2,3,2,3,2,3,2}));

     // Test that mixed types can be used where they make sense.  Mostly about ergonomics.
     REPORTER_ASSERT(r, all(float4{1,2,3,4} < 5));
     REPORTER_ASSERT(r, all( byte4{1,2,3,4} < 5));
     REPORTER_ASSERT(r, all(  int4{1,2,3,4} < 5.0f));
     float4 five = 5;
     REPORTER_ASSERT(r, all(five == 5.0f));
     REPORTER_ASSERT(r, all(five == 5));

     REPORTER_ASSERT(r, all(max(2, min(float4{1,2,3,4}, 3)) == float4{2,2,3,3}));

     for (int x = 0; x < 256; x++)
     for (int y = 0; y < 256; y++) {
         uint8_t want = (uint8_t)( 255*(x/255.0 * y/255.0) + 0.5 );

         {
             uint8_t got = div255(Vec<8, uint16_t>(x) * Vec<8, uint16_t>(y) )[0];
             REPORTER_ASSERT(r, got == want);
         }

         {
             uint8_t got = approx_scale(Vec<8,uint8_t>(x), Vec<8,uint8_t>(y))[0];

             REPORTER_ASSERT(r, got == want-1 ||
                                got == want   ||
                                got == want+1);
             if (x == 0 || y == 0 || x == 255 || y == 255) {
                 REPORTER_ASSERT(r, got == want);
             }
         }
     }

     for (int x = 0; x < 256; x++)
     for (int y = 0; y < 256; y++) {
         uint16_t xy = x*y;

         // Make sure to cover implementation cases N=8, N<8, and N>8.
         REPORTER_ASSERT(r, all(mull(byte2 (x), byte2 (y)) == xy));
         REPORTER_ASSERT(r, all(mull(byte4 (x), byte4 (y)) == xy));
         REPORTER_ASSERT(r, all(mull(byte8 (x), byte8 (y)) == xy));
         REPORTER_ASSERT(r, all(mull(byte16(x), byte16(y)) == xy));
     }

     {
         // Intentionally not testing -0, as we don't care if it's 0x0000 or 0x8000.
         float8 fs = {+0.0f,+0.5f,+1.0f,+2.0f,
                      -4.0f,-0.5f,-1.0f,-2.0f};
         Vec<8,uint16_t> hs = {0x0000,0x3800,0x3c00,0x4000,
                               0xc400,0xb800,0xbc00,0xc000};
         REPORTER_ASSERT(r, all(  to_half(fs) == hs));
         REPORTER_ASSERT(r, all(from_half(hs) == fs));
     }
 }

 DEF_TEST(SkVx_xy, r) {
     float2 f = float2(1,2);
     REPORTER_ASSERT(r, all(f == float2{1,2}));
     REPORTER_ASSERT(r, f.x() == 1);
     REPORTER_ASSERT(r, f.y() == 2);
     f.y() = 9;
     REPORTER_ASSERT(r, all(f == float2{1,9}));
     f.x() = 0;
     REPORTER_ASSERT(r, all(f == float2(0,9)));
     f[0] = 8;
     REPORTER_ASSERT(r, f.x() == 8);
     f[1] = 6;
     REPORTER_ASSERT(r, f.y() == 6);
     REPORTER_ASSERT(r, all(f == float2(8,6)));
     f = f.yx();
     REPORTER_ASSERT(r, all(f == float2(6,8)));
     REPORTER_ASSERT(r, bit_pun<SkPoint>(f) == SkPoint::Make(6,8));
     SkPoint p;
     f.store(&p);
     REPORTER_ASSERT(r, p == SkPoint::Make(6,8));
     f.yx().store(&p);
     REPORTER_ASSERT(r, p == SkPoint::Make(8,6));
     REPORTER_ASSERT(r, all(f.xyxy() == float4(6,8,6,8)));
     REPORTER_ASSERT(r, all(f.xyxy() == float4(f,f)));
     REPORTER_ASSERT(r, all(join(f,f) == f.xyxy()));
     REPORTER_ASSERT(r, all(join(f.yx(),f) == float4(f.y(),f.x(),f)));
     REPORTER_ASSERT(r, all(join(f.yx(),f) == float4(f.yx(),f.x(),f.y())));
     REPORTER_ASSERT(r, all(join(f,f.yx()) == float4(f.x(),f.y(),f.yx())));
     REPORTER_ASSERT(r, all(join(f.yx(),f.yx()) == float4(f.yx(),f.yx())));
 }

 DEF_TEST(SkVx_xyzw, r) {
     float4 f = float4{1,2,3,4};
     REPORTER_ASSERT(r, all(f == float4(1,2,3,4)));
     REPORTER_ASSERT(r, all(f == float4(1,2,float2(3,4))));
     REPORTER_ASSERT(r, all(f == float4(float2(1,2),3,4)));
     REPORTER_ASSERT(r, all(f == float4(float2(1,2),float2(3,4))));
     f.xy() = float2(9,8);
     REPORTER_ASSERT(r, all(f == float4(9,8,3,4)));
     f.zw().x() = 7;
     f.zw().y() = 6;
     REPORTER_ASSERT(r, all(f == float4(9,8,7,6)));
     f.x() = 5;
     f.y() = 4;
     f.z() = 3;
     f.w() = 2;
     REPORTER_ASSERT(r, all(f == float4(5,4,3,2)));
     f[0] = 0;
     REPORTER_ASSERT(r, f.x() == 0);
     f[1] = 1;
     REPORTER_ASSERT(r, f.y() == 1);
     f[2] = 2;
     REPORTER_ASSERT(r, f.z() == 2);
     f[3] = 3;
     REPORTER_ASSERT(r, f.w() == 3);
     REPORTER_ASSERT(r, all(f.xy() == float2(0,1)));
     REPORTER_ASSERT(r, all(f.zw() == float2{2,3}));
     REPORTER_ASSERT(r, all(f == float4(0,1,2,3)));
     REPORTER_ASSERT(r, all(f.yxwz().lo == shuffle<1,0>(f)));
     REPORTER_ASSERT(r, all(f.yxwz().hi == shuffle<3,2>(f)));
     REPORTER_ASSERT(r, all(f.zwxy().lo.lo == f.z()));
     REPORTER_ASSERT(r, all(f.zwxy().lo.hi == f.w()));
     REPORTER_ASSERT(r, all(f.zwxy().hi.lo == f.x()));
     REPORTER_ASSERT(r, all(f.zwxy().hi.hi == f.y()));
     REPORTER_ASSERT(r, f.yxwz().lo.lo.val == f.y());
     REPORTER_ASSERT(r, f.yxwz().lo.hi.val == f.x());
     REPORTER_ASSERT(r, f.yxwz().hi.lo.val == f.w());
     REPORTER_ASSERT(r, f.yxwz().hi.hi.val == f.z());

     REPORTER_ASSERT(r, all(naive_if_then_else(int2(0,~0),
                                               shuffle<3,2>(float4(0,1,2,3)),
                                               float4(4,5,6,7).xy()) == float2(4,2)));
     REPORTER_ASSERT(r, all(if_then_else(int2(0,~0),
                                         shuffle<3,2>(float4(0,1,2,3)),
                                         float4(4,5,6,7).xy()) == float2(4,2)));
     REPORTER_ASSERT(r, all(naive_if_then_else(int2(0,~0).xyxy(),
                                               float4(0,1,2,3).zwxy(),
                                               float4(4,5,6,7)) == float4(4,3,6,1)));
     REPORTER_ASSERT(r, all(if_then_else(int2(0,~0).xyxy(),
                                         float4(0,1,2,3).zwxy(),
                                         float4(4,5,6,7)) == float4(4,3,6,1)));

     REPORTER_ASSERT(r, all(pin(float4(0,1,2,3).yxwz(),
                                float2(1).xyxy(),
                                float2(2).xyxy()) == float4(1,1,2,2)));
 }

 DEF_TEST(SkVx_cross_dot, r) {
     REPORTER_ASSERT(r, cross(int2{0,1}, int2{0,1}) == 0);
     REPORTER_ASSERT(r, cross(int2{1,0}, int2{1,0}) == 0);
     REPORTER_ASSERT(r, cross(int2{1,1}, int2{1,1}) == 0);
     REPORTER_ASSERT(r, cross(int2{1,1}, int2{1,-1}) == -2);
     REPORTER_ASSERT(r, cross(int2{1,1}, int2{-1,1}) == 2);

     REPORTER_ASSERT(r, dot(int2{0,1}, int2{1,0}) == 0);
     REPORTER_ASSERT(r, dot(int2{1,0}, int2{0,1}) == 0);
     REPORTER_ASSERT(r, dot(int2{1,1}, int2{1,-1}) == 0);
     REPORTER_ASSERT(r, dot(int2{1,1}, int2{1,1}) == 2);
     REPORTER_ASSERT(r, dot(int2{1,1}, int2{-1,-1}) == -2);

     SkRandom rand;
     for (int i = 0; i < 100; ++i) {
         float a=rand.nextRangeF(-1,1), b=rand.nextRangeF(-1,1), c=rand.nextRangeF(-1,1),
               d=rand.nextRangeF(-1,1);
         constexpr static float kTolerance = 1.f / (1 << 20);
         REPORTER_ASSERT(r, SkScalarNearlyEqual(
                 cross(float2{a,b}, float2{c,d}), SkPoint::CrossProduct({a,b}, {c,d}), kTolerance));
         REPORTER_ASSERT(r, SkScalarNearlyEqual(
                 dot(float2{a,b}, float2{c,d}), SkPoint::DotProduct({a,b}, {c,d}), kTolerance));
     }

     auto assertDoublesEqual = [&](double left, double right) {
         REPORTER_ASSERT(r, SkScalarNearlyEqual(left, right), "%f != %f", left, right);
     };
     assertDoublesEqual(cross(double2{1.2, 3.4}, double2{3.4, -1.2}),          -13.000000);
     assertDoublesEqual(cross(double2{12.34, 5.6}, double2{7.8, -9.0}),       -154.740000);
     assertDoublesEqual(cross(double2{12.34, 5.6}, double2{7.8, 9.012345678}),  67.532346);
 }

 template<int N, typename T> void check_strided_loads(skiatest::Reporter* r) {
     using Vec = Vec<N,T>;
     T values[N*4];
     std::iota(values, values + N*4, 0);
     Vec a, b, c, d;
     strided_load2(values, a, b);
     for (int i = 0; i < N; ++i) {
         REPORTER_ASSERT(r, a[i] == values[i*2]);
         REPORTER_ASSERT(r, b[i] == values[i*2 + 1]);
     }
     strided_load4(values, a, b, c, d);
     for (int i = 0; i < N; ++i) {
         REPORTER_ASSERT(r, a[i] == values[i*4]);
         REPORTER_ASSERT(r, b[i] == values[i*4 + 1]);
         REPORTER_ASSERT(r, c[i] == values[i*4 + 2]);
         REPORTER_ASSERT(r, d[i] == values[i*4 + 3]);
     }
 }

 template<typename T> void check_strided_loads(skiatest::Reporter* r) {
     check_strided_loads<1,T>(r);
     check_strided_loads<2,T>(r);
     check_strided_loads<4,T>(r);
     check_strided_loads<8,T>(r);
     check_strided_loads<16,T>(r);
     check_strided_loads<32,T>(r);
 }

 DEF_TEST(SkVx_strided_loads, r) {
     check_strided_loads<uint32_t>(r);
     check_strided_loads<uint16_t>(r);
     check_strided_loads<uint8_t>(r);
     check_strided_loads<int32_t>(r);
     check_strided_loads<int16_t>(r);
     check_strided_loads<int8_t>(r);
     check_strided_loads<float>(r);
 }

 DEF_TEST(SkVx_ScaledDividerU32, r) {
     static constexpr uint32_t kMax = std::numeric_limits<uint32_t>::max();

     auto errorBounds = [&](uint32_t actual, uint32_t expected) {
         uint32_t lowerLimit = expected == 0 ? 0 : expected - 1,
                  upperLimit = expected == kMax ? kMax : expected + 1;
         return lowerLimit <= actual && actual <= upperLimit;
     };

     auto test = [&](uint32_t denom) {
         // half == 1 so, the max to check is kMax-1
         ScaledDividerU32 d(denom);
         uint32_t maxCheck = static_cast<uint32_t>(
                 std::floor((double)(kMax - d.half()) / denom + 0.5));
         REPORTER_ASSERT(r, errorBounds(d.divide((kMax))[0], maxCheck));
         for (uint32_t i = 0; i < kMax - d.half(); i += 65535) {
             uint32_t expected = static_cast<uint32_t>(std::floor((double)i / denom + 0.5));
             auto actual = d.divide(i + d.half());
             if (!errorBounds(actual[0], expected)) {
                 SkDebugf("i: %u expected: %u actual: %u\n", i, expected, actual[0]);
             }
             // Make sure all the lanes are the same.
             for (int e = 1; e < 4; e++) {
                 SkASSERT(actual[0] == actual[e]);
             }
         }
     };

     test(2);
     test(3);
     test(5);
     test(7);
     test(27);
     test(65'535);
     test(15'485'863);
     test(512'927'377);
 }

 DEF_TEST(SkVx_saturated_add, r) {
     for (int a = 0; a < (1<<8); a++) {
         for (int b = 0; b < (1<<8); b++) {
             int exact = a+b;
             if (exact > 255) { exact = 255; }
             if (exact <   0) { exact =   0; }

             REPORTER_ASSERT(r, saturated_add(skvx::byte16(a), skvx::byte16(b))[0] == exact);
         }
     }
 }

 DEF_TEST(SkVx_length, r) {
     auto assertFloatsEqual = [&](float left, float right) {
         REPORTER_ASSERT(r, SkScalarNearlyEqual(left, right), "%f != %f", left, right);
     };
     auto assertDoublesEqual = [&](double left, double right) {
         REPORTER_ASSERT(r, SkScalarNearlyEqual(left, right), "%f != %f", left, right);
     };

     assertFloatsEqual(length(float2{0, 1}),       1.000000f);
     assertFloatsEqual(length(float2{2, 0}),       2.000000f);
     assertFloatsEqual(length(float2{3, 4}),       5.000000f);
     assertFloatsEqual(length(float2{1, 1}),       1.414214f);
     assertFloatsEqual(length(float2{2.5f, 2.5f}), 3.535534f);
     assertFloatsEqual(length(float4{1, 2, 3, 4}), 5.477226f);

     assertDoublesEqual(length(double2{2.5, 2.5}),           3.535534);
     assertDoublesEqual(length(double4{1.5, 2.5, 3.5, 4.5}), 6.403124);
 }

 DEF_TEST(SkVx_normalize, r) {
     auto assertFloatsEqual = [&](float left, float right) {
         REPORTER_ASSERT(r, SkScalarNearlyEqual(left, right), "%f != %f", left, right);
     };
     auto assertDoublesEqual = [&](double left, double right) {
         REPORTER_ASSERT(r, SkScalarNearlyEqual(left, right), "%f != %f", left, right);
     };

     skvx::float2 twoFloats = normalize(skvx::float2{1.2f, 3.4f});
     assertFloatsEqual(twoFloats[0], 0.332820f);
     assertFloatsEqual(twoFloats[1], 0.942990f);

     skvx::double2 twoDoubles = normalize(skvx::double2{2.3, -4.5});
     assertDoublesEqual(twoDoubles[0],  0.455111);
     assertDoublesEqual(twoDoubles[1], -0.890435);

     skvx::double4 fourDoubles = normalize(skvx::double4{1.2, 3.4, 5.6, 7.8});
     assertDoublesEqual(fourDoubles[0],  0.116997);
     assertDoublesEqual(fourDoubles[1],  0.331490);
     assertDoublesEqual(fourDoubles[2],  0.545984);
     assertDoublesEqual(fourDoubles[3],  0.760478);
 }

 DEF_TEST(SkVx_normalize_infinity_and_nan, r) {
     skvx::float2 zeroLenVec = normalize(skvx::float2{0, 0});
     REPORTER_ASSERT(r, std::isnan(zeroLenVec[0]), "%f is not nan", zeroLenVec[0]);
     REPORTER_ASSERT(r, std::isnan(zeroLenVec[1]), "%f is not nan", zeroLenVec[1]);
     REPORTER_ASSERT(r, !isfinite(zeroLenVec));

     skvx::float2 tooBigVec = normalize(skvx::float2{std::numeric_limits<float>::max(),
                                                     std::numeric_limits<float>::max()});
     REPORTER_ASSERT(r, tooBigVec[0] == 0, "%f != 0", tooBigVec[0]);
     REPORTER_ASSERT(r, tooBigVec[1] == 0, "%f != 0", tooBigVec[1]);

     skvx::double2 tooBigVecD = normalize(skvx::double2{std::numeric_limits<double>::max(),
                                                        std::numeric_limits<double>::max()});
     REPORTER_ASSERT(r, tooBigVecD[0] == 0, "%f != 0", tooBigVecD[0]);
     REPORTER_ASSERT(r, tooBigVecD[1] == 0, "%f != 0", tooBigVecD[1]);
 }

 DEF_TEST(SkVx_isfinite, r) {
     REPORTER_ASSERT(r, isfinite(skvx::float2{0, 0}));
     REPORTER_ASSERT(r, isfinite(skvx::double4{1.2, 3.4, 5.6, 7.8}));
     REPORTER_ASSERT(r, isfinite(skvx::float8{8, 7, 6, 5, 4, 3, 2, 1}));

     REPORTER_ASSERT(r, !isfinite(skvx::float2{0, NAN}));
     REPORTER_ASSERT(r, !isfinite(skvx::float2{INFINITY, 10}));
     REPORTER_ASSERT(r, !isfinite(skvx::float2{NAN, INFINITY}));

     for (int i = 0; i < 4; i++) {
         auto v = skvx::double4{4, 3, 2, 1};
         v[i] = INFINITY;
         REPORTER_ASSERT(r, !isfinite(v), "index %d INFINITY", i);
         v[i] = NAN;
         REPORTER_ASSERT(r, !isfinite(v), "index %d NAN", i);
     }

     for (int i = 0; i < 8; i++) {
         auto v = skvx::float8{8, 7, 6, 5, 4, 3, 2, 1};
         v[i] = INFINITY;
         REPORTER_ASSERT(r, !isfinite(v), "index %d INFINITY", i);
         v[i] = NAN;
         REPORTER_ASSERT(r, !isfinite(v), "index %d NAN", i);
     }
 }

 }  // namespace skvx
	/*
	* Copyright 2019 Google Inc.
	*
	* Use of this source code is governed by a BSD-style license that can be
	* found in the LICENSE file.
	*/

	#include "include/core/SkPoint.h"
	#include "src/base/SkRandom.h"
	#include "src/base/SkVx.h"
	#include "tests/Test.h"

	#include <numeric>

	namespace skvx {

	DEF_TEST(SkVx, r) {
	static_assert(sizeof(float2) == 8, "");
	static_assert(sizeof(float4) == 16, "");
	static_assert(sizeof(float8) == 32, "");

	static_assert(sizeof(byte2) == 2, "");
	static_assert(sizeof(byte4) == 4, "");
	static_assert(sizeof(byte8) == 8, "");

	{
	int4 mask = float4{1,2,3,4} < float4{1,2,4,8};
	REPORTER_ASSERT(r, mask[0] == int32_t( 0));
	REPORTER_ASSERT(r, mask[1] == int32_t( 0));
	REPORTER_ASSERT(r, mask[2] == int32_t(-1));
	REPORTER_ASSERT(r, mask[3] == int32_t(-1));

	REPORTER_ASSERT(r, any(mask));
	REPORTER_ASSERT(r, !all(mask));
	}

	{
	long4 mask = double4{1,2,3,4} < double4{1,2,4,8};
	REPORTER_ASSERT(r, mask[0] == int64_t( 0));
	REPORTER_ASSERT(r, mask[1] == int64_t( 0));
	REPORTER_ASSERT(r, mask[2] == int64_t(-1));
	REPORTER_ASSERT(r, mask[3] == int64_t(-1));

	REPORTER_ASSERT(r, any(mask));
	REPORTER_ASSERT(r, !all(mask));
	}

	{
	// Tests that any/all work with non-zero values, not just full bit lanes.
	REPORTER_ASSERT(r, all(int4{1,2,3,4}));
	REPORTER_ASSERT(r, !all(int4{1,2,3}));
	REPORTER_ASSERT(r, any(int4{1,2}));
	REPORTER_ASSERT(r, !any(int4{}));
	}

	REPORTER_ASSERT(r, min(float4{1,2,3,4}) == 1);
	REPORTER_ASSERT(r, max(float4{1,2,3,4}) == 4);

	REPORTER_ASSERT(r, all(int4{1,2,3,4,5} == int4{1,2,3,4}));
	REPORTER_ASSERT(r, all(int4{1,2,3,4} == int4{1,2,3,4}));
	REPORTER_ASSERT(r, all(int4{1,2,3} == int4{1,2,3,0}));
	REPORTER_ASSERT(r, all(int4{1,2} == int4{1,2,0,0}));
	REPORTER_ASSERT(r, all(int4{1} == int4{1,0,0,0}));
	REPORTER_ASSERT(r, all(int4(1) == int4{1,1,1,1}));
	REPORTER_ASSERT(r, all(int4{} == int4{0,0,0,0}));
	REPORTER_ASSERT(r, all(int4() == int4{0,0,0,0}));

	REPORTER_ASSERT(r, all(int4{1,2,2,1} == min(int4{1,2,3,4}, int4{4,3,2,1})));
	REPORTER_ASSERT(r, all(int4{4,3,3,4} == max(int4{1,2,3,4}, int4{4,3,2,1})));

	REPORTER_ASSERT(r, all(if_then_else(float4{1,2,3,2} <= float4{2,2,2,2}, float4(42), float4(47))
	== float4{42,42,47,42}));

	REPORTER_ASSERT(r, all(floor(float4{-1.5f,1.5f,1.0f,-1.0f}) == float4{-2.0f,1.0f,1.0f,-1.0f}));
	REPORTER_ASSERT(r, all( ceil(float4{-1.5f,1.5f,1.0f,-1.0f}) == float4{-1.0f,2.0f,1.0f,-1.0f}));
	REPORTER_ASSERT(r, all(trunc(float4{-1.5f,1.5f,1.0f,-1.0f}) == float4{-1.0f,1.0f,1.0f,-1.0f}));
	REPORTER_ASSERT(r, all(round(float4{-1.5f,1.5f,1.0f,-1.0f}) == float4{-2.0f,2.0f,1.0f,-1.0f}));


	REPORTER_ASSERT(r, all(abs(float4{-2,-1,0,1}) == float4{2,1,0,1}));

	// TODO(mtklein): these tests could be made less loose.
	REPORTER_ASSERT(r, all( sqrt(float4{2,3,4,5}) < float4{2,2,3,3}));
	REPORTER_ASSERT(r, all( sqrt(float2{2,3}) < float2{2,2}));

	REPORTER_ASSERT(r, all(cast<int>(float4{-1.5f,0.5f,1.0f,1.5f}) == int4{-1,0,1,1}));

	float buf[] = {1,2,3,4,5,6};
	REPORTER_ASSERT(r, all(float4::Load(buf) == float4{1,2,3,4}));
	float4{2,3,4,5}.store(buf);
	REPORTER_ASSERT(r, buf[0] == 2
	&& buf[1] == 3
	&& buf[2] == 4
	&& buf[3] == 5
	&& buf[4] == 5
	&& buf[5] == 6);
	REPORTER_ASSERT(r, all(float4::Load(buf+0) == float4{2,3,4,5}));
	REPORTER_ASSERT(r, all(float4::Load(buf+2) == float4{4,5,5,6}));

	REPORTER_ASSERT(r, all(shuffle<2,1,0,3> (float4{1,2,3,4}) == float4{3,2,1,4}));
	REPORTER_ASSERT(r, all(shuffle<2,1> (float4{1,2,3,4}) == float2{3,2}));
	REPORTER_ASSERT(r, all(shuffle<3,3,3,3> (float4{1,2,3,4}) == float4{4,4,4,4}));
	REPORTER_ASSERT(r, all(shuffle<2,1,2,1,2,1,2,1>(float4{1,2,3,4})
	== float8{3,2,3,2,3,2,3,2}));

	// Test that mixed types can be used where they make sense. Mostly about ergonomics.
	REPORTER_ASSERT(r, all(float4{1,2,3,4} < 5));
	REPORTER_ASSERT(r, all( byte4{1,2,3,4} < 5));
	REPORTER_ASSERT(r, all( int4{1,2,3,4} < 5.0f));
	float4 five = 5;
	REPORTER_ASSERT(r, all(five == 5.0f));
	REPORTER_ASSERT(r, all(five == 5));

	REPORTER_ASSERT(r, all(max(2, min(float4{1,2,3,4}, 3)) == float4{2,2,3,3}));

	for (int x = 0; x < 256; x++)
	for (int y = 0; y < 256; y++) {
	uint8_t want = (uint8_t)( 255(x/255.0 y/255.0) + 0.5 );

	{
	uint8_t got = div255(Vec<8, uint16_t>(x) * Vec<8, uint16_t>(y) )[0];
	REPORTER_ASSERT(r, got == want);
	}

	{
	uint8_t got = approx_scale(Vec<8,uint8_t>(x), Vec<8,uint8_t>(y))[0];

	REPORTER_ASSERT(r, got == want-1 \|\|
	got == want \|\|
	got == want+1);
	if (x == 0 \|\| y == 0 \|\| x == 255 \|\| y == 255) {
	REPORTER_ASSERT(r, got == want);
	}
	}
	}

	for (int x = 0; x < 256; x++)
	for (int y = 0; y < 256; y++) {
	uint16_t xy = x*y;

	// Make sure to cover implementation cases N=8, N<8, and N>8.
	REPORTER_ASSERT(r, all(mull(byte2 (x), byte2 (y)) == xy));
	REPORTER_ASSERT(r, all(mull(byte4 (x), byte4 (y)) == xy));
	REPORTER_ASSERT(r, all(mull(byte8 (x), byte8 (y)) == xy));
	REPORTER_ASSERT(r, all(mull(byte16(x), byte16(y)) == xy));
	}

	{
	// Intentionally not testing -0, as we don't care if it's 0x0000 or 0x8000.
	float8 fs = {+0.0f,+0.5f,+1.0f,+2.0f,
	-4.0f,-0.5f,-1.0f,-2.0f};
	Vec<8,uint16_t> hs = {0x0000,0x3800,0x3c00,0x4000,
	0xc400,0xb800,0xbc00,0xc000};
	REPORTER_ASSERT(r, all( to_half(fs) == hs));
	REPORTER_ASSERT(r, all(from_half(hs) == fs));
	}
	}

	DEF_TEST(SkVx_xy, r) {
	float2 f = float2(1,2);
	REPORTER_ASSERT(r, all(f == float2{1,2}));
	REPORTER_ASSERT(r, f.x() == 1);
	REPORTER_ASSERT(r, f.y() == 2);
	f.y() = 9;
	REPORTER_ASSERT(r, all(f == float2{1,9}));
	f.x() = 0;
	REPORTER_ASSERT(r, all(f == float2(0,9)));
	f[0] = 8;
	REPORTER_ASSERT(r, f.x() == 8);
	f[1] = 6;
	REPORTER_ASSERT(r, f.y() == 6);
	REPORTER_ASSERT(r, all(f == float2(8,6)));
	f = f.yx();
	REPORTER_ASSERT(r, all(f == float2(6,8)));
	REPORTER_ASSERT(r, bit_pun<SkPoint>(f) == SkPoint::Make(6,8));
	SkPoint p;
	f.store(&p);
	REPORTER_ASSERT(r, p == SkPoint::Make(6,8));
	f.yx().store(&p);
	REPORTER_ASSERT(r, p == SkPoint::Make(8,6));
	REPORTER_ASSERT(r, all(f.xyxy() == float4(6,8,6,8)));
	REPORTER_ASSERT(r, all(f.xyxy() == float4(f,f)));
	REPORTER_ASSERT(r, all(join(f,f) == f.xyxy()));
	REPORTER_ASSERT(r, all(join(f.yx(),f) == float4(f.y(),f.x(),f)));
	REPORTER_ASSERT(r, all(join(f.yx(),f) == float4(f.yx(),f.x(),f.y())));
	REPORTER_ASSERT(r, all(join(f,f.yx()) == float4(f.x(),f.y(),f.yx())));
	REPORTER_ASSERT(r, all(join(f.yx(),f.yx()) == float4(f.yx(),f.yx())));
	}

	DEF_TEST(SkVx_xyzw, r) {
	float4 f = float4{1,2,3,4};
	REPORTER_ASSERT(r, all(f == float4(1,2,3,4)));
	REPORTER_ASSERT(r, all(f == float4(1,2,float2(3,4))));
	REPORTER_ASSERT(r, all(f == float4(float2(1,2),3,4)));
	REPORTER_ASSERT(r, all(f == float4(float2(1,2),float2(3,4))));
	f.xy() = float2(9,8);
	REPORTER_ASSERT(r, all(f == float4(9,8,3,4)));
	f.zw().x() = 7;
	f.zw().y() = 6;
	REPORTER_ASSERT(r, all(f == float4(9,8,7,6)));
	f.x() = 5;
	f.y() = 4;
	f.z() = 3;
	f.w() = 2;
	REPORTER_ASSERT(r, all(f == float4(5,4,3,2)));
	f[0] = 0;
	REPORTER_ASSERT(r, f.x() == 0);
	f[1] = 1;
	REPORTER_ASSERT(r, f.y() == 1);
	f[2] = 2;
	REPORTER_ASSERT(r, f.z() == 2);
	f[3] = 3;
	REPORTER_ASSERT(r, f.w() == 3);
	REPORTER_ASSERT(r, all(f.xy() == float2(0,1)));
	REPORTER_ASSERT(r, all(f.zw() == float2{2,3}));
	REPORTER_ASSERT(r, all(f == float4(0,1,2,3)));
	REPORTER_ASSERT(r, all(f.yxwz().lo == shuffle<1,0>(f)));
	REPORTER_ASSERT(r, all(f.yxwz().hi == shuffle<3,2>(f)));
	REPORTER_ASSERT(r, all(f.zwxy().lo.lo == f.z()));
	REPORTER_ASSERT(r, all(f.zwxy().lo.hi == f.w()));
	REPORTER_ASSERT(r, all(f.zwxy().hi.lo == f.x()));
	REPORTER_ASSERT(r, all(f.zwxy().hi.hi == f.y()));
	REPORTER_ASSERT(r, f.yxwz().lo.lo.val == f.y());
	REPORTER_ASSERT(r, f.yxwz().lo.hi.val == f.x());
	REPORTER_ASSERT(r, f.yxwz().hi.lo.val == f.w());
	REPORTER_ASSERT(r, f.yxwz().hi.hi.val == f.z());

	REPORTER_ASSERT(r, all(naive_if_then_else(int2(0,~0),
	shuffle<3,2>(float4(0,1,2,3)),
	float4(4,5,6,7).xy()) == float2(4,2)));
	REPORTER_ASSERT(r, all(if_then_else(int2(0,~0),
	shuffle<3,2>(float4(0,1,2,3)),
	float4(4,5,6,7).xy()) == float2(4,2)));
	REPORTER_ASSERT(r, all(naive_if_then_else(int2(0,~0).xyxy(),
	float4(0,1,2,3).zwxy(),
	float4(4,5,6,7)) == float4(4,3,6,1)));
	REPORTER_ASSERT(r, all(if_then_else(int2(0,~0).xyxy(),
	float4(0,1,2,3).zwxy(),
	float4(4,5,6,7)) == float4(4,3,6,1)));

	REPORTER_ASSERT(r, all(pin(float4(0,1,2,3).yxwz(),
	float2(1).xyxy(),
	float2(2).xyxy()) == float4(1,1,2,2)));
	}

	DEF_TEST(SkVx_cross_dot, r) {
	REPORTER_ASSERT(r, cross(int2{0,1}, int2{0,1}) == 0);
	REPORTER_ASSERT(r, cross(int2{1,0}, int2{1,0}) == 0);
	REPORTER_ASSERT(r, cross(int2{1,1}, int2{1,1}) == 0);
	REPORTER_ASSERT(r, cross(int2{1,1}, int2{1,-1}) == -2);
	REPORTER_ASSERT(r, cross(int2{1,1}, int2{-1,1}) == 2);

	REPORTER_ASSERT(r, dot(int2{0,1}, int2{1,0}) == 0);
	REPORTER_ASSERT(r, dot(int2{1,0}, int2{0,1}) == 0);
	REPORTER_ASSERT(r, dot(int2{1,1}, int2{1,-1}) == 0);
	REPORTER_ASSERT(r, dot(int2{1,1}, int2{1,1}) == 2);
	REPORTER_ASSERT(r, dot(int2{1,1}, int2{-1,-1}) == -2);

	SkRandom rand;
	for (int i = 0; i < 100; ++i) {
	float a=rand.nextRangeF(-1,1), b=rand.nextRangeF(-1,1), c=rand.nextRangeF(-1,1),
	d=rand.nextRangeF(-1,1);
	constexpr static float kTolerance = 1.f / (1 << 20);
	REPORTER_ASSERT(r, SkScalarNearlyEqual(
	cross(float2{a,b}, float2{c,d}), SkPoint::CrossProduct({a,b}, {c,d}), kTolerance));
	REPORTER_ASSERT(r, SkScalarNearlyEqual(
	dot(float2{a,b}, float2{c,d}), SkPoint::DotProduct({a,b}, {c,d}), kTolerance));
	}

	auto assertDoublesEqual = [&](double left, double right) {
	REPORTER_ASSERT(r, SkScalarNearlyEqual(left, right), "%f != %f", left, right);
	};
	assertDoublesEqual(cross(double2{1.2, 3.4}, double2{3.4, -1.2}), -13.000000);
	assertDoublesEqual(cross(double2{12.34, 5.6}, double2{7.8, -9.0}), -154.740000);
	assertDoublesEqual(cross(double2{12.34, 5.6}, double2{7.8, 9.012345678}), 67.532346);
	}

	template<int N, typename T> void check_strided_loads(skiatest::Reporter* r) {
	using Vec = Vec<N,T>;
	T values[N*4];
	std::iota(values, values + N*4, 0);
	Vec a, b, c, d;
	strided_load2(values, a, b);
	for (int i = 0; i < N; ++i) {
	REPORTER_ASSERT(r, a[i] == values[i*2]);
	REPORTER_ASSERT(r, b[i] == values[i*2 + 1]);
	}
	strided_load4(values, a, b, c, d);
	for (int i = 0; i < N; ++i) {
	REPORTER_ASSERT(r, a[i] == values[i*4]);
	REPORTER_ASSERT(r, b[i] == values[i*4 + 1]);
	REPORTER_ASSERT(r, c[i] == values[i*4 + 2]);
	REPORTER_ASSERT(r, d[i] == values[i*4 + 3]);
	}
	}

	template<typename T> void check_strided_loads(skiatest::Reporter* r) {
	check_strided_loads<1,T>(r);
	check_strided_loads<2,T>(r);
	check_strided_loads<4,T>(r);
	check_strided_loads<8,T>(r);
	check_strided_loads<16,T>(r);
	check_strided_loads<32,T>(r);
	}

	DEF_TEST(SkVx_strided_loads, r) {
	check_strided_loads<uint32_t>(r);
	check_strided_loads<uint16_t>(r);
	check_strided_loads<uint8_t>(r);
	check_strided_loads<int32_t>(r);
	check_strided_loads<int16_t>(r);
	check_strided_loads<int8_t>(r);
	check_strided_loads<float>(r);
	}

	DEF_TEST(SkVx_ScaledDividerU32, r) {
	static constexpr uint32_t kMax = std::numeric_limits<uint32_t>::max();

	auto errorBounds = [&](uint32_t actual, uint32_t expected) {
	uint32_t lowerLimit = expected == 0 ? 0 : expected - 1,
	upperLimit = expected == kMax ? kMax : expected + 1;
	return lowerLimit <= actual && actual <= upperLimit;
	};

	auto test = [&](uint32_t denom) {
	// half == 1 so, the max to check is kMax-1
	ScaledDividerU32 d(denom);
	uint32_t maxCheck = static_cast<uint32_t>(
	std::floor((double)(kMax - d.half()) / denom + 0.5));
	REPORTER_ASSERT(r, errorBounds(d.divide((kMax))[0], maxCheck));
	for (uint32_t i = 0; i < kMax - d.half(); i += 65535) {
	uint32_t expected = static_cast<uint32_t>(std::floor((double)i / denom + 0.5));
	auto actual = d.divide(i + d.half());
	if (!errorBounds(actual[0], expected)) {
	SkDebugf("i: %u expected: %u actual: %u\n", i, expected, actual[0]);
	}
	// Make sure all the lanes are the same.
	for (int e = 1; e < 4; e++) {
	SkASSERT(actual[0] == actual[e]);
	}
	}
	};

	test(2);
	test(3);
	test(5);
	test(7);
	test(27);
	test(65'535);
	test(15'485'863);
	test(512'927'377);
	}

	DEF_TEST(SkVx_saturated_add, r) {
	for (int a = 0; a < (1<<8); a++) {
	for (int b = 0; b < (1<<8); b++) {
	int exact = a+b;
	if (exact > 255) { exact = 255; }
	if (exact < 0) { exact = 0; }

	REPORTER_ASSERT(r, saturated_add(skvx::byte16(a), skvx::byte16(b))[0] == exact);
	}
	}
	}

	DEF_TEST(SkVx_length, r) {
	auto assertFloatsEqual = [&](float left, float right) {
	REPORTER_ASSERT(r, SkScalarNearlyEqual(left, right), "%f != %f", left, right);
	};
	auto assertDoublesEqual = [&](double left, double right) {
	REPORTER_ASSERT(r, SkScalarNearlyEqual(left, right), "%f != %f", left, right);
	};

	assertFloatsEqual(length(float2{0, 1}), 1.000000f);
	assertFloatsEqual(length(float2{2, 0}), 2.000000f);
	assertFloatsEqual(length(float2{3, 4}), 5.000000f);
	assertFloatsEqual(length(float2{1, 1}), 1.414214f);
	assertFloatsEqual(length(float2{2.5f, 2.5f}), 3.535534f);
	assertFloatsEqual(length(float4{1, 2, 3, 4}), 5.477226f);

	assertDoublesEqual(length(double2{2.5, 2.5}), 3.535534);
	assertDoublesEqual(length(double4{1.5, 2.5, 3.5, 4.5}), 6.403124);
	}

	DEF_TEST(SkVx_normalize, r) {
	auto assertFloatsEqual = [&](float left, float right) {
	REPORTER_ASSERT(r, SkScalarNearlyEqual(left, right), "%f != %f", left, right);
	};
	auto assertDoublesEqual = [&](double left, double right) {
	REPORTER_ASSERT(r, SkScalarNearlyEqual(left, right), "%f != %f", left, right);
	};

	skvx::float2 twoFloats = normalize(skvx::float2{1.2f, 3.4f});
	assertFloatsEqual(twoFloats[0], 0.332820f);
	assertFloatsEqual(twoFloats[1], 0.942990f);

	skvx::double2 twoDoubles = normalize(skvx::double2{2.3, -4.5});
	assertDoublesEqual(twoDoubles[0], 0.455111);
	assertDoublesEqual(twoDoubles[1], -0.890435);

	skvx::double4 fourDoubles = normalize(skvx::double4{1.2, 3.4, 5.6, 7.8});
	assertDoublesEqual(fourDoubles[0], 0.116997);
	assertDoublesEqual(fourDoubles[1], 0.331490);
	assertDoublesEqual(fourDoubles[2], 0.545984);
	assertDoublesEqual(fourDoubles[3], 0.760478);
	}

	DEF_TEST(SkVx_normalize_infinity_and_nan, r) {
	skvx::float2 zeroLenVec = normalize(skvx::float2{0, 0});
	REPORTER_ASSERT(r, std::isnan(zeroLenVec[0]), "%f is not nan", zeroLenVec[0]);
	REPORTER_ASSERT(r, std::isnan(zeroLenVec[1]), "%f is not nan", zeroLenVec[1]);
	REPORTER_ASSERT(r, !isfinite(zeroLenVec));

	skvx::float2 tooBigVec = normalize(skvx::float2{std::numeric_limits<float>::max(),
	std::numeric_limits<float>::max()});
	REPORTER_ASSERT(r, tooBigVec[0] == 0, "%f != 0", tooBigVec[0]);
	REPORTER_ASSERT(r, tooBigVec[1] == 0, "%f != 0", tooBigVec[1]);

	skvx::double2 tooBigVecD = normalize(skvx::double2{std::numeric_limits<double>::max(),
	std::numeric_limits<double>::max()});
	REPORTER_ASSERT(r, tooBigVecD[0] == 0, "%f != 0", tooBigVecD[0]);
	REPORTER_ASSERT(r, tooBigVecD[1] == 0, "%f != 0", tooBigVecD[1]);
	}

	DEF_TEST(SkVx_isfinite, r) {
	REPORTER_ASSERT(r, isfinite(skvx::float2{0, 0}));
	REPORTER_ASSERT(r, isfinite(skvx::double4{1.2, 3.4, 5.6, 7.8}));
	REPORTER_ASSERT(r, isfinite(skvx::float8{8, 7, 6, 5, 4, 3, 2, 1}));

	REPORTER_ASSERT(r, !isfinite(skvx::float2{0, NAN}));
	REPORTER_ASSERT(r, !isfinite(skvx::float2{INFINITY, 10}));
	REPORTER_ASSERT(r, !isfinite(skvx::float2{NAN, INFINITY}));

	for (int i = 0; i < 4; i++) {
	auto v = skvx::double4{4, 3, 2, 1};
	v[i] = INFINITY;
	REPORTER_ASSERT(r, !isfinite(v), "index %d INFINITY", i);
	v[i] = NAN;
	REPORTER_ASSERT(r, !isfinite(v), "index %d NAN", i);
	}

	for (int i = 0; i < 8; i++) {
	auto v = skvx::float8{8, 7, 6, 5, 4, 3, 2, 1};
	v[i] = INFINITY;
	REPORTER_ASSERT(r, !isfinite(v), "index %d INFINITY", i);
	v[i] = NAN;
	REPORTER_ASSERT(r, !isfinite(v), "index %d NAN", i);
	}
	}

	} // namespace skvx