Campbell Barton
c434782e3a
Use a shorter/simpler license convention, stops the header taking so much space. Follow the SPDX license specification: https://spdx.org/licenses - C/C++/objc/objc++ - Python - Shell Scripts - CMake, GNUmakefile While most of the source tree has been included - `./extern/` was left out. - `./intern/cycles` & `./intern/atomic` are also excluded because they use different header conventions. doc/license/SPDX-license-identifiers.txt has been added to list SPDX all used identifiers. See P2788 for the script that automated these edits. Reviewed By: brecht, mont29, sergey Ref D14069
134 lines
4.3 KiB
C++
134 lines
4.3 KiB
C++
/* SPDX-License-Identifier: Apache-2.0 */
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#include "testing/testing.h"
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#include "BLI_math.h"
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/* In tests below, when we are using -1.0f as max_diff value, we actually turn the function into a
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* pure-ULP one. */
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/* Put this here, since we cannot use BLI_assert() in inline math files it seems... */
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TEST(math_base, CompareFFRelativeValid)
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{
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EXPECT_TRUE(sizeof(float) == sizeof(int));
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}
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TEST(math_base, CompareFFRelativeNormal)
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{
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float f1 = 1.99999988f; /* *(float *)&(*(int *)&f2 - 1) */
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float f2 = 2.00000000f;
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float f3 = 2.00000048f; /* *(float *)&(*(int *)&f2 + 2) */
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float f4 = 2.10000000f; /* *(float *)&(*(int *)&f2 + 419430) */
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const float max_diff = FLT_EPSILON * 0.1f;
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EXPECT_TRUE(compare_ff_relative(f1, f2, max_diff, 1));
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EXPECT_TRUE(compare_ff_relative(f2, f1, max_diff, 1));
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EXPECT_TRUE(compare_ff_relative(f3, f2, max_diff, 2));
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EXPECT_TRUE(compare_ff_relative(f2, f3, max_diff, 2));
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EXPECT_FALSE(compare_ff_relative(f3, f2, max_diff, 1));
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EXPECT_FALSE(compare_ff_relative(f2, f3, max_diff, 1));
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EXPECT_FALSE(compare_ff_relative(f3, f2, -1.0f, 1));
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EXPECT_FALSE(compare_ff_relative(f2, f3, -1.0f, 1));
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EXPECT_TRUE(compare_ff_relative(f3, f2, -1.0f, 2));
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EXPECT_TRUE(compare_ff_relative(f2, f3, -1.0f, 2));
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EXPECT_FALSE(compare_ff_relative(f4, f2, max_diff, 64));
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EXPECT_FALSE(compare_ff_relative(f2, f4, max_diff, 64));
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EXPECT_TRUE(compare_ff_relative(f1, f3, max_diff, 64));
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EXPECT_TRUE(compare_ff_relative(f3, f1, max_diff, 64));
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}
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TEST(math_base, CompareFFRelativeZero)
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{
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float f0 = 0.0f;
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float f1 = 4.2038954e-045f; /* *(float *)&(*(int *)&f0 + 3) */
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float fn0 = -0.0f;
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float fn1 = -2.8025969e-045f; /* *(float *)&(*(int *)&fn0 - 2) */
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const float max_diff = FLT_EPSILON * 0.1f;
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EXPECT_TRUE(compare_ff_relative(f0, f1, -1.0f, 3));
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EXPECT_TRUE(compare_ff_relative(f1, f0, -1.0f, 3));
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EXPECT_FALSE(compare_ff_relative(f0, f1, -1.0f, 1));
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EXPECT_FALSE(compare_ff_relative(f1, f0, -1.0f, 1));
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EXPECT_TRUE(compare_ff_relative(fn0, fn1, -1.0f, 8));
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EXPECT_TRUE(compare_ff_relative(fn1, fn0, -1.0f, 8));
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EXPECT_TRUE(compare_ff_relative(f0, f1, max_diff, 1));
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EXPECT_TRUE(compare_ff_relative(f1, f0, max_diff, 1));
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EXPECT_TRUE(compare_ff_relative(fn0, f0, max_diff, 1));
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EXPECT_TRUE(compare_ff_relative(f0, fn0, max_diff, 1));
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EXPECT_TRUE(compare_ff_relative(f0, fn1, max_diff, 1));
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EXPECT_TRUE(compare_ff_relative(fn1, f0, max_diff, 1));
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/* NOTE: in theory, this should return false, since 0.0f and -0.0f have 0x80000000 diff,
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* but overflow in subtraction seems to break something here
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* (abs(*(int *)&fn0 - *(int *)&f0) == 0x80000000 == fn0), probably because int32 cannot
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* hold this abs value. this is yet another illustration of why one shall never use (near-)zero
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* floats in pure-ULP comparison. */
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// EXPECT_FALSE(compare_ff_relative(fn0, f0, -1.0f, 1024));
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// EXPECT_FALSE(compare_ff_relative(f0, fn0, -1.0f, 1024));
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EXPECT_FALSE(compare_ff_relative(fn0, f1, -1.0f, 1024));
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EXPECT_FALSE(compare_ff_relative(f1, fn0, -1.0f, 1024));
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}
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TEST(math_base, Log2FloorU)
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{
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EXPECT_EQ(log2_floor_u(0), 0);
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EXPECT_EQ(log2_floor_u(1), 0);
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EXPECT_EQ(log2_floor_u(2), 1);
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EXPECT_EQ(log2_floor_u(3), 1);
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EXPECT_EQ(log2_floor_u(4), 2);
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EXPECT_EQ(log2_floor_u(5), 2);
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EXPECT_EQ(log2_floor_u(6), 2);
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EXPECT_EQ(log2_floor_u(7), 2);
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EXPECT_EQ(log2_floor_u(8), 3);
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EXPECT_EQ(log2_floor_u(9), 3);
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EXPECT_EQ(log2_floor_u(123456), 16);
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}
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TEST(math_base, Log2CeilU)
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{
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EXPECT_EQ(log2_ceil_u(0), 0);
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EXPECT_EQ(log2_ceil_u(1), 0);
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EXPECT_EQ(log2_ceil_u(2), 1);
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EXPECT_EQ(log2_ceil_u(3), 2);
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EXPECT_EQ(log2_ceil_u(4), 2);
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EXPECT_EQ(log2_ceil_u(5), 3);
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EXPECT_EQ(log2_ceil_u(6), 3);
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EXPECT_EQ(log2_ceil_u(7), 3);
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EXPECT_EQ(log2_ceil_u(8), 3);
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EXPECT_EQ(log2_ceil_u(9), 4);
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EXPECT_EQ(log2_ceil_u(123456), 17);
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}
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TEST(math_base, CeilPowerOf10)
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{
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EXPECT_EQ(ceil_power_of_10(0), 0);
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EXPECT_EQ(ceil_power_of_10(1), 1);
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EXPECT_EQ(ceil_power_of_10(1e-6f), 1e-6f);
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EXPECT_NEAR(ceil_power_of_10(100.1f), 1000.0f, 1e-4f);
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EXPECT_NEAR(ceil_power_of_10(99.9f), 100.0f, 1e-4f);
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}
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TEST(math_base, FloorPowerOf10)
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{
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EXPECT_EQ(floor_power_of_10(0), 0);
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EXPECT_EQ(floor_power_of_10(1), 1);
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EXPECT_EQ(floor_power_of_10(1e-6f), 1e-6f);
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EXPECT_NEAR(floor_power_of_10(100.1f), 100.0f, 1e-4f);
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EXPECT_NEAR(floor_power_of_10(99.9f), 10.0f, 1e-4f);
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}
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