134 lines
3.9 KiB
C++
134 lines
3.9 KiB
C++
/*
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* Copyright © 2021 Intel Corporation
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice (including the next
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* paragraph) shall be included in all copies or substantial portions of the
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* Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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* IN THE SOFTWARE.
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*/
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#include <math.h>
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#include <gtest/gtest.h>
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#include "util/half_float.h"
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#include "util/u_math.h"
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/* math.h has some defines for these, but they have some compiler dependencies
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* and can potentially raise exceptions.
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*/
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#define TEST_POS_INF (uif(0x7f800000))
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#define TEST_NEG_INF (uif(0xff800000))
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#define TEST_NAN (uif(0x7fc00000))
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#define HALF_POS_INF 0x7c00
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#define HALF_NEG_INF 0xfc00
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#define HALF_NAN 0x7e00
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#ifndef HAVE_ISSIGNALING
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static bool issignaling(float x)
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{
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uint32_t ui = fui(x);
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return (((ui >> 23) & 0xff) == 0xff) && !(ui & (1 << 22));
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}
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#endif
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/* Sanity test our test values */
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TEST(half_to_float_test, nan_test)
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{
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EXPECT_TRUE(isinf(TEST_POS_INF));
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EXPECT_TRUE(isinf(TEST_NEG_INF));
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EXPECT_TRUE(isnan(TEST_NAN));
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/* Make sure that our 32-bit float nan test value we're using is a
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* non-signaling NaN. The sign of the bit for signaling was apparently
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* different on some old processors (PA-RISC, MIPS?). This test value should
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* cover Intel, ARM, and PPC, for sure.
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*/
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EXPECT_FALSE(issignaling(TEST_NAN));
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}
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static void
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test_half_to_float_limits(float (*func)(uint16_t))
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{
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/* Positive and negative 0. */
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EXPECT_EQ(func(0), 0.0f);
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EXPECT_EQ(fui(func(0x8000)), fui(-0.0f));
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/* Max normal number */
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EXPECT_EQ(func(0x7bff), 65504.0f);
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float nan = func(HALF_NAN);
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EXPECT_TRUE(isnan(nan));
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EXPECT_FALSE(issignaling(nan));
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/* inf */
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EXPECT_EQ(func(HALF_POS_INF), TEST_POS_INF);
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/* -inf */
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EXPECT_EQ(func(HALF_NEG_INF), TEST_NEG_INF);
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}
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/* Test the optionally HW instruction-using path. */
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TEST(half_to_float_test, half_to_float_test)
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{
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test_half_to_float_limits(_mesa_half_to_float);
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}
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TEST(half_to_float_test, half_to_float_slow_test)
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{
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test_half_to_float_limits(_mesa_half_to_float_slow);
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}
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static void
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test_float_to_half_limits(uint16_t (*func)(float))
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{
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/* Positive and negative 0. */
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EXPECT_EQ(func(0.0f), 0);
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EXPECT_EQ(func(-0.0f), 0x8000);
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/* Max normal number */
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EXPECT_EQ(func(65504.0f), 0x7bff);
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uint16_t nan = func(TEST_NAN);
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EXPECT_EQ((nan & 0xfc00), 0x7c00); /* exponent is all 1s */
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EXPECT_TRUE(nan & (1 << 9)); /* mantissa is quiet nan */
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EXPECT_EQ(func(TEST_POS_INF), HALF_POS_INF);
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EXPECT_EQ(func(TEST_NEG_INF), HALF_NEG_INF);
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}
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TEST(float_to_half_test, float_to_half_test)
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{
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test_float_to_half_limits(_mesa_float_to_half);
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}
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TEST(float_to_float16_rtne_test, float_to_float16_rtne_test)
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{
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test_float_to_half_limits(_mesa_float_to_float16_rtne);
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}
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/* no rtne_slow variant -- rtne is just _mesa_float_to_half(). */
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TEST(float_to_float16_rtz_test, float_to_float16_rtz_test)
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{
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test_float_to_half_limits(_mesa_float_to_float16_rtz);
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}
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TEST(float_to_float16_rtz_slow_test, float_to_float16_rtz_test)
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{
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test_float_to_half_limits(_mesa_float_to_float16_rtz_slow);
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}
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