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Merge pull request #2522 from dneto0/intlog2

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Add IntLog2 and use it
This commit is contained in:
Greg Fischer 2021-04-14 15:16:04 -06:00 committed by GitHub
commit e7e4a8eecb
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4 changed files with 179 additions and 8 deletions
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12
glslang/Include/Common.h
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@ -286,6 +286,18 @@ template <class T> bool IsMultipleOfPow2(T number, int powerOf2)
return ! (number & (powerOf2 - 1));
}
// Returns log2 of an integer power of 2.
// T should be integral.
template <class T> int IntLog2(T n)
{
assert(IsPow2(n));
int result = 0;
while ((T(1) << result) != n) {
result++;
}
return result;
}
} // end namespace glslang
#endif // _COMMON_INCLUDED_

9
glslang/MachineIndependent/ParseHelper.cpp
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@ -5602,14 +5602,7 @@ void TParseContext::setLayoutQualifier(const TSourceLoc& loc, TPublicType& publi
if (! IsPow2(value))
error(loc, "must be a power of 2", "buffer_reference_align", "");
else
#ifdef __ANDROID__
// Android NDK r15c tageting ABI 15 doesn't have full support for C++11
// (no std::exp2/log2). ::exp2 is available from C99 but ::log2 isn't
// available up until ABI 18 so we use the mathematical equivalent form
publicType.qualifier.layoutBufferReferenceAlign = (unsigned int)(std::log(value) / std::log(2.0));
#else
publicType.qualifier.layoutBufferReferenceAlign = (unsigned int)std::log2(value);
#endif
publicType.qualifier.layoutBufferReferenceAlign = IntLog2(value);
if (nonLiteral)
error(loc, "needs a literal integer", "buffer_reference_align", "");
return;

1
gtests/CMakeLists.txt
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@ -47,6 +47,7 @@ if(BUILD_TESTING)
# Test related source files
${CMAKE_CURRENT_SOURCE_DIR}/AST.FromFile.cpp
${CMAKE_CURRENT_SOURCE_DIR}/BuiltInResource.FromFile.cpp
${CMAKE_CURRENT_SOURCE_DIR}/Common.cpp
${CMAKE_CURRENT_SOURCE_DIR}/Config.FromFile.cpp
${CMAKE_CURRENT_SOURCE_DIR}/HexFloat.cpp
${CMAKE_CURRENT_SOURCE_DIR}/Hlsl.FromFile.cpp

165
gtests/Common.cpp Normal file
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@ -0,0 +1,165 @@
// Copyright (c) 2021 Google LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include <cstdint>
#include <gmock/gmock.h>
#include "glslang/Include/Common.h"
namespace {
TEST(IsPow2, Int_Negative) {
EXPECT_EQ(false, glslang::IsPow2(-5));
EXPECT_EQ(false, glslang::IsPow2(-1));
EXPECT_EQ(false, glslang::IsPow2(INT_MIN));
EXPECT_EQ(false, glslang::IsPow2(int64_t(-10)));
}
TEST(IsPow2, Zero) {
EXPECT_EQ(false, glslang::IsPow2(0));
EXPECT_EQ(false, glslang::IsPow2(0u));
EXPECT_EQ(false, glslang::IsPow2(0));
EXPECT_EQ(false, glslang::IsPow2(uint64_t(0)));
EXPECT_EQ(false, glslang::IsPow2(int64_t(0)));
}
TEST(IsPow2, Int_Positive_PowersOf2) {
EXPECT_EQ(true, glslang::IsPow2(1));
EXPECT_EQ(true, glslang::IsPow2(2));
EXPECT_EQ(true, glslang::IsPow2(4));
EXPECT_EQ(true, glslang::IsPow2(8));
EXPECT_EQ(true, glslang::IsPow2(16));
EXPECT_EQ(true, glslang::IsPow2(32768));
EXPECT_EQ(true, glslang::IsPow2(65536));
EXPECT_EQ(true, glslang::IsPow2(2147483648));
}
TEST(IsPow2, Int_Positive_NonPowersOf2) {
EXPECT_EQ(false, glslang::IsPow2(3));
EXPECT_EQ(false, glslang::IsPow2(5));
EXPECT_EQ(false, glslang::IsPow2(2147483647));
}
TEST(IsPow2, Uint_Positive_PowersOf2) {
EXPECT_EQ(true, glslang::IsPow2(1u));
EXPECT_EQ(true, glslang::IsPow2(2u));
EXPECT_EQ(true, glslang::IsPow2(4u));
EXPECT_EQ(true, glslang::IsPow2(8u));
EXPECT_EQ(true, glslang::IsPow2(16u));
EXPECT_EQ(true, glslang::IsPow2(32768u));
EXPECT_EQ(true, glslang::IsPow2(65536u));
EXPECT_EQ(true, glslang::IsPow2(2147483648u));
}
TEST(IsPow2, Uint_Positive_NonPowersOf2) {
EXPECT_EQ(false, glslang::IsPow2(3u));
EXPECT_EQ(false, glslang::IsPow2(5u));
EXPECT_EQ(false, glslang::IsPow2(2147483647u));
}
TEST(IntLog2, Int) {
EXPECT_EQ(0, glslang::IntLog2(1));
EXPECT_EQ(1, glslang::IntLog2(2));
EXPECT_EQ(2, glslang::IntLog2(4));
EXPECT_EQ(3, glslang::IntLog2(8));
EXPECT_EQ(4, glslang::IntLog2(16));
EXPECT_EQ(5, glslang::IntLog2(32));
EXPECT_EQ(6, glslang::IntLog2(64));
EXPECT_EQ(7, glslang::IntLog2(128));
EXPECT_EQ(8, glslang::IntLog2(256));
EXPECT_EQ(9, glslang::IntLog2(512));
EXPECT_EQ(10, glslang::IntLog2(1024));
EXPECT_EQ(11, glslang::IntLog2(2048));
EXPECT_EQ(12, glslang::IntLog2(0x1000));
EXPECT_EQ(13, glslang::IntLog2(0x2000));
EXPECT_EQ(14, glslang::IntLog2(0x4000));
EXPECT_EQ(15, glslang::IntLog2(0x8000));
EXPECT_EQ(16, glslang::IntLog2(0x10000));
EXPECT_EQ(17, glslang::IntLog2(0x20000));
EXPECT_EQ(18, glslang::IntLog2(0x40000));
EXPECT_EQ(19, glslang::IntLog2(0x80000));
EXPECT_EQ(20, glslang::IntLog2(0x100000));
EXPECT_EQ(21, glslang::IntLog2(0x200000));
EXPECT_EQ(22, glslang::IntLog2(0x400000));
EXPECT_EQ(23, glslang::IntLog2(0x800000));
EXPECT_EQ(24, glslang::IntLog2(0x1000000));
EXPECT_EQ(25, glslang::IntLog2(0x2000000));
EXPECT_EQ(26, glslang::IntLog2(0x4000000));
EXPECT_EQ(27, glslang::IntLog2(0x8000000));
EXPECT_EQ(28, glslang::IntLog2(0x10000000));
EXPECT_EQ(29, glslang::IntLog2(0x20000000));
EXPECT_EQ(30, glslang::IntLog2(0x40000000));
}
TEST(IntLog2, Uint) {
EXPECT_EQ(0, glslang::IntLog2(1u));
EXPECT_EQ(1, glslang::IntLog2(2u));
EXPECT_EQ(2, glslang::IntLog2(4u));
EXPECT_EQ(3, glslang::IntLog2(8u));
EXPECT_EQ(4, glslang::IntLog2(16u));
EXPECT_EQ(5, glslang::IntLog2(32u));
EXPECT_EQ(6, glslang::IntLog2(64u));
EXPECT_EQ(7, glslang::IntLog2(128u));
EXPECT_EQ(8, glslang::IntLog2(256u));
EXPECT_EQ(9, glslang::IntLog2(512u));
EXPECT_EQ(10, glslang::IntLog2(1024u));
EXPECT_EQ(11, glslang::IntLog2(2048u));
EXPECT_EQ(12, glslang::IntLog2(0x1000u));
EXPECT_EQ(13, glslang::IntLog2(0x2000u));
EXPECT_EQ(14, glslang::IntLog2(0x4000u));
EXPECT_EQ(15, glslang::IntLog2(0x8000u));
EXPECT_EQ(16, glslang::IntLog2(0x10000u));
EXPECT_EQ(17, glslang::IntLog2(0x20000u));
EXPECT_EQ(18, glslang::IntLog2(0x40000u));
EXPECT_EQ(19, glslang::IntLog2(0x80000u));
EXPECT_EQ(20, glslang::IntLog2(0x100000u));
EXPECT_EQ(21, glslang::IntLog2(0x200000u));
EXPECT_EQ(22, glslang::IntLog2(0x400000u));
EXPECT_EQ(23, glslang::IntLog2(0x800000u));
EXPECT_EQ(24, glslang::IntLog2(0x1000000u));
EXPECT_EQ(25, glslang::IntLog2(0x2000000u));
EXPECT_EQ(26, glslang::IntLog2(0x4000000u));
EXPECT_EQ(27, glslang::IntLog2(0x8000000u));
EXPECT_EQ(28, glslang::IntLog2(0x10000000u));
EXPECT_EQ(29, glslang::IntLog2(0x20000000u));
EXPECT_EQ(30, glslang::IntLog2(0x40000000u));
EXPECT_EQ(31, glslang::IntLog2(0x80000000u));
}
TEST(IntLog2, Int64) {
EXPECT_EQ(0, glslang::IntLog2(int64_t(1)));
EXPECT_EQ(1, glslang::IntLog2(int64_t(2)));
EXPECT_EQ(2, glslang::IntLog2(int64_t(4)));
EXPECT_EQ(3, glslang::IntLog2(int64_t(8)));
EXPECT_EQ(30, glslang::IntLog2(int64_t(0x40000000u)));
EXPECT_EQ(31, glslang::IntLog2(int64_t(0x80000000u)));
EXPECT_EQ(32, glslang::IntLog2(int64_t(0x10000) * int64_t(0x10000)));
EXPECT_EQ(48, glslang::IntLog2(int64_t(0x10000) * int64_t(0x10000) * int64_t(0x10000)));
EXPECT_EQ(62, glslang::IntLog2(int64_t(0x10000) * int64_t(0x10000) * int64_t(0x10000) * int64_t(0x4000)));
}
TEST(IntLog2, Uint64) {
EXPECT_EQ(0, glslang::IntLog2(uint64_t(1)));
EXPECT_EQ(1, glslang::IntLog2(uint64_t(2)));
EXPECT_EQ(2, glslang::IntLog2(uint64_t(4)));
EXPECT_EQ(3, glslang::IntLog2(uint64_t(8)));
EXPECT_EQ(30, glslang::IntLog2(uint64_t(0x40000000u)));
EXPECT_EQ(31, glslang::IntLog2(uint64_t(0x80000000u)));
EXPECT_EQ(32, glslang::IntLog2(uint64_t(0x10000) * uint64_t(0x10000)));
EXPECT_EQ(48, glslang::IntLog2(uint64_t(0x10000) * uint64_t(0x10000) * uint64_t(0x10000)));
EXPECT_EQ(62, glslang::IntLog2(uint64_t(0x10000) * uint64_t(0x10000) * uint64_t(0x10000) * uint64_t(0x4000)));
EXPECT_EQ(63, glslang::IntLog2(uint64_t(0x10000) * uint64_t(0x10000) * uint64_t(0x10000) * uint64_t(0x8000)));
}
} // anonymous namespace