diff options
Diffstat (limited to 'zencore/intmath.cpp')
| -rw-r--r-- | zencore/intmath.cpp | 56 |
1 files changed, 56 insertions, 0 deletions
diff --git a/zencore/intmath.cpp b/zencore/intmath.cpp new file mode 100644 index 000000000..4039a3b39 --- /dev/null +++ b/zencore/intmath.cpp @@ -0,0 +1,56 @@ +// Copyright Epic Games, Inc. All Rights Reserved. + +#include <zencore/intmath.h> + +#include <doctest/doctest.h> + +namespace zen { + +////////////////////////////////////////////////////////////////////////// +// +// Testing related code follows... +// + +void +intmath_forcelink() +{ +} + +TEST_CASE("intmath") +{ + CHECK(FloorLog2(0x00) == 0); + CHECK(FloorLog2(0x01) == 0); + CHECK(FloorLog2(0x0f) == 3); + CHECK(FloorLog2(0x10) == 4); + CHECK(FloorLog2(0x11) == 4); + CHECK(FloorLog2(0x12) == 4); + CHECK(FloorLog2(0x22) == 5); + CHECK(FloorLog2(0x0001'0000) == 16); + CHECK(FloorLog2(0x0001'000f) == 16); + CHECK(FloorLog2(0x8000'0000) == 31); + + CHECK(FloorLog2_64(0x00ull) == 0); + CHECK(FloorLog2_64(0x01ull) == 0); + CHECK(FloorLog2_64(0x0full) == 3); + CHECK(FloorLog2_64(0x10ull) == 4); + CHECK(FloorLog2_64(0x11ull) == 4); + CHECK(FloorLog2_64(0x0001'0000ull) == 16); + CHECK(FloorLog2_64(0x0001'000full) == 16); + CHECK(FloorLog2_64(0x8000'0000ull) == 31); + CHECK(FloorLog2_64(0x0000'0001'0000'0000ull) == 32); + CHECK(FloorLog2_64(0x8000'0000'0000'0000ull) == 63); + + CHECK(CountLeadingZeros64(0x8000'0000'0000'0000ull) == 0); + CHECK(CountLeadingZeros64(0x0000'0000'0000'0000ull) == 64); + CHECK(CountLeadingZeros64(0x0000'0000'0000'0001ull) == 63); + CHECK(CountLeadingZeros64(0x0000'0000'8000'0000ull) == 32); + CHECK(CountLeadingZeros64(0x0000'0001'0000'0000ull) == 31); + + CHECK(CountTrailingZeros64(0x8000'0000'0000'0000ull) == 63); + CHECK(CountTrailingZeros64(0x0000'0000'0000'0000ull) == 64); + CHECK(CountTrailingZeros64(0x0000'0000'0000'0001ull) == 0); + CHECK(CountTrailingZeros64(0x0000'0000'8000'0000ull) == 31); + CHECK(CountTrailingZeros64(0x0000'0001'0000'0000ull) == 32); +} + +} // namespace zen |