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20 hours ago •
dotnet
dotnet
Math.Atan2(float, float) 20% slower on macOS
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Math.Atan2(float, float) has become 20% slower compared to 5.0. This regression is specific to macOS, other configs are not affected.
Repro
git clone https://github.com/dotnet/performance.git
python3 ./performance/scripts/benchmarks_ci.py -f net5.0 net6.0 --filter System.MathBenchmarks.Single.Atan2
Full data from the most recent comparison
| Result | Base | Diff | Ratio | Alloc Delta | Modality | Operating System | Bit | Processor Name | Base V | Diff V |
|---|---|---|---|---|---|---|---|---|---|---|
| Same | 59754.62 | 61630.79 | 0.97 | +0 | Windows 10.0.19042 | X64 | AMD Ryzen Threadripper 2990WX | 5.0.421.11614 | 6.0.21.16201 | |
| Same | 50559.30 | 50670.28 | 1.00 | +0 | Windows 10.0.21337 | X64 | AMD Ryzen 9 3900X | 5.0.421.11614 | 6.0.21.16701 | |
| Same | 52376.47 | 53374.19 | 0.98 | +0 | Windows 10.0.21337 | X64 | AMD Ryzen Threadripper 3990X | 5.0.421.11614 | 6.0.21.16701 | |
| Same | 57494.28 | 57049.94 | 1.01 | +0 | Windows 10.0.18363.1440 | X64 | Intel Xeon CPU E5-1650 v4 3.60GHz | 5.0.421.11614 | 6.0.21.16201 | |
| Same | 354537.08 | 353258.81 | 1.00 | +0 | Windows 10.0.21337 | X64 | Intel Core i5-4300U CPU 1.90GHz (Haswell) | 5.0.421.11614 | 6.0.21.16701 | |
| Same | 60440.94 | 58325.99 | 1.04 | +0 | Windows 10.0.19042 | X64 | Intel Core i7-6700 CPU 3.40GHz (Skylake) | 5.0.421.11614 | 6.0.21.16201 | |
| Same | 63741.10 | 57937.25 | 1.10 | +0 | Windows 10.0.19042 | X64 | Intel Core i7-7700 CPU 3.60GHz (Kaby Lake) | 5.0.421.11614 | 6.0.21.16201 | |
| Same | 70574.55 | 69330.90 | 1.02 | +0 | Windows 10.0.19042 | X64 | Intel Core i7-8650U CPU 1.90GHz (Kaby Lake R) | 5.0.421.11614 | 6.0.21.16408 | |
| Same | 51427.55 | 50918.57 | 1.01 | +0 | Windows 10.0.19042 | X64 | Intel Core i7-8700 CPU 3.20GHz (Coffee Lake) | 5.0.421.11614 | 6.0.21.16201 | |
| Same | 51693.97 | 52342.48 | 0.99 | +0 | Windows 10.0.19042 | X64 | Intel Core i7-8700 CPU 3.20GHz (Coffee Lake) | 5.0.421.11614 | 6.0.21.16408 | |
| Same | 323621.43 | 325226.02 | 1.00 | +0 | Windows 10.0.19042 | X64 | Intel Atom x7-Z8700 CPU 1.60GHz | 5.0.421.11614 | 6.0.21.16309 | |
| Same | 69054.19 | 70118.82 | 0.98 | +0 | ubuntu 18.04 | X64 | Intel Xeon CPU E5-1650 v4 3.60GHz | 5.0.421.11614 | 6.0.21.16309 | |
| Same | 54402.62 | 56148.72 | 0.97 | +0 | alpine 3.11 | X64 | Intel Core i7-7700 CPU 3.60GHz (Kaby Lake) | 5.0.421.11614 | 6.0.21.16601 | |
| Same | 138361.09 | 138052.63 | 1.00 | +0 | ubuntu 16.04 | Arm64 | Unknown processor | 5.0.421.11614 | 6.0.21.17806 | |
| Same | 138435.05 | 138027.53 | 1.00 | +0 | ubuntu 16.04 | Arm64 | Unknown processor | 5.0.421.11614 | 6.0.21.17806 | |
| Same | 83156.15 | 85778.62 | 0.97 | +0 | Windows 10.0.19042 | Arm64 | Microsoft SQ1 3.0 GHz | 5.0.421.11614 | 6.0.21.16309 | |
| Same | 84458.32 | 84261.45 | 1.00 | +0 | Windows 10.0.19042 | Arm64 | Microsoft SQ1 3.0 GHz | 5.0.421.11614 | 6.0.21.16201 | |
| Same | 352665.69 | 334173.01 | 1.06 | +0 | Windows 10.0.18363.1440 | X86 | Intel Xeon CPU E5-1650 v4 3.60GHz | 5.0.421.11614 | 6.0.21.16701 | |
| Same | 95863.96 | 92262.87 | 1.04 | +0 | Windows 10.0.19042.867 | Arm | Microsoft SQ1 3.0 GHz | 5.0.421.11614 | 6.0.21.17905 | |
| Slower | 25241.56 | 28955.81 | 0.87 | +0 | macOS 11.2 | X64 | Intel Core i5-4278U CPU 2.60GHz (Haswell) | 5.0.421.11614 | 6.0.21.16408 | |
| Slower | 24702.31 | 28946.34 | 0.85 | +0 | macOS 11.2.3 | X64 | Intel Core i5-4278U CPU 2.60GHz (Haswell) | 5.0.421.11614 | 6.0.21.16601 | |
| Slower | 20871.07 | 26153.08 | 0.80 | +0 | macOS 11.2.2 | X64 | Intel Core i7-4870HQ CPU 2.50GHz (Haswell) | 5.0.421.11614 | 6.0.21.16601 | |
| Slower | 21634.97 | 26322.87 | 0.82 | +0 | macOS Mojave 10.14.5 | X64 | Intel Core i7-5557U CPU 3.10GHz (Broadwell) | 5.0.421.11614 | 6.0.21.16309 |
The same is true for System.MathBenchmarks.Double.ILogB and System.MathBenchmarks.Single.ILogB
| Result | Base | Diff | Ratio | Alloc Delta | Modality | Operating System | Bit | Processor Name | Base V | Diff V |
|---|---|---|---|---|---|---|---|---|---|---|
| Same | 23985.50 | 23816.35 | 1.01 | +0 | Windows 10.0.19042 | X64 | AMD Ryzen Threadripper 2990WX | 5.0.421.11614 | 6.0.21.16201 | |
| Same | 23344.49 | 22061.87 | 1.06 | +0 | Windows 10.0.21337 | X64 | AMD Ryzen 9 3900X | 5.0.421.11614 | 6.0.21.16701 | |
| Same | 24188.44 | 23280.07 | 1.04 | +0 | Windows 10.0.21337 | X64 | AMD Ryzen Threadripper 3990X | 5.0.421.11614 | 6.0.21.16701 | |
| Same | 25194.98 | 25259.66 | 1.00 | +0 | Windows 10.0.18363.1440 | X64 | Intel Xeon CPU E5-1650 v4 3.60GHz | 5.0.421.11614 | 6.0.21.16201 | |
| Slower | 36773.68 | 127315.15 | 0.29 | +0 | Windows 10.0.21337 | X64 | Intel Core i5-4300U CPU 1.90GHz (Haswell) | 5.0.421.11614 | 6.0.21.16701 | |
| Same | 22436.96 | 22270.67 | 1.01 | +0 | Windows 10.0.19042 | X64 | Intel Core i7-6700 CPU 3.40GHz (Skylake) | 5.0.421.11614 | 6.0.21.16201 | |
| Same | 22754.40 | 22775.53 | 1.00 | +0 | Windows 10.0.19042 | X64 | Intel Core i7-7700 CPU 3.60GHz (Kaby Lake) | 5.0.421.11614 | 6.0.21.16201 | |
| Same | 28465.67 | 24993.07 | 1.14 | +0 | Windows 10.0.19042 | X64 | Intel Core i7-8650U CPU 1.90GHz (Kaby Lake R) | 5.0.421.11614 | 6.0.21.16408 | |
| Same | 19672.70 | 19523.70 | 1.01 | +0 | Windows 10.0.19042 | X64 | Intel Core i7-8700 CPU 3.20GHz (Coffee Lake) | 5.0.421.11614 | 6.0.21.16201 | |
| Same | 21300.83 | 19252.72 | 1.11 | +0 | Windows 10.0.19042 | X64 | Intel Core i7-8700 CPU 3.20GHz (Coffee Lake) | 5.0.421.11614 | 6.0.21.16408 | |
| Same | 85033.87 | 79636.83 | 1.07 | +0 | Windows 10.0.19042 | X64 | Intel Atom x7-Z8700 CPU 1.60GHz | 5.0.421.11614 | 6.0.21.16309 | |
| Same | 38057.01 | 34240.59 | 1.11 | +0 | ubuntu 18.04 | X64 | Intel Xeon CPU E5-1650 v4 3.60GHz | 5.0.421.11614 | 6.0.21.16309 | |
| Same | 17000.50 | 16933.04 | 1.00 | +0 | alpine 3.11 | X64 | Intel Core i7-7700 CPU 3.60GHz (Kaby Lake) | 5.0.421.11614 | 6.0.21.16601 | |
| Same | 55851.19 | 55849.98 | 1.00 | +0 | ubuntu 16.04 | Arm64 | Unknown processor | 5.0.421.11614 | 6.0.21.17806 | |
| Same | 55849.94 | 55850.14 | 1.00 | +0 | ubuntu 16.04 | Arm64 | Unknown processor | 5.0.421.11614 | 6.0.21.17806 | |
| Same | 39065.69 | 39115.88 | 1.00 | +0 | Windows 10.0.19042 | Arm64 | Microsoft SQ1 3.0 GHz | 5.0.421.11614 | 6.0.21.16309 | |
| Same | 39016.62 | 39083.86 | 1.00 | +0 | Windows 10.0.19042 | Arm64 | Microsoft SQ1 3.0 GHz | 5.0.421.11614 | 6.0.21.16201 | |
| Faster | 49097.31 | 43165.08 | 1.14 | +0 | bimodal | Windows 10.0.18363.1440 | X86 | Intel Xeon CPU E5-1650 v4 3.60GHz | 5.0.421.11614 | 6.0.21.16701 |
| Same | 44076.75 | 44503.45 | 0.99 | +0 | Windows 10.0.19042.867 | Arm | Microsoft SQ1 3.0 GHz | 5.0.421.11614 | 6.0.21.17905 | |
| Slower | 19294.12 | 22633.67 | 0.85 | +0 | macOS 11.2 | X64 | Intel Core i5-4278U CPU 2.60GHz (Haswell) | 5.0.421.11614 | 6.0.21.16408 | |
| Slower | 19012.42 | 22661.16 | 0.84 | +0 | macOS 11.2.3 | X64 | Intel Core i5-4278U CPU 2.60GHz (Haswell) | 5.0.421.11614 | 6.0.21.16601 | |
| Slower | 16019.12 | 19022.00 | 0.84 | +0 | macOS 11.2.2 | X64 | Intel Core i7-4870HQ CPU 2.50GHz (Haswell) | 5.0.421.11614 | 6.0.21.16601 | |
| Slower | 16210.06 | 18808.96 | 0.86 | +0 | macOS Mojave 10.14.5 | X64 | Intel Core i7-5557U CPU 3.10GHz (Broadwell) | 5.0.421.11614 | 6.0.21.16309 |
@tannergooding macOS perf is not our top priority, but it would be good to know where the regression comes from (I guess that from the ILogB changes, but why is it slower on macOS?).
The only changes here that I'm aware of are CSE related. @adamsitnik do you have the disassembly for 5.0 vs 6.0 on hand?
