[mono] Don't use recursion in mono_ssa_rename_vars #61677
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Implements dotnet#60266 Avoid deep recursion in mono_ssa_rename_vars, change the way we traverse dominated bb's. Instead of using recursion, use stack like array to store information about stack history and the traversal. The performance remains the same (or is slightly better) than before. Times for the compilation of repro from dotnet#57141 (JIT time minimum from 5 runs): Before: LLVM output file: './Uno.UI.FluentTheme.dll.bc.tmp'. JIT time: 4810 ms, Generation time: 2040 ms, Assembly+Link time: 2 ms. After: LLVM output file: './Uno.UI.FluentTheme.dll.bc.tmp'. JIT time: 4781 ms, Generation time: 2017 ms, Assembly+Link time: 2 ms.
radekdoulik
requested review from
imhameed,
lambdageek and
SamMonoRT
as code owners
lewing
approved these changes
Nov 17, 2021
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imhameed
suggested changes
Nov 22, 2021
Co-authored-by: imhameed <imhameed@microsoft.com>
imhameed
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Nov 23, 2021
This was referenced Nov 29, 2021
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Implements #60266
Avoid deep recursion in
mono_ssa_rename_vars, change the way we traversedominated bb's. Instead of using recursion, use stack-like array to
store information about stack history and the traversal.
The performance remains the same (or is slightly better) than before.
Times for the compilation of repro from #57141
(JIT time minimum from 5 runs):
Before:
After: