[flang][runtime] Formatted input optimizations #134715
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I'm sorry, I can't review the code because I'm not familiar with it. However, as I mentioned in #134026, I confirmed that this patch improves performance. |
eugeneepshteyn
approved these changes
Apr 8, 2025
Make some minor tweaks (inlining, caching) to the formatting input path to improve integer input in a SPEC code. (None of the I/O library has been tuned yet for performance, and there are some easy optimizations for common cases.) Input integer values are now calculated with native C/C++ 128-bit integers. A benchmark that only reads about 5M lines of three integer values each speeds up from over 8 seconds to under 3 in my environment with these changeds. If this works out, the code here can be used to optimize the formatted input paths for real and character data, too. Fixes llvm#134026.
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Make some minor tweaks (inlining, caching) to the formatting input path to improve integer input in a SPEC code. (None of the I/O library has been tuned yet for performance, and there are some easy optimizations for common cases.) Input integer values are now calculated with native C/C++ 128-bit integers.
A benchmark that only reads about 5M lines of three integer values each speeds up from over 8 seconds to under 3 in my environment with these changeds.
If this works out, the code here can be used to optimize the formatted input paths for real and character data, too.
Fixes #134026.