[all-commits] [llvm/llvm-project] 18fe01: [flang][runtime] Formatted input optimizations (#1...

[Peter Klausler via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 18fe0124e7abbaba64db5793503cc86cb52965d8
      https://github.com/llvm/llvm-project/commit/18fe0124e7abbaba64db5793503cc86cb52965d8
  Author: Peter Klausler <pklausler at nvidia.com>
  Date:   2025-04-10 (Thu, 10 Apr 2025)

  Changed paths:
    M flang-rt/include/flang-rt/runtime/connection.h
    M flang-rt/include/flang-rt/runtime/io-stmt.h
    M flang-rt/lib/runtime/connection.cpp
    M flang-rt/lib/runtime/edit-input.cpp
    M flang-rt/lib/runtime/io-api.cpp
    M flang-rt/lib/runtime/io-stmt.cpp
    M flang-rt/lib/runtime/unit.cpp
    M flang/include/flang/Common/uint128.h

  Log Message:
  -----------
  [flang][runtime] Formatted input optimizations (#134715)

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 https://github.com/llvm/llvm-project/issues/134026.



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