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py/asmrv32: Make lt/le comparisons emitter shorter. #17652

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@agatti agatti commented Jul 9, 2025

Summary

This PR simplifies the emitter code (not the emitted code) in charge of generating opcodes performing less-than and less-than-or-equal comparisons.

By rewriting the SLT/SLTU opcode generator (handling less-than comparisons) and de-inlining the less-than comparison generator call in the less-than-or-equal generator, the QEMU's output binary is 78 bytes smaller (measurement taken when building on a CI-like environment).

Testing

Besides the usual manual tests run on QEMU's VIRT_RV32 board, CI's QEMU tests for RV32 were executed successfully by GitHub's test runner from its original code branch.

This commit simplifies the emitter code in charge of generating opcodes
performing less-than and less-than-or-equal comparisons.

By rewriting the SLT/SLTU opcode generator (handling less-than
comparisons) and de-inlining the less-than comparison generator call in
the less-than-or-equal generator, the output binary is ~80 bytes smaller
(measurements taken from the QEMU port).

Signed-off-by: Alessandro Gatti <a.gatti@frob.it>
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codecov bot commented Jul 9, 2025

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.44%. Comparing base (df05cae) to head (ec90a34).

Additional details and impacted files
@@           Coverage Diff           @@
##           master   #17652   +/-   ##
=======================================
  Coverage   98.44%   98.44%           
=======================================
  Files         171      171           
  Lines       22192    22192           
=======================================
  Hits        21847    21847           
  Misses        345      345           

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github-actions bot commented Jul 9, 2025

Code size report:

   bare-arm:    +0 +0.000% 
minimal x86:    +0 +0.000% 
   unix x64:    +0 +0.000% standard
      stm32:    +0 +0.000% PYBV10
     mimxrt:    +0 +0.000% TEENSY40
        rp2:    +0 +0.000% RPI_PICO_W
       samd:    +0 +0.000% ADAFRUIT_ITSYBITSY_M4_EXPRESS
  qemu rv32:  -102 -0.023% VIRT_RV32

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