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The Make and Meson builds add the x86_64 Huffman decoder assembly source to every build, whatever the target CPU. Match the CMake build and only build it when targeting x86_64, otherwise explicitly disable assembly. For Make, ask the compiler whether it targets x86_64, rather than using uname, so cross-compiling and -m32 builds are handled. For Meson, check the host machine's CPU family.
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What and why
The Make and Meson builds add the x86_64 Huffman decoder assembly
source to every build, whatever the target CPU. Match the CMake build
and only build it when targeting x86_64, otherwise explicitly disable
assembly.
For Make, ask the compiler whether it targets x86_64, rather than
using uname, so cross-compiling and -m32 builds are handled. For
Meson, check the host machine's CPU family.
Checklist
A gain in one configuration is not a general gain: see the Performance section of CONTRIBUTING.md.
Tools used
AI usage: I took a look at the 3 build systems to assess the situation. Claude Opus figured out
the Meson and GNU Make bits for the architecture checks.