compiler: Get rid of slops in structs #91458
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brandtbucher
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Apr 11, 2022
Regain space lost due to alignment by reordering structs from larger to
smaller members and not intertwining bitfields with full-size fields.
With this change, the sizes are now:
Struct Size before Size after
assembler 104 96
basicblock_ 64 56
(Sizes measured on x86-64 Linux, using pahole[1] and this handy
script[2] that compares struct sizes between versions.)
No functional changes expected. Structs are used only internally.
[1] https://github.com/acmel/dwarves
[2] https://gist.github.com/mdboom/6052da76e152ccc9dc6b9741a7ddd6c6
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@brandtbucher: Please replace |
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Regain space lost due to alignment by reordering structs from larger to smaller members and not intertwining bitfields with full-size fields.
With this change, the sizes are now:
Sizes measured on x86-64 Linux, using pahole and this handy script that compares struct sizes between versions.
I don't think this warrants an issue, as it just rearranges members inside the
compile.ctranslation unit.