gh-104909: Make LOAD_ATTR_PROPERTY a viable uop#110560
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gvanrossumforce-pushed the load-attr-uops branch from 8dcbe3a to fff4211Comparegvanrossumforce-pushed the load-attr-uops branch 2 times, most recently from 2deceef to 067b489Comparegvanrossumforce-pushed the load-attr-uops branch from 067b489 to 99ec298Comparegvanrossum changed the title 
gvanrossumforce-pushed the load-attr-uops branch from 99ec298 to 0b71d63Compare
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gvanrossum commented Nov 18, 2023
Alas, this will go nowhere. (See issue.) |
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There are severe problems here.
LOAD_ATTR_PROPERTYtakes afunc_versioncache entry an anfgetcache entry, which need to be cross-checked (fget->func_version == func_version) but a single uop cannot reference two cache entries.The immediate fix (after rearranging the cache entries) is to load
fgetonto the stack. However, this isn't safe, because it will break whenDEOPT_IF()jumps back to the unspecialized opcode (since the stack is different).Moreover, I needed to disable two assertions from the code generator. It's possible there's a better way, but I'd have to think, and it's not worth it unless we solve the other problem.
This draft PR just exists to find out what else CI finds.