[Bug target/87139] 6.4 x86_64 incorrect code generation with -O3 around _addcarry_u64

[cbcode at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87139

cbcode at gmail dot com changed:

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--- Comment #2 from cbcode at gmail dot com ---
Created attachment 44621
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=44621&action=edit
test reproducing the problem