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Unverified Commit 31d219d2 authored by Roman Lebedev's avatar Roman Lebedev
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[InstCombine] Fold `((X - Y) - Z)` to `X - (Y + Z)` (PR49858) 

https://alive2.llvm.org/ce/z/67w-wQ

We prefer `add`s over `sub`, and this particular xform
allows further folds to happen:

Fixes https://bugs.llvm.org/show_bug.cgi?id=49858
parent 5ab489d9
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