sanwou01 added subscribers: dmgreen, sanwou01. sanwou01 added a comment. Hi, we've got a ~6% regression in SPEC INT 2006 462.libquantum on AArch64 (both -flto and -Ofast) that comes back to this change. See here for a reproducer https://godbolt.org/z/dq98Gqqxn (-fno-vectorize is not strictly necessary, but it does make the difference easier to spot). @dmgreen mentioned to me that we could probably fix this up in the AArch64 backend, but a fix in the mid-end might be more generally useful too.
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