[llvm-bugs] [Bug 45434] New: Thin LTO ignores -fno-vectorize and -fno-slp-vectorize

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=45434

            Bug ID: 45434
           Summary: Thin LTO ignores -fno-vectorize and -fno-slp-vectorize
           Product: lld
           Version: unspecified
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: All Bugs
          Assignee: unassignedbugs at nondot.org
          Reporter: dave at znu.io
                CC: llvm-bugs at lists.llvm.org, smithp352 at googlemail.com

Currently, there is no way to disable loop or SLP vectorization when using LTO.
This is unfortunate when targeting AVX2 or AVX512 machines where poor cost
modeling by the auto-vectorizers becomes painfully obvious.

The normal workaround doesn't work either, namely:
`-Wl,-plugin-opt,-vectorize-loops=false and
-Wl,-plugin-opt,-vectorize-slp=false`. Teresa Johnson confirmed via private
email that this is the case.

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