[llvm-bugs] [Bug 46228] New: [LV] Loop vectorizer crashes trying to version for unit stride at -Os/-Oz

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=46228

            Bug ID: 46228
           Summary: [LV] Loop vectorizer crashes trying to version for
                    unit stride at -Os/-Oz
           Product: libraries
           Version: trunk
          Hardware: All
                OS: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: Loop Optimizer
          Assignee: unassignedbugs at nondot.org
          Reporter: ayal.zaks at intel.com
                CC: llvm-bugs at lists.llvm.org

Created attachment 23585
  --> https://bugs.llvm.org/attachment.cgi?id=23585&action=edit
Attached ll raises an assert compiled with "opt -loop-vectorize -S"

Loop access analysis may generate runtime checks to version a loop for unit
strides, under -Os/-Oz, when loop vectorization is enabled. This later raises
the loop vectorizer's assert: "Cannot SCEV check stride or overflow when
optimizing for size".

Reproduced by compiling the attached with "opt -loop-vectorize -S".

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