[llvm-bugs] [Bug 33307] New: [X86] 32-byte alignment of small loops

via llvm-bugs llvm-bugs at lists.llvm.org
Sun Jun 4 21:25:22 PDT 2017


            Bug ID: 33307
           Summary: [X86] 32-byte alignment of small loops
           Product: new-bugs
           Version: unspecified
          Hardware: PC
                OS: Windows NT
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: new bugs
          Assignee: unassignedbugs at nondot.org
          Reporter: serguei.katkov at azul.com
                CC: llvm-bugs at lists.llvm.org

X86 optimization guide directly states that 32-byte alignment of small loops
may benefit from LSD(Loop Stream Detector) if some condition are met.

It seems that X86 LLVM backend does nothing related to this.
It would be nice to implement this optimization to speed-up execution of small

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