[LLVMbugs] [Bug 20676] New: [AVX512] unnecessary register spill and immediate refill before function call

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=20676

            Bug ID: 20676
           Summary: [AVX512] unnecessary register spill and immediate
                    refill before function call
           Product: new-bugs
           Version: unspecified
          Hardware: PC
                OS: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: new bugs
          Assignee: unassignedbugs at nondot.org
          Reporter: matt at pharr.org
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified

Created attachment 12904
  --> http://llvm.org/bugs/attachment.cgi?id=12904&action=edit
test case

With top of tree and the attached test case, running "llc -mcpu=knl
-filetype=asm bug.ll -o -" has the following in the generated code. The reload
at least is unnecessary, I believe...

    vmovups    %zmm0, 128(%rsp)        ## 64-byte Spill
    vmovups    128(%rsp), %zmm0        ## 64-byte Reload

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