[llvm-bugs] [Bug 31760] New: Assertion failure splitting up <28 x i8> load on ARM.

via llvm-bugs llvm-bugs at lists.llvm.org
Wed Jan 25 12:59:04 PST 2017


https://llvm.org/bugs/show_bug.cgi?id=31760

            Bug ID: 31760
           Summary: Assertion failure splitting up <28 x i8> load on ARM.
           Product: libraries
           Version: 4.0
          Hardware: PC
                OS: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: Common Code Generator Code
          Assignee: unassignedbugs at nondot.org
          Reporter: t.p.northover at gmail.com
                CC: llvm-bugs at lists.llvm.org
    Classification: Unclassified

When loading weird vector types on ARM (and probably others) generic code
mishandles (i.e. asserts) trying to split it up:

$ cat simple.ll
define void @test_silly_load(<28 x i8>* %addr) {
  load volatile <28 x i8>, <28 x i8>* %addr
  ret void
}
$ llc -mtriple=thumbv7 simple.ll -o -

Should be fixed on trunk by r293086, and I think it's a good candidate for 4.0.

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