[LLVMbugs] [Bug 20503] New: Crash when compiling multiplication of 129 bit integers

bugzilla-daemon at llvm.org bugzilla-daemon at llvm.org
Thu Jul 31 07:54:20 PDT 2014


            Bug ID: 20503
           Summary: Crash when compiling multiplication of 129 bit
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: Backend: X86
          Assignee: unassignedbugs at nondot.org
          Reporter: jaak.randmets at cyber.ee
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified

Created attachment 12842
  --> http://llvm.org/bugs/attachment.cgi?id=12842&action=edit
Test case

The simplest occurrence that I was able to produce is attached, but this can
also be produced by having a function that takes two 64 bit integers, converts
them to i129, multiplies them as i129 and then returns i64 truncated result.

The crash also occurs with larger integers, but everything seems to work well
for integers with less bits than 129.

How to reproduce: llc i129-crash.ll

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