[llvm-bugs] [Bug 30200] New: Infinitely decreased stack pointer

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https://llvm.org/bugs/show_bug.cgi?id=30200

            Bug ID: 30200
           Summary: Infinitely decreased stack pointer
           Product: libraries
           Version: 3.8
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: Backend: X86
          Assignee: unassignedbugs at nondot.org
          Reporter: llvm at henning-thielemann.de
                CC: llvm-bugs at lists.llvm.org
    Classification: Unclassified

Created attachment 17185
  --> https://llvm.org/bugs/attachment.cgi?id=17185&action=edit
LL file for loop with ever decreasing stack pointer

I attach a small example of code that I generated programmatically via MCJIT
and optimized with -O1 to simplify it. It is a loop containing some alloca (but
problem remains with malloc/free). When run it crashes if the loop count is big
enough. The generated X86 assembly code looks like the stack pointer is
decremented repeatedly by these instructions:

        movq    %rsp, %rax
        leaq    -32(%rax), %rsp

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