[llvm-bugs] [Bug 33955] New: BPF target: smarter stack allocations

via llvm-bugs llvm-bugs at lists.llvm.org
Wed Jul 26 15:27:58 PDT 2017


            Bug ID: 33955
           Summary: BPF target: smarter stack allocations
           Product: new-bugs
           Version: unspecified
          Hardware: PC
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: new bugs
          Assignee: unassignedbugs at nondot.org
          Reporter: daniel at iogearbox.net
                CC: llvm-bugs at lists.llvm.org

Now that kernel has ability to reduce stack usage in JITs and interpreter
depending on the stack needs of the BPF program, LLVM should also optimize for
smallest stack usage, also from the angle of the verifier that compares stacks
in state pruning. Given verfier only checks spilled regs, we should optimize
allocation wrt misc data that pruning can match and thus reduce verifier

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