https://bugs.llvm.org/show_bug.cgi?id=33955
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: [email protected]
Reporter: [email protected]
CC: [email protected]
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
complexity.
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