https://bugs.llvm.org/show_bug.cgi?id=34156
Bug ID: 34156
Summary: BPF target: implement support for emitting BPF_ALU ops
(32 bit variants)
Product: new-bugs
Version: unspecified
Hardware: PC
OS: Linux
Status: NEW
Severity: enhancement
Priority: P
Component: new bugs
Assignee: unassignedb...@nondot.org
Reporter: dan...@iogearbox.net
CC: llvm-bugs@lists.llvm.org
Currently the BPF target only supports emitting BPF_ALU64 alu instructions, but
it doesn't support generating BPF_ALU (32 bit) alu instructions. It would be
really great if this could be implemented so that LLVM can potentially generate
more efficient code (e.g. doesn't need to do shifts to potentially clear upper
bits). The JITs could also emit smaller opcode images by using their 32bit ALU
mappings. There are also 32bit JITs that could translate the BPF insns into
more efficient code when LLVM can choose 32 over 64bit.
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