From: Dave Thaler <dthaler@xxxxxxxxxxxxx> Signed-off-by: Dave Thaler <dthaler@xxxxxxxxxxxxx> --- Documentation/bpf/clang-notes.rst | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/Documentation/bpf/clang-notes.rst b/Documentation/bpf/clang-notes.rst index b15179cb5..528feddf2 100644 --- a/Documentation/bpf/clang-notes.rst +++ b/Documentation/bpf/clang-notes.rst @@ -14,6 +14,12 @@ Clang defined "CPU" versions, where a CPU version of 3 corresponds to the curren Clang can select the eBPF ISA version using ``-mcpu=v3`` for example to select version 3. +Arithmetic instructions +======================= + +For CPU versions prior to 3, Clang v7.0 and later can enable ``BPF_ALU`` support with +``-Xclang -target-feature -Xclang +alu32``. In CPU version 3, support is automatically included. + Atomic operations ================= -- 2.33.4
