peilin-ye wrote:
Changes in v7:
1. Change encoding to make it easier to support `SEQ_CST` in the future
(Yingchi)
```
(before) | imm{7-4} | imm{3-0} |
------------- | ------------------- | -------- |
load-acquire | BPF_LOAD_ACQ (0x1) | 0x0 |
store-release | BPF_STORE_REL (0x2) | 0x0 |
```
```
(after) | imm{7-4} | imm{3-0} |
------------- | --------------- | ----------------- |
load-acquire | BPF_LOAD (0x1) | BPF_ACQUIRE (0x1) |
store-release | BPF_STORE (0x2) | BPF_RELEASE (0x2) |
```
Introduce the following new flags for memory orders:
```
def BPF_RELAXED : BPFAtomicOrdering<0x0>;
def BPF_ACQUIRE : BPFAtomicOrdering<0x1>;
def BPF_RELEASE : BPFAtomicOrdering<0x2>;
def BPF_ACQ_REL : BPFAtomicOrdering<0x3>;
def BPF_SEQ_CST : BPFAtomicOrdering<0x4>;
```
Include all orders defined by the C++ standard except `CONSUME` (Yonghong)
2. `BPFISelLowering.cpp` changes (Matt)
- Avoid unnecessarily setting `MVT::i{8,16}` `ATOMIC_{LOAD,STORE}` to
`Custom`
- Coding style change
3. `acquire-release.ll` changes (Yingchi)
- Move `; CHECK` labels into their corresponding function bodies
- Delete the `; Source:` section
4. Update `bpf-predefined-macros.c`
https://github.com/llvm/llvm-project/pull/108636
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