[CIR][NFC] Add example for get_bitfield with volatile qualifier

[Andres-Salamanca]

The example demonstrates how get_bitfield is emitted when accessing a bitfield declared as volatile.

[llvmbot]

@llvm/pr-subscribers-clangir

Author: None (Andres-Salamanca)

Changes

The example demonstrates how get_bitfield is emitted when accessing a bitfield declared as volatile.

---

Full diff: https://github.com/llvm/llvm-project/pull/147828.diff

1 Files Affected:

• (modified) clang/include/clang/CIR/Dialect/IR/CIROps.td (+3)

diff --git a/clang/include/clang/CIR/Dialect/IR/CIROps.td b/clang/include/clang/CIR/Dialect/IR/CIROps.td
index 6529f1386599c..8041630112ab5 100644
--- a/clang/include/clang/CIR/Dialect/IR/CIROps.td
+++ b/clang/include/clang/CIR/Dialect/IR/CIROps.td
@@ -1685,6 +1685,9 @@ def GetBitfieldOp : CIR_Op<"get_bitfield"> {
 
     A unit attribute `volatile` can be used to indicate a volatile load of the
     bitfield.
+    ```mlir
+      cir.get_bitfield(#bfi, %0 {is_volatile} : !cir.ptr<!u64i>) -> !s32i
+    ```
 
     Example:
     Suppose we have a struct with multiple bitfields stored in

[llvmbot]

@llvm/pr-subscribers-clang

Author: None (Andres-Salamanca)

Changes

The example demonstrates how get_bitfield is emitted when accessing a bitfield declared as volatile.

---

Full diff: https://github.com/llvm/llvm-project/pull/147828.diff

1 Files Affected:

• (modified) clang/include/clang/CIR/Dialect/IR/CIROps.td (+3)

diff --git a/clang/include/clang/CIR/Dialect/IR/CIROps.td b/clang/include/clang/CIR/Dialect/IR/CIROps.td
index 6529f1386599c..8041630112ab5 100644
--- a/clang/include/clang/CIR/Dialect/IR/CIROps.td
+++ b/clang/include/clang/CIR/Dialect/IR/CIROps.td
@@ -1685,6 +1685,9 @@ def GetBitfieldOp : CIR_Op<"get_bitfield"> {
 
     A unit attribute `volatile` can be used to indicate a volatile load of the
     bitfield.
+    ```mlir
+      cir.get_bitfield(#bfi, %0 {is_volatile} : !cir.ptr<!u64i>) -> !s32i
+    ```
 
     Example:
     Suppose we have a struct with multiple bitfields stored in

[erichkeane]

Can we add a test as well?

[andykaylor]

lgtm

[llvm-ci]

LLVM Buildbot has detected a new failure on builder llvm-clang-aarch64-darwin running on doug-worker-4 while building clang at step 2 "checkout".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/190/builds/23254

Here is the relevant piece of the build log for the reference

Step 2 (checkout) failure: update (failure)
git version 2.39.3 (Apple Git-146)
error: cannot open '.git/FETCH_HEAD': No space left on device
error: cannot open '.git/FETCH_HEAD': No space left on device