================
@@ -3143,6 +3143,45 @@ def CIR_AssumeOp : CIR_Op<"assume"> {
}];
}
+def CIR_AssumeAlignedOp : CIR_Op<"assume_aligned", [
+ Pure, AllTypesMatch<["pointer", "result"]>
+]> {
+ let summary = "Tell the optimizer that a pointer is aligned";
+ let description = [{
+ The `cir.assume_aligned` operation takes two or three arguments. The first
+ argument `pointer` gives the pointer value whose alignment is to be
assumed,
+ and the second argument `align` is an integer attribute that gives the
+ assumed alignment.
+
+ The `offset` argument is optional. If given, it represents misalignment
+ offset. When it's present, this operation tells the optimizer that the
+ pointer is always misaligned to the alignment by `offset` bytes, a.k.a. the
+ pointer yielded by `(char *)pointer - offset` is aligned to the specified
+ alignment. Note that the `offset` argument is an SSA value rather than an
+ attribute, which means that you could pass a dynamically determined value
+ as the mialignment offset.
+
+ The result of this operation has the same value as the `pointer` argument,
+ but it additionally carries any alignment information indicated by this
+ operation.
+
+ This operation corresponds to the `__builtin_assume_aligned` builtin
+ function.
----------------
bcardosolopes wrote:
Can you please add a small example?
https://github.com/llvm/llvm-project/pull/152152
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