Add C-API for constructing Complex Attributes (#208)

* Add C-API to construct ComplexF32 and ComplexF64 attributes

* Link against MLIR Complex dialect

* Rename C functions and delete `float` version

* Add the Julia bindings to the C routines

* Apply suggestions from code review

Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>

---------

Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>

Author: mofeing

deps/ReactantExtra/API.cpp

@@ -15,6 +15,7 @@
 #include "mlir/Dialect/Affine/IR/AffineOps.h"
 #include "mlir/Dialect/Arith/IR/Arith.h"
 #include "mlir/Dialect/Async/IR/Async.h"
+#include "mlir/Dialect/Complex/IR/Complex.h"
 #include "mlir/Dialect/ControlFlow/IR/ControlFlow.h"
 #include "mlir/Dialect/DLTI/DLTI.h"
 #include "mlir/Dialect/Func/Extensions/InlinerExtension.h"
@@ -63,6 +64,19 @@ using namespace mlir;
 using namespace llvm;
 using namespace xla;
 
+// MLIR C-API extras
+#pragma region MLIR Extra
+MLIR_CAPI_EXPORTED MlirAttribute mlirComplexAttrDoubleGet(MlirContext ctx, MlirType type, double real, double imag) {
+    return wrap(complex::NumberAttr::get(unwrap(type), real, imag));
+}
+
+MLIR_CAPI_EXPORTED MlirAttribute mlirComplexAttrDoubleGetChecked(MlirLocation loc, MlirType type, double real, double imag) {
+    return wrap(complex::NumberAttr::getChecked(unwrap(loc), unwrap(type), unwrap(type), real, imag));
+}
+
+MlirTypeID mlirComplexAttrGetTypeID(void) { return wrap(complex::NumberAttr::getTypeID()); }
+#pragma endregion
+
 // int google::protobuf::io::CodedInputStream::default_recursion_limit_ = 100;
 // int xla::_LayoutProto_default_instance_;
 

deps/ReactantExtra/BUILD

@@ -308,6 +308,7 @@ cc_library(
         "@llvm-project//mlir:AllPassesAndDialects",
         "@llvm-project//mlir:ArithDialect",
         "@llvm-project//mlir:AsyncDialect",
+        "@llvm-project//mlir:ComplexDialect",
         "@llvm-project//mlir:ControlFlowDialect",
         "@llvm-project//mlir:ConversionPasses",
         "@llvm-project//mlir:DLTIDialect",

src/mlir/IR/Attribute.jl

@@ -133,6 +133,29 @@ function Base.Float64(attr::Attribute)
     return API.mlirFloatAttrGetValueDouble(attr)
 end
 
+"""
+    Attribute(complex; context=context(), location=Location(), check=false)
+
+Creates a complex attribute in the given context with the given complex value and double-precision FP semantics.
+"""
+function Attribute(
+    c::T; context::Context=context(), location::Location=Location(), check::Bool=false
+) where {T<:Complex}
+    if check
+        Attribute(
+            API.mlirComplexAttrDoubleGetChecked(
+                location, Type(T), Float64(real(c)), Float64(imag(c))
+            ),
+        )
+    else
+        Attribute(
+            API.mlirComplexAttrDoubleGet(
+                context, Type(T), Float64(real(c)), Float64(imag(c))
+            ),
+        )
+    end
+end
+
 """
     isinteger(attr)
 

src/mlir/MLIR.jl

@@ -11,6 +11,19 @@ module API
     let
         include("libMLIR_h.jl")
     end
+
+    # MLIR C API - extra
+    function mlirComplexAttrDoubleGet(ctx, type, real, imag)
+        @ccall mlir_c.mlirComplexAttrDoubleGet(
+            ctx::MlirContext, type::MlirType, real::Cdouble, imag::Cdouble
+        )::MlirAttribute
+    end
+
+    function mlirComplexAttrDoubleGetChecked(loc, type, real, imag)
+        @ccall mlir_c.mlirComplexAttrDoubleGetChecked(
+            loc::MlirLocation, type::MlirType, real::Cdouble, imag::Cdouble
+        )::MlirAttribute
+    end
 end # module API
 
 include("IR/IR.jl")