[Mlir-commits] [mlir] [MLIR][Math][GPU] Add lowering of absi and fpowi to libdevice (PR #123422)

[Oleksandr Alex Zinenko]

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@@ -132,23 +159,84 @@ struct OpToFuncCallLowering : public ConvertOpToLLVMPattern<SourceOp> {
     return "";
   }
 
-  LLVM::LLVMFuncOp appendOrGetFuncOp(StringRef funcName, Type funcType,
-                                     Operation *op) const {
-    using LLVM::LLVMFuncOp;
+  const std::string f32Func;
+  const std::string f64Func;
+  const std::string f32ApproxFunc;
+  const std::string f16Func;
+};
 
-    auto funcAttr = StringAttr::get(op->getContext(), funcName);
-    Operation *funcOp = SymbolTable::lookupNearestSymbolFrom(op, funcAttr);
-    if (funcOp)
-      return cast<LLVMFuncOp>(*funcOp);
+/// Rewriting that replace SourceOp with a CallOp to `i32Func`
+/// The function declaration is added in case it was not added before.
+/// This assumes that all types integral.
+///
+/// Example with NVVM:
+///   %abs_i32 = math.iabs %arg_i32 : i32
+///
+/// will be transformed into
+///   llvm.call @__nv_abs(%arg_i32) : (i32) -> i32
+///
+template <typename SourceOp>
+struct IntOpToFuncCallLowering
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ftynse wrote:

Can this just be folded into the the `OpToFuncCallLowering` as another option with an empty-by-default function name?

https://github.com/llvm/llvm-project/pull/123422