[llvm-branch-commits] [flang] [flang] Implement `tanpi` (PR #149527)

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@@ -8157,6 +8158,21 @@ mlir::Value IntrinsicLibrary::genTand(mlir::Type resultType,
   return getRuntimeCallGenerator("tan", ftype)(builder, loc, {arg});
 }
 
+// TANPI
+mlir::Value IntrinsicLibrary::genTanpi(mlir::Type resultType,
+                                       llvm::ArrayRef<mlir::Value> args) {
+  assert(args.size() == 1);
+  mlir::MLIRContext *context = builder.getContext();
+  mlir::FunctionType ftype =
+      mlir::FunctionType::get(context, {resultType}, {args[0].getType()});
+  llvm::APFloat pi = llvm::APFloat(llvm::numbers::pi);
+  mlir::Value dfactor =
+      builder.createRealConstant(loc, mlir::Float64Type::get(context), pi);
+  mlir::Value factor = builder.createConvert(loc, args[0].getType(), dfactor);
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c8ef wrote:

Based on our discussion in #149525, I believe this patch is ready to go, too?

My current plan is to first implement the missing trigonometric pi functions, and then address the constant pi problem. I'll open an issue to track this.

https://github.com/llvm/llvm-project/pull/149527