compiler: defer to middle-end for complex division

Go used to use slightly different semantics than C99 for complex division,
so we used runtime routines to handle the different.  The gc compiler
has changes its behavior to match C99, so changes ours as well.

For golang/go#14644

Reviewed-on: https://go-review.googlesource.com/c/gofrontend/+/274213

1 files changed, 0 insertions, 21 deletions

diff --git a/gcc/go/gofrontend/expressions.cc b/gcc/go/gofrontend/expressions.cc
index 23caf61..50574c2 100644
--- a/gcc/go/gofrontend/expressions.cc
+++ b/gcc/go/gofrontend/expressions.cc
@@ -6979,27 +6979,6 @@ Binary_expression::do_get_backend(Translate_context* context)
   // been converted to a String_concat_expression in do_lower.
   go_assert(!left_type->is_string_type());
 
-  // For complex division Go might want slightly different results than the
-  // backend implementation provides, so we have our own runtime routine.
-  if (this->op_ == OPERATOR_DIV && this->left_->type()->complex_type() != NULL)
-    {
-      Runtime::Function complex_code;
-      switch (this->left_->type()->complex_type()->bits())
-	{
-	case 64:
-          complex_code = Runtime::COMPLEX64_DIV;
-	  break;
-	case 128:
-          complex_code = Runtime::COMPLEX128_DIV;
-	  break;
-	default:
-	  go_unreachable();
-	}
-      Expression* complex_div =
-          Runtime::make_call(complex_code, loc, 2, this->left_, this->right_);
-      return complex_div->get_backend(context);
-    }
-
   Bexpression* left = this->left_->get_backend(context);
   Bexpression* right = this->right_->get_backend(context);