Workaround for more Int128-and-float methods on Windows with LLVM 14+

src/crystal/compiler_rt.cr

@@ -24,6 +24,7 @@ require "./compiler_rt/divmod128.cr"
   # those functions directly
   # note that the following defs redefine the ones in `primitives.cr`
 
+  # https://github.com/llvm/llvm-project/commit/4a406d32e97b1748c4eed6674a2c1819b9cf98ea
   struct Int128
     {% for int2 in [Int8, Int16, Int32, Int64, Int128, UInt8, UInt16, UInt32, UInt64, UInt128] %}
       @[AlwaysInline]
@@ -83,4 +84,82 @@ require "./compiler_rt/divmod128.cr"
       end
     {% end %}
   {% end %}
+
+  # https://github.com/llvm/llvm-project/commit/d6216e2cd1a5e07f8509215ee5422ff5ee358da8
+  {% if compare_versions(Crystal::LLVM_VERSION, "14.0.0") >= 0 %}
+    {% for v in [
+                  {Int128, "to_f32", Float32, "__floattisf"},
+                  {Int128, "to_f64", Float64, "__floattidf"},
+                  {UInt128, "to_f32", Float32, "__floatuntisf"},
+                  {UInt128, "to_f64", Float64, "__floatuntidf"},
+                  {Float32, "to_i128", Int128, "__fixsfti"},
+                  {Float32, "to_u128", UInt128, "__fixunssfti"},
+                  {Float64, "to_i128", Int128, "__fixdfti"},
+                  {Float64, "to_u128", UInt128, "__fixunsdfti"},
+                ] %}
+      {% type, method, ret, rt_method = v %}
+      struct {{ type.id }}
+        @[AlwaysInline]
+        def {{ method.id }} : {{ ret.id }}
+          raise OverflowError.new unless {{ ret.id }}::MIN <= self <= {{ ret.id }}::MAX
+          {{ ret.id }}.new!({{ rt_method.id }}(self))
+        end
+
+        @[AlwaysInline]
+        def {{ method.id }}! : {{ ret.id }}
+          {{ ret.id }}.new!({{ rt_method.id }}(self))
+        end
+      end
+    {% end %}
+
+    {% for op in {"+", "-", "*", "fdiv"} %}
+      struct Int128
+        @[AlwaysInline]
+        def {{ op.id }}(other : Float32) : Float32
+          to_f32 {{ op.id }} other
+        end
+
+        @[AlwaysInline]
+        def {{ op.id }}(other : Float64) : Float64
+          to_f64 {{ op.id }} other
+        end
+      end
+
+      struct UInt128
+        @[AlwaysInline]
+        def {{ op.id }}(other : Float32) : Float32
+          to_f32 {{ op.id }} other
+        end
+
+        @[AlwaysInline]
+        def {{ op.id }}(other : Float64) : Float64
+          to_f64 {{ op.id }} other
+        end
+      end
+
+      struct Float32
+        @[AlwaysInline]
+        def {{ op.id }}(other : Int128) : Float32
+          self.{{ op.id }}(other.to_f32)
+        end
+
+        @[AlwaysInline]
+        def {{ op.id }}(other : UInt128) : Float32
+          self.{{ op.id }}(other.to_f32)
+        end
+      end
+
+      struct Float64
+        @[AlwaysInline]
+        def {{ op.id }}(other : Int128) : Float64
+          self.{{ op.id }}(other.to_f64)
+        end
+
+        @[AlwaysInline]
+        def {{ op.id }}(other : UInt128) : Float64
+          self.{{ op.id }}(other.to_f64)
+        end
+      end
+    {% end %}
+  {% end %}
 {% end %}