--- a/Cython/Compiler/ExprNodes.py	Thu Sep 25 23:33:31 2008 +0200
+++ b/Cython/Compiler/ExprNodes.py	Sat Sep 27 13:52:44 2008 -0700
@@ -3414,21 +3414,26 @@ class FloorDivNode(NumBinopNode):
             self.operand2.result())
 
 
-class ModNode(IntBinopNode):
+class ModNode(NumBinopNode):
     #  '%' operator.
     
     def is_py_operation(self):
         return (self.operand1.type.is_string
             or self.operand2.type.is_string
-            or IntBinopNode.is_py_operation(self))
-
+            or NumBinopNode.is_py_operation(self))
+
+    def calculate_result_code(self):
+        if self.operand1.type.is_float or self.operand2.type.is_float:
+            return "fmod(%s, %s)" % (
+                self.operand1.result(), 
+                self.operand2.result())
+        else:
+            return "(%s %% %s)" % (
+                self.operand1.result(), 
+                self.operand2.result())
 
 class PowNode(NumBinopNode):
     #  '**' operator.
-
-    def analyse_types(self, env):
-        env.pow_function_used = 1
-        NumBinopNode.analyse_types(self, env)
 
     def compute_c_result_type(self, type1, type2):
         if self.c_types_okay(type1, type2):

--- a/Cython/Compiler/Symtab.py	Thu Sep 25 23:33:31 2008 +0200
+++ b/Cython/Compiler/Symtab.py	Sat Sep 27 13:52:44 2008 -0700
@@ -167,7 +167,6 @@ class Scope:
     # temp_counter      integer            Counter for naming temp vars
     # cname_to_entry    {string : Entry}   Temp cname to entry mapping
     # int_to_entry      {int : Entry}      Temp cname to entry mapping
-    # pow_function_used boolean            The C pow() function is used
     # return_type       PyrexType or None  Return type of function owning scope
     # is_py_class_scope boolean            Is a Python class scope
     # is_c_class_scope  boolean            Is an extension type scope
@@ -221,7 +220,6 @@ class Scope:
         #self.pending_temp_entries = [] # TEMPORARY
         self.temp_counter = 1
         self.cname_to_entry = {}
-        self.pow_function_used = 0
         self.string_to_entry = {}
         self.identifier_to_entry = {}
         self.num_to_entry = {}
@@ -637,8 +635,6 @@ class Scope:
 
     def generate_library_function_declarations(self, code):
         # Generate extern decls for C library funcs used.
-        #if self.pow_function_used:
-        #	code.putln("%s double pow(double, double);" % Naming.extern_c_macro)
         pass
         
     def defines_any(self, names):

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/tests/run/fmod.pyx	Sat Sep 27 13:52:44 2008 -0700
@@ -0,0 +1,7 @@
+__doc__ = """
+    >>> fmod(7, 1.25)
+    0.75
+"""
+
+def fmod(double a, double b):
+    return a % b

--- a/tests/errors/e_modop.pyx	Thu Sep 25 23:33:31 2008 +0200
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -1,6 +0,0 @@
-def f():
-	cdef float flt1, flt2, flt3
-	flt1 = flt2 % flt3 # error
-_ERRORS = u"""
-/Local/Projects/D/Pyrex/Source/Tests/Errors2/e_modop.pyx:3:13: Invalid operand types for '%' (float; float)
-"""