[Python-checkins] python/dist/src/Lib/test test_peepholer.py, 1.11, 1.12

[rhettinger at users.sourceforge.net]

Update of /cvsroot/python/python/dist/src/Lib/test
In directory sc8-pr-cvs1.sourceforge.net:/tmp/cvs-serv3491

Modified Files:
	test_peepholer.py 
Log Message:
Teach the peepholer to fold unary operations on constants.

Afterwards, -0.5 loads in a single step and no longer requires a runtime 
UNARY_NEGATIVE operation.



Index: test_peepholer.py
===================================================================
RCS file: /cvsroot/python/python/dist/src/Lib/test/test_peepholer.py,v
retrieving revision 1.11
retrieving revision 1.12
diff -u -d -r1.11 -r1.12
--- test_peepholer.py	10 Feb 2005 20:40:29 -0000	1.11
+++ test_peepholer.py	20 Feb 2005 12:46:54 -0000	1.12
@@ -133,6 +133,25 @@
         asm = dis_single('a="x"*1000')
         self.assert_('(1000)' in asm)
 
+    def test_folding_of_unaryops_on_constants(self):
+        for line, elem in (
+            ('`1`', "('1')"),                       # unary convert
+            ('-0.5', '(-0.5)'),                     # unary negative
+            ('~-2', '(1)'),                         # unary invert
+        ):
+            asm = dis_single(line)
+            self.assert_(elem in asm, asm)
+            self.assert_('UNARY_' not in asm)
+
+        # Verify that unfoldables are skipped
+        for line, elem in (
+            ('-"abc"', "('abc')"),                  # unary negative
+            ('~"abc"', "('abc')"),                  # unary invert
+        ):
+            asm = dis_single(line)
+            self.assert_(elem in asm, asm)
+            self.assert_('UNARY_' in asm)
+
     def test_elim_extra_return(self):
         # RETURN LOAD_CONST None RETURN  -->  RETURN
         def f(x):