[pypy-commit] pypy default: Add a test for cast_float_to_singlefloat. Fails so far because

[arigo]

Author: Armin Rigo <arigo at tunes.org>
Branch: 
Changeset: r71085:9761ff01220d
Date: 2014-04-30 14:38 +0200
http://bitbucket.org/pypy/pypy/changeset/9761ff01220d/

Log:	Add a test for cast_float_to_singlefloat. Fails so far because the
	x86 backend doesn't correctly zero out the upper 4 bytes.

diff --git a/rpython/jit/backend/test/runner_test.py b/rpython/jit/backend/test/runner_test.py
--- a/rpython/jit/backend/test/runner_test.py
+++ b/rpython/jit/backend/test/runner_test.py
@@ -4347,3 +4347,10 @@
                                'void')
         assert foo[0] == 1789201
         lltype.free(foo, flavor='raw')
+
+    def test_cast_float_to_singlefloat(self):
+        if not self.cpu.supports_singlefloats:
+            py.test.skip("requires singlefloats")
+        res = self.execute_operation(rop.CAST_FLOAT_TO_SINGLEFLOAT,
+                                   [BoxFloat(12.5)], 'int')
+        assert res.getint() == struct.unpack("I", struct.pack("f", 12.5))[0]