[pypy-svn] pypy jit-longlong: Fix for gcc, which used to give the warning "dereferencing

[arigo]

Author: Armin Rigo <arigo at tunes.org>
Branch: jit-longlong
Changeset: r41318:8580571213d2
Date: 2011-01-24 19:19 +0100
http://bitbucket.org/pypy/pypy/changeset/8580571213d2/

Log:	Fix for gcc, which used to give the warning "dereferencing type-
	punned pointer will break strict-aliasing rules" and possibly
	produce wrong code.

diff --git a/pypy/rlib/longlong2float.py b/pypy/rlib/longlong2float.py
--- a/pypy/rlib/longlong2float.py
+++ b/pypy/rlib/longlong2float.py
@@ -29,10 +29,12 @@
 from pypy.translator.tool.cbuild import ExternalCompilationInfo
 eci = ExternalCompilationInfo(post_include_bits=["""
 static double pypy__longlong2float(long long x) {
-    return *((double*)&x);
+    char *p = (char*)&x;
+    return *((double*)p);
 }
 static long long pypy__float2longlong(double x) {
-    return *((long long*)&x);
+    char *p = (char*)&x;
+    return *((long long*)p);
 }
 """])