Author: Armin Rigo <ar...@tunes.org>
Branch: 
Changeset: r78429:318e8acc19df
Date: 2015-07-04 19:39 +0200
http://bitbucket.org/pypy/pypy/changeset/318e8acc19df/

Log:    add comment

diff --git a/rpython/jit/backend/x86/assembler.py 
b/rpython/jit/backend/x86/assembler.py
--- a/rpython/jit/backend/x86/assembler.py
+++ b/rpython/jit/backend/x86/assembler.py
@@ -1333,7 +1333,7 @@
         loc1, = arglocs
         assert isinstance(resloc, RegLoc)
         assert isinstance(loc1, RegLoc)
-        self.mc.MOVD32_xr(resloc.value, loc1.value)
+        self.mc.MOVD32_xr(resloc.value, loc1.value)   # zero-extending
 
     def genop_llong_eq(self, op, arglocs, resloc):
         loc1, loc2, locxtmp = arglocs
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