Bug 652571 - xptstubs on unix x86_64 does not pass float correctly. r=espindola

xpcom/reflect/xptcall/src/md/unix/xptcstubs_x86_64_darwin.cpp

@@ -114,7 +114,7 @@ PrepareAndDispatch(nsXPTCStubBase * self, PRUint32 methodIndex,
                 // The value in %xmm register is already prepared to
                 // be retrieved as a float. Therefore, we pass the
                 // value verbatim, as a double without conversion.
-                dp->val.d = *(double*) ap++;
+                dp->val.d = fpregs[nr_fpr++];
             else
                 dp->val.f = *(float*) ap++;
             continue;

xpcom/reflect/xptcall/src/md/unix/xptcstubs_x86_64_linux.cpp

@@ -114,7 +114,7 @@ PrepareAndDispatch(nsXPTCStubBase * self, PRUint32 methodIndex,
                 // The value in %xmm register is already prepared to
                 // be retrieved as a float. Therefore, we pass the
                 // value verbatim, as a double without conversion.
-                dp->val.d = *(double*) ap++;
+                dp->val.d = fpregs[nr_fpr++];
             else
                 dp->val.f = *(float*) ap++;
             continue;

xpcom/reflect/xptcall/src/md/unix/xptcstubs_x86_64_solaris.cpp

@@ -114,7 +114,7 @@ PrepareAndDispatch(nsXPTCStubBase * self, PRUint32 methodIndex,
                 // The value in %xmm register is already prepared to
                 // be retrieved as a float. Therefore, we pass the
                 // value verbatim, as a double without conversion.
-                dp->val.d = *(double*) ap++;
+                dp->val.d = fpregs[nr_fpr++];
             else
                 dp->val.f = *(float*) ap++;
             continue;