Really fix 'potential unsafe sign check of a bitwise operation' code defect

(fix of commit af00c4d)

* mark.c [!OS2] (GC_mark_from): Replace (signed_word)v>=0 to (v&SIGNB)==0
(anyway, the compiler generates the same code).

diff --git a/mark.c b/mark.c
index 1159e3d0f8caefb4e2a3df85ccf2b4c3124d9f2e..b1d59026c203cd9654fd8de8c9f32865d6ac3a50 100644 (file)
--- a/mark.c
+++ b/mark.c
@@ -650,8 +650,8 @@ GC_INNER mse * GC_mark_from(mse *mark_stack_top, mse *mark_stack,
 # ifdef OS2 /* Use untweaked version to circumvent compiler problem */
     while ((word)mark_stack_top >= (word)mark_stack && credit >= 0)
 # else
-    while ((signed_word)(((word)mark_stack_top - (word)mark_stack)
-                         | (word)credit) >= 0)
+    while (((((word)mark_stack_top - (word)mark_stack) | (word)credit)
+            & SIGNB) == 0)
 # endif
   {
     current_p = mark_stack_top -> mse_start;