workaround for gcc 3.3 bug or overoptimisation if a label is not used

git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@368 c046a42c-6fe2-441c-8c8c-71466251a162

diff --git a/exec.h b/exec.h
index 29779f9..026daaa 100644 (file)
--- a/exec.h
+++ b/exec.h
@@ -225,11 +225,14 @@ TranslationBlock *tb_find_pc(unsigned long pc_ptr);
 #if defined(__powerpc__)
 
 /* on PowerPC we patch the jump instruction directly */
-#define JUMP_TB(tbparam, n, eip)\
+#define JUMP_TB(opname, tbparam, n, eip)\
 do {\
-    static void __attribute__((unused)) *__op_label ## n = &&label ## n;\
-    asm volatile ("b %0" : : "i" (&__op_jmp ## n));\
-label ## n:\
+    asm volatile (".section \".data\"\n"\
+                 "__op_label" #n "." stringify(opname) ":\n"\
+                 ".long 1f\n"\
+                 ".previous\n"\
+                  "b __op_jmp" #n "\n"\
+                 "1:\n");\
     T0 = (long)(tbparam) + (n);\
     EIP = eip;\
     EXIT_TB();\
@@ -239,7 +242,7 @@ label ## n:\
 
 /* jump to next block operations (more portable code, does not need
    cache flushing, but slower because of indirect jump) */
-#define JUMP_TB(tbparam, n, eip)\
+#define JUMP_TB(opname, tbparam, n, eip)\
 do {\
     static void __attribute__((unused)) *__op_label ## n = &&label ## n;\
     static void __attribute__((unused)) *dummy ## n = &&dummy_label ## n;\