Changeset 39966 in vbox for trunk/src/recompiler/target-i386/op_helper.c

Timestamp:

Feb 2, 2012 6:17:20 PM (13 years ago)

Author:

vboxsync

Message:

REM: Don't pollute the FPU state with random garbage (from the stack).

File:

• trunk/src/recompiler/target-i386/op_helper.c (modified) (1 diff)

trunk/src/recompiler/target-i386/op_helper.c

@@ -5947 +5947 @@
 static inline CPU86_LDouble helper_fldt_raw(uint8_t *ptr)
 {
+#ifdef USE_X86LDOUBLE
+    CPU86_LDoubleU tmp;
+    tmp.l.lower = *(uint64_t const *)ptr;
+    tmp.l.upper = *(uint16_t const *)(ptr + 8);
+    return tmp.d;
+#else
+# error "Busted FPU saving/restoring!"
     return *(CPU86_LDouble *)ptr;
+#endif
 }
 
 static inline void helper_fstt_raw(CPU86_LDouble f, uint8_t *ptr)
 {
+#ifdef USE_X86LDOUBLE
+    CPU86_LDoubleU tmp;
+    tmp.d = f;
+    *(uint64_t *)(ptr +  0) = tmp.l.lower;
+    *(uint16_t *)(ptr +  8) = tmp.l.upper;
+    *(uint16_t *)(ptr + 10) = 0;
+    *(uint32_t *)(ptr + 12) = 0;
+#else
+# error "Busted FPU saving/restoring!"
     *(CPU86_LDouble *)ptr = f;
+#endif
 }