Changeset 2254 in vbox for trunk/src

Timestamp:

Apr 20, 2007 7:43:35 AM (18 years ago)

Author:

vboxsync

Message:

r=frank

File:

• trunk/src/VBox/Runtime/testcase/tstInlineAsm.cpp (modified) (1 diff)

trunk/src/VBox/Runtime/testcase/tstInlineAsm.cpp

@@ -826 +826 @@
 
 #if 0 /* question is whether this should trap or not */
+      /*
+       * r=frank: Of course it must trap:
+       *
+       *   0xfffffff8 * 0x77d7daf8 = 0x77d7daf441412840
+       *
+       * During the following division, the quotient must fit into a 32-bit register.
+       * Therefore the smallest valid divisor is
+       *
+       *  (0x77d7daf441412840 >> 32) + 1 = 0x77d7daf5
+       *
+       * which is definitely greater than  0x3b9aca00.
+       */
     u64 = ASMMultU64ByU32DivByU32(UINT64_C(0xfffffff8c65d6731), UINT32_C(0x77d7daf8), UINT32_C(0x3b9aca00));
     CHECKVAL(u64, UINT64_C(0x02b8f9a2aa74e3dc), "%#018RX64");