Q46448: Capabilities and Limits of the /R switch on 80386 Machines
Article: Q46448 Product(s): See article Version(s): 2.20 2.30 2.35 3.00 | 2.20 2.30 2.35 3.00 Operating System(s): MS-DOS | OS/2 Keyword(s): ENDUSER | 386 | mspl13_basic Last Modified: 12-APR-1990 The /R command line switch for CodeView beginning with Version 2.20 is used only on 80386 machines. The /R switch tells CodeView to use the four debug registers available on the 80386 chip, and also allows hardware breakpoints. This causes CodeView to run faster when performing debugger-intensive steps such as monitoring a tracepoint. The /R switch works under DOS and OS/2's DOS compatibility box. It is an unrecognized switch under OS/2. The /R switch speeds operation of Tracepoint but not Watchpoint or Breakpoint commands. Note: because there are only four debug registers, only four tracepoints (of up to 4 bytes each) may be specified when utilizing these registers. Specifying any combination of tracepoints greater than 16 bytes will require CodeView to use software tracepoints rather than the debug registers and all performance gains will be lost.
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