Siemens Nixdorf / Pyramid compiler flags for pyrC 5.0 (as of Nov. 1996)
=======================================================================

The following is a list of short explanations of compiler/linker flags
used for the Oct./Nov. 1996 SPEC CINT95 result submissions for 
Siemens Nixdorf / Pyramid RM systems (RM400-C90, RM600-E20/-E60).


1. Compiler Flags	  

	-WM,-Omips4
	     Performs all safe and generally applicable optimizations
	     including interprocedural optimizations, register
	     allocation across function calls and feedback directed
	     optimizations (function inlining, procedure positioning,
	     branch elimination, procedure splitting, register
	     allocation and cross basic block scheduling).  This flag
	     also directs the compiler to produce nonposition-
	     independent code, to generate code using the instruction
	     set of the MIPS4 ISA, to inline alloca, printf, memcpy,
	     memset, memcmp, and memmove and to use U-code system
	     libraries (these libraries represent the same system
	     services as their regular counterparts, but in a form
	     more suitable for interprocedural optimization).

	-WM,-G<num>
	     Specifies that data items smaller than <num> bytes in
	     size should be placed in the global data area and accessed
	     using a faster addressing mode.

	-Wo,-loopunroll:<num>    
	     Tells the optimizer to unroll loops <num> times.
	     -WM,-Omips4 sets <num> to 8.

	-Wo,unrolllimit:<num>      
	     <num> is the limit on the number of instructions within a 
             loop unrolled by the optimizer.
	     -WM,-Omips4 sets <num> to 2000.

	-Wg,-inline_limit:<num>	  
	     Sets a size threshold for inlining.  A call will not be
	     inlined if the resulting function (after inlining) exceeds 
	     <num> basic blocks.
	     Default is 500.
	     
	-Wb,-prefetch,<min_freq>,<mem_latency>
	     This will insert prefetch instructions in loops if the
	     loop appears to access memory in a serial fashion.  Only
	     loops which have at least <min_freq> iterations are
	     considered.  <mem_latency> is the expected latency for
	     fetches from memory in units of machine instruction
	     cycle times.
	     -WM,-Omips4 sets <min_freq> to 40 and <mem_latency> to 400.

	-qfeedback
	     Produce code that collects call graph and flow graph
	     information suitable for feedback directed optimization.

	-WM,-profdir <dir>
	     Specifies that profiling information should be written to
	     and read from the directory <dir>.
	     The default is subdirectory PROF of the source directory.

2. Linker Flags	  

	-dn  This option is passed to ld.  It specifies static linking 
             in the link editor.

3. Portability Flags:

    -DI_TIME
    -DI_SYS_TIME
	     Enables certain (SPEC-approved) source code parts via conditional
	     compilation.

4. Questions?

More details about these and other flags can be found in the appropriate
documentation (manuals, release notes). Additional SPEC-specific questions
can be directed to the Siemens Nixdorf SPEC representative

	Reinhold Weicker
	Siemens Nixdorf
	OEC HES PM4
	33094 Paderborn
	Germany
    E-Mail:
	weicker.pad@sni.de

5. Caveat

It is likely that future result submissions, if they use new compiler
versions, will have different flags; then this flag description will
be superseded by a new one. For results obtained, for older systems,
with earlier compilers, see the earlier flag descriptions:
  http://www.specbench.org/osg/cpu95/flags/Siemens-*.txt
and
  http://www.specbench.org/osg/cpu95/flags/Pyramid-*.txt