403.gcc
SPEC CPU2006 Benchmark Description

Benchmark Name

403.gcc

Benchmark Author

Richard Stallman and a large cast of helpers. For a full list, see http://gcc.gnu.org/onlinedocs/gcc/Contributors.html .

Benchmark Program General Category

C Language optimizing compiler

Benchmark Description

403.gcc is based on gcc Version 3.2. It generates code for an AMD Opteron processor. The benchmark runs as a compiler with many of its optimization flags enabled.

403.gcc has had its inlining heuristics altered slightly, so as to inline more code than would be typical on a Unix system in 2002. It is expected that this effect will be more typical of compiler usage in 2006. This was done so that 403.gcc would spend more time analyzing its source code inputs, and use more memory. Without this effect, 403.gcc would have done less analysis, and needed more input workloads to achieve the run times required for CPU2006.

Input Description

There are 9 input workloads in 403.gcc. These files are preprocessed C code (.i files):

cp-decl.i and expr.i come from the source files of 176.gcc from CPU2000.
166.i is made by concatenating the Fortran source files of a SPECint2000 candidate benchmark, then using the f2c translator to produce C code, and then pre-processing.
200.i comes via the same method from a previous version of the SPECfp2000 benchmark 200.sixtrack.
scilab.i comes via the same method from a version of the Scilab program.
Expr2.i comes from the source of 403.gcc, as does c-typeck.i.
g23.i comes from fold-const.c from 403.gcc, and s04.i comes from sched-deps.c of 403.gcc

Output Description

All output files are x86-64 assembly code files.

Programming Language

Known portability issues

Some of the optimizations 403.gcc performs require constant propagation of floating point constants. These form an insignificant amount of computation time, yet may depend on IEEE floating point format to produce a correct result.
403.gcc is not an ANSI C program. It uses GNU extensions.
The initial port of 403.gcc was to a 64 bit system. It has been successfully ported by SPEC to many 32-bit UNIX implementations.

Portability issues fixed subsequent to the release of SPEC CPU2006 V1.0

In V1.1 of CPU2006, '#line' directives were removed from c-parse.c
Several code segments which were protected by
```
#if !defined(SPEC_CPU2006)
```
should have said SPEC_CPU, and these were fixed In V1.1 of CPU2006. The effect of the change is to increase the degree to which both gcc and non-gcc compilers are presented with the same souce code when compiling 403.gcc.

References

See the GCC home page at http://gcc.gnu.org

Last updated: $Date: 2008-04-12 08:31:17 -0400 (Sat, 12 Apr 2008) $

403.gcc SPEC CPU2006 Benchmark Description