參數(shù)資料
型號： BENCHMARKING
英文描述： Benchmarking the Am186EM: Using the Dhrystone V2.1 As An Example Application Note? 1.66MB (PDF)
中文描述： 基準Am186EM：作為示例應用注意Dhrystone的V2.1版本？ 1.66MB（PDF格式）
文件頁數(shù)： 61/88頁
文件大?。?/td> 1701K
代理商： BENCHMARKING
61
**********************************************************************
Defines: The following "Defines" are possible:
-DREG=register (default: Not defined)
As an approximation to what an average C programmer
might do, the "register" storage class is applied
(if enabled by -DREG=register)
- for local variables, if they are used (dynamically)
five or more times
- for parameters if they are used (dynamically) six or
more times
Note that an optimal "register" strategy is compiler-
dependent, and that "register" declarations do not
necessarily lead to faster execution
-DNOSTRUCTASSIGN (default: Not defined)
Define if the C compiler does not support assignment of
structures.
-DNOENUMS (default: Not defined)
Define if the C compiler does not support enumeration
types.
-DTIMES (default)
-DTIME
The "times" function of UNIX (returning process times)
or the "time" function (returning wallclock time)
is used for measurement.
For single user machines, "time ()" is adequate.
For multi-user machines where you cannot get single-user
access, use the "times ()" function. If you have
neither, use a stopwatch in the dead of night.
"printf"s are provided marking the points "Start
Timer" and "Stop Timer". DO NOT use the UNIX
"time(1)" command, as this will measure the
total time to
run this program, which will (erroneously) include
the time to allocate storage (malloc) and to
perform the initialization.
-DHZ=nnn (default: 60)
The function "times" returns process times in
1/HZ seconds, with HZ = 60 for most systems.
CHECK YOUR SYSTEM DESCRIPTION BEFORE YOU JUST
APPLY THE DEFAULT VALUE.
**********************************************************************
Compilation model and measurement (IMPORTANT):
This C version of Dhrystone consists of three files:
- dhry_global.h
(this file, containing global definitions and comments)
- dhry_pack_1.c
- dhry_pack_2.c
The following "ground rules" apply for measurements:
- Separate compilation
- No procedure merging
- Otherwise,compiler optimizations are allowed but should be indicated
- Default results are those without register declarations
See the companion paper "Rationale for Dhrystone Version 2" for a more
detailed discussion of these ground rules.
For 16-Bit processors (e.g. 80186, 80286), times for all compilation
models ("small", "medium", "large" etc.) should be given if possible,
together with a definition of these models for the compiler system used.
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