某款28nm cortex-A7 Dhrystone DMIPS测试

下载，编译，排错，再编译，再排错，编译PASS，一顿操作之后，dhrystone成功被移植到某款Cortex-A7平台，主频跑1.2G HZ的情况下，结果如下：

msh />dhrystone

Dhrystone Benchmark, Version 2.1 (Language: C)

Program compiled without 'register' attribute

Please give the number of runs through the benchmark: 
Execution starts, 100000000 runs through Dhrystone
Execution ends

Final values of the variables used in the benchmark:

Int_Glob:            5
        should be:   5
Bool_Glob:           1
        should be:   1
Ch_1_Glob:           A
        should be:   A
Ch_2_Glob:           B
        should be:   B
Arr_1_Glob[8]:       7
        should be:   7
Arr_2_Glob[8][7]:    100000010
        should be:   Number_Of_Runs + 10
Ptr_Glob->
  Ptr_Comp:          -1029845352
        should be:   (implementation-dependent)
  Discr:             0
        should be:   0
  Enum_Comp:         2
        should be:   2
  Int_Comp:          17
        should be:   17
  Str_Comp:          DHRYSTONE PROGRAM, SOME STRING
        should be:   DHRYSTONE PROGRAM, SOME STRING
Next_Ptr_Glob->
  Ptr_Comp:          -1029845352
        should be:   (implementation-dependent), same as above
  Discr:      0
        should be:   0
  Enum_Comp:         1
        should be:   1
  Int_Comp:          18
        should be:   18
  Str_Comp:          DHRYSTONE PROGRAM, SOME STRING
        should be:   DHRYSTONE PROGRAM, SOME STRING
Int_1_Loc:           5
        should be:   5
Int_2_Loc:           13
        should be:   13
Int_3_Loc:           7
        should be:   7
Enum_Loc:            1
        should be:   1
Str_1_Loc:           DHRYSTONE PROGRAM, 1'ST STRING
        should be:   DHRYSTONE PROGRAM, 1'ST STRING
Str_2_Loc:           DHRYSTONE PROGRAM, 2'ND STRING
        should be:   DHRYSTONE PROGRAM, 2'ND STRING

Microseconds for one run through Dhrystone:    0.4 
Dhrystones per Second:                      2777777.8 

拢共才0.4个DMIPS,有点惨，怎么看这个数据都有问题，我还是不相信是CPU的锅，而是某个性能瓶颈充当了木桶上最短的那块木板，比如访存速率等等。

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结束！