Reply by fjulink ●July 31, 20022002-07-31

I try to measure 7 instructions. It spend about 13-14 clock

ex:
line1 mvkl .s2 0x0001,b0
mvklh .s2 0xa000,b0
mvk .s1 0x1111,a1
mvklh .s1 0x1111,a1
mvkl .s2 0x0000,b1
mvklh .s2 0x24D3,b1
mvk .s1 0x1111,a1
line8 mvklh .s1 0x1111,a1
line9 ........

I set breakpoint at line9 and put line1 to line7 as range1
line1 to line8 as range2 in my session

the result:

range1
Incl.Count Incl. Total Incl.Max Incl.Min Incl. Average
2 14 14 14 7

Excl.Count Excl. Total Excl.Max Excl.Min Excl. Average
1 13 13 13 13

range2

Incl.Count Incl. Total Incl.Max Incl.Min Incl. Average
1 20 20 20 20
Excl.Count Excl. Total Excl.Max Excl.Min Excl. Average
1 19 19 19 19 What is the different between Incl. ... and Excl. ... above
the result?

why and mean what about the "Incl. Count" =2 ?

Fjulink
--- In c6x@y..., "Dillon, Tom" <tjdillon@t...> wrote:
> A single cycle instruction takes 1 cycle. But, there is a pipeline
that has
> an impact on the measurement you made. You can try an experiment
to prove
> it to yourself. Add 7 more instructions to the example you give
below and
> then measure the total for the 8 instructions. My bet is that you
will see
> 13-14 cycles and not (6*8Hcycles).
>
> -----Original Message-----
> From: fjulink [mailto:fjulink@y...]
> Sent: Tuesday, July 30, 2002 9:39 AM
> To: c6x@y...
> Subject: [c6x] CCS V2.0 & C6711DSK About the single - cycle
instruction
>
>
> Hi all:
>
> I use the tool "Enable clock" try to test how much time the
> single -cycle instruction need,
>
> EX:
> mvkl .s2 0x0001,b0
>
> The resule of the view window show => 6 clocks
>
> ==>so "mvkl .s2 0x0001,b0" spend 6*6.7ns = 40.2 ns
> (the c6711 one clock time = 6.7ns) > The single -cycle instruction means the instruction will be
> execute in one cpu cycle? > Are there any mistake above ?
>
> Please correct me!
>
> Thanks!! Fjulink >
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Reply by Dillon, Tom ●July 30, 20022002-07-30
RE: [c6x] CCS V2.0 & C6711DSK About the single - cycle instruction

A single cycle instruction takes 1 cycle.  But, there is a pipeline that has an impact on the measurement you made.  You can try an experiment to prove it to yourself.  Add 7 more instructions to the example you give below and then measure the total for the 8 instructions.  My bet is that you will see 13-14 cycles and not (6*8Hcycles).

-----Original Message-----
From: fjulink [mailto:f...@yahoo.com.tw]
Sent: Tuesday, July 30, 2002 9:39 AM
To: c...@yahoogroups.com
Subject: [c6x] CCS V2.0 & C6711DSK About the single - cycle instruction


Hi all:
   
     I use the tool "Enable clock" try to test how much time   the
single -cycle instruction  need,

    EX:
        mvkl  .s2 0x0001,b0

The resule of the view window show  => 6 clocks

  ==>so "mvkl  .s2 0x0001,b0" spend  6*6.7ns = 40.2 ns
       (the c6711 one clock time = 6.7ns)
   
  
     The single -cycle instruction means the instruction will be
execute in one cpu cycle? 
    

      Are there any  mistake  above ?
     
      Please correct me!
 
      Thanks!!                                 Fjulink
 

 



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