Example Analysis of HLS Lesson20
Today, I will talk to you about the example analysis of HLS Lesson20. Many people may not know much about it. In order to make you understand better, the editor has summarized the following for you. I hope you can get something according to this article.
1. Improved throughput: essentially achieved by improving parallelism
When pipeline acts on a function, there is no gap in the data from the IO point of view, while when acting on a loop, there will be a gap between the two adjacent loops.
two。 Improve latency
3. Improve area
Example: cordic
Here, the value range of z0 is required to be [- π / 2, π / 2]. For the number of [- π, π], it is necessary to pre-process and map to [- π / 2, π / 2], and then calculate it, and finally carry out post-processing.
# include "cordic.h"
Void pre_cir_cordic (di_t full_alpha,di_t & alpha,flag_t & flag)
{
If (full_alpha > PI/2)
{
Alpha=PI-full_alpha
Flag=2
}
Else if (full_alpha > m)
Yi [massi1] = Yi [m] + (xi [m] > > m)
Zi [massi1] = Zii [m]-myarctan [m]
}
Else
{
Xi [massi1] = Xi [m] + (yi [m] > > m)
Yi [massi1] = Yi [m]-(Xi [m] > > m)
Zi [massi1] = Zii [m] + myarctan [m]
}
Flag_delay_ a [m + 1] = flag_delay_ a [m]
}
Mysin= Yi [N-1]
Mycos= Xi [N-1]
Flag_delay=flag_delay_ a [N-1]
}
Void post_cir_cordic (do_t mysin,do_t mycos,flag_t flag_delay,do_t & sin_out,do_t & cos_out)
{
Switch (int (flag_delay))
{
Case 2 rig sinuous outflow mystical cosmetic outflow color mycosmic break
Case 3bloc sinuous outflow mystical cosmetic outflow color mycosmic break
Default:sin_out=mysin;cos_out=mycos;break
}
}
Void cir_cordic (di_t full_alpha,do_t & sin_out,do_t & cos_out)
{
Di_t alpha
Flag_t flag
Do_t mysin
Do_t mycos
Flag_t flag_delay
Pre_cir_cordic (full_alpha,alpha,flag)
Cir_cordic_calc (alpha,flag,mysin,mycos,flag_delay)
Post_cir_cordic (mysin,mycos,flag_delay,sin_out,cos_out)
}
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