From 990a2341581f68077e2ce5a0628bd519b8e7907c Mon Sep 17 00:00:00 2001
From: baewoojin <dnwls514@ajou.ac.kr>
Date: Thu, 20 Aug 2020 16:22:30 +0900
Subject: [PATCH] Update README.md
---
testing/README.md | 36 ++++++++++++++++++++++++++++++++++--
1 file changed, 34 insertions(+), 2 deletions(-)
diff --git a/testing/README.md b/testing/README.md
index 2fe2f99..1cea696 100644
--- a/testing/README.md
+++ b/testing/README.md
@@ -10,6 +10,7 @@
- 1.1.2 basic concept
- To operate several calculation for fixed-point numebr type casting is essential.
- Correct type conversion is very important in order to accurately calculate and avoid missing bits.
+ - in iteration2, with using shift operation can create a variety of functions that perform differently under different conditions.
- 1.1.3 concept of fixed-point number
- 
- a. data types in computer langauge always have fixed length
@@ -23,7 +24,7 @@
## 2. overall description
### - 2.1 product functions
- 2.1.1 list of fuctions
- - 2.1.1.1 stpe 1
+ - 2.1.1.1 iteration 1
- a. add
~~~
#define fx_add(a, b) ((a)+(b))
@@ -83,4 +84,35 @@
- to do sqrt operation with fixed point number there is need to type conversion
- first convert fixed number to double
- second do sqrt operation with math library
- - thrid conver result calculated by second step to double and return result
\ No newline at end of file
+ - thrid conver result calculated by second step to double and return result
+ - 2.1.1.2 iteration 2
+ - a. mul
+ ~~~
+ ((fa * fb) >> FX32_QNUM )
+ ~~~
+ - fuction that multiplies fa and fb and divides it by 2^32
+ - b. mul1
+ ~~~
+ ((fa>>16) * fb)>>16)
+ ~~~
+ - Same as fx32_mul, the same fuction as fa*fb>>32, first multiply fa/2^16 and fb, and divide the remaining 2^16
+ - c. mul2
+ ~~~
+ (((fa>>8)*(fb>>8))>>16)
+ ~~~
+ - Same as above, the same fuction as fa*fb>>32, first multiply fa/2^8, fb/2^8, and divide the remaining 2^16
+ - d. div
+ ~~~
+ ((((fixed64)(fa) << FX32_QNUM) /(fb)))
+ ~~~
+ - fuction that multiplies fa by 2^32 and divides fb.
+ - e. div1
+ ~~~
+ ((((fa)<<16)/(fb))<<16)
+ ~~~
+ - Same as above, it has the same fuction as (fa<<32)/fb. First, fa is multiplied by 2^16 and divided by fb, and then the remaining 2^16 is multiplied
+ - f. div2
+ ~~~
+ ((((fa)<<24)/(fb))<<8)
+ ~~~
+ - same as above, it has the same fuction as (fa<<32)/fb. First, fa is multiplied by 2^24, divided by fb, and then the remaining 2^8 is multiplied.
\ No newline at end of file
--
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