ST20-C1 datasheet(181/205 Pages) STMICROELECTRONICS

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ST20-C1 데이터시트(PDF) 181 Page - STMicroelectronics

부품명	ST20-C1

상세설명	Instruction Set Reference Manual

PDF	205 Pages

Scroll/Zoom	100%

제조업체	STMICROELECTRONICS [STMicroelectronics]

홈페이지	http://www.st.com

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181 / 205 page

181/205

Consider compiling the following switch expression:

switch X

...

where, for brevity, it is assumed that all the switch selectors are already in increasing

order.

Three entries or less

This switch is compiled as:

if (X = c1)

else if (X = c2)

...

else if (X = cn)

Four to twelve entries

This switch is compiled as:

if (X <= cn/2 )

{

if (X <= cn/4 )

... etc.

else

... etc.

}

else

... etc.

Using a jump table

Assume that

ci ... cm form a third filled jump table. Then the switch is compiled as:

if ( X < ci )

{

switch X

...

ci-1

Pi-1

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