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ST20-C1 Datasheet(PDF) 181 Page - STMicroelectronics

Part # ST20-C1
Description  Instruction Set Reference Manual
PDF  205 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

ST20-C1 Datasheet(HTML) 181 Page - STMicroelectronics

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Consider compiling the following switch expression:
switch X
c1
P1
...
cn
Pn
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)
P1
else if (X = c2)
P2
...
else if (X = cn)
Pn
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
c1
P1
...
ci-1
Pi-1



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