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In SoftwareSerial, use ISR_ALIASOF to prevent duplication 

Previously, up to four separate but identical ISR routines were defined,
for PCINT0, PCINT1, PCINT2 and PCINT3. Each of these would generate
their own function, with a lot of push-popping because another function
was called.

Now, the ISR_ALIASOF macro from avr-libc is used to declare just the
PCINT0 version and make all other ISRs point to that one, saving a lot
of program space, as well as some speed because of improved inlining.

On an Arduino Uno with gcc 4.3, this saves 168 bytes. With gcc 4.8, this
saves 150 bytes.
This commit is contained in:
Matthijs Kooijman 2014-04-23 14:41:12 +02:00
parent 157ec97540
commit 17b9b53737
1 changed files with 3 additions and 12 deletions
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15
libraries/SoftwareSerial/SoftwareSerial.cpp
View File

@ -316,24 +316,15 @@ ISR(PCINT0_vect)
#endif
#if defined(PCINT1_vect)
ISR(PCINT1_vect)
{
SoftwareSerial::handle_interrupt();
}
ISR(PCINT1_vect, ISR_ALIASOF(PCINT0_vect));
#endif
#if defined(PCINT2_vect)
ISR(PCINT2_vect)
{
SoftwareSerial::handle_interrupt();
}
ISR(PCINT2_vect, ISR_ALIASOF(PCINT0_vect));
#endif
#if defined(PCINT3_vect)
ISR(PCINT3_vect)
{
SoftwareSerial::handle_interrupt();
}
ISR(PCINT3_vect, ISR_ALIASOF(PCINT0_vect));
#endif
//