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Small tweak to previous (convert multiplication to bitshift)

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This commit is contained in:
Ilari Liusvaara 2014-03-26 13:00:52 +02:00
parent 39d2ecaa62
commit bc6b3adc6c
1 changed files with 2 additions and 2 deletions
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4
src/library/triplebuffer.cpp
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@ -36,7 +36,7 @@ void logic::put_read() throw(std::logic_error)
unsigned logic::get_write() throw() unsigned logic::get_write() throw()
{ {
const unsigned magic = 0x1099; const unsigned magic = 0x010219;
threads::alock h(lock); threads::alock h(lock);
if(count_write > 0) { if(count_write > 0) {
//We already are writing => The same as previously. //We already are writing => The same as previously.
@ -45,7 +45,7 @@ unsigned logic::get_write() throw()
} else { } else {
//We are beginning a new write => Pick one that isn't last_complete nor current_read. //We are beginning a new write => Pick one that isn't last_complete nor current_read.
count_write++; count_write++;
unsigned tmp = 6 * last_complete + 2 * current_read; unsigned tmp = ((last_complete << 2) | current_read) << 1;
current_write = (magic >> tmp) & 3; current_write = (magic >> tmp) & 3;
return current_write; return current_write;
} }