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Branch Misses

Name: Anonymous 2011-09-26 17:26

How bad do branch misses hurt a programs performance? In C and Java?

for example how big of an impact would :


int shitinanus()
{
    int val = getanus();
    if(val != 0)
        return ANALTONIGHT;
    return ALONETONIGHT;
}


be knowing that val will most likely be 0 99% of the time compared to the below function


int shitinanus()
{
    int val = getanus();
    if(val == 0)
        return ALONETONIGHT;
    return ANALTONIGHT;
}

Name: Anonymous 2011-09-28 23:41

>>74
I'm with >>73. In a concurrent environment some semantics will change underneath you. Non-reentrant code becomes unsafe.

But I'm with you too. C is old.

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