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cb61a09b
2016 Jan 04
2
Fwd: Strength reduction in loops
Here is a simple loop:
long foo(int len, long* s) {
long sum = 0;
for (int i=0; i<len; i++)
sum += s[i*12];
return sum;
}
There is a multiplication in each loop iteration. Can this be turned
into addition, and is there already a pass that does?
(https://en.wikipedia.org/wiki/Strength_reduction uses this very
situation as an example in the opening paragraph:
"In