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newino
2014 Nov 28
2
[LLVMdev] ScalarEvolution: Suboptimal handling of globals
Hi,
For the program below, where "incr" and "Arr" are globals
=================================
int incr;
float Arr[1000];
int foo ()
{
float x = 0;
int newInc = incr+1;
for (int i = 0; i < 1000; i++) {
for (int j = 0; j < 1000; j += incr) {
x += (Arr[i] + Arr[j]);
}
}
return x;
}
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The SCEV expression computed for the variable "j" is %j.0 = phi i32 [ 0, %for.body ], [ %add8, %for.inc...