[llvm-dev] Particular type of loop optimization

[Gleison Souza via llvm-dev]

Dear LLVMers,

    I am trying to implement a particular type of loop optimization, but I
am having problems with global variables. To solve this problem, I would
like to know if LLVM has some pass that moves loads outside loops. I will
illustrate with an example. I want to transform this code below. I am
writing in C for readability, but I am analysing LLVM IR:

int *vectorE;

void foo (int n) {
  int i;
  for (i = 0; i < n; i++)
    vectorE[i] = i;
}

into this one:

int *vectorE;

void foo (int n) {
  int i;
  int* aux = vectorE;
  for (i = 0; i < n; i++)
    aux[i] = i;
}

Regards,

Gleison
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