Matt Devereau 8ff47f6032 [LoopVectorize] Enable integer Mul and Add as select reduction patterns ...

This patch vectorizes Phi node loop reductions for select's whos condition
comes from a floating-point comparison, with its operands being integers
for Add, Sub, and Mul reductions.

Example:

int foo(float *x, int n) {
    int sum = 0;
    for (int i=0; i<n; ++i) {
        float elem = x[i];
        if (elem > 0) {
            sum += 2;
        }
    }
    return sum;
}

This would previously fail to vectorize due to the integer reduction.

2023-01-30 09:41:40 +00:00

38 KiB

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