[PATCH] D28961: [SLP] Fix for PR31690: Allow using of non-zero initial values in horizontal instructions.

Alexey Bataev via Phabricator via llvm-commits llvm-commits at lists.llvm.org
Fri Jan 20 11:05:47 PST 2017

ABataev created this revision.

Currently, LLVM supports vectorization of horizontal reduction instructions with initial value set to 0. Patch supports vectorization of reduction with non-zero initial values. Also, it supports a vectorization of instructions with some extra arguments, like:

  float f(float x[], int a, int b) {
    float p = a % b;
    p += x[0] + 3;
    for (int i = 1; i < 32; i++)
      p += x[i];
    return p;

Patch allows vectorization of this kind of horizontal reductions.



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