Re: [RFC] GCC vectorizer misses an opportunity to hoist loop invariant load after loop versioning.

I have submitted a bugreport through GCC Bugzilla. The link is http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58508. thanks, Cong On Fri, Sep 20, 2013 at 12:57 AM, Richard Biener wrote: > On Wed, Sep 18, 2013 at 10:59 PM, Xinliang David Li > wrote: >> On Wed, Sep 18, 2013 at 1:23

[RFC] GCC vectorizer misses an opportunity to hoist loop invariant load after loop versioning.

First, look as the code below. void foo(int* a, int* b, int n) { int i; for (i = 0; i < n; ++i) a[i] = *b; } This loop contains possible aliasing between a[i] and *b, and in order to vectorize this loop, GCC produces two versions of the loop, and only vectorizes the one in which

Resolving an issue of bootstrap failure from vectorization.

Hi My name is Cong Hou, and I am a Noogler working in the compiler optimization team at Google. When we were trying moving the vectorization from O3 to O2 in GCC 4.9, we met a bootstrap failure from comparison between stage 2&3. This failure is caused by a potential bug in GCC as stated b