[Bug target/80566] New: no use of avx vmovups on ymm registry in set and copy

[vincenzo.innocente at cern dot ch]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80566

            Bug ID: 80566
           Summary: no use of avx vmovups on ymm registry in set and copy
           Product: gcc
           Version: 8.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: target
          Assignee: unassigned at gcc dot gnu.org
          Reporter: vincenzo.innocente at cern dot ch
  Target Milestone: ---

in this example
#include <cstring>
int * foo() {
  int * p = new int[16];
  memset(p,0,16*sizeof(int));
  return p;
}
int * foo(int * q) {
  int * p = new int[16];
  memcpy(q,p,16*sizeof(int));
  return p;
}

gcc does not make use of vmovups on ymm registry 
( c++ -O3 -Wall -march=haswell -S)
while (according to gcc.godbolt.org) clang 4.0 does
https://godbolt.org/g/qnX975