https://gcc.gnu.org/bugzilla/show_bug.cgi?id=56118
--- Comment #4 from Marc Glisse <glisse at gcc dot gnu.org> ---
#include <x86intrin.h>
__m128d f(){
__m128d r;
r[0]=1;
r[1]=2;
return r;
}
Currently, SLP vectorizes it with -fvect-cost-model=unlimited, but not by
default because:
Vector inside of basic block cost: 1
Vector prologue cost: 1
Vector epilogue cost: 0
Scalar cost of basic block: 2
r.c:4:9: note: not vectorized: vectorization is not profitable.
And if r is initialized to {3,4} as in the initial testcase, we don't vectorize
either:
r.c:3:17: note: not vectorized: no vectype for stmt: # .MEM_2 = VDEF
<.MEM_1(D)>
rD.15637 = { 3.0e+0, 4.0e+0 };
scalar_type: __m128dD.4386
r.c:3:17: note: not vectorized: not enough data-refs in basic block.
