I wrote:
> I made some cosmetic changes to this and committed it.
BTW, poking at this further, it seems that the patch only really
works for gcc. clang accepts the -ftree-vectorize switch, but
looking at the generated asm shows that it does nothing useful.
Which is odd, because clang does do loop vectorization.
I tried adding -Rpass-analysis=loop-vectorize and got
numeric.c:8341:3: remark: loop not vectorized: could not determine number of loop iterations
[-Rpass-analysis=loop-vectorize]
for (i2 = 0; i2 <= i; i2++)
^
which is interesting but I don't know how to proceed further.
regards, tom lane