[Bug tree-optimization/121290] [16 regression] Regressions in TSVC s119, s3113, s312, s313, s314, s315, s316 since r16-2159-g3bf2aa834e1270

[tnfchris at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=121290

--- Comment #9 from Tamar Christina <tnfchris at gcc dot gnu.org> ---
Right, so the real tsvc calls

dummy(a, b, c, d, e, aa, bb, cc, chksum);

in each of these to make it so you can't elide the outer loop.

So back to costing.  The scalar loop inner costing is quite weird, in
particular it thinks the loop executes in 0 cycles..

Having a look at how we arrive at this first.