On Wed, 18 Jan 2017, Richard Biener wrote: > But I guess I was asking whether you could initially emit > > void *omp_simt = IFN_GOMP_SIMT_ENTER (0); > > for (int i = n1; i < n2; i++) > foo (&tmp); > > IFN_GOMP_SIMT_EXIT (omp_simt); > > and only after inlining do liveness / use analysis of everything between > SIMT_ENTER and SIMT_EXIT doing the rewriting only at that point.
No, I don't think so. Such analysis would need to know whether the variable was originally private to that SIMD region. And we cannot allow the compiler to move references to privatized data on per-lane stacks outside of their regions (because the underlying per-lane storage is no longer available). Hence the need for explicit up-front privatization. Alexander
