https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66199
Bug ID: 66199 Summary: [4.9/5 Regression] lastprivate/linear clause issues on combined constructs Product: gcc Version: 5.1.1 Status: UNCONFIRMED Keywords: rejects-valid, wrong-code Severity: normal Priority: P3 Component: middle-end Assignee: jakub at gcc dot gnu.org Reporter: jakub at gcc dot gnu.org Target Milestone: --- The following testcase is incorrectly rejected in 4.9/5, eventhough the variables are either explicitly or implicitly mentioned on the combined construct. There is also a wrong-code issue in f3/f4 if default(none) clause is removed. int u[1024], v[1024], w[1024], m; __attribute__((noinline, noclone)) long f1 (long a, long b) { long d; #pragma omp parallel for simd default(none) firstprivate (a, b) shared(u, v, w) for (d = a; d < b; d++) u[d] = v[d] + w[d]; return d; } __attribute__((noinline, noclone)) long f2 (long a, long b, long c) { long d; #pragma omp parallel for simd default(none) firstprivate (a, b) shared(u, v, w) linear(d) linear(c:5) for (d = a; d < b; d++) { u[d] = v[d] + w[d]; c += 5; } return d + c; } __attribute__((noinline, noclone)) long f3 (long a1, long b1, long a2, long b2) { long d1, d2; #pragma omp parallel for simd default(none) firstprivate (a1, b1, a2, b2) shared(u, v, w) lastprivate(d1, d2) collapse(2) for (d1 = a1; d1 < b1; d1++) for (d2 = a2; d2 < b2; d2++) u[d1 * 32 + d2] = v[d1 * 32 + d2] + w[d1 * 32 + d2]; return d1 + d2; } __attribute__((noinline, noclone)) long f4 (long a1, long b1, long a2, long b2) { long d1, d2; #pragma omp parallel for simd default(none) firstprivate (a1, b1, a2, b2) shared(u, v, w) collapse(2) for (d1 = a1; d1 < b1; d1++) for (d2 = a2; d2 < b2; d2++) u[d1 * 32 + d2] = v[d1 * 32 + d2] + w[d1 * 32 + d2]; return d1 + d2; } int main () { if (f1 (0, 1024) != 1024 || f2 (0, 1024, 17) != 1024 + 17 + 5 * 1024 || f3 (0, 32, 0, 32) != 64 || f4 (0, 32, 0, 32) != 64) __builtin_abort (); return 0; }