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Diffstat (limited to 'gcc/tree-ssa-loop-niter.c')
| -rw-r--r-- | gcc/tree-ssa-loop-niter.c | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/gcc/tree-ssa-loop-niter.c b/gcc/tree-ssa-loop-niter.c index 95bb5cf..191a071 100644 --- a/gcc/tree-ssa-loop-niter.c +++ b/gcc/tree-ssa-loop-niter.c @@ -2151,6 +2151,10 @@ number_of_iterations_exit_assumptions (struct loop *loop, edge exit, affine_iv iv0, iv1; bool safe; + /* Nothing to analyze if the loop is known to be infinite. */ + if (loop_constraint_set_p (loop, LOOP_C_INFINITE)) + return false; + safe = dominated_by_p (CDI_DOMINATORS, loop->latch, exit->src); if (every_iteration && !safe) @@ -2236,6 +2240,11 @@ number_of_iterations_exit_assumptions (struct loop *loop, edge exit, niter->max = wi::to_widest (iv_niters); } + /* There is no assumptions if the loop is known to be finite. */ + if (!integer_zerop (niter->assumptions) + && loop_constraint_set_p (loop, LOOP_C_FINITE)) + niter->assumptions = boolean_true_node; + if (optimize >= 3) { niter->assumptions = simplify_using_outer_evolutions (loop, |