From 26493af58a1297d5d9fbb061694416deaee71220 Mon Sep 17 00:00:00 2001 From: Richard Biener Date: Tue, 30 Nov 2021 15:25:17 +0100 Subject: [PATCH] Add comment to indicate tail recursion My previous change removed an unreachable break; there (an unreachable continue; would have been more to the point). The following re-adds a comment explaining that WALK_SUBEXPR_TAIL does not fall through but tail recurses. 2021-11-30 Richard Biener gcc/fortran/ * frontend-passes.c (gfc_expr_walker): Add comment to indicate tail recursion. --- gcc/fortran/frontend-passes.c | 1 + 1 file changed, 1 insertion(+) diff --git a/gcc/fortran/frontend-passes.c b/gcc/fortran/frontend-passes.c index 16ee2afc9c0..4764c834f4f 100644 --- a/gcc/fortran/frontend-passes.c +++ b/gcc/fortran/frontend-passes.c @@ -5229,6 +5229,7 @@ gfc_expr_walker (gfc_expr **e, walk_expr_fn_t exprfn, void *data) case EXPR_OP: WALK_SUBEXPR ((*e)->value.op.op1); WALK_SUBEXPR_TAIL ((*e)->value.op.op2); + /* No fallthru because of the tail recursion above. */ case EXPR_FUNCTION: for (a = (*e)->value.function.actual; a; a = a->next) WALK_SUBEXPR (a->expr);