From: Clifford Wolf <clifford@clifford.at>
Date: Tue, 18 Dec 2018 16:49:38 +0000 (+0100)
Subject: Fix segfault in AST simplify
X-Git-Tag: yosys-0.9~364
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=fdf7c421810e8718f7ee312ddd3cfdbfb65aa2ce;p=yosys.git

Fix segfault in AST simplify

(as proposed by Dan Gisselquist)

Signed-off-by: Clifford Wolf <clifford@clifford.at>
---

diff --git a/frontends/ast/simplify.cc b/frontends/ast/simplify.cc
index 55abe165f..83714f897 100644
--- a/frontends/ast/simplify.cc
+++ b/frontends/ast/simplify.cc
@@ -1810,6 +1810,11 @@ skip_dynamic_range_lvalue_expansion:;
 
 				log_assert(block != nullptr);
 
+				if (num_steps == 0) {
+					newNode = children[0]->clone();
+					goto apply_newNode;
+				}
+
 				int myidx = autoidx++;
 				AstNode *outreg = nullptr;