Another $clog2 bugfix

diff --git a/frontends/ast/simplify.cc b/frontends/ast/simplify.cc
index 9e797573ce62708dd4d1b6aafa51546411adb65b..969cc23026dc0f05ee5094d1724e0ef796a7861e 100644 (file)
--- a/frontends/ast/simplify.cc
+++ b/frontends/ast/simplify.cc
@@ -1365,6 +1365,8 @@ skip_dynamic_range_lvalue_expansion:;
                                        log_error("Failed to evaluate system function `%s' with non-constant value at %s:%d.\n", str.c_str(), filename.c_str(), linenum);
 
                                RTLIL::Const arg_value = buf->bitsAsConst();
+                               if (arg_value.as_bool())
+                                       arg_value = const_sub(arg_value, 1, false, false, SIZE(arg_value));
                                delete buf;
 
                                uint32_t result = 0;