TMTPOST -- Shares of Synopsys (SNPS) and Cadence Design Systems (CDNS) jumped in premarket trading Thursday after the U.S. government lifted export restrictions on advanced chip design software to China, marking a potential easing of tech tensions between Washington and Beijing. The two American firms, along with Germany’s Siemens, confirmed they would resume access to their electronic design automation (EDA) tools for Chinese clients. Synopsys gained 5.9% and Cadence rose 5.4% in U.S. trading, while Siemens advanced 1.3% in Frankfurt.