Exhibit 11.1 LSI LOGIC CORPORATION CALCULATION OF EARNINGS PER SHARE (In thousands, except per share amounts) (Unaudited) 				 Three Months Ended Six Months Ended 		 June 30, June 30, 1997 1996 1997 1996 Primary Earnings Per Share Net income $ 45,799 $ 46,496 $ 84,206 $ 88,780 Average common and common equivalent shares: Average commoon shares outstanding 	 141,418 129,019 129,506 129,106 Dilutive options 3,577 2,605 9,473 2,641 144,995 131,624 138,979 131,747 Earnings per common and common equivalent share $ 0.32 $ 0.35 $ 0.61 $ 0.67 Fully Diluted Earnings Per Share Net income $ 45,799 $ 46,496 $ 84,206 $ 88,780 Interest expense on convertible subordinated debt, net of 	tax effect - 1,542 1,279 3,083 Adjusted net income $ 45,799 $ 48,038 $ 85,485 $ 91,863 Average common and common equivalent shares on a fully diluted basis: Average common shares 	outstanding 141,418 129,019 129,506 129,106 Convertible subordinated 	debt 	 - 11,735 11,735 11,735 Dilutive options 3,580 2,605 3,227 2,645 144,998 143,359 144,468 143,486 Fully diluted earnings per common and common equivalent share $ 0.32 $ 0.34 $ 0.60 $ 0.64