Exhibit 11.1


           LSI LOGIC CORPORATION
    CALCULATION OF EARNINGS PER SHARE
    (In thousands, except per share amounts)
    (Unaudited)


                              				Three Months Ended    Nine Months Ended
           			                        September 30,        September 30,
                                      1997   1996      1997     1996
                           				                      
Primary Earnings Per Share                                            

Net income                         $ 44,318  $27,743 $128,524 $116,523
Average common and common
  equivalent shares:
 Average common shares outstanding  141,826  128,524  137,873  129,176
 Dilutive options                     2,606    1,700    3,010    2,347
                                    144,432  130,224  140,883  131,523       
                                            
Earnings per common and common            
  equivalent share                    $0.31    $0.21    $0.91    $0.89


Fully Diluted Earnings Per Share                                      

Net income                         $ 44,318 $ 27,743 $128,524 $116,523
Interest expense on convertible                         
subordinated debt, net of tax effect      -    1,542    1,279    4,625
Adjusted net income                $ 44,318  $29,285 $129,803 $121,148
Average common and common 
  equivalent shares on a fully
  diluted basis:
 Average common shares outstanding  141,826  128,524  141,526  129,176
 Convertible subordinated debt            -   11,735        -   11,735
 Dilutive options                     2,680    1,841    3,017    2,348
                                    144,506  142,100  144,543  143,259       
                                             
Fully diluted earnings per common                                     
and common equivalent share           $0.31    $0.21    $0.90    $0.85