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Linux/arch/sparc/lib/ffs.S

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Diff markup

Differences between /arch/sparc/lib/ffs.S (Architecture mips) and /arch/alpha/lib/ffs.S (Architecture alpha)


  1 /* SPDX-License-Identifier: GPL-2.0 */            
  2 #include <linux/export.h>                         
  3 #include <linux/linkage.h>                        
  4                                                   
  5         .register       %g2,#scratch              
  6                                                   
  7         .text                                     
  8         .align  32                                
  9                                                   
 10 ENTRY(ffs)                                        
 11         brnz,pt %o0, 1f                           
 12          mov    1, %o1                            
 13         retl                                      
 14          clr    %o0                               
 15         nop                                       
 16         nop                                       
 17 ENTRY(__ffs)                                      
 18         sllx    %o0, 32, %g1            /* 1      
 19         srlx    %o0, 32, %g2                      
 20                                                   
 21         clr     %o1                     /* 2      
 22         movrz   %g1, %g2, %o0                     
 23                                                   
 24         movrz   %g1, 32, %o1            /* 3      
 25 1:      clr     %o2                               
 26                                                   
 27         sllx    %o0, (64 - 16), %g1     /* 4      
 28         srlx    %o0, 16, %g2                      
 29                                                   
 30         movrz   %g1, %g2, %o0           /* 5      
 31         clr     %o3                               
 32                                                   
 33         movrz   %g1, 16, %o2            /* 6      
 34         clr     %o4                               
 35                                                   
 36         and     %o0, 0xff, %g1          /* 7      
 37         srlx    %o0, 8, %g2                       
 38                                                   
 39         movrz   %g1, %g2, %o0           /* 8      
 40         clr     %o5                               
 41                                                   
 42         movrz   %g1, 8, %o3             /* 9      
 43         add     %o2, %o1, %o2                     
 44                                                   
 45         and     %o0, 0xf, %g1           /* 10     
 46         srlx    %o0, 4, %g2                       
 47                                                   
 48         movrz   %g1, %g2, %o0           /* 11     
 49         add     %o2, %o3, %o2                     
 50                                                   
 51         movrz   %g1, 4, %o4             /* 12     
 52                                                   
 53         and     %o0, 0x3, %g1           /* 13     
 54         srlx    %o0, 2, %g2                       
 55                                                   
 56         movrz   %g1, %g2, %o0           /* 14     
 57         add     %o2, %o4, %o2                     
 58                                                   
 59         movrz   %g1, 2, %o5             /* 15     
 60                                                   
 61         and     %o0, 0x1, %g1           /* 16     
 62                                                   
 63         add     %o2, %o5, %o2           /* 17     
 64         xor     %g1, 0x1, %g1                     
 65                                                   
 66         retl                            /* 18     
 67          add    %o2, %g1, %o0                     
 68 ENDPROC(ffs)                                      
 69 ENDPROC(__ffs)                                    
 70 EXPORT_SYMBOL(__ffs)                              
 71 EXPORT_SYMBOL(ffs)                                
 72                                                   
 73         .section        .popc_6insn_patch, "ax    
 74         .word           ffs                       
 75         brz,pn  %o0, 98f                          
 76          neg    %o0, %g1                          
 77         xnor    %o0, %g1, %o1                     
 78         popc    %o1, %o0                          
 79 98:     retl                                      
 80          nop                                      
 81         .word           __ffs                     
 82         neg     %o0, %g1                          
 83         xnor    %o0, %g1, %o1                     
 84         popc    %o1, %o0                          
 85         retl                                      
 86          sub    %o0, 1, %o0                       
 87         nop                                       
 88         .previous                                 
                                                      

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