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Linux/arch/xtensa/lib/mulsi3.S

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Diff markup

Differences between /arch/xtensa/lib/mulsi3.S (Version linux-6.12-rc7) and /arch/i386/lib/mulsi3.S (Version linux-4.18.20)


  1 /* SPDX-License-Identifier: GPL-2.0-or-later W    
  2 #include <linux/linkage.h>                        
  3 #include <asm/asmmacro.h>                         
  4 #include <asm/core.h>                             
  5                                                   
  6         .macro  do_addx2 dst, as, at, tmp         
  7 #if XCHAL_HAVE_ADDX                               
  8         addx2   \dst, \as, \at                    
  9 #else                                             
 10         slli    \tmp, \as, 1                      
 11         add     \dst, \tmp, \at                   
 12 #endif                                            
 13         .endm                                     
 14                                                   
 15         .macro  do_addx4 dst, as, at, tmp         
 16 #if XCHAL_HAVE_ADDX                               
 17         addx4   \dst, \as, \at                    
 18 #else                                             
 19         slli    \tmp, \as, 2                      
 20         add     \dst, \tmp, \at                   
 21 #endif                                            
 22         .endm                                     
 23                                                   
 24         .macro  do_addx8 dst, as, at, tmp         
 25 #if XCHAL_HAVE_ADDX                               
 26         addx8   \dst, \as, \at                    
 27 #else                                             
 28         slli    \tmp, \as, 3                      
 29         add     \dst, \tmp, \at                   
 30 #endif                                            
 31         .endm                                     
 32                                                   
 33 ENTRY(__mulsi3)                                   
 34                                                   
 35         abi_entry_default                         
 36                                                   
 37 #if XCHAL_HAVE_MUL32                              
 38         mull    a2, a2, a3                        
 39                                                   
 40 #elif XCHAL_HAVE_MUL16                            
 41         or      a4, a2, a3                        
 42         srai    a4, a4, 16                        
 43         bnez    a4, .LMUL16                       
 44         mul16u  a2, a2, a3                        
 45         abi_ret_default                           
 46 .LMUL16:                                          
 47         srai    a4, a2, 16                        
 48         srai    a5, a3, 16                        
 49         mul16u  a7, a4, a3                        
 50         mul16u  a6, a5, a2                        
 51         mul16u  a4, a2, a3                        
 52         add     a7, a7, a6                        
 53         slli    a7, a7, 16                        
 54         add     a2, a7, a4                        
 55                                                   
 56 #elif XCHAL_HAVE_MAC16                            
 57         mul.aa.hl a2, a3                          
 58         mula.aa.lh a2, a3                         
 59         rsr     a5, ACCLO                         
 60         umul.aa.ll a2, a3                         
 61         rsr     a4, ACCLO                         
 62         slli    a5, a5, 16                        
 63         add     a2, a4, a5                        
 64                                                   
 65 #else /* !MUL32 && !MUL16 && !MAC16 */            
 66                                                   
 67         /* Multiply one bit at a time, but unr    
 68            exploit the addx instructions and a    
 69            Peel the first iteration to save a     
 70                                                   
 71         /* Avoid negative numbers.  */            
 72         xor     a5, a2, a3      /* Top bit is     
 73         do_abs  a3, a3, a6                        
 74         do_abs  a2, a2, a6                        
 75                                                   
 76         /* Swap so the second argument is smal    
 77         sub     a7, a2, a3                        
 78         mov     a4, a3                            
 79         movgez  a4, a2, a7      /* a4 = max (a    
 80         movltz  a3, a2, a7      /* a3 = min (a    
 81                                                   
 82         movi    a2, 0                             
 83         extui   a6, a3, 0, 1                      
 84         movnez  a2, a4, a6                        
 85                                                   
 86         do_addx2 a7, a4, a2, a7                   
 87         extui   a6, a3, 1, 1                      
 88         movnez  a2, a7, a6                        
 89                                                   
 90         do_addx4 a7, a4, a2, a7                   
 91         extui   a6, a3, 2, 1                      
 92         movnez  a2, a7, a6                        
 93                                                   
 94         do_addx8 a7, a4, a2, a7                   
 95         extui   a6, a3, 3, 1                      
 96         movnez  a2, a7, a6                        
 97                                                   
 98         bgeui   a3, 16, .Lmult_main_loop          
 99         neg     a3, a2                            
100         movltz  a2, a3, a5                        
101         abi_ret_default                           
102                                                   
103         .align  4                                 
104 .Lmult_main_loop:                                 
105         srli    a3, a3, 4                         
106         slli    a4, a4, 4                         
107                                                   
108         add     a7, a4, a2                        
109         extui   a6, a3, 0, 1                      
110         movnez  a2, a7, a6                        
111                                                   
112         do_addx2 a7, a4, a2, a7                   
113         extui   a6, a3, 1, 1                      
114         movnez  a2, a7, a6                        
115                                                   
116         do_addx4 a7, a4, a2, a7                   
117         extui   a6, a3, 2, 1                      
118         movnez  a2, a7, a6                        
119                                                   
120         do_addx8 a7, a4, a2, a7                   
121         extui   a6, a3, 3, 1                      
122         movnez  a2, a7, a6                        
123                                                   
124         bgeui   a3, 16, .Lmult_main_loop          
125                                                   
126         neg     a3, a2                            
127         movltz  a2, a3, a5                        
128                                                   
129 #endif /* !MUL32 && !MUL16 && !MAC16 */           
130                                                   
131         abi_ret_default                           
132                                                   
133 ENDPROC(__mulsi3)                                 
134 EXPORT_SYMBOL(__mulsi3)                           
                                                      

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