e_asinl.s

Glibc 2.3.2源代码(解压后有100多M)

(p8)  br.ret.spnt   b0 ;;                                          
}

// case 3: 2^-2  <= |x| < 1    
// 1- X*X is computed as B + b
// Step 1.1:     Get B and b

// atan2 will return
//   f8  = Z_hi
//   f10 = Z_lo
//   f11 = s_lo


{ .mfi
(p0)  mov            asin_GR_fffe = 0xfffe                      
(p0)   fmerge.se f8 = asin_ABS_NORM_f8, asin_ABS_NORM_f8                                   
nop.i 0
};;

{ .mmf
nop.m 0
(p0)   setf.exp       asin_HALF = asin_GR_fffe                   
(p0)   fmerge.se f12 = asin_NORM_f8, asin_NORM_f8 ;;                         
}


{ .mfi
      nop.m 999
(p0)  fcmp.lt.unc.s1 p6,p7 = asin_ABS_NORM_f8, asin_HALF        
      nop.i 999 ;;
}

{ .mfi
      nop.m 999
(p7)  fma.s1         asin_D   = f1,f1,asin_ABS_NORM_f8          
      nop.i 999
}

{ .mfi
      nop.m 999
(p7)  fms.s1         asin_C   = f1,f1,asin_ABS_NORM_f8          
      nop.i 999 ;;
}

{ .mfi
      nop.m 999
(p7)  fma.s1         asin_B   = asin_C, asin_D, f0              
      nop.i 999
}

{ .mfi
      nop.m 999
(p7)  fms.s1         asin_1mD = f1,f1,asin_D                    
      nop.i 999 ;;
}

{ .mfi
      nop.m 999
(p7)  fma.s1         asin_Dd  = asin_1mD,f1, asin_ABS_NORM_f8   
      nop.i 999
}

{ .mfi
      nop.m 999
(p7)  fms.s1         asin_Bb  = asin_C, asin_D, asin_B          
      nop.i 999 ;;
}

{ .mfi
      nop.m 999
(p7)  fma.s1         asin_Bb  = asin_C, asin_Dd, asin_Bb        
      nop.i 999
}

{ .mfi
      nop.m 999
(p6)  fma.s1         asin_C   = asin_ABS_NORM_f8, asin_ABS_NORM_f8, f0     
      nop.i 999 ;;
}

{ .mfi
      nop.m 999
(p6)  fms.s1         asin_B   = f1, f1, asin_C                             
      nop.i 999
}

{ .mfi
      nop.m 999
(p6)  fms.s1         asin_Cc  = asin_ABS_NORM_f8, asin_ABS_NORM_f8, asin_C 
      nop.i 999 ;;
}

{ .mfi
      nop.m 999
(p0)  fma.s1         asin_Hh     = asin_HALF, asin_B, f0                   
      nop.i 999
}

{ .mfi
      nop.m 999
(p6)  fms.s1         asin_1mB = f1, f1, asin_B                             
      nop.i 999 ;;
}

// Step 1.2: 
// sqrt(B + b) is computed as W + w
// Get W

{ .mfi
      nop.m 999
(p0)  frsqrta.s1     asin_y0,p8  = asin_B                                  
      nop.i 999 ;;
}

{ .mfi
      nop.m 999
(p6)  fms.s1         asin_1mBmC = asin_1mB, f1, asin_C                     
      nop.i 999 ;;
}

{ .mfi
      nop.m 999
(p0)  fma.s1         asin_t1     = asin_y0, asin_y0, f0                    
      nop.i 999 ;;
}

{ .mfi
      nop.m 999
(p6)  fms.s1         asin_Bb  = asin_1mBmC, f1, asin_Cc                    
      nop.i 999 ;;
}

{ .mfi
      nop.m 999
(p0)  fnma.s1        asin_t2     = asin_t1, asin_Hh, asin_HALF             
      nop.i 999 ;;
}

{ .mfi
      nop.m 999
(p0)  fma.s1         asin_y1     = asin_t2, asin_y0, asin_y0               
      nop.i 999 ;;
}

{ .mfi
      nop.m 999
(p0)  fma.s1         asin_t3     = asin_y1, asin_Hh, f0                    
      nop.i 999 ;;
}

{ .mfi
      nop.m 999
(p0)  fnma.s1        asin_t4     = asin_t3, asin_y1, asin_HALF             
      nop.i 999 ;;
}

{ .mfi
      nop.m 999
(p0)  fma.s1         asin_y2     = asin_t4, asin_y1, asin_y1               
      nop.i 999 ;;
}

{ .mfi
      nop.m 999
(p0)  fma.s1         asin_S      = asin_B, asin_y2, f0                     
      nop.i 999
}

{ .mfi
      nop.m 999
(p0)  fma.s1         asin_H      = asin_y2, asin_HALF, f0                  
      nop.i 999 ;;
}

{ .mfi
      nop.m 999
(p0)  fma.s1         asin_t5     = asin_Hh, asin_y2, f0                    
      nop.i 999 ;;
}

{ .mfi
      nop.m 999
(p0)  fnma.s1        asin_Dd     = asin_S, asin_S, asin_B                  
      nop.i 999 ;;
}

{ .mfi
      nop.m 999
(p0)  fma.s1         asin_W      = asin_Dd, asin_H, asin_S                 
      nop.i 999 ;;
}

{ .mfi
      nop.m 999
(p0)  fma.s1         asin_2W       = asin_W, f1, asin_W                    
      nop.i 999
}

// Step 1.3
// Get w
{ .mfi
      nop.m 999
(p0)  fnma.s1        asin_BmWW     = asin_W, asin_W, asin_B                
      nop.i 999 ;;
}

// Step 2
// asin(x) = atan2(X,sqrt(1-X*X))
//         = atan2(X, W) -Xw
// corr = Xw
// asin(x) = Z_hi + (s_lo*Z_lo - corr)
// Call atan2(X, W)
// Save W in f9 
// Save X in f12 
// Save w in f13

{ .mfi
      nop.m 999
(p0)   fmerge.se f9 = asin_W, asin_W                                      
      nop.i 999 ;;
}

{ .mfi
      nop.m 999
(p0)  fma.s1         asin_BmWWpb   = asin_BmWW, f1, asin_Bb                
      nop.i 999 ;;
}

{ .mfi
      nop.m 999
(p0)  frcpa.s1       asin_1d2W,p9  = f1, asin_2W                           
      nop.i 999 ;;
}

{ .mfi
      nop.m 999
(p0)  fma.s1         asin_Ww       = asin_BmWWpb, asin_1d2W, f0            
      nop.i 999 ;;
}
.endp asinl
ASM_SIZE_DIRECTIVE(asinl)

.proc __libm_callout
__libm_callout:
.prologue
{ .mfi
        nop.m 0
        nop.f 0
.save   ar.pfs,GR_SAVE_PFS
        mov  GR_SAVE_PFS=ar.pfs                 // Save ar.pfs
};;
{ .mfi
        mov GR_SAVE_GP=gp                       // Save gp
        nop.f 0
.save   b0, GR_SAVE_B0
        mov GR_SAVE_B0=b0                       // Save b0
}
.body
{.mfb
        nop.m 0
(p0)    fmerge.se f13 = asin_Ww, asin_Ww                                   
(p0)    br.call.sptk.many  b0=__libm_atan2_reg#                  
};;
{ .mfi
        mov   gp = GR_SAVE_GP                  // Restore gp
(p0)    fma.s1  asin_XWw  = asin_ABS_NORM_f8,f13,f0             
        mov   b0 = GR_SAVE_B0                  // Restore return address
};;
// asin_XWw = Xw = corr
// asin_low = (s_lo * Z_lo - corr)
// f8       = Z_hi + (s_lo * Z_lo - corr)

{ .mfi
        nop.m 999
(p0)    fms.s1  asin_low  = f11, f10, asin_XWw                                
        mov   ar.pfs = GR_SAVE_PFS             // Restore ar.pfs
};;

{ .mfi
      nop.m 999
(p0)   fma.s0  f8        = f8, f1, asin_low                                
      nop.i 999 ;;
}

{ .mfb
      nop.m 999
(p0)   fmerge.s f8 = f12,f8 
(p0)  br.ret.sptk   b0 ;;                                                    
}
.endp __libm_callout
ASM_SIZE_DIRECTIVE(__libm_callout)

.proc SPECIAL
SPECIAL:
L(ASIN_ERROR_RETURN): 

// If X is 1, return (sign of X)pi/2

{ .mfi
      nop.m 999
(p0)  fcmp.eq.unc p6,p7 = asin_ABS_NORM_f8,f1   
      nop.i 999 ;;
}

{ .mfb
(p6) ldfe          asin_pi_by_2_lo  = [r40] 
(p6) fmerge.s      asin_pi_by_2 = f8,asin_pi_by_2          
     nop.b 0;;
}

// If X is a NAN, leave
// qnan snan inf norm     unorm 0 -+
// 1    1    0   0        0     0 11
{ .mfb
      nop.m 999
(p6)  fma.s0     f8 = f8,asin_pi_by_2_lo,asin_pi_by_2              
(p6)  br.ret.spnt   b0                           
}
{ .mfi
      nop.m 999
(p0)  fclass.m.unc p12,p0 = f8, 0xc3            
      nop.i 999 ;;
}

{ .mfb
      nop.m 999
(p12) fma.s0 f8 = f8,f1,f0                       
(p12) br.ret.spnt   b0 ;;                          
}
{ .mfi
(p0)   mov   GR_Parameter_TAG = 60                   
(p0)   frcpa f10, p6 = f0, f0                   
nop.i 0
};;
.endp SPECIAL
ASM_SIZE_DIRECTIVE(SPECIAL)

.proc __libm_error_region
__libm_error_region:
.prologue
{ .mfi
        add   GR_Parameter_Y=-32,sp             // Parameter 2 value
        nop.f 0
.save   ar.pfs,GR_SAVE_PFS
        mov  GR_SAVE_PFS=ar.pfs                 // Save ar.pfs
}
{ .mfi
.fframe 64
        add sp=-64,sp                           // Create new stack
        nop.f 0
        mov GR_SAVE_GP=gp                       // Save gp
};;
{ .mmi
        stfe [GR_Parameter_Y] = FR_Y,16         // Store Parameter 2 on stack
        add GR_Parameter_X = 16,sp              // Parameter 1 address
.save   b0, GR_SAVE_B0
        mov GR_SAVE_B0=b0                       // Save b0
};;
.body
{ .mib
        stfe [GR_Parameter_X] = FR_X            // Store Parameter 1 on stack
        add   GR_Parameter_RESULT = 0,GR_Parameter_Y
        nop.b 0                                 // Parameter 3 address
}
{ .mib
        stfe [GR_Parameter_Y] = FR_RESULT       // Store Parameter 3 on stack
        add   GR_Parameter_Y = -16,GR_Parameter_Y
        br.call.sptk b0=__libm_error_support#   // Call error handling function
};;
{ .mmi
        nop.m 0
        nop.m 0
        add   GR_Parameter_RESULT = 48,sp
};;
{ .mmi
        ldfe  f8 = [GR_Parameter_RESULT]       // Get return result off stack
.restore sp
        add   sp = 64,sp                       // Restore stack pointer
        mov   b0 = GR_SAVE_B0                  // Restore return address
};;
{ .mib
        mov   gp = GR_SAVE_GP                  // Restore gp 
        mov   ar.pfs = GR_SAVE_PFS             // Restore ar.pfs
        br.ret.sptk     b0                     // Return
};; 

.endp __libm_error_region
ASM_SIZE_DIRECTIVE(__libm_error_region)

.type   __libm_error_support#,@function
.global __libm_error_support#

.type   __libm_atan2_reg#,@function
.global __libm_atan2_reg#