Adam Langley | fad6327 | 2015-11-12 12:15:39 -0800 | [diff] [blame] | 1 | .text |
| 2 | |
Robert Sloan | 8ff0355 | 2017-06-14 12:40:58 -0700 | [diff] [blame^] | 3 | .globl _bn_mul_mont |
| 4 | .private_extern _bn_mul_mont |
| 5 | |
Adam Langley | fad6327 | 2015-11-12 12:15:39 -0800 | [diff] [blame] | 6 | .align 5 |
Robert Sloan | 8ff0355 | 2017-06-14 12:40:58 -0700 | [diff] [blame^] | 7 | _bn_mul_mont: |
Adam Langley | fad6327 | 2015-11-12 12:15:39 -0800 | [diff] [blame] | 8 | tst x5,#7 |
| 9 | b.eq __bn_sqr8x_mont |
| 10 | tst x5,#3 |
| 11 | b.eq __bn_mul4x_mont |
Robert Sloan | 8ff0355 | 2017-06-14 12:40:58 -0700 | [diff] [blame^] | 12 | Lmul_mont: |
Adam Langley | fad6327 | 2015-11-12 12:15:39 -0800 | [diff] [blame] | 13 | stp x29,x30,[sp,#-64]! |
| 14 | add x29,sp,#0 |
| 15 | stp x19,x20,[sp,#16] |
| 16 | stp x21,x22,[sp,#32] |
| 17 | stp x23,x24,[sp,#48] |
| 18 | |
| 19 | ldr x9,[x2],#8 // bp[0] |
| 20 | sub x22,sp,x5,lsl#3 |
| 21 | ldp x7,x8,[x1],#16 // ap[0..1] |
| 22 | lsl x5,x5,#3 |
| 23 | ldr x4,[x4] // *n0 |
| 24 | and x22,x22,#-16 // ABI says so |
| 25 | ldp x13,x14,[x3],#16 // np[0..1] |
| 26 | |
| 27 | mul x6,x7,x9 // ap[0]*bp[0] |
| 28 | sub x21,x5,#16 // j=num-2 |
| 29 | umulh x7,x7,x9 |
| 30 | mul x10,x8,x9 // ap[1]*bp[0] |
| 31 | umulh x11,x8,x9 |
| 32 | |
| 33 | mul x15,x6,x4 // "tp[0]"*n0 |
| 34 | mov sp,x22 // alloca |
| 35 | |
| 36 | // (*) mul x12,x13,x15 // np[0]*m1 |
| 37 | umulh x13,x13,x15 |
| 38 | mul x16,x14,x15 // np[1]*m1 |
| 39 | // (*) adds x12,x12,x6 // discarded |
| 40 | // (*) As for removal of first multiplication and addition |
| 41 | // instructions. The outcome of first addition is |
| 42 | // guaranteed to be zero, which leaves two computationally |
| 43 | // significant outcomes: it either carries or not. Then |
| 44 | // question is when does it carry? Is there alternative |
| 45 | // way to deduce it? If you follow operations, you can |
| 46 | // observe that condition for carry is quite simple: |
| 47 | // x6 being non-zero. So that carry can be calculated |
| 48 | // by adding -1 to x6. That's what next instruction does. |
| 49 | subs xzr,x6,#1 // (*) |
| 50 | umulh x17,x14,x15 |
| 51 | adc x13,x13,xzr |
Robert Sloan | 8ff0355 | 2017-06-14 12:40:58 -0700 | [diff] [blame^] | 52 | cbz x21,L1st_skip |
Adam Langley | fad6327 | 2015-11-12 12:15:39 -0800 | [diff] [blame] | 53 | |
Robert Sloan | 8ff0355 | 2017-06-14 12:40:58 -0700 | [diff] [blame^] | 54 | L1st: |
Adam Langley | fad6327 | 2015-11-12 12:15:39 -0800 | [diff] [blame] | 55 | ldr x8,[x1],#8 |
| 56 | adds x6,x10,x7 |
| 57 | sub x21,x21,#8 // j-- |
| 58 | adc x7,x11,xzr |
| 59 | |
| 60 | ldr x14,[x3],#8 |
| 61 | adds x12,x16,x13 |
| 62 | mul x10,x8,x9 // ap[j]*bp[0] |
| 63 | adc x13,x17,xzr |
| 64 | umulh x11,x8,x9 |
| 65 | |
| 66 | adds x12,x12,x6 |
| 67 | mul x16,x14,x15 // np[j]*m1 |
| 68 | adc x13,x13,xzr |
| 69 | umulh x17,x14,x15 |
| 70 | str x12,[x22],#8 // tp[j-1] |
Robert Sloan | 8ff0355 | 2017-06-14 12:40:58 -0700 | [diff] [blame^] | 71 | cbnz x21,L1st |
Adam Langley | fad6327 | 2015-11-12 12:15:39 -0800 | [diff] [blame] | 72 | |
Robert Sloan | 8ff0355 | 2017-06-14 12:40:58 -0700 | [diff] [blame^] | 73 | L1st_skip: |
Adam Langley | fad6327 | 2015-11-12 12:15:39 -0800 | [diff] [blame] | 74 | adds x6,x10,x7 |
| 75 | sub x1,x1,x5 // rewind x1 |
| 76 | adc x7,x11,xzr |
| 77 | |
| 78 | adds x12,x16,x13 |
| 79 | sub x3,x3,x5 // rewind x3 |
| 80 | adc x13,x17,xzr |
| 81 | |
| 82 | adds x12,x12,x6 |
| 83 | sub x20,x5,#8 // i=num-1 |
| 84 | adcs x13,x13,x7 |
| 85 | |
| 86 | adc x19,xzr,xzr // upmost overflow bit |
| 87 | stp x12,x13,[x22] |
| 88 | |
Robert Sloan | 8ff0355 | 2017-06-14 12:40:58 -0700 | [diff] [blame^] | 89 | Louter: |
Adam Langley | fad6327 | 2015-11-12 12:15:39 -0800 | [diff] [blame] | 90 | ldr x9,[x2],#8 // bp[i] |
| 91 | ldp x7,x8,[x1],#16 |
| 92 | ldr x23,[sp] // tp[0] |
| 93 | add x22,sp,#8 |
| 94 | |
| 95 | mul x6,x7,x9 // ap[0]*bp[i] |
| 96 | sub x21,x5,#16 // j=num-2 |
| 97 | umulh x7,x7,x9 |
| 98 | ldp x13,x14,[x3],#16 |
| 99 | mul x10,x8,x9 // ap[1]*bp[i] |
| 100 | adds x6,x6,x23 |
| 101 | umulh x11,x8,x9 |
| 102 | adc x7,x7,xzr |
| 103 | |
| 104 | mul x15,x6,x4 |
| 105 | sub x20,x20,#8 // i-- |
| 106 | |
| 107 | // (*) mul x12,x13,x15 // np[0]*m1 |
| 108 | umulh x13,x13,x15 |
| 109 | mul x16,x14,x15 // np[1]*m1 |
| 110 | // (*) adds x12,x12,x6 |
| 111 | subs xzr,x6,#1 // (*) |
| 112 | umulh x17,x14,x15 |
Robert Sloan | 8ff0355 | 2017-06-14 12:40:58 -0700 | [diff] [blame^] | 113 | cbz x21,Linner_skip |
Adam Langley | fad6327 | 2015-11-12 12:15:39 -0800 | [diff] [blame] | 114 | |
Robert Sloan | 8ff0355 | 2017-06-14 12:40:58 -0700 | [diff] [blame^] | 115 | Linner: |
Adam Langley | fad6327 | 2015-11-12 12:15:39 -0800 | [diff] [blame] | 116 | ldr x8,[x1],#8 |
| 117 | adc x13,x13,xzr |
| 118 | ldr x23,[x22],#8 // tp[j] |
| 119 | adds x6,x10,x7 |
| 120 | sub x21,x21,#8 // j-- |
| 121 | adc x7,x11,xzr |
| 122 | |
| 123 | adds x12,x16,x13 |
| 124 | ldr x14,[x3],#8 |
| 125 | adc x13,x17,xzr |
| 126 | |
| 127 | mul x10,x8,x9 // ap[j]*bp[i] |
| 128 | adds x6,x6,x23 |
| 129 | umulh x11,x8,x9 |
| 130 | adc x7,x7,xzr |
| 131 | |
| 132 | mul x16,x14,x15 // np[j]*m1 |
| 133 | adds x12,x12,x6 |
| 134 | umulh x17,x14,x15 |
| 135 | str x12,[x22,#-16] // tp[j-1] |
Robert Sloan | 8ff0355 | 2017-06-14 12:40:58 -0700 | [diff] [blame^] | 136 | cbnz x21,Linner |
Adam Langley | fad6327 | 2015-11-12 12:15:39 -0800 | [diff] [blame] | 137 | |
Robert Sloan | 8ff0355 | 2017-06-14 12:40:58 -0700 | [diff] [blame^] | 138 | Linner_skip: |
Adam Langley | fad6327 | 2015-11-12 12:15:39 -0800 | [diff] [blame] | 139 | ldr x23,[x22],#8 // tp[j] |
| 140 | adc x13,x13,xzr |
| 141 | adds x6,x10,x7 |
| 142 | sub x1,x1,x5 // rewind x1 |
| 143 | adc x7,x11,xzr |
| 144 | |
| 145 | adds x12,x16,x13 |
| 146 | sub x3,x3,x5 // rewind x3 |
| 147 | adcs x13,x17,x19 |
| 148 | adc x19,xzr,xzr |
| 149 | |
| 150 | adds x6,x6,x23 |
| 151 | adc x7,x7,xzr |
| 152 | |
| 153 | adds x12,x12,x6 |
| 154 | adcs x13,x13,x7 |
| 155 | adc x19,x19,xzr // upmost overflow bit |
| 156 | stp x12,x13,[x22,#-16] |
| 157 | |
Robert Sloan | 8ff0355 | 2017-06-14 12:40:58 -0700 | [diff] [blame^] | 158 | cbnz x20,Louter |
Adam Langley | fad6327 | 2015-11-12 12:15:39 -0800 | [diff] [blame] | 159 | |
| 160 | // Final step. We see if result is larger than modulus, and |
| 161 | // if it is, subtract the modulus. But comparison implies |
| 162 | // subtraction. So we subtract modulus, see if it borrowed, |
| 163 | // and conditionally copy original value. |
| 164 | ldr x23,[sp] // tp[0] |
| 165 | add x22,sp,#8 |
| 166 | ldr x14,[x3],#8 // np[0] |
| 167 | subs x21,x5,#8 // j=num-1 and clear borrow |
| 168 | mov x1,x0 |
Robert Sloan | 8ff0355 | 2017-06-14 12:40:58 -0700 | [diff] [blame^] | 169 | Lsub: |
Adam Langley | fad6327 | 2015-11-12 12:15:39 -0800 | [diff] [blame] | 170 | sbcs x8,x23,x14 // tp[j]-np[j] |
| 171 | ldr x23,[x22],#8 |
| 172 | sub x21,x21,#8 // j-- |
| 173 | ldr x14,[x3],#8 |
| 174 | str x8,[x1],#8 // rp[j]=tp[j]-np[j] |
Robert Sloan | 8ff0355 | 2017-06-14 12:40:58 -0700 | [diff] [blame^] | 175 | cbnz x21,Lsub |
Adam Langley | fad6327 | 2015-11-12 12:15:39 -0800 | [diff] [blame] | 176 | |
| 177 | sbcs x8,x23,x14 |
| 178 | sbcs x19,x19,xzr // did it borrow? |
| 179 | str x8,[x1],#8 // rp[num-1] |
| 180 | |
| 181 | ldr x23,[sp] // tp[0] |
| 182 | add x22,sp,#8 |
| 183 | ldr x8,[x0],#8 // rp[0] |
| 184 | sub x5,x5,#8 // num-- |
| 185 | nop |
Robert Sloan | 8ff0355 | 2017-06-14 12:40:58 -0700 | [diff] [blame^] | 186 | Lcond_copy: |
Adam Langley | fad6327 | 2015-11-12 12:15:39 -0800 | [diff] [blame] | 187 | sub x5,x5,#8 // num-- |
| 188 | csel x14,x23,x8,lo // did it borrow? |
| 189 | ldr x23,[x22],#8 |
| 190 | ldr x8,[x0],#8 |
| 191 | str xzr,[x22,#-16] // wipe tp |
| 192 | str x14,[x0,#-16] |
Robert Sloan | 8ff0355 | 2017-06-14 12:40:58 -0700 | [diff] [blame^] | 193 | cbnz x5,Lcond_copy |
Adam Langley | fad6327 | 2015-11-12 12:15:39 -0800 | [diff] [blame] | 194 | |
| 195 | csel x14,x23,x8,lo |
| 196 | str xzr,[x22,#-8] // wipe tp |
| 197 | str x14,[x0,#-8] |
| 198 | |
| 199 | ldp x19,x20,[x29,#16] |
| 200 | mov sp,x29 |
| 201 | ldp x21,x22,[x29,#32] |
| 202 | mov x0,#1 |
| 203 | ldp x23,x24,[x29,#48] |
| 204 | ldr x29,[sp],#64 |
| 205 | ret |
Robert Sloan | 8ff0355 | 2017-06-14 12:40:58 -0700 | [diff] [blame^] | 206 | |
| 207 | |
Adam Langley | fad6327 | 2015-11-12 12:15:39 -0800 | [diff] [blame] | 208 | .align 5 |
| 209 | __bn_sqr8x_mont: |
| 210 | cmp x1,x2 |
| 211 | b.ne __bn_mul4x_mont |
Robert Sloan | 8ff0355 | 2017-06-14 12:40:58 -0700 | [diff] [blame^] | 212 | Lsqr8x_mont: |
Adam Langley | fad6327 | 2015-11-12 12:15:39 -0800 | [diff] [blame] | 213 | stp x29,x30,[sp,#-128]! |
| 214 | add x29,sp,#0 |
| 215 | stp x19,x20,[sp,#16] |
| 216 | stp x21,x22,[sp,#32] |
| 217 | stp x23,x24,[sp,#48] |
| 218 | stp x25,x26,[sp,#64] |
| 219 | stp x27,x28,[sp,#80] |
| 220 | stp x0,x3,[sp,#96] // offload rp and np |
| 221 | |
| 222 | ldp x6,x7,[x1,#8*0] |
| 223 | ldp x8,x9,[x1,#8*2] |
| 224 | ldp x10,x11,[x1,#8*4] |
| 225 | ldp x12,x13,[x1,#8*6] |
| 226 | |
| 227 | sub x2,sp,x5,lsl#4 |
| 228 | lsl x5,x5,#3 |
| 229 | ldr x4,[x4] // *n0 |
| 230 | mov sp,x2 // alloca |
| 231 | sub x27,x5,#8*8 |
Robert Sloan | 8ff0355 | 2017-06-14 12:40:58 -0700 | [diff] [blame^] | 232 | b Lsqr8x_zero_start |
Adam Langley | fad6327 | 2015-11-12 12:15:39 -0800 | [diff] [blame] | 233 | |
Robert Sloan | 8ff0355 | 2017-06-14 12:40:58 -0700 | [diff] [blame^] | 234 | Lsqr8x_zero: |
Adam Langley | fad6327 | 2015-11-12 12:15:39 -0800 | [diff] [blame] | 235 | sub x27,x27,#8*8 |
| 236 | stp xzr,xzr,[x2,#8*0] |
| 237 | stp xzr,xzr,[x2,#8*2] |
| 238 | stp xzr,xzr,[x2,#8*4] |
| 239 | stp xzr,xzr,[x2,#8*6] |
Robert Sloan | 8ff0355 | 2017-06-14 12:40:58 -0700 | [diff] [blame^] | 240 | Lsqr8x_zero_start: |
Adam Langley | fad6327 | 2015-11-12 12:15:39 -0800 | [diff] [blame] | 241 | stp xzr,xzr,[x2,#8*8] |
| 242 | stp xzr,xzr,[x2,#8*10] |
| 243 | stp xzr,xzr,[x2,#8*12] |
| 244 | stp xzr,xzr,[x2,#8*14] |
| 245 | add x2,x2,#8*16 |
Robert Sloan | 8ff0355 | 2017-06-14 12:40:58 -0700 | [diff] [blame^] | 246 | cbnz x27,Lsqr8x_zero |
Adam Langley | fad6327 | 2015-11-12 12:15:39 -0800 | [diff] [blame] | 247 | |
| 248 | add x3,x1,x5 |
| 249 | add x1,x1,#8*8 |
| 250 | mov x19,xzr |
| 251 | mov x20,xzr |
| 252 | mov x21,xzr |
| 253 | mov x22,xzr |
| 254 | mov x23,xzr |
| 255 | mov x24,xzr |
| 256 | mov x25,xzr |
| 257 | mov x26,xzr |
| 258 | mov x2,sp |
| 259 | str x4,[x29,#112] // offload n0 |
| 260 | |
| 261 | // Multiply everything but a[i]*a[i] |
| 262 | .align 4 |
Robert Sloan | 8ff0355 | 2017-06-14 12:40:58 -0700 | [diff] [blame^] | 263 | Lsqr8x_outer_loop: |
Adam Langley | fad6327 | 2015-11-12 12:15:39 -0800 | [diff] [blame] | 264 | // a[1]a[0] (i) |
| 265 | // a[2]a[0] |
| 266 | // a[3]a[0] |
| 267 | // a[4]a[0] |
| 268 | // a[5]a[0] |
| 269 | // a[6]a[0] |
| 270 | // a[7]a[0] |
| 271 | // a[2]a[1] (ii) |
| 272 | // a[3]a[1] |
| 273 | // a[4]a[1] |
| 274 | // a[5]a[1] |
| 275 | // a[6]a[1] |
| 276 | // a[7]a[1] |
| 277 | // a[3]a[2] (iii) |
| 278 | // a[4]a[2] |
| 279 | // a[5]a[2] |
| 280 | // a[6]a[2] |
| 281 | // a[7]a[2] |
| 282 | // a[4]a[3] (iv) |
| 283 | // a[5]a[3] |
| 284 | // a[6]a[3] |
| 285 | // a[7]a[3] |
| 286 | // a[5]a[4] (v) |
| 287 | // a[6]a[4] |
| 288 | // a[7]a[4] |
| 289 | // a[6]a[5] (vi) |
| 290 | // a[7]a[5] |
| 291 | // a[7]a[6] (vii) |
| 292 | |
| 293 | mul x14,x7,x6 // lo(a[1..7]*a[0]) (i) |
| 294 | mul x15,x8,x6 |
| 295 | mul x16,x9,x6 |
| 296 | mul x17,x10,x6 |
| 297 | adds x20,x20,x14 // t[1]+lo(a[1]*a[0]) |
| 298 | mul x14,x11,x6 |
| 299 | adcs x21,x21,x15 |
| 300 | mul x15,x12,x6 |
| 301 | adcs x22,x22,x16 |
| 302 | mul x16,x13,x6 |
| 303 | adcs x23,x23,x17 |
| 304 | umulh x17,x7,x6 // hi(a[1..7]*a[0]) |
| 305 | adcs x24,x24,x14 |
| 306 | umulh x14,x8,x6 |
| 307 | adcs x25,x25,x15 |
| 308 | umulh x15,x9,x6 |
| 309 | adcs x26,x26,x16 |
| 310 | umulh x16,x10,x6 |
| 311 | stp x19,x20,[x2],#8*2 // t[0..1] |
| 312 | adc x19,xzr,xzr // t[8] |
| 313 | adds x21,x21,x17 // t[2]+lo(a[1]*a[0]) |
| 314 | umulh x17,x11,x6 |
| 315 | adcs x22,x22,x14 |
| 316 | umulh x14,x12,x6 |
| 317 | adcs x23,x23,x15 |
| 318 | umulh x15,x13,x6 |
| 319 | adcs x24,x24,x16 |
| 320 | mul x16,x8,x7 // lo(a[2..7]*a[1]) (ii) |
| 321 | adcs x25,x25,x17 |
| 322 | mul x17,x9,x7 |
| 323 | adcs x26,x26,x14 |
| 324 | mul x14,x10,x7 |
| 325 | adc x19,x19,x15 |
| 326 | |
| 327 | mul x15,x11,x7 |
| 328 | adds x22,x22,x16 |
| 329 | mul x16,x12,x7 |
| 330 | adcs x23,x23,x17 |
| 331 | mul x17,x13,x7 |
| 332 | adcs x24,x24,x14 |
| 333 | umulh x14,x8,x7 // hi(a[2..7]*a[1]) |
| 334 | adcs x25,x25,x15 |
| 335 | umulh x15,x9,x7 |
| 336 | adcs x26,x26,x16 |
| 337 | umulh x16,x10,x7 |
| 338 | adcs x19,x19,x17 |
| 339 | umulh x17,x11,x7 |
| 340 | stp x21,x22,[x2],#8*2 // t[2..3] |
| 341 | adc x20,xzr,xzr // t[9] |
| 342 | adds x23,x23,x14 |
| 343 | umulh x14,x12,x7 |
| 344 | adcs x24,x24,x15 |
| 345 | umulh x15,x13,x7 |
| 346 | adcs x25,x25,x16 |
| 347 | mul x16,x9,x8 // lo(a[3..7]*a[2]) (iii) |
| 348 | adcs x26,x26,x17 |
| 349 | mul x17,x10,x8 |
| 350 | adcs x19,x19,x14 |
| 351 | mul x14,x11,x8 |
| 352 | adc x20,x20,x15 |
| 353 | |
| 354 | mul x15,x12,x8 |
| 355 | adds x24,x24,x16 |
| 356 | mul x16,x13,x8 |
| 357 | adcs x25,x25,x17 |
| 358 | umulh x17,x9,x8 // hi(a[3..7]*a[2]) |
| 359 | adcs x26,x26,x14 |
| 360 | umulh x14,x10,x8 |
| 361 | adcs x19,x19,x15 |
| 362 | umulh x15,x11,x8 |
| 363 | adcs x20,x20,x16 |
| 364 | umulh x16,x12,x8 |
| 365 | stp x23,x24,[x2],#8*2 // t[4..5] |
| 366 | adc x21,xzr,xzr // t[10] |
| 367 | adds x25,x25,x17 |
| 368 | umulh x17,x13,x8 |
| 369 | adcs x26,x26,x14 |
| 370 | mul x14,x10,x9 // lo(a[4..7]*a[3]) (iv) |
| 371 | adcs x19,x19,x15 |
| 372 | mul x15,x11,x9 |
| 373 | adcs x20,x20,x16 |
| 374 | mul x16,x12,x9 |
| 375 | adc x21,x21,x17 |
| 376 | |
| 377 | mul x17,x13,x9 |
| 378 | adds x26,x26,x14 |
| 379 | umulh x14,x10,x9 // hi(a[4..7]*a[3]) |
| 380 | adcs x19,x19,x15 |
| 381 | umulh x15,x11,x9 |
| 382 | adcs x20,x20,x16 |
| 383 | umulh x16,x12,x9 |
| 384 | adcs x21,x21,x17 |
| 385 | umulh x17,x13,x9 |
| 386 | stp x25,x26,[x2],#8*2 // t[6..7] |
| 387 | adc x22,xzr,xzr // t[11] |
| 388 | adds x19,x19,x14 |
| 389 | mul x14,x11,x10 // lo(a[5..7]*a[4]) (v) |
| 390 | adcs x20,x20,x15 |
| 391 | mul x15,x12,x10 |
| 392 | adcs x21,x21,x16 |
| 393 | mul x16,x13,x10 |
| 394 | adc x22,x22,x17 |
| 395 | |
| 396 | umulh x17,x11,x10 // hi(a[5..7]*a[4]) |
| 397 | adds x20,x20,x14 |
| 398 | umulh x14,x12,x10 |
| 399 | adcs x21,x21,x15 |
| 400 | umulh x15,x13,x10 |
| 401 | adcs x22,x22,x16 |
| 402 | mul x16,x12,x11 // lo(a[6..7]*a[5]) (vi) |
| 403 | adc x23,xzr,xzr // t[12] |
| 404 | adds x21,x21,x17 |
| 405 | mul x17,x13,x11 |
| 406 | adcs x22,x22,x14 |
| 407 | umulh x14,x12,x11 // hi(a[6..7]*a[5]) |
| 408 | adc x23,x23,x15 |
| 409 | |
| 410 | umulh x15,x13,x11 |
| 411 | adds x22,x22,x16 |
| 412 | mul x16,x13,x12 // lo(a[7]*a[6]) (vii) |
| 413 | adcs x23,x23,x17 |
| 414 | umulh x17,x13,x12 // hi(a[7]*a[6]) |
| 415 | adc x24,xzr,xzr // t[13] |
| 416 | adds x23,x23,x14 |
| 417 | sub x27,x3,x1 // done yet? |
| 418 | adc x24,x24,x15 |
| 419 | |
| 420 | adds x24,x24,x16 |
| 421 | sub x14,x3,x5 // rewinded ap |
| 422 | adc x25,xzr,xzr // t[14] |
| 423 | add x25,x25,x17 |
| 424 | |
Robert Sloan | 8ff0355 | 2017-06-14 12:40:58 -0700 | [diff] [blame^] | 425 | cbz x27,Lsqr8x_outer_break |
Adam Langley | fad6327 | 2015-11-12 12:15:39 -0800 | [diff] [blame] | 426 | |
| 427 | mov x4,x6 |
| 428 | ldp x6,x7,[x2,#8*0] |
| 429 | ldp x8,x9,[x2,#8*2] |
| 430 | ldp x10,x11,[x2,#8*4] |
| 431 | ldp x12,x13,[x2,#8*6] |
| 432 | adds x19,x19,x6 |
| 433 | adcs x20,x20,x7 |
| 434 | ldp x6,x7,[x1,#8*0] |
| 435 | adcs x21,x21,x8 |
| 436 | adcs x22,x22,x9 |
| 437 | ldp x8,x9,[x1,#8*2] |
| 438 | adcs x23,x23,x10 |
| 439 | adcs x24,x24,x11 |
| 440 | ldp x10,x11,[x1,#8*4] |
| 441 | adcs x25,x25,x12 |
| 442 | mov x0,x1 |
| 443 | adcs x26,xzr,x13 |
| 444 | ldp x12,x13,[x1,#8*6] |
| 445 | add x1,x1,#8*8 |
| 446 | //adc x28,xzr,xzr // moved below |
| 447 | mov x27,#-8*8 |
| 448 | |
| 449 | // a[8]a[0] |
| 450 | // a[9]a[0] |
| 451 | // a[a]a[0] |
| 452 | // a[b]a[0] |
| 453 | // a[c]a[0] |
| 454 | // a[d]a[0] |
| 455 | // a[e]a[0] |
| 456 | // a[f]a[0] |
| 457 | // a[8]a[1] |
| 458 | // a[f]a[1]........................ |
| 459 | // a[8]a[2] |
| 460 | // a[f]a[2]........................ |
| 461 | // a[8]a[3] |
| 462 | // a[f]a[3]........................ |
| 463 | // a[8]a[4] |
| 464 | // a[f]a[4]........................ |
| 465 | // a[8]a[5] |
| 466 | // a[f]a[5]........................ |
| 467 | // a[8]a[6] |
| 468 | // a[f]a[6]........................ |
| 469 | // a[8]a[7] |
| 470 | // a[f]a[7]........................ |
Robert Sloan | 8ff0355 | 2017-06-14 12:40:58 -0700 | [diff] [blame^] | 471 | Lsqr8x_mul: |
Adam Langley | fad6327 | 2015-11-12 12:15:39 -0800 | [diff] [blame] | 472 | mul x14,x6,x4 |
| 473 | adc x28,xzr,xzr // carry bit, modulo-scheduled |
| 474 | mul x15,x7,x4 |
| 475 | add x27,x27,#8 |
| 476 | mul x16,x8,x4 |
| 477 | mul x17,x9,x4 |
| 478 | adds x19,x19,x14 |
| 479 | mul x14,x10,x4 |
| 480 | adcs x20,x20,x15 |
| 481 | mul x15,x11,x4 |
| 482 | adcs x21,x21,x16 |
| 483 | mul x16,x12,x4 |
| 484 | adcs x22,x22,x17 |
| 485 | mul x17,x13,x4 |
| 486 | adcs x23,x23,x14 |
| 487 | umulh x14,x6,x4 |
| 488 | adcs x24,x24,x15 |
| 489 | umulh x15,x7,x4 |
| 490 | adcs x25,x25,x16 |
| 491 | umulh x16,x8,x4 |
| 492 | adcs x26,x26,x17 |
| 493 | umulh x17,x9,x4 |
| 494 | adc x28,x28,xzr |
| 495 | str x19,[x2],#8 |
| 496 | adds x19,x20,x14 |
| 497 | umulh x14,x10,x4 |
| 498 | adcs x20,x21,x15 |
| 499 | umulh x15,x11,x4 |
| 500 | adcs x21,x22,x16 |
| 501 | umulh x16,x12,x4 |
| 502 | adcs x22,x23,x17 |
| 503 | umulh x17,x13,x4 |
| 504 | ldr x4,[x0,x27] |
| 505 | adcs x23,x24,x14 |
| 506 | adcs x24,x25,x15 |
| 507 | adcs x25,x26,x16 |
| 508 | adcs x26,x28,x17 |
| 509 | //adc x28,xzr,xzr // moved above |
Robert Sloan | 8ff0355 | 2017-06-14 12:40:58 -0700 | [diff] [blame^] | 510 | cbnz x27,Lsqr8x_mul |
Adam Langley | fad6327 | 2015-11-12 12:15:39 -0800 | [diff] [blame] | 511 | // note that carry flag is guaranteed |
| 512 | // to be zero at this point |
| 513 | cmp x1,x3 // done yet? |
Robert Sloan | 8ff0355 | 2017-06-14 12:40:58 -0700 | [diff] [blame^] | 514 | b.eq Lsqr8x_break |
Adam Langley | fad6327 | 2015-11-12 12:15:39 -0800 | [diff] [blame] | 515 | |
| 516 | ldp x6,x7,[x2,#8*0] |
| 517 | ldp x8,x9,[x2,#8*2] |
| 518 | ldp x10,x11,[x2,#8*4] |
| 519 | ldp x12,x13,[x2,#8*6] |
| 520 | adds x19,x19,x6 |
| 521 | ldr x4,[x0,#-8*8] |
| 522 | adcs x20,x20,x7 |
| 523 | ldp x6,x7,[x1,#8*0] |
| 524 | adcs x21,x21,x8 |
| 525 | adcs x22,x22,x9 |
| 526 | ldp x8,x9,[x1,#8*2] |
| 527 | adcs x23,x23,x10 |
| 528 | adcs x24,x24,x11 |
| 529 | ldp x10,x11,[x1,#8*4] |
| 530 | adcs x25,x25,x12 |
| 531 | mov x27,#-8*8 |
| 532 | adcs x26,x26,x13 |
| 533 | ldp x12,x13,[x1,#8*6] |
| 534 | add x1,x1,#8*8 |
| 535 | //adc x28,xzr,xzr // moved above |
Robert Sloan | 8ff0355 | 2017-06-14 12:40:58 -0700 | [diff] [blame^] | 536 | b Lsqr8x_mul |
Adam Langley | fad6327 | 2015-11-12 12:15:39 -0800 | [diff] [blame] | 537 | |
| 538 | .align 4 |
Robert Sloan | 8ff0355 | 2017-06-14 12:40:58 -0700 | [diff] [blame^] | 539 | Lsqr8x_break: |
Adam Langley | fad6327 | 2015-11-12 12:15:39 -0800 | [diff] [blame] | 540 | ldp x6,x7,[x0,#8*0] |
| 541 | add x1,x0,#8*8 |
| 542 | ldp x8,x9,[x0,#8*2] |
| 543 | sub x14,x3,x1 // is it last iteration? |
| 544 | ldp x10,x11,[x0,#8*4] |
| 545 | sub x15,x2,x14 |
| 546 | ldp x12,x13,[x0,#8*6] |
Robert Sloan | 8ff0355 | 2017-06-14 12:40:58 -0700 | [diff] [blame^] | 547 | cbz x14,Lsqr8x_outer_loop |
Adam Langley | fad6327 | 2015-11-12 12:15:39 -0800 | [diff] [blame] | 548 | |
| 549 | stp x19,x20,[x2,#8*0] |
| 550 | ldp x19,x20,[x15,#8*0] |
| 551 | stp x21,x22,[x2,#8*2] |
| 552 | ldp x21,x22,[x15,#8*2] |
| 553 | stp x23,x24,[x2,#8*4] |
| 554 | ldp x23,x24,[x15,#8*4] |
| 555 | stp x25,x26,[x2,#8*6] |
| 556 | mov x2,x15 |
| 557 | ldp x25,x26,[x15,#8*6] |
Robert Sloan | 8ff0355 | 2017-06-14 12:40:58 -0700 | [diff] [blame^] | 558 | b Lsqr8x_outer_loop |
Adam Langley | fad6327 | 2015-11-12 12:15:39 -0800 | [diff] [blame] | 559 | |
| 560 | .align 4 |
Robert Sloan | 8ff0355 | 2017-06-14 12:40:58 -0700 | [diff] [blame^] | 561 | Lsqr8x_outer_break: |
Adam Langley | fad6327 | 2015-11-12 12:15:39 -0800 | [diff] [blame] | 562 | // Now multiply above result by 2 and add a[n-1]*a[n-1]|...|a[0]*a[0] |
| 563 | ldp x7,x9,[x14,#8*0] // recall that x14 is &a[0] |
| 564 | ldp x15,x16,[sp,#8*1] |
| 565 | ldp x11,x13,[x14,#8*2] |
| 566 | add x1,x14,#8*4 |
| 567 | ldp x17,x14,[sp,#8*3] |
| 568 | |
| 569 | stp x19,x20,[x2,#8*0] |
| 570 | mul x19,x7,x7 |
| 571 | stp x21,x22,[x2,#8*2] |
| 572 | umulh x7,x7,x7 |
| 573 | stp x23,x24,[x2,#8*4] |
| 574 | mul x8,x9,x9 |
| 575 | stp x25,x26,[x2,#8*6] |
| 576 | mov x2,sp |
| 577 | umulh x9,x9,x9 |
| 578 | adds x20,x7,x15,lsl#1 |
| 579 | extr x15,x16,x15,#63 |
| 580 | sub x27,x5,#8*4 |
| 581 | |
Robert Sloan | 8ff0355 | 2017-06-14 12:40:58 -0700 | [diff] [blame^] | 582 | Lsqr4x_shift_n_add: |
Adam Langley | fad6327 | 2015-11-12 12:15:39 -0800 | [diff] [blame] | 583 | adcs x21,x8,x15 |
| 584 | extr x16,x17,x16,#63 |
| 585 | sub x27,x27,#8*4 |
| 586 | adcs x22,x9,x16 |
| 587 | ldp x15,x16,[x2,#8*5] |
| 588 | mul x10,x11,x11 |
| 589 | ldp x7,x9,[x1],#8*2 |
| 590 | umulh x11,x11,x11 |
| 591 | mul x12,x13,x13 |
| 592 | umulh x13,x13,x13 |
| 593 | extr x17,x14,x17,#63 |
| 594 | stp x19,x20,[x2,#8*0] |
| 595 | adcs x23,x10,x17 |
| 596 | extr x14,x15,x14,#63 |
| 597 | stp x21,x22,[x2,#8*2] |
| 598 | adcs x24,x11,x14 |
| 599 | ldp x17,x14,[x2,#8*7] |
| 600 | extr x15,x16,x15,#63 |
| 601 | adcs x25,x12,x15 |
| 602 | extr x16,x17,x16,#63 |
| 603 | adcs x26,x13,x16 |
| 604 | ldp x15,x16,[x2,#8*9] |
| 605 | mul x6,x7,x7 |
| 606 | ldp x11,x13,[x1],#8*2 |
| 607 | umulh x7,x7,x7 |
| 608 | mul x8,x9,x9 |
| 609 | umulh x9,x9,x9 |
| 610 | stp x23,x24,[x2,#8*4] |
| 611 | extr x17,x14,x17,#63 |
| 612 | stp x25,x26,[x2,#8*6] |
| 613 | add x2,x2,#8*8 |
| 614 | adcs x19,x6,x17 |
| 615 | extr x14,x15,x14,#63 |
| 616 | adcs x20,x7,x14 |
| 617 | ldp x17,x14,[x2,#8*3] |
| 618 | extr x15,x16,x15,#63 |
Robert Sloan | 8ff0355 | 2017-06-14 12:40:58 -0700 | [diff] [blame^] | 619 | cbnz x27,Lsqr4x_shift_n_add |
Adam Langley | fad6327 | 2015-11-12 12:15:39 -0800 | [diff] [blame] | 620 | ldp x1,x4,[x29,#104] // pull np and n0 |
| 621 | |
| 622 | adcs x21,x8,x15 |
| 623 | extr x16,x17,x16,#63 |
| 624 | adcs x22,x9,x16 |
| 625 | ldp x15,x16,[x2,#8*5] |
| 626 | mul x10,x11,x11 |
| 627 | umulh x11,x11,x11 |
| 628 | stp x19,x20,[x2,#8*0] |
| 629 | mul x12,x13,x13 |
| 630 | umulh x13,x13,x13 |
| 631 | stp x21,x22,[x2,#8*2] |
| 632 | extr x17,x14,x17,#63 |
| 633 | adcs x23,x10,x17 |
| 634 | extr x14,x15,x14,#63 |
| 635 | ldp x19,x20,[sp,#8*0] |
| 636 | adcs x24,x11,x14 |
| 637 | extr x15,x16,x15,#63 |
| 638 | ldp x6,x7,[x1,#8*0] |
| 639 | adcs x25,x12,x15 |
| 640 | extr x16,xzr,x16,#63 |
| 641 | ldp x8,x9,[x1,#8*2] |
| 642 | adc x26,x13,x16 |
| 643 | ldp x10,x11,[x1,#8*4] |
| 644 | |
| 645 | // Reduce by 512 bits per iteration |
| 646 | mul x28,x4,x19 // t[0]*n0 |
| 647 | ldp x12,x13,[x1,#8*6] |
| 648 | add x3,x1,x5 |
| 649 | ldp x21,x22,[sp,#8*2] |
| 650 | stp x23,x24,[x2,#8*4] |
| 651 | ldp x23,x24,[sp,#8*4] |
| 652 | stp x25,x26,[x2,#8*6] |
| 653 | ldp x25,x26,[sp,#8*6] |
| 654 | add x1,x1,#8*8 |
| 655 | mov x30,xzr // initial top-most carry |
| 656 | mov x2,sp |
| 657 | mov x27,#8 |
| 658 | |
Robert Sloan | 8ff0355 | 2017-06-14 12:40:58 -0700 | [diff] [blame^] | 659 | Lsqr8x_reduction: |
Adam Langley | fad6327 | 2015-11-12 12:15:39 -0800 | [diff] [blame] | 660 | // (*) mul x14,x6,x28 // lo(n[0-7])*lo(t[0]*n0) |
| 661 | mul x15,x7,x28 |
| 662 | sub x27,x27,#1 |
| 663 | mul x16,x8,x28 |
| 664 | str x28,[x2],#8 // put aside t[0]*n0 for tail processing |
| 665 | mul x17,x9,x28 |
| 666 | // (*) adds xzr,x19,x14 |
| 667 | subs xzr,x19,#1 // (*) |
| 668 | mul x14,x10,x28 |
| 669 | adcs x19,x20,x15 |
| 670 | mul x15,x11,x28 |
| 671 | adcs x20,x21,x16 |
| 672 | mul x16,x12,x28 |
| 673 | adcs x21,x22,x17 |
| 674 | mul x17,x13,x28 |
| 675 | adcs x22,x23,x14 |
| 676 | umulh x14,x6,x28 // hi(n[0-7])*lo(t[0]*n0) |
| 677 | adcs x23,x24,x15 |
| 678 | umulh x15,x7,x28 |
| 679 | adcs x24,x25,x16 |
| 680 | umulh x16,x8,x28 |
| 681 | adcs x25,x26,x17 |
| 682 | umulh x17,x9,x28 |
| 683 | adc x26,xzr,xzr |
| 684 | adds x19,x19,x14 |
| 685 | umulh x14,x10,x28 |
| 686 | adcs x20,x20,x15 |
| 687 | umulh x15,x11,x28 |
| 688 | adcs x21,x21,x16 |
| 689 | umulh x16,x12,x28 |
| 690 | adcs x22,x22,x17 |
| 691 | umulh x17,x13,x28 |
| 692 | mul x28,x4,x19 // next t[0]*n0 |
| 693 | adcs x23,x23,x14 |
| 694 | adcs x24,x24,x15 |
| 695 | adcs x25,x25,x16 |
| 696 | adc x26,x26,x17 |
Robert Sloan | 8ff0355 | 2017-06-14 12:40:58 -0700 | [diff] [blame^] | 697 | cbnz x27,Lsqr8x_reduction |
Adam Langley | fad6327 | 2015-11-12 12:15:39 -0800 | [diff] [blame] | 698 | |
| 699 | ldp x14,x15,[x2,#8*0] |
| 700 | ldp x16,x17,[x2,#8*2] |
| 701 | mov x0,x2 |
| 702 | sub x27,x3,x1 // done yet? |
| 703 | adds x19,x19,x14 |
| 704 | adcs x20,x20,x15 |
| 705 | ldp x14,x15,[x2,#8*4] |
| 706 | adcs x21,x21,x16 |
| 707 | adcs x22,x22,x17 |
| 708 | ldp x16,x17,[x2,#8*6] |
| 709 | adcs x23,x23,x14 |
| 710 | adcs x24,x24,x15 |
| 711 | adcs x25,x25,x16 |
| 712 | adcs x26,x26,x17 |
| 713 | //adc x28,xzr,xzr // moved below |
Robert Sloan | 8ff0355 | 2017-06-14 12:40:58 -0700 | [diff] [blame^] | 714 | cbz x27,Lsqr8x8_post_condition |
Adam Langley | fad6327 | 2015-11-12 12:15:39 -0800 | [diff] [blame] | 715 | |
| 716 | ldr x4,[x2,#-8*8] |
| 717 | ldp x6,x7,[x1,#8*0] |
| 718 | ldp x8,x9,[x1,#8*2] |
| 719 | ldp x10,x11,[x1,#8*4] |
| 720 | mov x27,#-8*8 |
| 721 | ldp x12,x13,[x1,#8*6] |
| 722 | add x1,x1,#8*8 |
| 723 | |
Robert Sloan | 8ff0355 | 2017-06-14 12:40:58 -0700 | [diff] [blame^] | 724 | Lsqr8x_tail: |
Adam Langley | fad6327 | 2015-11-12 12:15:39 -0800 | [diff] [blame] | 725 | mul x14,x6,x4 |
| 726 | adc x28,xzr,xzr // carry bit, modulo-scheduled |
| 727 | mul x15,x7,x4 |
| 728 | add x27,x27,#8 |
| 729 | mul x16,x8,x4 |
| 730 | mul x17,x9,x4 |
| 731 | adds x19,x19,x14 |
| 732 | mul x14,x10,x4 |
| 733 | adcs x20,x20,x15 |
| 734 | mul x15,x11,x4 |
| 735 | adcs x21,x21,x16 |
| 736 | mul x16,x12,x4 |
| 737 | adcs x22,x22,x17 |
| 738 | mul x17,x13,x4 |
| 739 | adcs x23,x23,x14 |
| 740 | umulh x14,x6,x4 |
| 741 | adcs x24,x24,x15 |
| 742 | umulh x15,x7,x4 |
| 743 | adcs x25,x25,x16 |
| 744 | umulh x16,x8,x4 |
| 745 | adcs x26,x26,x17 |
| 746 | umulh x17,x9,x4 |
| 747 | adc x28,x28,xzr |
| 748 | str x19,[x2],#8 |
| 749 | adds x19,x20,x14 |
| 750 | umulh x14,x10,x4 |
| 751 | adcs x20,x21,x15 |
| 752 | umulh x15,x11,x4 |
| 753 | adcs x21,x22,x16 |
| 754 | umulh x16,x12,x4 |
| 755 | adcs x22,x23,x17 |
| 756 | umulh x17,x13,x4 |
| 757 | ldr x4,[x0,x27] |
| 758 | adcs x23,x24,x14 |
| 759 | adcs x24,x25,x15 |
| 760 | adcs x25,x26,x16 |
| 761 | adcs x26,x28,x17 |
| 762 | //adc x28,xzr,xzr // moved above |
Robert Sloan | 8ff0355 | 2017-06-14 12:40:58 -0700 | [diff] [blame^] | 763 | cbnz x27,Lsqr8x_tail |
Adam Langley | fad6327 | 2015-11-12 12:15:39 -0800 | [diff] [blame] | 764 | // note that carry flag is guaranteed |
| 765 | // to be zero at this point |
| 766 | ldp x6,x7,[x2,#8*0] |
| 767 | sub x27,x3,x1 // done yet? |
| 768 | sub x16,x3,x5 // rewinded np |
| 769 | ldp x8,x9,[x2,#8*2] |
| 770 | ldp x10,x11,[x2,#8*4] |
| 771 | ldp x12,x13,[x2,#8*6] |
Robert Sloan | 8ff0355 | 2017-06-14 12:40:58 -0700 | [diff] [blame^] | 772 | cbz x27,Lsqr8x_tail_break |
Adam Langley | fad6327 | 2015-11-12 12:15:39 -0800 | [diff] [blame] | 773 | |
| 774 | ldr x4,[x0,#-8*8] |
| 775 | adds x19,x19,x6 |
| 776 | adcs x20,x20,x7 |
| 777 | ldp x6,x7,[x1,#8*0] |
| 778 | adcs x21,x21,x8 |
| 779 | adcs x22,x22,x9 |
| 780 | ldp x8,x9,[x1,#8*2] |
| 781 | adcs x23,x23,x10 |
| 782 | adcs x24,x24,x11 |
| 783 | ldp x10,x11,[x1,#8*4] |
| 784 | adcs x25,x25,x12 |
| 785 | mov x27,#-8*8 |
| 786 | adcs x26,x26,x13 |
| 787 | ldp x12,x13,[x1,#8*6] |
| 788 | add x1,x1,#8*8 |
| 789 | //adc x28,xzr,xzr // moved above |
Robert Sloan | 8ff0355 | 2017-06-14 12:40:58 -0700 | [diff] [blame^] | 790 | b Lsqr8x_tail |
Adam Langley | fad6327 | 2015-11-12 12:15:39 -0800 | [diff] [blame] | 791 | |
| 792 | .align 4 |
Robert Sloan | 8ff0355 | 2017-06-14 12:40:58 -0700 | [diff] [blame^] | 793 | Lsqr8x_tail_break: |
Adam Langley | fad6327 | 2015-11-12 12:15:39 -0800 | [diff] [blame] | 794 | ldr x4,[x29,#112] // pull n0 |
| 795 | add x27,x2,#8*8 // end of current t[num] window |
| 796 | |
| 797 | subs xzr,x30,#1 // "move" top-most carry to carry bit |
| 798 | adcs x14,x19,x6 |
| 799 | adcs x15,x20,x7 |
| 800 | ldp x19,x20,[x0,#8*0] |
| 801 | adcs x21,x21,x8 |
| 802 | ldp x6,x7,[x16,#8*0] // recall that x16 is &n[0] |
| 803 | adcs x22,x22,x9 |
| 804 | ldp x8,x9,[x16,#8*2] |
| 805 | adcs x23,x23,x10 |
| 806 | adcs x24,x24,x11 |
| 807 | ldp x10,x11,[x16,#8*4] |
| 808 | adcs x25,x25,x12 |
| 809 | adcs x26,x26,x13 |
| 810 | ldp x12,x13,[x16,#8*6] |
| 811 | add x1,x16,#8*8 |
| 812 | adc x30,xzr,xzr // top-most carry |
| 813 | mul x28,x4,x19 |
| 814 | stp x14,x15,[x2,#8*0] |
| 815 | stp x21,x22,[x2,#8*2] |
| 816 | ldp x21,x22,[x0,#8*2] |
| 817 | stp x23,x24,[x2,#8*4] |
| 818 | ldp x23,x24,[x0,#8*4] |
| 819 | cmp x27,x29 // did we hit the bottom? |
| 820 | stp x25,x26,[x2,#8*6] |
| 821 | mov x2,x0 // slide the window |
| 822 | ldp x25,x26,[x0,#8*6] |
| 823 | mov x27,#8 |
Robert Sloan | 8ff0355 | 2017-06-14 12:40:58 -0700 | [diff] [blame^] | 824 | b.ne Lsqr8x_reduction |
Adam Langley | fad6327 | 2015-11-12 12:15:39 -0800 | [diff] [blame] | 825 | |
| 826 | // Final step. We see if result is larger than modulus, and |
| 827 | // if it is, subtract the modulus. But comparison implies |
| 828 | // subtraction. So we subtract modulus, see if it borrowed, |
| 829 | // and conditionally copy original value. |
| 830 | ldr x0,[x29,#96] // pull rp |
| 831 | add x2,x2,#8*8 |
| 832 | subs x14,x19,x6 |
| 833 | sbcs x15,x20,x7 |
| 834 | sub x27,x5,#8*8 |
| 835 | mov x3,x0 // x0 copy |
| 836 | |
Robert Sloan | 8ff0355 | 2017-06-14 12:40:58 -0700 | [diff] [blame^] | 837 | Lsqr8x_sub: |
Adam Langley | fad6327 | 2015-11-12 12:15:39 -0800 | [diff] [blame] | 838 | sbcs x16,x21,x8 |
| 839 | ldp x6,x7,[x1,#8*0] |
| 840 | sbcs x17,x22,x9 |
| 841 | stp x14,x15,[x0,#8*0] |
| 842 | sbcs x14,x23,x10 |
| 843 | ldp x8,x9,[x1,#8*2] |
| 844 | sbcs x15,x24,x11 |
| 845 | stp x16,x17,[x0,#8*2] |
| 846 | sbcs x16,x25,x12 |
| 847 | ldp x10,x11,[x1,#8*4] |
| 848 | sbcs x17,x26,x13 |
| 849 | ldp x12,x13,[x1,#8*6] |
| 850 | add x1,x1,#8*8 |
| 851 | ldp x19,x20,[x2,#8*0] |
| 852 | sub x27,x27,#8*8 |
| 853 | ldp x21,x22,[x2,#8*2] |
| 854 | ldp x23,x24,[x2,#8*4] |
| 855 | ldp x25,x26,[x2,#8*6] |
| 856 | add x2,x2,#8*8 |
| 857 | stp x14,x15,[x0,#8*4] |
| 858 | sbcs x14,x19,x6 |
| 859 | stp x16,x17,[x0,#8*6] |
| 860 | add x0,x0,#8*8 |
| 861 | sbcs x15,x20,x7 |
Robert Sloan | 8ff0355 | 2017-06-14 12:40:58 -0700 | [diff] [blame^] | 862 | cbnz x27,Lsqr8x_sub |
Adam Langley | fad6327 | 2015-11-12 12:15:39 -0800 | [diff] [blame] | 863 | |
| 864 | sbcs x16,x21,x8 |
| 865 | mov x2,sp |
| 866 | add x1,sp,x5 |
| 867 | ldp x6,x7,[x3,#8*0] |
| 868 | sbcs x17,x22,x9 |
| 869 | stp x14,x15,[x0,#8*0] |
| 870 | sbcs x14,x23,x10 |
| 871 | ldp x8,x9,[x3,#8*2] |
| 872 | sbcs x15,x24,x11 |
| 873 | stp x16,x17,[x0,#8*2] |
| 874 | sbcs x16,x25,x12 |
| 875 | ldp x19,x20,[x1,#8*0] |
| 876 | sbcs x17,x26,x13 |
| 877 | ldp x21,x22,[x1,#8*2] |
| 878 | sbcs xzr,x30,xzr // did it borrow? |
| 879 | ldr x30,[x29,#8] // pull return address |
| 880 | stp x14,x15,[x0,#8*4] |
| 881 | stp x16,x17,[x0,#8*6] |
| 882 | |
| 883 | sub x27,x5,#8*4 |
Robert Sloan | 8ff0355 | 2017-06-14 12:40:58 -0700 | [diff] [blame^] | 884 | Lsqr4x_cond_copy: |
Adam Langley | fad6327 | 2015-11-12 12:15:39 -0800 | [diff] [blame] | 885 | sub x27,x27,#8*4 |
| 886 | csel x14,x19,x6,lo |
| 887 | stp xzr,xzr,[x2,#8*0] |
| 888 | csel x15,x20,x7,lo |
| 889 | ldp x6,x7,[x3,#8*4] |
| 890 | ldp x19,x20,[x1,#8*4] |
| 891 | csel x16,x21,x8,lo |
| 892 | stp xzr,xzr,[x2,#8*2] |
| 893 | add x2,x2,#8*4 |
| 894 | csel x17,x22,x9,lo |
| 895 | ldp x8,x9,[x3,#8*6] |
| 896 | ldp x21,x22,[x1,#8*6] |
| 897 | add x1,x1,#8*4 |
| 898 | stp x14,x15,[x3,#8*0] |
| 899 | stp x16,x17,[x3,#8*2] |
| 900 | add x3,x3,#8*4 |
| 901 | stp xzr,xzr,[x1,#8*0] |
| 902 | stp xzr,xzr,[x1,#8*2] |
Robert Sloan | 8ff0355 | 2017-06-14 12:40:58 -0700 | [diff] [blame^] | 903 | cbnz x27,Lsqr4x_cond_copy |
Adam Langley | fad6327 | 2015-11-12 12:15:39 -0800 | [diff] [blame] | 904 | |
| 905 | csel x14,x19,x6,lo |
| 906 | stp xzr,xzr,[x2,#8*0] |
| 907 | csel x15,x20,x7,lo |
| 908 | stp xzr,xzr,[x2,#8*2] |
| 909 | csel x16,x21,x8,lo |
| 910 | csel x17,x22,x9,lo |
| 911 | stp x14,x15,[x3,#8*0] |
| 912 | stp x16,x17,[x3,#8*2] |
| 913 | |
Robert Sloan | 8ff0355 | 2017-06-14 12:40:58 -0700 | [diff] [blame^] | 914 | b Lsqr8x_done |
Adam Langley | fad6327 | 2015-11-12 12:15:39 -0800 | [diff] [blame] | 915 | |
| 916 | .align 4 |
Robert Sloan | 8ff0355 | 2017-06-14 12:40:58 -0700 | [diff] [blame^] | 917 | Lsqr8x8_post_condition: |
Adam Langley | fad6327 | 2015-11-12 12:15:39 -0800 | [diff] [blame] | 918 | adc x28,xzr,xzr |
| 919 | ldr x30,[x29,#8] // pull return address |
| 920 | // x19-7,x28 hold result, x6-7 hold modulus |
| 921 | subs x6,x19,x6 |
| 922 | ldr x1,[x29,#96] // pull rp |
| 923 | sbcs x7,x20,x7 |
| 924 | stp xzr,xzr,[sp,#8*0] |
| 925 | sbcs x8,x21,x8 |
| 926 | stp xzr,xzr,[sp,#8*2] |
| 927 | sbcs x9,x22,x9 |
| 928 | stp xzr,xzr,[sp,#8*4] |
| 929 | sbcs x10,x23,x10 |
| 930 | stp xzr,xzr,[sp,#8*6] |
| 931 | sbcs x11,x24,x11 |
| 932 | stp xzr,xzr,[sp,#8*8] |
| 933 | sbcs x12,x25,x12 |
| 934 | stp xzr,xzr,[sp,#8*10] |
| 935 | sbcs x13,x26,x13 |
| 936 | stp xzr,xzr,[sp,#8*12] |
| 937 | sbcs x28,x28,xzr // did it borrow? |
| 938 | stp xzr,xzr,[sp,#8*14] |
| 939 | |
| 940 | // x6-7 hold result-modulus |
| 941 | csel x6,x19,x6,lo |
| 942 | csel x7,x20,x7,lo |
| 943 | csel x8,x21,x8,lo |
| 944 | csel x9,x22,x9,lo |
| 945 | stp x6,x7,[x1,#8*0] |
| 946 | csel x10,x23,x10,lo |
| 947 | csel x11,x24,x11,lo |
| 948 | stp x8,x9,[x1,#8*2] |
| 949 | csel x12,x25,x12,lo |
| 950 | csel x13,x26,x13,lo |
| 951 | stp x10,x11,[x1,#8*4] |
| 952 | stp x12,x13,[x1,#8*6] |
| 953 | |
Robert Sloan | 8ff0355 | 2017-06-14 12:40:58 -0700 | [diff] [blame^] | 954 | Lsqr8x_done: |
Adam Langley | fad6327 | 2015-11-12 12:15:39 -0800 | [diff] [blame] | 955 | ldp x19,x20,[x29,#16] |
| 956 | mov sp,x29 |
| 957 | ldp x21,x22,[x29,#32] |
| 958 | mov x0,#1 |
| 959 | ldp x23,x24,[x29,#48] |
| 960 | ldp x25,x26,[x29,#64] |
| 961 | ldp x27,x28,[x29,#80] |
| 962 | ldr x29,[sp],#128 |
| 963 | ret |
Robert Sloan | 8ff0355 | 2017-06-14 12:40:58 -0700 | [diff] [blame^] | 964 | |
| 965 | |
Adam Langley | fad6327 | 2015-11-12 12:15:39 -0800 | [diff] [blame] | 966 | .align 5 |
| 967 | __bn_mul4x_mont: |
| 968 | stp x29,x30,[sp,#-128]! |
| 969 | add x29,sp,#0 |
| 970 | stp x19,x20,[sp,#16] |
| 971 | stp x21,x22,[sp,#32] |
| 972 | stp x23,x24,[sp,#48] |
| 973 | stp x25,x26,[sp,#64] |
| 974 | stp x27,x28,[sp,#80] |
| 975 | |
| 976 | sub x26,sp,x5,lsl#3 |
| 977 | lsl x5,x5,#3 |
| 978 | ldr x4,[x4] // *n0 |
| 979 | sub sp,x26,#8*4 // alloca |
| 980 | |
| 981 | add x10,x2,x5 |
| 982 | add x27,x1,x5 |
| 983 | stp x0,x10,[x29,#96] // offload rp and &b[num] |
| 984 | |
| 985 | ldr x24,[x2,#8*0] // b[0] |
| 986 | ldp x6,x7,[x1,#8*0] // a[0..3] |
| 987 | ldp x8,x9,[x1,#8*2] |
| 988 | add x1,x1,#8*4 |
| 989 | mov x19,xzr |
| 990 | mov x20,xzr |
| 991 | mov x21,xzr |
| 992 | mov x22,xzr |
| 993 | ldp x14,x15,[x3,#8*0] // n[0..3] |
| 994 | ldp x16,x17,[x3,#8*2] |
| 995 | adds x3,x3,#8*4 // clear carry bit |
| 996 | mov x0,xzr |
| 997 | mov x28,#0 |
| 998 | mov x26,sp |
| 999 | |
Robert Sloan | 8ff0355 | 2017-06-14 12:40:58 -0700 | [diff] [blame^] | 1000 | Loop_mul4x_1st_reduction: |
Adam Langley | fad6327 | 2015-11-12 12:15:39 -0800 | [diff] [blame] | 1001 | mul x10,x6,x24 // lo(a[0..3]*b[0]) |
| 1002 | adc x0,x0,xzr // modulo-scheduled |
| 1003 | mul x11,x7,x24 |
| 1004 | add x28,x28,#8 |
| 1005 | mul x12,x8,x24 |
| 1006 | and x28,x28,#31 |
| 1007 | mul x13,x9,x24 |
| 1008 | adds x19,x19,x10 |
| 1009 | umulh x10,x6,x24 // hi(a[0..3]*b[0]) |
| 1010 | adcs x20,x20,x11 |
| 1011 | mul x25,x19,x4 // t[0]*n0 |
| 1012 | adcs x21,x21,x12 |
| 1013 | umulh x11,x7,x24 |
| 1014 | adcs x22,x22,x13 |
| 1015 | umulh x12,x8,x24 |
| 1016 | adc x23,xzr,xzr |
| 1017 | umulh x13,x9,x24 |
| 1018 | ldr x24,[x2,x28] // next b[i] (or b[0]) |
| 1019 | adds x20,x20,x10 |
| 1020 | // (*) mul x10,x14,x25 // lo(n[0..3]*t[0]*n0) |
| 1021 | str x25,[x26],#8 // put aside t[0]*n0 for tail processing |
| 1022 | adcs x21,x21,x11 |
| 1023 | mul x11,x15,x25 |
| 1024 | adcs x22,x22,x12 |
| 1025 | mul x12,x16,x25 |
| 1026 | adc x23,x23,x13 // can't overflow |
| 1027 | mul x13,x17,x25 |
| 1028 | // (*) adds xzr,x19,x10 |
| 1029 | subs xzr,x19,#1 // (*) |
| 1030 | umulh x10,x14,x25 // hi(n[0..3]*t[0]*n0) |
| 1031 | adcs x19,x20,x11 |
| 1032 | umulh x11,x15,x25 |
| 1033 | adcs x20,x21,x12 |
| 1034 | umulh x12,x16,x25 |
| 1035 | adcs x21,x22,x13 |
| 1036 | umulh x13,x17,x25 |
| 1037 | adcs x22,x23,x0 |
| 1038 | adc x0,xzr,xzr |
| 1039 | adds x19,x19,x10 |
| 1040 | sub x10,x27,x1 |
| 1041 | adcs x20,x20,x11 |
| 1042 | adcs x21,x21,x12 |
| 1043 | adcs x22,x22,x13 |
| 1044 | //adc x0,x0,xzr |
Robert Sloan | 8ff0355 | 2017-06-14 12:40:58 -0700 | [diff] [blame^] | 1045 | cbnz x28,Loop_mul4x_1st_reduction |
Adam Langley | fad6327 | 2015-11-12 12:15:39 -0800 | [diff] [blame] | 1046 | |
Robert Sloan | 8ff0355 | 2017-06-14 12:40:58 -0700 | [diff] [blame^] | 1047 | cbz x10,Lmul4x4_post_condition |
Adam Langley | fad6327 | 2015-11-12 12:15:39 -0800 | [diff] [blame] | 1048 | |
| 1049 | ldp x6,x7,[x1,#8*0] // a[4..7] |
| 1050 | ldp x8,x9,[x1,#8*2] |
| 1051 | add x1,x1,#8*4 |
| 1052 | ldr x25,[sp] // a[0]*n0 |
| 1053 | ldp x14,x15,[x3,#8*0] // n[4..7] |
| 1054 | ldp x16,x17,[x3,#8*2] |
| 1055 | add x3,x3,#8*4 |
| 1056 | |
Robert Sloan | 8ff0355 | 2017-06-14 12:40:58 -0700 | [diff] [blame^] | 1057 | Loop_mul4x_1st_tail: |
Adam Langley | fad6327 | 2015-11-12 12:15:39 -0800 | [diff] [blame] | 1058 | mul x10,x6,x24 // lo(a[4..7]*b[i]) |
| 1059 | adc x0,x0,xzr // modulo-scheduled |
| 1060 | mul x11,x7,x24 |
| 1061 | add x28,x28,#8 |
| 1062 | mul x12,x8,x24 |
| 1063 | and x28,x28,#31 |
| 1064 | mul x13,x9,x24 |
| 1065 | adds x19,x19,x10 |
| 1066 | umulh x10,x6,x24 // hi(a[4..7]*b[i]) |
| 1067 | adcs x20,x20,x11 |
| 1068 | umulh x11,x7,x24 |
| 1069 | adcs x21,x21,x12 |
| 1070 | umulh x12,x8,x24 |
| 1071 | adcs x22,x22,x13 |
| 1072 | umulh x13,x9,x24 |
| 1073 | adc x23,xzr,xzr |
| 1074 | ldr x24,[x2,x28] // next b[i] (or b[0]) |
| 1075 | adds x20,x20,x10 |
| 1076 | mul x10,x14,x25 // lo(n[4..7]*a[0]*n0) |
| 1077 | adcs x21,x21,x11 |
| 1078 | mul x11,x15,x25 |
| 1079 | adcs x22,x22,x12 |
| 1080 | mul x12,x16,x25 |
| 1081 | adc x23,x23,x13 // can't overflow |
| 1082 | mul x13,x17,x25 |
| 1083 | adds x19,x19,x10 |
| 1084 | umulh x10,x14,x25 // hi(n[4..7]*a[0]*n0) |
| 1085 | adcs x20,x20,x11 |
| 1086 | umulh x11,x15,x25 |
| 1087 | adcs x21,x21,x12 |
| 1088 | umulh x12,x16,x25 |
| 1089 | adcs x22,x22,x13 |
| 1090 | adcs x23,x23,x0 |
| 1091 | umulh x13,x17,x25 |
| 1092 | adc x0,xzr,xzr |
| 1093 | ldr x25,[sp,x28] // next t[0]*n0 |
| 1094 | str x19,[x26],#8 // result!!! |
| 1095 | adds x19,x20,x10 |
| 1096 | sub x10,x27,x1 // done yet? |
| 1097 | adcs x20,x21,x11 |
| 1098 | adcs x21,x22,x12 |
| 1099 | adcs x22,x23,x13 |
| 1100 | //adc x0,x0,xzr |
Robert Sloan | 8ff0355 | 2017-06-14 12:40:58 -0700 | [diff] [blame^] | 1101 | cbnz x28,Loop_mul4x_1st_tail |
Adam Langley | fad6327 | 2015-11-12 12:15:39 -0800 | [diff] [blame] | 1102 | |
| 1103 | sub x11,x27,x5 // rewinded x1 |
Robert Sloan | 8ff0355 | 2017-06-14 12:40:58 -0700 | [diff] [blame^] | 1104 | cbz x10,Lmul4x_proceed |
Adam Langley | fad6327 | 2015-11-12 12:15:39 -0800 | [diff] [blame] | 1105 | |
| 1106 | ldp x6,x7,[x1,#8*0] |
| 1107 | ldp x8,x9,[x1,#8*2] |
| 1108 | add x1,x1,#8*4 |
| 1109 | ldp x14,x15,[x3,#8*0] |
| 1110 | ldp x16,x17,[x3,#8*2] |
| 1111 | add x3,x3,#8*4 |
Robert Sloan | 8ff0355 | 2017-06-14 12:40:58 -0700 | [diff] [blame^] | 1112 | b Loop_mul4x_1st_tail |
Adam Langley | fad6327 | 2015-11-12 12:15:39 -0800 | [diff] [blame] | 1113 | |
| 1114 | .align 5 |
Robert Sloan | 8ff0355 | 2017-06-14 12:40:58 -0700 | [diff] [blame^] | 1115 | Lmul4x_proceed: |
Adam Langley | fad6327 | 2015-11-12 12:15:39 -0800 | [diff] [blame] | 1116 | ldr x24,[x2,#8*4]! // *++b |
| 1117 | adc x30,x0,xzr |
| 1118 | ldp x6,x7,[x11,#8*0] // a[0..3] |
| 1119 | sub x3,x3,x5 // rewind np |
| 1120 | ldp x8,x9,[x11,#8*2] |
| 1121 | add x1,x11,#8*4 |
| 1122 | |
| 1123 | stp x19,x20,[x26,#8*0] // result!!! |
| 1124 | ldp x19,x20,[sp,#8*4] // t[0..3] |
| 1125 | stp x21,x22,[x26,#8*2] // result!!! |
| 1126 | ldp x21,x22,[sp,#8*6] |
| 1127 | |
| 1128 | ldp x14,x15,[x3,#8*0] // n[0..3] |
| 1129 | mov x26,sp |
| 1130 | ldp x16,x17,[x3,#8*2] |
| 1131 | adds x3,x3,#8*4 // clear carry bit |
| 1132 | mov x0,xzr |
| 1133 | |
| 1134 | .align 4 |
Robert Sloan | 8ff0355 | 2017-06-14 12:40:58 -0700 | [diff] [blame^] | 1135 | Loop_mul4x_reduction: |
Adam Langley | fad6327 | 2015-11-12 12:15:39 -0800 | [diff] [blame] | 1136 | mul x10,x6,x24 // lo(a[0..3]*b[4]) |
| 1137 | adc x0,x0,xzr // modulo-scheduled |
| 1138 | mul x11,x7,x24 |
| 1139 | add x28,x28,#8 |
| 1140 | mul x12,x8,x24 |
| 1141 | and x28,x28,#31 |
| 1142 | mul x13,x9,x24 |
| 1143 | adds x19,x19,x10 |
| 1144 | umulh x10,x6,x24 // hi(a[0..3]*b[4]) |
| 1145 | adcs x20,x20,x11 |
| 1146 | mul x25,x19,x4 // t[0]*n0 |
| 1147 | adcs x21,x21,x12 |
| 1148 | umulh x11,x7,x24 |
| 1149 | adcs x22,x22,x13 |
| 1150 | umulh x12,x8,x24 |
| 1151 | adc x23,xzr,xzr |
| 1152 | umulh x13,x9,x24 |
| 1153 | ldr x24,[x2,x28] // next b[i] |
| 1154 | adds x20,x20,x10 |
| 1155 | // (*) mul x10,x14,x25 |
| 1156 | str x25,[x26],#8 // put aside t[0]*n0 for tail processing |
| 1157 | adcs x21,x21,x11 |
| 1158 | mul x11,x15,x25 // lo(n[0..3]*t[0]*n0 |
| 1159 | adcs x22,x22,x12 |
| 1160 | mul x12,x16,x25 |
| 1161 | adc x23,x23,x13 // can't overflow |
| 1162 | mul x13,x17,x25 |
| 1163 | // (*) adds xzr,x19,x10 |
| 1164 | subs xzr,x19,#1 // (*) |
| 1165 | umulh x10,x14,x25 // hi(n[0..3]*t[0]*n0 |
| 1166 | adcs x19,x20,x11 |
| 1167 | umulh x11,x15,x25 |
| 1168 | adcs x20,x21,x12 |
| 1169 | umulh x12,x16,x25 |
| 1170 | adcs x21,x22,x13 |
| 1171 | umulh x13,x17,x25 |
| 1172 | adcs x22,x23,x0 |
| 1173 | adc x0,xzr,xzr |
| 1174 | adds x19,x19,x10 |
| 1175 | adcs x20,x20,x11 |
| 1176 | adcs x21,x21,x12 |
| 1177 | adcs x22,x22,x13 |
| 1178 | //adc x0,x0,xzr |
Robert Sloan | 8ff0355 | 2017-06-14 12:40:58 -0700 | [diff] [blame^] | 1179 | cbnz x28,Loop_mul4x_reduction |
Adam Langley | fad6327 | 2015-11-12 12:15:39 -0800 | [diff] [blame] | 1180 | |
| 1181 | adc x0,x0,xzr |
| 1182 | ldp x10,x11,[x26,#8*4] // t[4..7] |
| 1183 | ldp x12,x13,[x26,#8*6] |
| 1184 | ldp x6,x7,[x1,#8*0] // a[4..7] |
| 1185 | ldp x8,x9,[x1,#8*2] |
| 1186 | add x1,x1,#8*4 |
| 1187 | adds x19,x19,x10 |
| 1188 | adcs x20,x20,x11 |
| 1189 | adcs x21,x21,x12 |
| 1190 | adcs x22,x22,x13 |
| 1191 | //adc x0,x0,xzr |
| 1192 | |
| 1193 | ldr x25,[sp] // t[0]*n0 |
| 1194 | ldp x14,x15,[x3,#8*0] // n[4..7] |
| 1195 | ldp x16,x17,[x3,#8*2] |
| 1196 | add x3,x3,#8*4 |
| 1197 | |
| 1198 | .align 4 |
Robert Sloan | 8ff0355 | 2017-06-14 12:40:58 -0700 | [diff] [blame^] | 1199 | Loop_mul4x_tail: |
Adam Langley | fad6327 | 2015-11-12 12:15:39 -0800 | [diff] [blame] | 1200 | mul x10,x6,x24 // lo(a[4..7]*b[4]) |
| 1201 | adc x0,x0,xzr // modulo-scheduled |
| 1202 | mul x11,x7,x24 |
| 1203 | add x28,x28,#8 |
| 1204 | mul x12,x8,x24 |
| 1205 | and x28,x28,#31 |
| 1206 | mul x13,x9,x24 |
| 1207 | adds x19,x19,x10 |
| 1208 | umulh x10,x6,x24 // hi(a[4..7]*b[4]) |
| 1209 | adcs x20,x20,x11 |
| 1210 | umulh x11,x7,x24 |
| 1211 | adcs x21,x21,x12 |
| 1212 | umulh x12,x8,x24 |
| 1213 | adcs x22,x22,x13 |
| 1214 | umulh x13,x9,x24 |
| 1215 | adc x23,xzr,xzr |
| 1216 | ldr x24,[x2,x28] // next b[i] |
| 1217 | adds x20,x20,x10 |
| 1218 | mul x10,x14,x25 // lo(n[4..7]*t[0]*n0) |
| 1219 | adcs x21,x21,x11 |
| 1220 | mul x11,x15,x25 |
| 1221 | adcs x22,x22,x12 |
| 1222 | mul x12,x16,x25 |
| 1223 | adc x23,x23,x13 // can't overflow |
| 1224 | mul x13,x17,x25 |
| 1225 | adds x19,x19,x10 |
| 1226 | umulh x10,x14,x25 // hi(n[4..7]*t[0]*n0) |
| 1227 | adcs x20,x20,x11 |
| 1228 | umulh x11,x15,x25 |
| 1229 | adcs x21,x21,x12 |
| 1230 | umulh x12,x16,x25 |
| 1231 | adcs x22,x22,x13 |
| 1232 | umulh x13,x17,x25 |
| 1233 | adcs x23,x23,x0 |
| 1234 | ldr x25,[sp,x28] // next a[0]*n0 |
| 1235 | adc x0,xzr,xzr |
| 1236 | str x19,[x26],#8 // result!!! |
| 1237 | adds x19,x20,x10 |
| 1238 | sub x10,x27,x1 // done yet? |
| 1239 | adcs x20,x21,x11 |
| 1240 | adcs x21,x22,x12 |
| 1241 | adcs x22,x23,x13 |
| 1242 | //adc x0,x0,xzr |
Robert Sloan | 8ff0355 | 2017-06-14 12:40:58 -0700 | [diff] [blame^] | 1243 | cbnz x28,Loop_mul4x_tail |
Adam Langley | fad6327 | 2015-11-12 12:15:39 -0800 | [diff] [blame] | 1244 | |
| 1245 | sub x11,x3,x5 // rewinded np? |
| 1246 | adc x0,x0,xzr |
Robert Sloan | 8ff0355 | 2017-06-14 12:40:58 -0700 | [diff] [blame^] | 1247 | cbz x10,Loop_mul4x_break |
Adam Langley | fad6327 | 2015-11-12 12:15:39 -0800 | [diff] [blame] | 1248 | |
| 1249 | ldp x10,x11,[x26,#8*4] |
| 1250 | ldp x12,x13,[x26,#8*6] |
| 1251 | ldp x6,x7,[x1,#8*0] |
| 1252 | ldp x8,x9,[x1,#8*2] |
| 1253 | add x1,x1,#8*4 |
| 1254 | adds x19,x19,x10 |
| 1255 | adcs x20,x20,x11 |
| 1256 | adcs x21,x21,x12 |
| 1257 | adcs x22,x22,x13 |
| 1258 | //adc x0,x0,xzr |
| 1259 | ldp x14,x15,[x3,#8*0] |
| 1260 | ldp x16,x17,[x3,#8*2] |
| 1261 | add x3,x3,#8*4 |
Robert Sloan | 8ff0355 | 2017-06-14 12:40:58 -0700 | [diff] [blame^] | 1262 | b Loop_mul4x_tail |
Adam Langley | fad6327 | 2015-11-12 12:15:39 -0800 | [diff] [blame] | 1263 | |
| 1264 | .align 4 |
Robert Sloan | 8ff0355 | 2017-06-14 12:40:58 -0700 | [diff] [blame^] | 1265 | Loop_mul4x_break: |
Adam Langley | fad6327 | 2015-11-12 12:15:39 -0800 | [diff] [blame] | 1266 | ldp x12,x13,[x29,#96] // pull rp and &b[num] |
| 1267 | adds x19,x19,x30 |
| 1268 | add x2,x2,#8*4 // bp++ |
| 1269 | adcs x20,x20,xzr |
| 1270 | sub x1,x1,x5 // rewind ap |
| 1271 | adcs x21,x21,xzr |
| 1272 | stp x19,x20,[x26,#8*0] // result!!! |
| 1273 | adcs x22,x22,xzr |
| 1274 | ldp x19,x20,[sp,#8*4] // t[0..3] |
| 1275 | adc x30,x0,xzr |
| 1276 | stp x21,x22,[x26,#8*2] // result!!! |
| 1277 | cmp x2,x13 // done yet? |
| 1278 | ldp x21,x22,[sp,#8*6] |
| 1279 | ldp x14,x15,[x11,#8*0] // n[0..3] |
| 1280 | ldp x16,x17,[x11,#8*2] |
| 1281 | add x3,x11,#8*4 |
Robert Sloan | 8ff0355 | 2017-06-14 12:40:58 -0700 | [diff] [blame^] | 1282 | b.eq Lmul4x_post |
Adam Langley | fad6327 | 2015-11-12 12:15:39 -0800 | [diff] [blame] | 1283 | |
| 1284 | ldr x24,[x2] |
| 1285 | ldp x6,x7,[x1,#8*0] // a[0..3] |
| 1286 | ldp x8,x9,[x1,#8*2] |
| 1287 | adds x1,x1,#8*4 // clear carry bit |
| 1288 | mov x0,xzr |
| 1289 | mov x26,sp |
Robert Sloan | 8ff0355 | 2017-06-14 12:40:58 -0700 | [diff] [blame^] | 1290 | b Loop_mul4x_reduction |
Adam Langley | fad6327 | 2015-11-12 12:15:39 -0800 | [diff] [blame] | 1291 | |
| 1292 | .align 4 |
Robert Sloan | 8ff0355 | 2017-06-14 12:40:58 -0700 | [diff] [blame^] | 1293 | Lmul4x_post: |
Adam Langley | fad6327 | 2015-11-12 12:15:39 -0800 | [diff] [blame] | 1294 | // Final step. We see if result is larger than modulus, and |
| 1295 | // if it is, subtract the modulus. But comparison implies |
| 1296 | // subtraction. So we subtract modulus, see if it borrowed, |
| 1297 | // and conditionally copy original value. |
| 1298 | mov x0,x12 |
| 1299 | mov x27,x12 // x0 copy |
| 1300 | subs x10,x19,x14 |
| 1301 | add x26,sp,#8*8 |
| 1302 | sbcs x11,x20,x15 |
| 1303 | sub x28,x5,#8*4 |
| 1304 | |
Robert Sloan | 8ff0355 | 2017-06-14 12:40:58 -0700 | [diff] [blame^] | 1305 | Lmul4x_sub: |
Adam Langley | fad6327 | 2015-11-12 12:15:39 -0800 | [diff] [blame] | 1306 | sbcs x12,x21,x16 |
| 1307 | ldp x14,x15,[x3,#8*0] |
| 1308 | sub x28,x28,#8*4 |
| 1309 | ldp x19,x20,[x26,#8*0] |
| 1310 | sbcs x13,x22,x17 |
| 1311 | ldp x16,x17,[x3,#8*2] |
| 1312 | add x3,x3,#8*4 |
| 1313 | ldp x21,x22,[x26,#8*2] |
| 1314 | add x26,x26,#8*4 |
| 1315 | stp x10,x11,[x0,#8*0] |
| 1316 | sbcs x10,x19,x14 |
| 1317 | stp x12,x13,[x0,#8*2] |
| 1318 | add x0,x0,#8*4 |
| 1319 | sbcs x11,x20,x15 |
Robert Sloan | 8ff0355 | 2017-06-14 12:40:58 -0700 | [diff] [blame^] | 1320 | cbnz x28,Lmul4x_sub |
Adam Langley | fad6327 | 2015-11-12 12:15:39 -0800 | [diff] [blame] | 1321 | |
| 1322 | sbcs x12,x21,x16 |
| 1323 | mov x26,sp |
| 1324 | add x1,sp,#8*4 |
| 1325 | ldp x6,x7,[x27,#8*0] |
| 1326 | sbcs x13,x22,x17 |
| 1327 | stp x10,x11,[x0,#8*0] |
| 1328 | ldp x8,x9,[x27,#8*2] |
| 1329 | stp x12,x13,[x0,#8*2] |
| 1330 | ldp x19,x20,[x1,#8*0] |
| 1331 | ldp x21,x22,[x1,#8*2] |
| 1332 | sbcs xzr,x30,xzr // did it borrow? |
| 1333 | ldr x30,[x29,#8] // pull return address |
| 1334 | |
| 1335 | sub x28,x5,#8*4 |
Robert Sloan | 8ff0355 | 2017-06-14 12:40:58 -0700 | [diff] [blame^] | 1336 | Lmul4x_cond_copy: |
Adam Langley | fad6327 | 2015-11-12 12:15:39 -0800 | [diff] [blame] | 1337 | sub x28,x28,#8*4 |
| 1338 | csel x10,x19,x6,lo |
| 1339 | stp xzr,xzr,[x26,#8*0] |
| 1340 | csel x11,x20,x7,lo |
| 1341 | ldp x6,x7,[x27,#8*4] |
| 1342 | ldp x19,x20,[x1,#8*4] |
| 1343 | csel x12,x21,x8,lo |
| 1344 | stp xzr,xzr,[x26,#8*2] |
| 1345 | add x26,x26,#8*4 |
| 1346 | csel x13,x22,x9,lo |
| 1347 | ldp x8,x9,[x27,#8*6] |
| 1348 | ldp x21,x22,[x1,#8*6] |
| 1349 | add x1,x1,#8*4 |
| 1350 | stp x10,x11,[x27,#8*0] |
| 1351 | stp x12,x13,[x27,#8*2] |
| 1352 | add x27,x27,#8*4 |
Robert Sloan | 8ff0355 | 2017-06-14 12:40:58 -0700 | [diff] [blame^] | 1353 | cbnz x28,Lmul4x_cond_copy |
Adam Langley | fad6327 | 2015-11-12 12:15:39 -0800 | [diff] [blame] | 1354 | |
| 1355 | csel x10,x19,x6,lo |
| 1356 | stp xzr,xzr,[x26,#8*0] |
| 1357 | csel x11,x20,x7,lo |
| 1358 | stp xzr,xzr,[x26,#8*2] |
| 1359 | csel x12,x21,x8,lo |
| 1360 | stp xzr,xzr,[x26,#8*3] |
| 1361 | csel x13,x22,x9,lo |
| 1362 | stp xzr,xzr,[x26,#8*4] |
| 1363 | stp x10,x11,[x27,#8*0] |
| 1364 | stp x12,x13,[x27,#8*2] |
| 1365 | |
Robert Sloan | 8ff0355 | 2017-06-14 12:40:58 -0700 | [diff] [blame^] | 1366 | b Lmul4x_done |
Adam Langley | fad6327 | 2015-11-12 12:15:39 -0800 | [diff] [blame] | 1367 | |
| 1368 | .align 4 |
Robert Sloan | 8ff0355 | 2017-06-14 12:40:58 -0700 | [diff] [blame^] | 1369 | Lmul4x4_post_condition: |
Adam Langley | fad6327 | 2015-11-12 12:15:39 -0800 | [diff] [blame] | 1370 | adc x0,x0,xzr |
| 1371 | ldr x1,[x29,#96] // pull rp |
| 1372 | // x19-3,x0 hold result, x14-7 hold modulus |
| 1373 | subs x6,x19,x14 |
| 1374 | ldr x30,[x29,#8] // pull return address |
| 1375 | sbcs x7,x20,x15 |
| 1376 | stp xzr,xzr,[sp,#8*0] |
| 1377 | sbcs x8,x21,x16 |
| 1378 | stp xzr,xzr,[sp,#8*2] |
| 1379 | sbcs x9,x22,x17 |
| 1380 | stp xzr,xzr,[sp,#8*4] |
| 1381 | sbcs xzr,x0,xzr // did it borrow? |
| 1382 | stp xzr,xzr,[sp,#8*6] |
| 1383 | |
| 1384 | // x6-3 hold result-modulus |
| 1385 | csel x6,x19,x6,lo |
| 1386 | csel x7,x20,x7,lo |
| 1387 | csel x8,x21,x8,lo |
| 1388 | csel x9,x22,x9,lo |
| 1389 | stp x6,x7,[x1,#8*0] |
| 1390 | stp x8,x9,[x1,#8*2] |
| 1391 | |
Robert Sloan | 8ff0355 | 2017-06-14 12:40:58 -0700 | [diff] [blame^] | 1392 | Lmul4x_done: |
Adam Langley | fad6327 | 2015-11-12 12:15:39 -0800 | [diff] [blame] | 1393 | ldp x19,x20,[x29,#16] |
| 1394 | mov sp,x29 |
| 1395 | ldp x21,x22,[x29,#32] |
| 1396 | mov x0,#1 |
| 1397 | ldp x23,x24,[x29,#48] |
| 1398 | ldp x25,x26,[x29,#64] |
| 1399 | ldp x27,x28,[x29,#80] |
| 1400 | ldr x29,[sp],#128 |
| 1401 | ret |
Robert Sloan | 8ff0355 | 2017-06-14 12:40:58 -0700 | [diff] [blame^] | 1402 | |
Adam Langley | fad6327 | 2015-11-12 12:15:39 -0800 | [diff] [blame] | 1403 | .byte 77,111,110,116,103,111,109,101,114,121,32,77,117,108,116,105,112,108,105,99,97,116,105,111,110,32,102,111,114,32,65,82,77,118,56,44,32,67,82,89,80,84,79,71,65,77,83,32,98,121,32,60,97,112,112,114,111,64,111,112,101,110,115,115,108,46,111,114,103,62,0 |
| 1404 | .align 2 |
| 1405 | .align 4 |