arch/sparc/lib/U3memcpy.S

   1 /* U3memcpy.S: UltraSparc-III optimized memcpy.
   2  *
   3  * Copyright (C) 1999, 2000, 2004 David S. Miller (davem@redhat.com)
   4  */
   5
   6 #ifdef __KERNEL__
   7 #include <linux/linkage.h>
   8 #include <asm/visasm.h>
   9 #include <asm/asi.h>
  10 #define GLOBAL_SPARE    %g7
  11 #else
  12 #define ASI_BLK_P 0xf0
  13 #define FPRS_FEF  0x04
  14 #ifdef MEMCPY_DEBUG
  15 #define VISEntryHalf rd %fprs, %o5; wr %g0, FPRS_FEF, %fprs; \
  16                      clr %g1; clr %g2; clr %g3; subcc %g0, %g0, %g0;
  17 #define VISExitHalf and %o5, FPRS_FEF, %o5; wr %o5, 0x0, %fprs
  18 #else
  19 #define VISEntryHalf rd %fprs, %o5; wr %g0, FPRS_FEF, %fprs
  20 #define VISExitHalf and %o5, FPRS_FEF, %o5; wr %o5, 0x0, %fprs
  21 #endif
  22 #define GLOBAL_SPARE    %g5
  23 #endif
  24
  25 #ifndef EX_LD
  26 #define EX_LD(x,y)      x
  27 #endif
  28 #ifndef EX_LD_FP
  29 #define EX_LD_FP(x,y)   x
  30 #endif
  31
  32 #ifndef EX_ST
  33 #define EX_ST(x,y)      x
  34 #endif
  35 #ifndef EX_ST_FP
  36 #define EX_ST_FP(x,y)   x
  37 #endif
  38
  39 #ifndef LOAD
  40 #define LOAD(type,addr,dest)    type [addr], dest
  41 #endif
  42
  43 #ifndef STORE
  44 #define STORE(type,src,addr)    type src, [addr]
  45 #endif
  46
  47 #ifndef STORE_BLK
  48 #define STORE_BLK(src,addr)     stda src, [addr] ASI_BLK_P
  49 #endif
  50
  51 #ifndef FUNC_NAME
  52 #define FUNC_NAME       U3memcpy
  53 #endif
  54
  55 #ifndef PREAMBLE
  56 #define PREAMBLE
  57 #endif
  58
  59 #ifndef XCC
  60 #define XCC xcc
  61 #endif
  62
  63         .register       %g2,#scratch
  64         .register       %g3,#scratch
  65
  66         /* Special/non-trivial issues of this code:
  67          *
  68          * 1) %o5 is preserved from VISEntryHalf to VISExitHalf
  69          * 2) Only low 32 FPU registers are used so that only the
  70          *    lower half of the FPU register set is dirtied by this
  71          *    code.  This is especially important in the kernel.
  72          * 3) This code never prefetches cachelines past the end
  73          *    of the source buffer.
  74          */
  75
  76         .text
  77 #ifndef EX_RETVAL
  78 #define EX_RETVAL(x)    x
  79 __restore_fp:
  80         VISExitHalf
  81         retl
  82          nop
  83 ENTRY(U3_retl_o2_plus_g2_plus_g1_plus_1_fp)
  84         add     %g1, 1, %g1
  85         add     %g2, %g1, %g2
  86         ba,pt   %xcc, __restore_fp
  87          add    %o2, %g2, %o0
  88 ENDPROC(U3_retl_o2_plus_g2_plus_g1_plus_1_fp)
  89 ENTRY(U3_retl_o2_plus_g2_fp)
  90         ba,pt   %xcc, __restore_fp
  91          add    %o2, %g2, %o0
  92 ENDPROC(U3_retl_o2_plus_g2_fp)
  93 ENTRY(U3_retl_o2_plus_g2_plus_8_fp)
  94         add     %g2, 8, %g2
  95         ba,pt   %xcc, __restore_fp
  96          add    %o2, %g2, %o0
  97 ENDPROC(U3_retl_o2_plus_g2_plus_8_fp)
  98 ENTRY(U3_retl_o2)
  99         retl
 100          mov    %o2, %o0
 101 ENDPROC(U3_retl_o2)
 102 ENTRY(U3_retl_o2_plus_1)
 103         retl
 104          add    %o2, 1, %o0
 105 ENDPROC(U3_retl_o2_plus_1)
 106 ENTRY(U3_retl_o2_plus_4)
 107         retl
 108          add    %o2, 4, %o0
 109 ENDPROC(U3_retl_o2_plus_4)
 110 ENTRY(U3_retl_o2_plus_8)
 111         retl
 112          add    %o2, 8, %o0
 113 ENDPROC(U3_retl_o2_plus_8)
 114 ENTRY(U3_retl_o2_plus_g1_plus_1)
 115         add     %g1, 1, %g1
 116         retl
 117          add    %o2, %g1, %o0
 118 ENDPROC(U3_retl_o2_plus_g1_plus_1)
 119 ENTRY(U3_retl_o2_fp)
 120         ba,pt   %xcc, __restore_fp
 121          mov    %o2, %o0
 122 ENDPROC(U3_retl_o2_fp)
 123 ENTRY(U3_retl_o2_plus_o3_sll_6_plus_0x80_fp)
 124         sll     %o3, 6, %o3
 125         add     %o3, 0x80, %o3
 126         ba,pt   %xcc, __restore_fp
 127          add    %o2, %o3, %o0
 128 ENDPROC(U3_retl_o2_plus_o3_sll_6_plus_0x80_fp)
 129 ENTRY(U3_retl_o2_plus_o3_sll_6_plus_0x40_fp)
 130         sll     %o3, 6, %o3
 131         add     %o3, 0x40, %o3
 132         ba,pt   %xcc, __restore_fp
 133          add    %o2, %o3, %o0
 134 ENDPROC(U3_retl_o2_plus_o3_sll_6_plus_0x40_fp)
 135 ENTRY(U3_retl_o2_plus_GS_plus_0x10)
 136         add     GLOBAL_SPARE, 0x10, GLOBAL_SPARE
 137         retl
 138          add    %o2, GLOBAL_SPARE, %o0
 139 ENDPROC(U3_retl_o2_plus_GS_plus_0x10)
 140 ENTRY(U3_retl_o2_plus_GS_plus_0x08)
 141         add     GLOBAL_SPARE, 0x08, GLOBAL_SPARE
 142         retl
 143          add    %o2, GLOBAL_SPARE, %o0
 144 ENDPROC(U3_retl_o2_plus_GS_plus_0x08)
 145 ENTRY(U3_retl_o2_and_7_plus_GS)
 146         and     %o2, 7, %o2
 147         retl
 148          add    %o2, GLOBAL_SPARE, %o0
 149 ENDPROC(U3_retl_o2_and_7_plus_GS)
 150 ENTRY(U3_retl_o2_and_7_plus_GS_plus_8)
 151         add     GLOBAL_SPARE, 8, GLOBAL_SPARE
 152         and     %o2, 7, %o2
 153         retl
 154          add    %o2, GLOBAL_SPARE, %o0
 155 ENDPROC(U3_retl_o2_and_7_plus_GS_plus_8)
 156 #endif
 157
 158         .align          64
 159
 160         /* The cheetah's flexible spine, oversized liver, enlarged heart,
 161          * slender muscular body, and claws make it the swiftest hunter
 162          * in Africa and the fastest animal on land.  Can reach speeds
 163          * of up to 2.4GB per second.
 164          */
 165
 166         .globl  FUNC_NAME
 167         .type   FUNC_NAME,#function
 168 FUNC_NAME:      /* %o0=dst, %o1=src, %o2=len */
 169         srlx            %o2, 31, %g2
 170         cmp             %g2, 0
 171         tne             %xcc, 5
 172         PREAMBLE
 173         mov             %o0, %o4
 174         cmp             %o2, 0
 175         be,pn           %XCC, 85f
 176          or             %o0, %o1, %o3
 177         cmp             %o2, 16
 178         blu,a,pn        %XCC, 80f
 179          or             %o3, %o2, %o3
 180
 181         cmp             %o2, (3 * 64)
 182         blu,pt          %XCC, 70f
 183          andcc          %o3, 0x7, %g0
 184
 185         /* Clobbers o5/g1/g2/g3/g7/icc/xcc.  We must preserve
 186          * o5 from here until we hit VISExitHalf.
 187          */
 188         VISEntryHalf
 189
 190         /* Is 'dst' already aligned on an 64-byte boundary? */
 191         andcc           %o0, 0x3f, %g2
 192         be,pt           %XCC, 2f
 193
 194         /* Compute abs((dst & 0x3f) - 0x40) into %g2.  This is the number
 195          * of bytes to copy to make 'dst' 64-byte aligned.  We pre-
 196          * subtract this from 'len'.
 197          */
 198          sub            %o0, %o1, GLOBAL_SPARE
 199         sub             %g2, 0x40, %g2
 200         sub             %g0, %g2, %g2
 201         sub             %o2, %g2, %o2
 202         andcc           %g2, 0x7, %g1
 203         be,pt           %icc, 2f
 204          and            %g2, 0x38, %g2
 205
 206 1:      subcc           %g1, 0x1, %g1
 207         EX_LD_FP(LOAD(ldub, %o1 + 0x00, %o3), U3_retl_o2_plus_g2_plus_g1_plus_1)
 208         EX_ST_FP(STORE(stb, %o3, %o1 + GLOBAL_SPARE), U3_retl_o2_plus_g2_plus_g1_plus_1)
 209         bgu,pt          %XCC, 1b
 210          add            %o1, 0x1, %o1
 211
 212         add             %o1, GLOBAL_SPARE, %o0
 213
 214 2:      cmp             %g2, 0x0
 215         and             %o1, 0x7, %g1
 216         be,pt           %icc, 3f
 217          alignaddr      %o1, %g0, %o1
 218
 219         EX_LD_FP(LOAD(ldd, %o1, %f4), U3_retl_o2_plus_g2)
 220 1:      EX_LD_FP(LOAD(ldd, %o1 + 0x8, %f6), U3_retl_o2_plus_g2)
 221         add             %o1, 0x8, %o1
 222         subcc           %g2, 0x8, %g2
 223         faligndata      %f4, %f6, %f0
 224         EX_ST_FP(STORE(std, %f0, %o0), U3_retl_o2_plus_g2_plus_8)
 225         be,pn           %icc, 3f
 226          add            %o0, 0x8, %o0
 227
 228         EX_LD_FP(LOAD(ldd, %o1 + 0x8, %f4), U3_retl_o2_plus_g2)
 229         add             %o1, 0x8, %o1
 230         subcc           %g2, 0x8, %g2
 231         faligndata      %f6, %f4, %f2
 232         EX_ST_FP(STORE(std, %f2, %o0), U3_retl_o2_plus_g2_plus_8)
 233         bne,pt          %icc, 1b
 234          add            %o0, 0x8, %o0
 235
 236 3:      LOAD(prefetch, %o1 + 0x000, #one_read)
 237         LOAD(prefetch, %o1 + 0x040, #one_read)
 238         andn            %o2, (0x40 - 1), GLOBAL_SPARE
 239         LOAD(prefetch, %o1 + 0x080, #one_read)
 240         LOAD(prefetch, %o1 + 0x0c0, #one_read)
 241         LOAD(prefetch, %o1 + 0x100, #one_read)
 242         EX_LD_FP(LOAD(ldd, %o1 + 0x000, %f0), U3_retl_o2)
 243         LOAD(prefetch, %o1 + 0x140, #one_read)
 244         EX_LD_FP(LOAD(ldd, %o1 + 0x008, %f2), U3_retl_o2)
 245         LOAD(prefetch, %o1 + 0x180, #one_read)
 246         EX_LD_FP(LOAD(ldd, %o1 + 0x010, %f4), U3_retl_o2)
 247         LOAD(prefetch, %o1 + 0x1c0, #one_read)
 248         faligndata      %f0, %f2, %f16
 249         EX_LD_FP(LOAD(ldd, %o1 + 0x018, %f6), U3_retl_o2)
 250         faligndata      %f2, %f4, %f18
 251         EX_LD_FP(LOAD(ldd, %o1 + 0x020, %f8), U3_retl_o2)
 252         faligndata      %f4, %f6, %f20
 253         EX_LD_FP(LOAD(ldd, %o1 + 0x028, %f10), U3_retl_o2)
 254         faligndata      %f6, %f8, %f22
 255
 256         EX_LD_FP(LOAD(ldd, %o1 + 0x030, %f12), U3_retl_o2)
 257         faligndata      %f8, %f10, %f24
 258         EX_LD_FP(LOAD(ldd, %o1 + 0x038, %f14), U3_retl_o2)
 259         faligndata      %f10, %f12, %f26
 260         EX_LD_FP(LOAD(ldd, %o1 + 0x040, %f0), U3_retl_o2)
 261
 262         subcc           GLOBAL_SPARE, 0x80, GLOBAL_SPARE
 263         add             %o1, 0x40, %o1
 264         bgu,pt          %XCC, 1f
 265          srl            GLOBAL_SPARE, 6, %o3
 266         ba,pt           %xcc, 2f
 267          nop
 268
 269         .align          64
 270 1:
 271         EX_LD_FP(LOAD(ldd, %o1 + 0x008, %f2), U3_retl_o2_plus_o3_sll_6_plus_0x80)
 272         faligndata      %f12, %f14, %f28
 273         EX_LD_FP(LOAD(ldd, %o1 + 0x010, %f4), U3_retl_o2_plus_o3_sll_6_plus_0x80)
 274         faligndata      %f14, %f0, %f30
 275         EX_ST_FP(STORE_BLK(%f16, %o0), U3_retl_o2_plus_o3_sll_6_plus_0x80)
 276         EX_LD_FP(LOAD(ldd, %o1 + 0x018, %f6), U3_retl_o2_plus_o3_sll_6_plus_0x40)
 277         faligndata      %f0, %f2, %f16
 278         add             %o0, 0x40, %o0
 279
 280         EX_LD_FP(LOAD(ldd, %o1 + 0x020, %f8), U3_retl_o2_plus_o3_sll_6_plus_0x40)
 281         faligndata      %f2, %f4, %f18
 282         EX_LD_FP(LOAD(ldd, %o1 + 0x028, %f10), U3_retl_o2_plus_o3_sll_6_plus_0x40)
 283         faligndata      %f4, %f6, %f20
 284         EX_LD_FP(LOAD(ldd, %o1 + 0x030, %f12), U3_retl_o2_plus_o3_sll_6_plus_0x40)
 285         subcc           %o3, 0x01, %o3
 286         faligndata      %f6, %f8, %f22
 287         EX_LD_FP(LOAD(ldd, %o1 + 0x038, %f14), U3_retl_o2_plus_o3_sll_6_plus_0x80)
 288
 289         faligndata      %f8, %f10, %f24
 290         EX_LD_FP(LOAD(ldd, %o1 + 0x040, %f0), U3_retl_o2_plus_o3_sll_6_plus_0x80)
 291         LOAD(prefetch, %o1 + 0x1c0, #one_read)
 292         faligndata      %f10, %f12, %f26
 293         bg,pt           %XCC, 1b
 294          add            %o1, 0x40, %o1
 295
 296         /* Finally we copy the last full 64-byte block. */
 297 2:
 298         EX_LD_FP(LOAD(ldd, %o1 + 0x008, %f2), U3_retl_o2_plus_o3_sll_6_plus_0x80)
 299         faligndata      %f12, %f14, %f28
 300         EX_LD_FP(LOAD(ldd, %o1 + 0x010, %f4), U3_retl_o2_plus_o3_sll_6_plus_0x80)
 301         faligndata      %f14, %f0, %f30
 302         EX_ST_FP(STORE_BLK(%f16, %o0), U3_retl_o2_plus_o3_sll_6_plus_0x80)
 303         EX_LD_FP(LOAD(ldd, %o1 + 0x018, %f6), U3_retl_o2_plus_o3_sll_6_plus_0x40)
 304         faligndata      %f0, %f2, %f16
 305         EX_LD_FP(LOAD(ldd, %o1 + 0x020, %f8), U3_retl_o2_plus_o3_sll_6_plus_0x40)
 306         faligndata      %f2, %f4, %f18
 307         EX_LD_FP(LOAD(ldd, %o1 + 0x028, %f10), U3_retl_o2_plus_o3_sll_6_plus_0x40)
 308         faligndata      %f4, %f6, %f20
 309         EX_LD_FP(LOAD(ldd, %o1 + 0x030, %f12), U3_retl_o2_plus_o3_sll_6_plus_0x40)
 310         faligndata      %f6, %f8, %f22
 311         EX_LD_FP(LOAD(ldd, %o1 + 0x038, %f14), U3_retl_o2_plus_o3_sll_6_plus_0x40)
 312         faligndata      %f8, %f10, %f24
 313         cmp             %g1, 0
 314         be,pt           %XCC, 1f
 315          add            %o0, 0x40, %o0
 316         EX_LD_FP(LOAD(ldd, %o1 + 0x040, %f0), U3_retl_o2_plus_o3_sll_6_plus_0x40)
 317 1:      faligndata      %f10, %f12, %f26
 318         faligndata      %f12, %f14, %f28
 319         faligndata      %f14, %f0, %f30
 320         EX_ST_FP(STORE_BLK(%f16, %o0), U3_retl_o2_plus_o3_sll_6_plus_0x40)
 321         add             %o0, 0x40, %o0
 322         add             %o1, 0x40, %o1
 323         membar          #Sync
 324
 325         /* Now we copy the (len modulo 64) bytes at the end.
 326          * Note how we borrow the %f0 loaded above.
 327          *
 328          * Also notice how this code is careful not to perform a
 329          * load past the end of the src buffer.
 330          */
 331         and             %o2, 0x3f, %o2
 332         andcc           %o2, 0x38, %g2
 333         be,pn           %XCC, 2f
 334          subcc          %g2, 0x8, %g2
 335         be,pn           %XCC, 2f
 336          cmp            %g1, 0
 337
 338         sub             %o2, %g2, %o2
 339         be,a,pt         %XCC, 1f
 340          EX_LD_FP(LOAD(ldd, %o1 + 0x00, %f0), U3_retl_o2_plus_g2)
 341
 342 1:      EX_LD_FP(LOAD(ldd, %o1 + 0x08, %f2), U3_retl_o2_plus_g2)
 343         add             %o1, 0x8, %o1
 344         subcc           %g2, 0x8, %g2
 345         faligndata      %f0, %f2, %f8
 346         EX_ST_FP(STORE(std, %f8, %o0), U3_retl_o2_plus_g2_plus_8)
 347         be,pn           %XCC, 2f
 348          add            %o0, 0x8, %o0
 349         EX_LD_FP(LOAD(ldd, %o1 + 0x08, %f0), U3_retl_o2_plus_g2)
 350         add             %o1, 0x8, %o1
 351         subcc           %g2, 0x8, %g2
 352         faligndata      %f2, %f0, %f8
 353         EX_ST_FP(STORE(std, %f8, %o0), U3_retl_o2_plus_g2_plus_8)
 354         bne,pn          %XCC, 1b
 355          add            %o0, 0x8, %o0
 356
 357         /* If anything is left, we copy it one byte at a time.
 358          * Note that %g1 is (src & 0x3) saved above before the
 359          * alignaddr was performed.
 360          */
 361 2:
 362         cmp             %o2, 0
 363         add             %o1, %g1, %o1
 364         VISExitHalf
 365         be,pn           %XCC, 85f
 366          sub            %o0, %o1, %o3
 367
 368         andcc           %g1, 0x7, %g0
 369         bne,pn          %icc, 90f
 370          andcc          %o2, 0x8, %g0
 371         be,pt           %icc, 1f
 372          nop
 373         EX_LD(LOAD(ldx, %o1, %o5), U3_retl_o2)
 374         EX_ST(STORE(stx, %o5, %o1 + %o3), U3_retl_o2)
 375         add             %o1, 0x8, %o1
 376         sub             %o2, 8, %o2
 377
 378 1:      andcc           %o2, 0x4, %g0
 379         be,pt           %icc, 1f
 380          nop
 381         EX_LD(LOAD(lduw, %o1, %o5), U3_retl_o2)
 382         EX_ST(STORE(stw, %o5, %o1 + %o3), U3_retl_o2)
 383         add             %o1, 0x4, %o1
 384         sub             %o2, 4, %o2
 385
 386 1:      andcc           %o2, 0x2, %g0
 387         be,pt           %icc, 1f
 388          nop
 389         EX_LD(LOAD(lduh, %o1, %o5), U3_retl_o2)
 390         EX_ST(STORE(sth, %o5, %o1 + %o3), U3_retl_o2)
 391         add             %o1, 0x2, %o1
 392         sub             %o2, 2, %o2
 393
 394 1:      andcc           %o2, 0x1, %g0
 395         be,pt           %icc, 85f
 396          nop
 397         EX_LD(LOAD(ldub, %o1, %o5), U3_retl_o2)
 398         ba,pt           %xcc, 85f
 399          EX_ST(STORE(stb, %o5, %o1 + %o3), U3_retl_o2)
 400
 401         .align          64
 402 70: /* 16 < len <= 64 */
 403         bne,pn          %XCC, 75f
 404          sub            %o0, %o1, %o3
 405
 406 72:
 407         andn            %o2, 0xf, GLOBAL_SPARE
 408         and             %o2, 0xf, %o2
 409 1:      subcc           GLOBAL_SPARE, 0x10, GLOBAL_SPARE
 410         EX_LD(LOAD(ldx, %o1 + 0x00, %o5), U3_retl_o2_plus_GS_plus_0x10)
 411         EX_LD(LOAD(ldx, %o1 + 0x08, %g1), U3_retl_o2_plus_GS_plus_0x10)
 412         EX_ST(STORE(stx, %o5, %o1 + %o3), U3_retl_o2_plus_GS_plus_0x10)
 413         add             %o1, 0x8, %o1
 414         EX_ST(STORE(stx, %g1, %o1 + %o3), U3_retl_o2_plus_GS_plus_0x08)
 415         bgu,pt          %XCC, 1b
 416          add            %o1, 0x8, %o1
 417 73:     andcc           %o2, 0x8, %g0
 418         be,pt           %XCC, 1f
 419          nop
 420         sub             %o2, 0x8, %o2
 421         EX_LD(LOAD(ldx, %o1, %o5), U3_retl_o2_plus_8)
 422         EX_ST(STORE(stx, %o5, %o1 + %o3), U3_retl_o2_plus_8)
 423         add             %o1, 0x8, %o1
 424 1:      andcc           %o2, 0x4, %g0
 425         be,pt           %XCC, 1f
 426          nop
 427         sub             %o2, 0x4, %o2
 428         EX_LD(LOAD(lduw, %o1, %o5), U3_retl_o2_plus_4)
 429         EX_ST(STORE(stw, %o5, %o1 + %o3), U3_retl_o2_plus_4)
 430         add             %o1, 0x4, %o1
 431 1:      cmp             %o2, 0
 432         be,pt           %XCC, 85f
 433          nop
 434         ba,pt           %xcc, 90f
 435          nop
 436
 437 75:
 438         andcc           %o0, 0x7, %g1
 439         sub             %g1, 0x8, %g1
 440         be,pn           %icc, 2f
 441          sub            %g0, %g1, %g1
 442         sub             %o2, %g1, %o2
 443
 444 1:      subcc           %g1, 1, %g1
 445         EX_LD(LOAD(ldub, %o1, %o5), U3_retl_o2_plus_g1_plus_1)
 446         EX_ST(STORE(stb, %o5, %o1 + %o3), U3_retl_o2_plus_g1_plus_1)
 447         bgu,pt          %icc, 1b
 448          add            %o1, 1, %o1
 449
 450 2:      add             %o1, %o3, %o0
 451         andcc           %o1, 0x7, %g1
 452         bne,pt          %icc, 8f
 453          sll            %g1, 3, %g1
 454
 455         cmp             %o2, 16
 456         bgeu,pt         %icc, 72b
 457          nop
 458         ba,a,pt         %xcc, 73b
 459
 460 8:      mov             64, %o3
 461         andn            %o1, 0x7, %o1
 462         EX_LD(LOAD(ldx, %o1, %g2), U3_retl_o2)
 463         sub             %o3, %g1, %o3
 464         andn            %o2, 0x7, GLOBAL_SPARE
 465         sllx            %g2, %g1, %g2
 466 1:      EX_LD(LOAD(ldx, %o1 + 0x8, %g3), U3_retl_o2_and_7_plus_GS)
 467         subcc           GLOBAL_SPARE, 0x8, GLOBAL_SPARE
 468         add             %o1, 0x8, %o1
 469         srlx            %g3, %o3, %o5
 470         or              %o5, %g2, %o5
 471         EX_ST(STORE(stx, %o5, %o0), U3_retl_o2_and_7_plus_GS_plus_8)
 472         add             %o0, 0x8, %o0
 473         bgu,pt          %icc, 1b
 474          sllx           %g3, %g1, %g2
 475
 476         srl             %g1, 3, %g1
 477         andcc           %o2, 0x7, %o2
 478         be,pn           %icc, 85f
 479          add            %o1, %g1, %o1
 480         ba,pt           %xcc, 90f
 481          sub            %o0, %o1, %o3
 482
 483         .align          64
 484 80: /* 0 < len <= 16 */
 485         andcc           %o3, 0x3, %g0
 486         bne,pn          %XCC, 90f
 487          sub            %o0, %o1, %o3
 488
 489 1:
 490         subcc           %o2, 4, %o2
 491         EX_LD(LOAD(lduw, %o1, %g1), U3_retl_o2_plus_4)
 492         EX_ST(STORE(stw, %g1, %o1 + %o3), U3_retl_o2_plus_4)
 493         bgu,pt          %XCC, 1b
 494          add            %o1, 4, %o1
 495
 496 85:     retl
 497          mov            EX_RETVAL(%o4), %o0
 498
 499         .align          32
 500 90:
 501         subcc           %o2, 1, %o2
 502         EX_LD(LOAD(ldub, %o1, %g1), U3_retl_o2_plus_1)
 503         EX_ST(STORE(stb, %g1, %o1 + %o3), U3_retl_o2_plus_1)
 504         bgu,pt          %XCC, 90b
 505          add            %o1, 1, %o1
 506         retl
 507          mov            EX_RETVAL(%o4), %o0
 508
 509         .size           FUNC_NAME, .-FUNC_NAME