| /* Copy SIZE bytes from SRC to DEST. |
| For UltraSPARC-III. |
| Copyright (C) 2001, 2003 Free Software Foundation, Inc. |
| This file is part of the GNU C Library. |
| Contributed by David S. Miller (davem@redhat.com) |
| |
| The GNU C Library is free software; you can redistribute it and/or |
| modify it under the terms of the GNU Lesser General Public |
| License as published by the Free Software Foundation; either |
| version 2.1 of the License, or (at your option) any later version. |
| |
| The GNU C Library is distributed in the hope that it will be useful, |
| but WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| Lesser General Public License for more details. |
| |
| You should have received a copy of the GNU Lesser General Public |
| License along with the GNU C Library; if not, write to the Free |
| Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA |
| 02111-1307 USA. */ |
| |
| #include <sysdep.h> |
| |
| #define ASI_BLK_P 0xf0 |
| #define FPRS_FEF 0x04 |
| #define VISEntryHalf rd %fprs, %o5; wr %g0, FPRS_FEF, %fprs |
| #define VISExitHalf and %o5, FPRS_FEF, %o5; wr %o5, 0x0, %fprs |
| |
| #ifndef XCC |
| #define USE_BPR |
| #define XCC xcc |
| #endif |
| |
| #if !defined NOT_IN_libc |
| |
| .register %g2,#scratch |
| .register %g3,#scratch |
| .register %g6,#scratch |
| |
| .text |
| |
| /* Special/non-trivial issues of this code: |
| * |
| * 1) %o5 is preserved from VISEntryHalf to VISExitHalf |
| * 2) Only low 32 FPU registers are used so that only the |
| * lower half of the FPU register set is dirtied by this |
| * code. This is especially important in the kernel. |
| * 3) This code never prefetches cachelines past the end |
| * of the source buffer. |
| * |
| * The cheetah's flexible spine, oversized liver, enlarged heart, |
| * slender muscular body, and claws make it the swiftest hunter |
| * in Africa and the fastest animal on land. Can reach speeds |
| * of up to 2.4GB per second. |
| */ |
| .align 32 |
| ENTRY(__memcpy_ultra3) |
| |
| 100: /* %o0=dst, %o1=src, %o2=len */ |
| mov %o0, %g5 |
| cmp %o2, 0 |
| be,pn %XCC, out |
| 218: or %o0, %o1, %o3 |
| cmp %o2, 16 |
| bleu,a,pn %XCC, small_copy |
| or %o3, %o2, %o3 |
| |
| cmp %o2, 256 |
| blu,pt %XCC, medium_copy |
| andcc %o3, 0x7, %g0 |
| |
| ba,pt %xcc, enter |
| andcc %o0, 0x3f, %g2 |
| |
| /* Here len >= 256 and condition codes reflect execution |
| * of "andcc %o0, 0x7, %g2", done by caller. |
| */ |
| .align 64 |
| enter: |
| /* Is 'dst' already aligned on an 64-byte boundary? */ |
| be,pt %XCC, 2f |
| |
| /* Compute abs((dst & 0x3f) - 0x40) into %g2. This is the number |
| * of bytes to copy to make 'dst' 64-byte aligned. We pre- |
| * subtract this from 'len'. |
| */ |
| sub %g2, 0x40, %g2 |
| sub %g0, %g2, %g2 |
| sub %o2, %g2, %o2 |
| |
| /* Copy %g2 bytes from src to dst, one byte at a time. */ |
| 1: ldub [%o1 + 0x00], %o3 |
| add %o1, 0x1, %o1 |
| add %o0, 0x1, %o0 |
| subcc %g2, 0x1, %g2 |
| |
| bg,pt %XCC, 1b |
| stb %o3, [%o0 + -1] |
| |
| 2: VISEntryHalf |
| and %o1, 0x7, %g1 |
| ba,pt %xcc, begin |
| alignaddr %o1, %g0, %o1 |
| |
| .align 64 |
| begin: |
| prefetch [%o1 + 0x000], #one_read |
| prefetch [%o1 + 0x040], #one_read |
| andn %o2, (0x40 - 1), %o4 |
| prefetch [%o1 + 0x080], #one_read |
| prefetch [%o1 + 0x0c0], #one_read |
| ldd [%o1 + 0x000], %f0 |
| prefetch [%o1 + 0x100], #one_read |
| ldd [%o1 + 0x008], %f2 |
| prefetch [%o1 + 0x140], #one_read |
| ldd [%o1 + 0x010], %f4 |
| prefetch [%o1 + 0x180], #one_read |
| faligndata %f0, %f2, %f16 |
| ldd [%o1 + 0x018], %f6 |
| faligndata %f2, %f4, %f18 |
| ldd [%o1 + 0x020], %f8 |
| faligndata %f4, %f6, %f20 |
| ldd [%o1 + 0x028], %f10 |
| faligndata %f6, %f8, %f22 |
| |
| ldd [%o1 + 0x030], %f12 |
| faligndata %f8, %f10, %f24 |
| ldd [%o1 + 0x038], %f14 |
| faligndata %f10, %f12, %f26 |
| ldd [%o1 + 0x040], %f0 |
| |
| sub %o4, 0x80, %o4 |
| add %o1, 0x40, %o1 |
| ba,pt %xcc, loop |
| srl %o4, 6, %o3 |
| |
| .align 64 |
| loop: |
| ldd [%o1 + 0x008], %f2 |
| faligndata %f12, %f14, %f28 |
| ldd [%o1 + 0x010], %f4 |
| faligndata %f14, %f0, %f30 |
| stda %f16, [%o0] ASI_BLK_P |
| ldd [%o1 + 0x018], %f6 |
| faligndata %f0, %f2, %f16 |
| |
| ldd [%o1 + 0x020], %f8 |
| faligndata %f2, %f4, %f18 |
| ldd [%o1 + 0x028], %f10 |
| faligndata %f4, %f6, %f20 |
| ldd [%o1 + 0x030], %f12 |
| faligndata %f6, %f8, %f22 |
| ldd [%o1 + 0x038], %f14 |
| faligndata %f8, %f10, %f24 |
| |
| ldd [%o1 + 0x040], %f0 |
| prefetch [%o1 + 0x180], #one_read |
| faligndata %f10, %f12, %f26 |
| subcc %o3, 0x01, %o3 |
| add %o1, 0x40, %o1 |
| bg,pt %XCC, loop |
| add %o0, 0x40, %o0 |
| |
| /* Finally we copy the last full 64-byte block. */ |
| loopfini: |
| ldd [%o1 + 0x008], %f2 |
| faligndata %f12, %f14, %f28 |
| ldd [%o1 + 0x010], %f4 |
| faligndata %f14, %f0, %f30 |
| stda %f16, [%o0] ASI_BLK_P |
| ldd [%o1 + 0x018], %f6 |
| faligndata %f0, %f2, %f16 |
| ldd [%o1 + 0x020], %f8 |
| faligndata %f2, %f4, %f18 |
| ldd [%o1 + 0x028], %f10 |
| faligndata %f4, %f6, %f20 |
| ldd [%o1 + 0x030], %f12 |
| faligndata %f6, %f8, %f22 |
| ldd [%o1 + 0x038], %f14 |
| faligndata %f8, %f10, %f24 |
| cmp %g1, 0 |
| be,pt %XCC, 1f |
| add %o0, 0x40, %o0 |
| ldd [%o1 + 0x040], %f0 |
| 1: faligndata %f10, %f12, %f26 |
| faligndata %f12, %f14, %f28 |
| faligndata %f14, %f0, %f30 |
| stda %f16, [%o0] ASI_BLK_P |
| add %o0, 0x40, %o0 |
| add %o1, 0x40, %o1 |
| membar #Sync |
| |
| /* Now we copy the (len modulo 64) bytes at the end. |
| * Note how we borrow the %f0 loaded above. |
| * |
| * Also notice how this code is careful not to perform a |
| * load past the end of the src buffer. |
| */ |
| loopend: |
| and %o2, 0x3f, %o2 |
| andcc %o2, 0x38, %g2 |
| be,pn %XCC, endcruft |
| subcc %g2, 0x8, %g2 |
| be,pn %XCC, endcruft |
| cmp %g1, 0 |
| |
| be,a,pt %XCC, 1f |
| ldd [%o1 + 0x00], %f0 |
| |
| 1: ldd [%o1 + 0x08], %f2 |
| add %o1, 0x8, %o1 |
| sub %o2, 0x8, %o2 |
| subcc %g2, 0x8, %g2 |
| faligndata %f0, %f2, %f8 |
| std %f8, [%o0 + 0x00] |
| be,pn %XCC, endcruft |
| add %o0, 0x8, %o0 |
| ldd [%o1 + 0x08], %f0 |
| add %o1, 0x8, %o1 |
| sub %o2, 0x8, %o2 |
| subcc %g2, 0x8, %g2 |
| faligndata %f2, %f0, %f8 |
| std %f8, [%o0 + 0x00] |
| bne,pn %XCC, 1b |
| add %o0, 0x8, %o0 |
| |
| /* If anything is left, we copy it one byte at a time. |
| * Note that %g1 is (src & 0x3) saved above before the |
| * alignaddr was performed. |
| */ |
| endcruft: |
| cmp %o2, 0 |
| add %o1, %g1, %o1 |
| VISExitHalf |
| be,pn %XCC, out |
| sub %o0, %o1, %o3 |
| |
| andcc %g1, 0x7, %g0 |
| bne,pn %icc, small_copy_unaligned |
| andcc %o2, 0x8, %g0 |
| be,pt %icc, 1f |
| nop |
| ldx [%o1], %o5 |
| stx %o5, [%o1 + %o3] |
| add %o1, 0x8, %o1 |
| |
| 1: andcc %o2, 0x4, %g0 |
| be,pt %icc, 1f |
| nop |
| lduw [%o1], %o5 |
| stw %o5, [%o1 + %o3] |
| add %o1, 0x4, %o1 |
| |
| 1: andcc %o2, 0x2, %g0 |
| be,pt %icc, 1f |
| nop |
| lduh [%o1], %o5 |
| sth %o5, [%o1 + %o3] |
| add %o1, 0x2, %o1 |
| |
| 1: andcc %o2, 0x1, %g0 |
| be,pt %icc, out |
| nop |
| ldub [%o1], %o5 |
| ba,pt %xcc, out |
| stb %o5, [%o1 + %o3] |
| |
| medium_copy: /* 16 < len <= 64 */ |
| bne,pn %XCC, small_copy_unaligned |
| sub %o0, %o1, %o3 |
| |
| medium_copy_aligned: |
| andn %o2, 0x7, %o4 |
| and %o2, 0x7, %o2 |
| 1: subcc %o4, 0x8, %o4 |
| ldx [%o1], %o5 |
| stx %o5, [%o1 + %o3] |
| bgu,pt %XCC, 1b |
| add %o1, 0x8, %o1 |
| andcc %o2, 0x4, %g0 |
| be,pt %XCC, 1f |
| nop |
| sub %o2, 0x4, %o2 |
| lduw [%o1], %o5 |
| stw %o5, [%o1 + %o3] |
| add %o1, 0x4, %o1 |
| 1: cmp %o2, 0 |
| be,pt %XCC, out |
| nop |
| ba,pt %xcc, small_copy_unaligned |
| nop |
| |
| small_copy: /* 0 < len <= 16 */ |
| andcc %o3, 0x3, %g0 |
| bne,pn %XCC, small_copy_unaligned |
| sub %o0, %o1, %o3 |
| |
| small_copy_aligned: |
| subcc %o2, 4, %o2 |
| lduw [%o1], %g1 |
| stw %g1, [%o1 + %o3] |
| bgu,pt %XCC, small_copy_aligned |
| add %o1, 4, %o1 |
| |
| out: retl |
| mov %g5, %o0 |
| |
| .align 32 |
| small_copy_unaligned: |
| subcc %o2, 1, %o2 |
| ldub [%o1], %g1 |
| stb %g1, [%o1 + %o3] |
| bgu,pt %XCC, small_copy_unaligned |
| add %o1, 1, %o1 |
| retl |
| mov %g5, %o0 |
| |
| END(__memcpy_ultra3) |
| |
| #endif |
