325 lines
7.2 KiB
ArmAsm
325 lines
7.2 KiB
ArmAsm
/* Copy SIZE bytes from SRC to DEST.
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For UltraSPARC-III.
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Copyright (C) 2001-2022 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <sysdep.h>
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#define ASI_BLK_P 0xf0
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#define FPRS_FEF 0x04
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#define VISEntryHalf rd %fprs, %o5; wr %g0, FPRS_FEF, %fprs
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#define VISExitHalf and %o5, FPRS_FEF, %o5; wr %o5, 0x0, %fprs
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#ifndef XCC
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#define USE_BPR
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#define XCC xcc
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#endif
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#if IS_IN (libc)
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.register %g2,#scratch
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.register %g3,#scratch
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.register %g6,#scratch
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.text
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ENTRY(__mempcpy_ultra3)
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ba,pt %XCC, 101f
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add %o0, %o2, %g5
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END(__mempcpy_ultra3)
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/* Special/non-trivial issues of this code:
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*
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* 1) %o5 is preserved from VISEntryHalf to VISExitHalf
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* 2) Only low 32 FPU registers are used so that only the
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* lower half of the FPU register set is dirtied by this
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* code. This is especially important in the kernel.
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* 3) This code never prefetches cachelines past the end
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* of the source buffer.
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*
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* The cheetah's flexible spine, oversized liver, enlarged heart,
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* slender muscular body, and claws make it the swiftest hunter
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* in Africa and the fastest animal on land. Can reach speeds
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* of up to 2.4GB per second.
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*/
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.align 32
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ENTRY(__memcpy_ultra3)
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100: /* %o0=dst, %o1=src, %o2=len */
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mov %o0, %g5
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101:
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cmp %o2, 0
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be,pn %XCC, out
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218: or %o0, %o1, %o3
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cmp %o2, 16
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bleu,a,pn %XCC, small_copy
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or %o3, %o2, %o3
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cmp %o2, 256
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blu,pt %XCC, medium_copy
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andcc %o3, 0x7, %g0
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ba,pt %xcc, enter
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andcc %o0, 0x3f, %g2
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/* Here len >= 256 and condition codes reflect execution
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* of "andcc %o0, 0x7, %g2", done by caller.
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*/
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.align 64
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enter:
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/* Is 'dst' already aligned on an 64-byte boundary? */
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be,pt %XCC, 2f
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/* Compute abs((dst & 0x3f) - 0x40) into %g2. This is the number
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* of bytes to copy to make 'dst' 64-byte aligned. We pre-
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* subtract this from 'len'.
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*/
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sub %g2, 0x40, %g2
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sub %g0, %g2, %g2
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sub %o2, %g2, %o2
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/* Copy %g2 bytes from src to dst, one byte at a time. */
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1: ldub [%o1 + 0x00], %o3
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add %o1, 0x1, %o1
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add %o0, 0x1, %o0
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subcc %g2, 0x1, %g2
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bg,pt %XCC, 1b
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stb %o3, [%o0 + -1]
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2: VISEntryHalf
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and %o1, 0x7, %g1
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ba,pt %xcc, begin
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alignaddr %o1, %g0, %o1
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.align 64
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begin:
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prefetch [%o1 + 0x000], #one_read
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prefetch [%o1 + 0x040], #one_read
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andn %o2, (0x40 - 1), %o4
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prefetch [%o1 + 0x080], #one_read
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prefetch [%o1 + 0x0c0], #one_read
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ldd [%o1 + 0x000], %f0
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prefetch [%o1 + 0x100], #one_read
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ldd [%o1 + 0x008], %f2
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prefetch [%o1 + 0x140], #one_read
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ldd [%o1 + 0x010], %f4
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prefetch [%o1 + 0x180], #one_read
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faligndata %f0, %f2, %f16
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ldd [%o1 + 0x018], %f6
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faligndata %f2, %f4, %f18
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ldd [%o1 + 0x020], %f8
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faligndata %f4, %f6, %f20
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ldd [%o1 + 0x028], %f10
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faligndata %f6, %f8, %f22
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ldd [%o1 + 0x030], %f12
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faligndata %f8, %f10, %f24
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ldd [%o1 + 0x038], %f14
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faligndata %f10, %f12, %f26
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ldd [%o1 + 0x040], %f0
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sub %o4, 0x80, %o4
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add %o1, 0x40, %o1
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ba,pt %xcc, loop
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srl %o4, 6, %o3
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.align 64
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loop:
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ldd [%o1 + 0x008], %f2
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faligndata %f12, %f14, %f28
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ldd [%o1 + 0x010], %f4
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faligndata %f14, %f0, %f30
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stda %f16, [%o0] ASI_BLK_P
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ldd [%o1 + 0x018], %f6
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faligndata %f0, %f2, %f16
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ldd [%o1 + 0x020], %f8
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faligndata %f2, %f4, %f18
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ldd [%o1 + 0x028], %f10
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faligndata %f4, %f6, %f20
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ldd [%o1 + 0x030], %f12
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faligndata %f6, %f8, %f22
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ldd [%o1 + 0x038], %f14
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faligndata %f8, %f10, %f24
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ldd [%o1 + 0x040], %f0
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prefetch [%o1 + 0x180], #one_read
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faligndata %f10, %f12, %f26
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subcc %o3, 0x01, %o3
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add %o1, 0x40, %o1
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bg,pt %XCC, loop
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add %o0, 0x40, %o0
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/* Finally we copy the last full 64-byte block. */
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loopfini:
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ldd [%o1 + 0x008], %f2
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faligndata %f12, %f14, %f28
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ldd [%o1 + 0x010], %f4
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faligndata %f14, %f0, %f30
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stda %f16, [%o0] ASI_BLK_P
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ldd [%o1 + 0x018], %f6
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faligndata %f0, %f2, %f16
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ldd [%o1 + 0x020], %f8
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faligndata %f2, %f4, %f18
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ldd [%o1 + 0x028], %f10
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faligndata %f4, %f6, %f20
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ldd [%o1 + 0x030], %f12
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faligndata %f6, %f8, %f22
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ldd [%o1 + 0x038], %f14
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faligndata %f8, %f10, %f24
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cmp %g1, 0
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be,pt %XCC, 1f
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add %o0, 0x40, %o0
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ldd [%o1 + 0x040], %f0
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1: faligndata %f10, %f12, %f26
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faligndata %f12, %f14, %f28
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faligndata %f14, %f0, %f30
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stda %f16, [%o0] ASI_BLK_P
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add %o0, 0x40, %o0
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add %o1, 0x40, %o1
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membar #Sync
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/* Now we copy the (len modulo 64) bytes at the end.
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* Note how we borrow the %f0 loaded above.
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*
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* Also notice how this code is careful not to perform a
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* load past the end of the src buffer.
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*/
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loopend:
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and %o2, 0x3f, %o2
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andcc %o2, 0x38, %g2
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be,pn %XCC, endcruft
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subcc %g2, 0x8, %g2
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be,pn %XCC, endcruft
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cmp %g1, 0
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be,a,pt %XCC, 1f
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ldd [%o1 + 0x00], %f0
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1: ldd [%o1 + 0x08], %f2
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add %o1, 0x8, %o1
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sub %o2, 0x8, %o2
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subcc %g2, 0x8, %g2
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faligndata %f0, %f2, %f8
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std %f8, [%o0 + 0x00]
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be,pn %XCC, endcruft
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add %o0, 0x8, %o0
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ldd [%o1 + 0x08], %f0
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add %o1, 0x8, %o1
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sub %o2, 0x8, %o2
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subcc %g2, 0x8, %g2
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faligndata %f2, %f0, %f8
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std %f8, [%o0 + 0x00]
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bne,pn %XCC, 1b
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add %o0, 0x8, %o0
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/* If anything is left, we copy it one byte at a time.
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* Note that %g1 is (src & 0x3) saved above before the
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* alignaddr was performed.
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*/
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endcruft:
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cmp %o2, 0
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add %o1, %g1, %o1
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VISExitHalf
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be,pn %XCC, out
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sub %o0, %o1, %o3
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andcc %g1, 0x7, %g0
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bne,pn %icc, small_copy_unaligned
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andcc %o2, 0x8, %g0
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be,pt %icc, 1f
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nop
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ldx [%o1], %o5
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stx %o5, [%o1 + %o3]
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add %o1, 0x8, %o1
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1: andcc %o2, 0x4, %g0
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be,pt %icc, 1f
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nop
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lduw [%o1], %o5
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stw %o5, [%o1 + %o3]
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add %o1, 0x4, %o1
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1: andcc %o2, 0x2, %g0
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be,pt %icc, 1f
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nop
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lduh [%o1], %o5
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sth %o5, [%o1 + %o3]
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add %o1, 0x2, %o1
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1: andcc %o2, 0x1, %g0
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be,pt %icc, out
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nop
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ldub [%o1], %o5
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ba,pt %xcc, out
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stb %o5, [%o1 + %o3]
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medium_copy: /* 16 < len <= 64 */
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bne,pn %XCC, small_copy_unaligned
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sub %o0, %o1, %o3
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medium_copy_aligned:
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andn %o2, 0x7, %o4
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and %o2, 0x7, %o2
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1: subcc %o4, 0x8, %o4
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ldx [%o1], %o5
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stx %o5, [%o1 + %o3]
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bgu,pt %XCC, 1b
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add %o1, 0x8, %o1
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andcc %o2, 0x4, %g0
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be,pt %XCC, 1f
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nop
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sub %o2, 0x4, %o2
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lduw [%o1], %o5
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stw %o5, [%o1 + %o3]
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add %o1, 0x4, %o1
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1: cmp %o2, 0
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be,pt %XCC, out
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nop
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ba,pt %xcc, small_copy_unaligned
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nop
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small_copy: /* 0 < len <= 16 */
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andcc %o3, 0x3, %g0
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bne,pn %XCC, small_copy_unaligned
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sub %o0, %o1, %o3
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small_copy_aligned:
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subcc %o2, 4, %o2
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lduw [%o1], %g1
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stw %g1, [%o1 + %o3]
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bgu,pt %XCC, small_copy_aligned
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add %o1, 4, %o1
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out: retl
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mov %g5, %o0
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.align 32
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small_copy_unaligned:
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subcc %o2, 1, %o2
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ldub [%o1], %g1
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stb %g1, [%o1 + %o3]
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bgu,pt %XCC, small_copy_unaligned
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add %o1, 1, %o1
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retl
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mov %g5, %o0
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END(__memcpy_ultra3)
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#endif
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