mirror of
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Optimize tile (mostly tilegx) memcpy and memmove performance.
- Override <memcopy.h> so we use full 8-byte word copies on tilegx32 for memmove, then use op_t in memcpy instead of the previous locally-defined word_t just to avoid proliferating identical types. - Fix bug in memcpy prefetch that caused us to never prefetch past the first cache line. - Optimize misaligned memcpy by inlining _wordcopy_fwd_dest_aligned instead of just doing a dumb word-at-a-time copy. - Make memcpy safe for forward copies by doing all the loads from a given cache line prior to doing a wh64 (cache line zero-fill) on the destination. Remove now-redundant src == dst check. - Copy and optimize the generic wordcopy.c routines to use the tile "double align" instruction instead of the MERGE macro; to avoid offset addressing mode (which tile doesn't have) by rewriting the pointer math to load and store with a zero index; and to use post-increment addresses in the inner loops to improve scheduling.
This commit is contained in:
Chris Metcalf
parent
82477c28f4
commit
cd84016efe
@ -1,3 +1,9 @@
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2012-11-02 Chris Metcalf <cmetcalf@tilera.com>
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* sysdeps/tile/tilegx/memcpy.c (__memcpy): Optimize.
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* sysdeps/tile/memcopy.h: New file.
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* sysdeps/tile/wordcopy.c: New file.
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2012-11-03 Joseph Myers <joseph@codesourcery.com>
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[BZ #3439]
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27
ports/sysdeps/tile/memcopy.h
Normal file
27
ports/sysdeps/tile/memcopy.h
Normal file
@ -0,0 +1,27 @@
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/* memcopy.h -- definitions for memory copy functions. Tile version.
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Copyright (C) 2012 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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<http://www.gnu.org/licenses/>. */
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#include <sysdeps/generic/memcopy.h>
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#include <bits/wordsize.h>
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/* Support more efficient copying on tilegx32, which supports
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long long as a native 64-bit type. */
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#if defined (__tilegx__) && __WORDSIZE == 32
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# undef op_t
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# define op_t unsigned long long int
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#endif
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@ -19,11 +19,9 @@
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#include <string.h>
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#include <stdint.h>
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#include <stdlib.h>
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#include <memcopy.h>
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#include <arch/chip.h>
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/* Must be 8 bytes in size. */
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#define word_t uint64_t
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/* How many cache lines ahead should we prefetch? */
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#define PREFETCH_LINES_AHEAD 3
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@ -34,8 +32,8 @@ __memcpy (void *__restrict dstv, const void *__restrict srcv, size_t n)
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const char *__restrict src1 = (const char *) srcv;
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const char *__restrict src1_end;
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const char *__restrict prefetch;
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word_t *__restrict dst8; /* 8-byte pointer to destination memory. */
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word_t final; /* Final bytes to write to trailing word, if any */
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op_t *__restrict dst8; /* 8-byte pointer to destination memory. */
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op_t final; /* Final bytes to write to trailing word, if any */
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long i;
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if (n < 16)
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@ -55,101 +53,169 @@ __memcpy (void *__restrict dstv, const void *__restrict srcv, size_t n)
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{
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__insn_prefetch (prefetch);
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prefetch += CHIP_L2_LINE_SIZE ();
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prefetch = (prefetch > src1_end) ? prefetch : src1;
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prefetch = (prefetch < src1_end) ? prefetch : src1;
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}
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/* Copy bytes until dst is word-aligned. */
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for (; (uintptr_t) dst1 & (sizeof (word_t) - 1); n--)
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for (; (uintptr_t) dst1 & (sizeof (op_t) - 1); n--)
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*dst1++ = *src1++;
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/* 8-byte pointer to destination memory. */
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dst8 = (word_t *) dst1;
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dst8 = (op_t *) dst1;
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if (__builtin_expect ((uintptr_t) src1 & (sizeof (word_t) - 1), 0))
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if (__builtin_expect ((uintptr_t) src1 & (sizeof (op_t) - 1), 0))
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{
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/* Misaligned copy. Copy 8 bytes at a time, but don't bother
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with other fanciness.
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TODO: Consider prefetching and using wh64 as well. */
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/* Misaligned copy. Use glibc's _wordcopy_fwd_dest_aligned, but
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inline it to avoid prologue/epilogue. TODO: Consider
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prefetching and using wh64 as well. */
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void * srci;
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op_t a0, a1, a2, a3;
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long int dstp = (long int) dst1;
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long int srcp = (long int) src1;
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long int len = n / OPSIZ;
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/* Create an aligned src8. */
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const word_t *__restrict src8 =
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(const word_t *) ((uintptr_t) src1 & -sizeof (word_t));
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word_t b;
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/* Save the initial source pointer so we know the number of
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bytes to shift for merging two unaligned results. */
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srci = (void *) srcp;
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word_t a = *src8++;
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for (; n >= sizeof (word_t); n -= sizeof (word_t))
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/* Make SRCP aligned by rounding it down to the beginning of the
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`op_t' it points in the middle of. */
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srcp &= -OPSIZ;
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switch (len % 4)
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{
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b = *src8++;
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a = __insn_dblalign (a, b, src1);
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*dst8++ = a;
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a = b;
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case 2:
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a1 = ((op_t *) srcp)[0];
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a2 = ((op_t *) srcp)[1];
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len += 2;
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srcp += 2 * OPSIZ;
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goto do1;
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case 3:
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a0 = ((op_t *) srcp)[0];
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a1 = ((op_t *) srcp)[1];
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len += 1;
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srcp += 2 * OPSIZ;
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goto do2;
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case 0:
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if (OP_T_THRES <= 3 * OPSIZ && len == 0)
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return dstv;
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a3 = ((op_t *) srcp)[0];
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a0 = ((op_t *) srcp)[1];
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len += 0;
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srcp += 2 * OPSIZ;
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goto do3;
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case 1:
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a2 = ((op_t *) srcp)[0];
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a3 = ((op_t *) srcp)[1];
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srcp += 2 * OPSIZ;
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len -= 1;
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if (OP_T_THRES <= 3 * OPSIZ && len == 0)
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goto do0;
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goto do4; /* No-op. */
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}
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do
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{
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do4:
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a0 = ((op_t *) srcp)[0];
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a2 = __insn_dblalign (a2, a3, srci);
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((op_t *) dstp)[0] = a2;
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srcp += OPSIZ;
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dstp += OPSIZ;
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do3:
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a1 = ((op_t *) srcp)[0];
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a3 = __insn_dblalign (a3, a0, srci);
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((op_t *) dstp)[0] = a3;
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srcp += OPSIZ;
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dstp += OPSIZ;
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do2:
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a2 = ((op_t *) srcp)[0];
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a0 = __insn_dblalign (a0, a1, srci);
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((op_t *) dstp)[0] = a0;
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srcp += OPSIZ;
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dstp += OPSIZ;
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do1:
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a3 = ((op_t *) srcp)[0];
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a1 = __insn_dblalign (a1, a2, srci);
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((op_t *) dstp)[0] = a1;
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srcp += OPSIZ;
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dstp += OPSIZ;
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len -= 4;
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}
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while (len != 0);
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/* This is the right position for do0. Please don't move
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it into the loop. */
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do0:
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((op_t *) dstp)[0] = __insn_dblalign (a2, a3, srci);
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n = n % OPSIZ;
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if (n == 0)
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return dstv;
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b = ((const char *) src8 <= src1_end) ? *src8 : 0;
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a0 = ((const char *) srcp <= src1_end) ? ((op_t *) srcp)[0] : 0;
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/* Final source bytes to write to trailing partial word, if any. */
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final = __insn_dblalign (a, b, src1);
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final = __insn_dblalign (a3, a0, srci);
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dst8 = (op_t *)(dstp + OPSIZ);
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}
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else
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{
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/* Aligned copy. */
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const word_t *__restrict src8 = (const word_t *) src1;
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const op_t *__restrict src8 = (const op_t *) src1;
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/* src8 and dst8 are both word-aligned. */
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if (n >= CHIP_L2_LINE_SIZE ())
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{
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/* Copy until 'dst' is cache-line-aligned. */
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for (; (uintptr_t) dst8 & (CHIP_L2_LINE_SIZE () - 1);
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n -= sizeof (word_t))
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n -= sizeof (op_t))
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*dst8++ = *src8++;
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/* If copying to self, return. The test is cheap enough
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that we do it despite the fact that the memcpy() contract
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doesn't require us to support overlapping dst and src.
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This is the most common case of overlap, and any close
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overlap will cause corruption due to the wh64 below.
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This case is particularly important since the compiler
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will emit memcpy() calls for aggregate copies even if it
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can't prove that src != dst. */
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if (__builtin_expect (dst8 == src8, 0))
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return dstv;
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for (; n >= CHIP_L2_LINE_SIZE ();)
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{
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__insn_wh64 (dst8);
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op_t tmp0, tmp1, tmp2, tmp3, tmp4, tmp5, tmp6, tmp7;
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/* Prefetch and advance to next line to prefetch, but
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don't go past the end. */
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__insn_prefetch (prefetch);
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prefetch += CHIP_L2_LINE_SIZE ();
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prefetch = (prefetch > src1_end) ? prefetch :
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prefetch = (prefetch < src1_end) ? prefetch :
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(const char *) src8;
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/* Copy an entire cache line. Manually unrolled to
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avoid idiosyncracies of compiler unrolling. */
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#define COPY_WORD(offset) ({ dst8[offset] = src8[offset]; n -= 8; })
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COPY_WORD (0);
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COPY_WORD (1);
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COPY_WORD (2);
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COPY_WORD (3);
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COPY_WORD (4);
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COPY_WORD (5);
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COPY_WORD (6);
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COPY_WORD (7);
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/* Do all the loads before wh64. This is necessary if
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[src8, src8+7] and [dst8, dst8+7] share the same
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cache line and dst8 <= src8, as can be the case when
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called from memmove, or with code tested on x86 whose
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memcpy always works with forward copies. */
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tmp0 = *src8++;
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tmp1 = *src8++;
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tmp2 = *src8++;
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tmp3 = *src8++;
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tmp4 = *src8++;
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tmp5 = *src8++;
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tmp6 = *src8++;
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tmp7 = *src8++;
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__insn_wh64 (dst8);
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*dst8++ = tmp0;
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*dst8++ = tmp1;
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*dst8++ = tmp2;
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*dst8++ = tmp3;
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*dst8++ = tmp4;
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*dst8++ = tmp5;
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*dst8++ = tmp6;
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*dst8++ = tmp7;
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n -= 64;
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}
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#if CHIP_L2_LINE_SIZE() != 64
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# error "Fix code that assumes particular L2 cache line size."
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#endif
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dst8 += CHIP_L2_LINE_SIZE () / sizeof (word_t);
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src8 += CHIP_L2_LINE_SIZE () / sizeof (word_t);
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}
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}
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for (; n >= sizeof (word_t); n -= sizeof (word_t))
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for (; n >= sizeof (op_t); n -= sizeof (op_t))
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*dst8++ = *src8++;
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if (__builtin_expect (n == 0, 1))
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449
ports/sysdeps/tile/wordcopy.c
Normal file
449
ports/sysdeps/tile/wordcopy.c
Normal file
@ -0,0 +1,449 @@
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/* wordcopy.c -- subroutines for memory copy functions. Tile version.
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Copyright (C) 1991-2012 Free Software Foundation, Inc.
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||||
This file is part of the GNU C Library.
|
||||
|
||||
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, see
|
||||
<http://www.gnu.org/licenses/>. */
|
||||
|
||||
/* To optimize for tile, we make the following changes from the
|
||||
default glibc version:
|
||||
- Use the double align instruction instead of the MERGE macro.
|
||||
- Since we don't have offset addressing mode, make sure the loads /
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||||
stores in the inner loop always have indices of 0.
|
||||
- Use post-increment addresses in the inner loops, which yields
|
||||
better scheduling. */
|
||||
|
||||
/* BE VERY CAREFUL IF YOU CHANGE THIS CODE...! */
|
||||
|
||||
#include <stddef.h>
|
||||
#include <memcopy.h>
|
||||
|
||||
/* Provide the appropriate dblalign builtin to shift two registers
|
||||
based on the alignment of a pointer held in a third register. */
|
||||
#ifdef __tilegx__
|
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#define DBLALIGN __insn_dblalign
|
||||
#else
|
||||
#define DBLALIGN __insn_dword_align
|
||||
#endif
|
||||
|
||||
/* _wordcopy_fwd_aligned -- Copy block beginning at SRCP to
|
||||
block beginning at DSTP with LEN `op_t' words (not LEN bytes!).
|
||||
Both SRCP and DSTP should be aligned for memory operations on `op_t's. */
|
||||
|
||||
void
|
||||
_wordcopy_fwd_aligned (dstp, srcp, len)
|
||||
long int dstp;
|
||||
long int srcp;
|
||||
size_t len;
|
||||
{
|
||||
op_t a0, a1;
|
||||
|
||||
switch (len % 8)
|
||||
{
|
||||
case 2:
|
||||
a0 = ((op_t *) srcp)[0];
|
||||
srcp += OPSIZ;
|
||||
len += 6;
|
||||
goto do1;
|
||||
case 3:
|
||||
a1 = ((op_t *) srcp)[0];
|
||||
srcp += OPSIZ;
|
||||
len += 5;
|
||||
goto do2;
|
||||
case 4:
|
||||
a0 = ((op_t *) srcp)[0];
|
||||
srcp += OPSIZ;
|
||||
len += 4;
|
||||
goto do3;
|
||||
case 5:
|
||||
a1 = ((op_t *) srcp)[0];
|
||||
srcp += OPSIZ;
|
||||
len += 3;
|
||||
goto do4;
|
||||
case 6:
|
||||
a0 = ((op_t *) srcp)[0];
|
||||
srcp += OPSIZ;
|
||||
len += 2;
|
||||
goto do5;
|
||||
case 7:
|
||||
a1 = ((op_t *) srcp)[0];
|
||||
srcp += OPSIZ;
|
||||
len += 1;
|
||||
goto do6;
|
||||
|
||||
case 0:
|
||||
if (OP_T_THRES <= 3 * OPSIZ && len == 0)
|
||||
return;
|
||||
a0 = ((op_t *) srcp)[0];
|
||||
srcp += OPSIZ;
|
||||
goto do7;
|
||||
case 1:
|
||||
a1 = ((op_t *) srcp)[0];
|
||||
srcp += OPSIZ;
|
||||
len -= 1;
|
||||
if (OP_T_THRES <= 3 * OPSIZ && len == 0)
|
||||
goto do0;
|
||||
goto do8; /* No-op. */
|
||||
}
|
||||
|
||||
do
|
||||
{
|
||||
do8:
|
||||
a0 = ((op_t *) srcp)[0];
|
||||
((op_t *) dstp)[0] = a1;
|
||||
srcp += OPSIZ;
|
||||
dstp += OPSIZ;
|
||||
do7:
|
||||
a1 = ((op_t *) srcp)[0];
|
||||
((op_t *) dstp)[0] = a0;
|
||||
srcp += OPSIZ;
|
||||
dstp += OPSIZ;
|
||||
do6:
|
||||
a0 = ((op_t *) srcp)[0];
|
||||
((op_t *) dstp)[0] = a1;
|
||||
srcp += OPSIZ;
|
||||
dstp += OPSIZ;
|
||||
do5:
|
||||
a1 = ((op_t *) srcp)[0];
|
||||
((op_t *) dstp)[0] = a0;
|
||||
srcp += OPSIZ;
|
||||
dstp += OPSIZ;
|
||||
do4:
|
||||
a0 = ((op_t *) srcp)[0];
|
||||
((op_t *) dstp)[0] = a1;
|
||||
srcp += OPSIZ;
|
||||
dstp += OPSIZ;
|
||||
do3:
|
||||
a1 = ((op_t *) srcp)[0];
|
||||
((op_t *) dstp)[0] = a0;
|
||||
srcp += OPSIZ;
|
||||
dstp += OPSIZ;
|
||||
do2:
|
||||
a0 = ((op_t *) srcp)[0];
|
||||
((op_t *) dstp)[0] = a1;
|
||||
srcp += OPSIZ;
|
||||
dstp += OPSIZ;
|
||||
do1:
|
||||
a1 = ((op_t *) srcp)[0];
|
||||
((op_t *) dstp)[0] = a0;
|
||||
srcp += OPSIZ;
|
||||
dstp += OPSIZ;
|
||||
|
||||
len -= 8;
|
||||
}
|
||||
while (len != 0);
|
||||
|
||||
/* This is the right position for do0. Please don't move
|
||||
it into the loop. */
|
||||
do0:
|
||||
((op_t *) dstp)[0] = a1;
|
||||
}
|
||||
|
||||
/* _wordcopy_fwd_dest_aligned -- Copy block beginning at SRCP to
|
||||
block beginning at DSTP with LEN `op_t' words (not LEN bytes!).
|
||||
DSTP should be aligned for memory operations on `op_t's, but SRCP must
|
||||
*not* be aligned. */
|
||||
|
||||
void
|
||||
_wordcopy_fwd_dest_aligned (dstp, srcp, len)
|
||||
long int dstp;
|
||||
long int srcp;
|
||||
size_t len;
|
||||
{
|
||||
void * srci;
|
||||
op_t a0, a1, a2, a3;
|
||||
|
||||
/* Save the initial source pointer so we know the number of bytes to
|
||||
shift for merging two unaligned results. */
|
||||
srci = (void *) srcp;
|
||||
|
||||
/* Make SRCP aligned by rounding it down to the beginning of the `op_t'
|
||||
it points in the middle of. */
|
||||
srcp &= -OPSIZ;
|
||||
|
||||
switch (len % 4)
|
||||
{
|
||||
case 2:
|
||||
a1 = ((op_t *) srcp)[0];
|
||||
a2 = ((op_t *) srcp)[1];
|
||||
len += 2;
|
||||
srcp += 2 * OPSIZ;
|
||||
goto do1;
|
||||
case 3:
|
||||
a0 = ((op_t *) srcp)[0];
|
||||
a1 = ((op_t *) srcp)[1];
|
||||
len += 1;
|
||||
srcp += 2 * OPSIZ;
|
||||
goto do2;
|
||||
case 0:
|
||||
if (OP_T_THRES <= 3 * OPSIZ && len == 0)
|
||||
return;
|
||||
a3 = ((op_t *) srcp)[0];
|
||||
a0 = ((op_t *) srcp)[1];
|
||||
len += 0;
|
||||
srcp += 2 * OPSIZ;
|
||||
goto do3;
|
||||
case 1:
|
||||
a2 = ((op_t *) srcp)[0];
|
||||
a3 = ((op_t *) srcp)[1];
|
||||
srcp += 2 * OPSIZ;
|
||||
len -= 1;
|
||||
if (OP_T_THRES <= 3 * OPSIZ && len == 0)
|
||||
goto do0;
|
||||
goto do4; /* No-op. */
|
||||
}
|
||||
|
||||
do
|
||||
{
|
||||
do4:
|
||||
a0 = ((op_t *) srcp)[0];
|
||||
a2 = DBLALIGN (a2, a3, srci);
|
||||
((op_t *) dstp)[0] = a2;
|
||||
srcp += OPSIZ;
|
||||
dstp += OPSIZ;
|
||||
do3:
|
||||
a1 = ((op_t *) srcp)[0];
|
||||
a3 = DBLALIGN (a3, a0, srci);
|
||||
((op_t *) dstp)[0] = a3;
|
||||
srcp += OPSIZ;
|
||||
dstp += OPSIZ;
|
||||
do2:
|
||||
a2 = ((op_t *) srcp)[0];
|
||||
a0 = DBLALIGN (a0, a1, srci);
|
||||
((op_t *) dstp)[0] = a0;
|
||||
srcp += OPSIZ;
|
||||
dstp += OPSIZ;
|
||||
do1:
|
||||
a3 = ((op_t *) srcp)[0];
|
||||
a1 = DBLALIGN (a1, a2, srci);
|
||||
((op_t *) dstp)[0] = a1;
|
||||
srcp += OPSIZ;
|
||||
dstp += OPSIZ;
|
||||
len -= 4;
|
||||
}
|
||||
while (len != 0);
|
||||
|
||||
/* This is the right position for do0. Please don't move
|
||||
it into the loop. */
|
||||
do0:
|
||||
((op_t *) dstp)[0] = DBLALIGN (a2, a3, srci);
|
||||
}
|
||||
|
||||
/* _wordcopy_bwd_aligned -- Copy block finishing right before
|
||||
SRCP to block finishing right before DSTP with LEN `op_t' words
|
||||
(not LEN bytes!). Both SRCP and DSTP should be aligned for memory
|
||||
operations on `op_t's. */
|
||||
|
||||
void
|
||||
_wordcopy_bwd_aligned (dstp, srcp, len)
|
||||
long int dstp;
|
||||
long int srcp;
|
||||
size_t len;
|
||||
{
|
||||
op_t a0, a1;
|
||||
long int srcp1;
|
||||
|
||||
srcp1 = srcp - 1 * OPSIZ;
|
||||
srcp -= 2 * OPSIZ;
|
||||
dstp -= 1 * OPSIZ;
|
||||
|
||||
switch (len % 8)
|
||||
{
|
||||
case 2:
|
||||
a0 = ((op_t *) srcp1)[0];
|
||||
len += 6;
|
||||
goto do1;
|
||||
case 3:
|
||||
a1 = ((op_t *) srcp1)[0];
|
||||
len += 5;
|
||||
goto do2;
|
||||
case 4:
|
||||
a0 = ((op_t *) srcp1)[0];
|
||||
len += 4;
|
||||
goto do3;
|
||||
case 5:
|
||||
a1 = ((op_t *) srcp1)[0];
|
||||
len += 3;
|
||||
goto do4;
|
||||
case 6:
|
||||
a0 = ((op_t *) srcp1)[0];
|
||||
len += 2;
|
||||
goto do5;
|
||||
case 7:
|
||||
a1 = ((op_t *) srcp1)[0];
|
||||
len += 1;
|
||||
goto do6;
|
||||
|
||||
case 0:
|
||||
if (OP_T_THRES <= 3 * OPSIZ && len == 0)
|
||||
return;
|
||||
a0 = ((op_t *) srcp1)[0];
|
||||
goto do7;
|
||||
case 1:
|
||||
a1 = ((op_t *) srcp1)[0];
|
||||
len -= 1;
|
||||
if (OP_T_THRES <= 3 * OPSIZ && len == 0)
|
||||
goto do0;
|
||||
goto do8; /* No-op. */
|
||||
}
|
||||
|
||||
do
|
||||
{
|
||||
do8:
|
||||
a0 = ((op_t *) srcp)[0];
|
||||
((op_t *) dstp)[0] = a1;
|
||||
srcp -= OPSIZ;
|
||||
dstp -= OPSIZ;
|
||||
do7:
|
||||
a1 = ((op_t *) srcp)[0];
|
||||
((op_t *) dstp)[0] = a0;
|
||||
srcp -= OPSIZ;
|
||||
dstp -= OPSIZ;
|
||||
do6:
|
||||
a0 = ((op_t *) srcp)[0];
|
||||
((op_t *) dstp)[0] = a1;
|
||||
srcp -= OPSIZ;
|
||||
dstp -= OPSIZ;
|
||||
do5:
|
||||
a1 = ((op_t *) srcp)[0];
|
||||
((op_t *) dstp)[0] = a0;
|
||||
srcp -= OPSIZ;
|
||||
dstp -= OPSIZ;
|
||||
do4:
|
||||
a0 = ((op_t *) srcp)[0];
|
||||
((op_t *) dstp)[0] = a1;
|
||||
srcp -= OPSIZ;
|
||||
dstp -= OPSIZ;
|
||||
do3:
|
||||
a1 = ((op_t *) srcp)[0];
|
||||
((op_t *) dstp)[0] = a0;
|
||||
srcp -= OPSIZ;
|
||||
dstp -= OPSIZ;
|
||||
do2:
|
||||
a0 = ((op_t *) srcp)[0];
|
||||
((op_t *) dstp)[0] = a1;
|
||||
srcp -= OPSIZ;
|
||||
dstp -= OPSIZ;
|
||||
do1:
|
||||
a1 = ((op_t *) srcp)[0];
|
||||
((op_t *) dstp)[0] = a0;
|
||||
srcp -= OPSIZ;
|
||||
dstp -= OPSIZ;
|
||||
|
||||
len -= 8;
|
||||
}
|
||||
while (len != 0);
|
||||
|
||||
/* This is the right position for do0. Please don't move
|
||||
it into the loop. */
|
||||
do0:
|
||||
((op_t *) dstp)[0] = a1;
|
||||
}
|
||||
|
||||
/* _wordcopy_bwd_dest_aligned -- Copy block finishing right
|
||||
before SRCP to block finishing right before DSTP with LEN `op_t'
|
||||
words (not LEN bytes!). DSTP should be aligned for memory
|
||||
operations on `op_t', but SRCP must *not* be aligned. */
|
||||
|
||||
void
|
||||
_wordcopy_bwd_dest_aligned (dstp, srcp, len)
|
||||
long int dstp;
|
||||
long int srcp;
|
||||
size_t len;
|
||||
{
|
||||
void * srci;
|
||||
op_t a0, a1, a2, a3;
|
||||
op_t b0, b1, b2, b3;
|
||||
|
||||
/* Save the initial source pointer so we know the number of bytes to
|
||||
shift for merging two unaligned results. */
|
||||
srci = (void *) srcp;
|
||||
|
||||
/* Make SRCP aligned by rounding it down to the beginning of the op_t
|
||||
it points in the middle of. */
|
||||
srcp &= -OPSIZ;
|
||||
srcp += OPSIZ;
|
||||
|
||||
switch (len % 4)
|
||||
{
|
||||
case 2:
|
||||
srcp -= 3 * OPSIZ;
|
||||
dstp -= 1 * OPSIZ;
|
||||
b2 = ((op_t *) srcp)[2];
|
||||
b1 = a1 = ((op_t *) srcp)[1];
|
||||
len += 2;
|
||||
goto do1;
|
||||
case 3:
|
||||
srcp -= 3 * OPSIZ;
|
||||
dstp -= 1 * OPSIZ;
|
||||
b3 = ((op_t *) srcp)[2];
|
||||
b2 = a2 = ((op_t *) srcp)[1];
|
||||
len += 1;
|
||||
goto do2;
|
||||
case 0:
|
||||
if (OP_T_THRES <= 3 * OPSIZ && len == 0)
|
||||
return;
|
||||
srcp -= 3 * OPSIZ;
|
||||
dstp -= 1 * OPSIZ;
|
||||
b0 = ((op_t *) srcp)[2];
|
||||
b3 = a3 = ((op_t *) srcp)[1];
|
||||
goto do3;
|
||||
case 1:
|
||||
srcp -= 3 * OPSIZ;
|
||||
dstp -= 1 * OPSIZ;
|
||||
b1 = ((op_t *) srcp)[2];
|
||||
b0 = a0 = ((op_t *) srcp)[1];
|
||||
len -= 1;
|
||||
if (OP_T_THRES <= 3 * OPSIZ && len == 0)
|
||||
goto do0;
|
||||
goto do4; /* No-op. */
|
||||
}
|
||||
|
||||
do
|
||||
{
|
||||
do4:
|
||||
b3 = a3 = ((op_t *) srcp)[0];
|
||||
a0 = DBLALIGN (a0, b1, srci);
|
||||
((op_t *) dstp)[0] = a0;
|
||||
srcp -= OPSIZ;
|
||||
dstp -= OPSIZ;
|
||||
do3:
|
||||
b2 = a2 = ((op_t *) srcp)[0];
|
||||
a3 = DBLALIGN (a3, b0, srci);
|
||||
((op_t *) dstp)[0] = a3;
|
||||
srcp -= OPSIZ;
|
||||
dstp -= OPSIZ;
|
||||
do2:
|
||||
b1 = a1 = ((op_t *) srcp)[0];
|
||||
a2 = DBLALIGN (a2, b3, srci);
|
||||
((op_t *) dstp)[0] = a2;
|
||||
srcp -= OPSIZ;
|
||||
dstp -= OPSIZ;
|
||||
do1:
|
||||
b0 = a0 = ((op_t *) srcp)[0];
|
||||
a1 = DBLALIGN (a1, b2, srci);
|
||||
((op_t *) dstp)[0] = a1;
|
||||
srcp -= OPSIZ;
|
||||
dstp -= OPSIZ;
|
||||
|
||||
len -= 4;
|
||||
}
|
||||
while (len != 0);
|
||||
|
||||
/* This is the right position for do0. Please don't move
|
||||
it into the loop. */
|
||||
do0:
|
||||
a0 = DBLALIGN (a0, b1, srci);
|
||||
((op_t *) dstp)[0] = a0;
|
||||
}
|
||||
Loading…
Reference in New Issue
Block a user