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author | Zack Weinberg <zackw@panix.com> | 2017-06-08 15:39:03 -0400 |
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committer | Zack Weinberg <zackw@panix.com> | 2017-06-08 15:39:03 -0400 |
commit | 5046dbb4a7eba5eccfd258f92f4735c9ffc8d069 (patch) | |
tree | 4470480d904b65cf14ca524f96f79eca818c3eaf /REORG.TODO/sysdeps/arm/memset.S | |
parent | 199fc19d3aaaf57944ef036e15904febe877fc93 (diff) | |
download | glibc-5046dbb4a7eba5eccfd258f92f4735c9ffc8d069.tar.gz glibc-5046dbb4a7eba5eccfd258f92f4735c9ffc8d069.tar.xz glibc-5046dbb4a7eba5eccfd258f92f4735c9ffc8d069.zip |
Prepare for radical source tree reorganization. zack/build-layout-experiment
All top-level files and directories are moved into a temporary storage directory, REORG.TODO, except for files that will certainly still exist in their current form at top level when we're done (COPYING, COPYING.LIB, LICENSES, NEWS, README), all old ChangeLog files (which are moved to the new directory OldChangeLogs, instead), and the generated file INSTALL (which is just deleted; in the new order, there will be no generated files checked into version control).
Diffstat (limited to 'REORG.TODO/sysdeps/arm/memset.S')
-rw-r--r-- | REORG.TODO/sysdeps/arm/memset.S | 69 |
1 files changed, 69 insertions, 0 deletions
diff --git a/REORG.TODO/sysdeps/arm/memset.S b/REORG.TODO/sysdeps/arm/memset.S new file mode 100644 index 0000000000..95946360bf --- /dev/null +++ b/REORG.TODO/sysdeps/arm/memset.S @@ -0,0 +1,69 @@ +/* Copyright (C) 1998-2017 Free Software Foundation, Inc. + This file is part of the GNU C Library. + Contributed by Philip Blundell <philb@gnu.org> + + 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/>. */ + +/* Thumb requires excessive IT insns here. */ +#define NO_THUMB +#include <sysdep.h> + + .text + .syntax unified + +/* void *memset (dstpp, c, len) */ + +ENTRY(memset) + mov r3, r0 + cmp r2, #8 + bcc 2f @ less than 8 bytes to move + +1: + tst r3, #3 @ aligned yet? + strbne r1, [r3], #1 + subne r2, r2, #1 + bne 1b + + and r1, r1, #255 @ clear any sign bits + orr r1, r1, r1, lsl $8 + orr r1, r1, r1, lsl $16 + mov ip, r1 + +1: + subs r2, r2, #8 + stmiacs r3!, {r1, ip} @ store up to 32 bytes per loop iteration + subscs r2, r2, #8 + stmiacs r3!, {r1, ip} + subscs r2, r2, #8 + stmiacs r3!, {r1, ip} + subscs r2, r2, #8 + stmiacs r3!, {r1, ip} + bcs 1b + + and r2, r2, #7 +2: + subs r2, r2, #1 @ store up to 4 bytes per loop iteration + strbcs r1, [r3], #1 + subscs r2, r2, #1 + strbcs r1, [r3], #1 + subscs r2, r2, #1 + strbcs r1, [r3], #1 + subscs r2, r2, #1 + strbcs r1, [r3], #1 + bcs 2b + + DO_RET(lr) +END(memset) +libc_hidden_builtin_def (memset) |