diff options
Diffstat (limited to 'ports/sysdeps/arm/armv6t2/strlen.S')
| -rw-r--r-- | ports/sysdeps/arm/armv6t2/strlen.S | 169 |
1 files changed, 0 insertions, 169 deletions
diff --git a/ports/sysdeps/arm/armv6t2/strlen.S b/ports/sysdeps/arm/armv6t2/strlen.S deleted file mode 100644 index 1706f6c6b8..0000000000 --- a/ports/sysdeps/arm/armv6t2/strlen.S +++ /dev/null @@ -1,169 +0,0 @@ -/* Copyright (C) 2010-2014 Free Software Foundation, Inc. - 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/>. */ - -/* - Assumes: - ARMv6T2, AArch32 - - */ - -#include <arm-features.h> /* This might #define NO_THUMB. */ -#include <sysdep.h> - -#ifdef __ARMEB__ -#define S2LO lsl -#define S2HI lsr -#else -#define S2LO lsr -#define S2HI lsl -#endif - -#ifndef NO_THUMB -/* This code is best on Thumb. */ - .thumb -#else -/* Using bne.w explicitly is desirable in Thumb mode because it helps - align the following label without a nop. In ARM mode there is no - such difference. */ -.macro bne.w label - bne \label -.endm - -/* This clobbers the condition codes, which the real Thumb cbnz instruction - does not do. But it doesn't matter for any of the uses here. */ -.macro cbnz reg, label - cmp \reg, #0 - bne \label -.endm -#endif - -/* Parameters and result. */ -#define srcin r0 -#define result r0 - -/* Internal variables. */ -#define src r1 -#define data1a r2 -#define data1b r3 -#define const_m1 r12 -#define const_0 r4 -#define tmp1 r4 /* Overlaps const_0 */ -#define tmp2 r5 - - .text - .p2align 6 -ENTRY(strlen) - sfi_pld srcin, #0 - strd r4, r5, [sp, #-8]! - cfi_adjust_cfa_offset (8) - cfi_rel_offset (r4, 0) - cfi_rel_offset (r5, 4) - cfi_remember_state - bic src, srcin, #7 - mvn const_m1, #0 - ands tmp1, srcin, #7 /* (8 - bytes) to alignment. */ - sfi_pld src, #32 - bne.w .Lmisaligned8 - mov const_0, #0 - mov result, #-8 -.Lloop_aligned: - /* Bytes 0-7. */ - sfi_breg src, \ - ldrd data1a, data1b, [\B] - sfi_pld src, #64 - add result, result, #8 -.Lstart_realigned: - uadd8 data1a, data1a, const_m1 /* Saturating GE<0:3> set. */ - sel data1a, const_0, const_m1 /* Select based on GE<0:3>. */ - uadd8 data1b, data1b, const_m1 - sel data1b, data1a, const_m1 /* Only used if d1a == 0. */ - cbnz data1b, .Lnull_found - - /* Bytes 8-15. */ - sfi_breg src, \ - ldrd data1a, data1b, [\B, #8] - uadd8 data1a, data1a, const_m1 /* Saturating GE<0:3> set. */ - add result, result, #8 - sel data1a, const_0, const_m1 /* Select based on GE<0:3>. */ - uadd8 data1b, data1b, const_m1 - sel data1b, data1a, const_m1 /* Only used if d1a == 0. */ - cbnz data1b, .Lnull_found - - /* Bytes 16-23. */ - sfi_breg src, \ - ldrd data1a, data1b, [\B, #16] - uadd8 data1a, data1a, const_m1 /* Saturating GE<0:3> set. */ - add result, result, #8 - sel data1a, const_0, const_m1 /* Select based on GE<0:3>. */ - uadd8 data1b, data1b, const_m1 - sel data1b, data1a, const_m1 /* Only used if d1a == 0. */ - cbnz data1b, .Lnull_found - - /* Bytes 24-31. */ - sfi_breg src, \ - ldrd data1a, data1b, [\B, #24] - add src, src, #32 - uadd8 data1a, data1a, const_m1 /* Saturating GE<0:3> set. */ - add result, result, #8 - sel data1a, const_0, const_m1 /* Select based on GE<0:3>. */ - uadd8 data1b, data1b, const_m1 - sel data1b, data1a, const_m1 /* Only used if d1a == 0. */ - cmp data1b, #0 - beq .Lloop_aligned - -.Lnull_found: - cmp data1a, #0 - itt eq - addeq result, result, #4 - moveq data1a, data1b -#ifndef __ARMEB__ - rev data1a, data1a -#endif - clz data1a, data1a - ldrd r4, r5, [sp], #8 - cfi_adjust_cfa_offset (-8) - cfi_restore (r4) - cfi_restore (r5) - add result, result, data1a, lsr #3 /* Bits -> Bytes. */ - DO_RET(lr) - -.Lmisaligned8: - cfi_restore_state - sfi_breg src, \ - ldrd data1a, data1b, [\B] - and tmp2, tmp1, #3 - rsb result, tmp1, #0 - lsl tmp2, tmp2, #3 /* Bytes -> bits. */ - tst tmp1, #4 - sfi_pld src, #64 - S2HI tmp2, const_m1, tmp2 -#ifdef NO_THUMB - mvn tmp1, tmp2 - orr data1a, data1a, tmp1 - itt ne - orrne data1b, data1b, tmp1 -#else - orn data1a, data1a, tmp2 - itt ne - ornne data1b, data1b, tmp2 -#endif - movne data1a, const_m1 - mov const_0, #0 - b .Lstart_realigned - -END(strlen) -libc_hidden_builtin_def (strlen) |