/**************************************************************************** * libs/libc/machine/arm64/gnu/arch_strrchr.S * * Copyright (c) 2014, ARM Limited * All rights Reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions are met: * * Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * * Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * Neither the name of the company nor the names of its contributors * may be used to endorse or promote products derived from this * software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT * HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. * ****************************************************************************/ #include "libc.h" #ifdef LIBC_BUILD_STRRCHR /* Assumptions: * * ARMv8-a, AArch64 * Neon Available. */ /* Arguments and results. */ #define srcin x0 #define chrin w1 #define result x0 #define src x2 #define tmp1 x3 #define wtmp2 w4 #define tmp3 x5 #define src_match x6 #define src_offset x7 #define const_m1 x8 #define tmp4 x9 #define nul_match x10 #define chr_match x11 #define vrepchr v0 #define vdata1 v1 #define vdata2 v2 #define vhas_nul1 v3 #define vhas_nul2 v4 #define vhas_chr1 v5 #define vhas_chr2 v6 #define vrepmask_0 v7 #define vrepmask_c v16 #define vend1 v17 #define vend2 v18 /* Core algorithm. For each 32-byte hunk we calculate a 64-bit syndrome value, with two bits per byte (LSB is always in bits 0 and 1, for both big and little-endian systems). For each tuple, bit 0 is set iff the relevant byte matched the requested character; bit 1 is set iff the relevant byte matched the NUL end of string (we trigger off bit0 for the special case of looking for NUL). Since the bits in the syndrome reflect exactly the order in which things occur in the original string a count_trailing_zeros() operation will identify exactly which byte is causing the termination, and why. */ /* Locals and temporaries. */ .macro def_fn f p2align=0 .text .p2align \p2align .global \f .type \f, %function \f: .endm def_fn strrchr /* Magic constant 0x40100401 to allow us to identify which lane matches the requested byte. Magic constant 0x80200802 used similarly for NUL termination. */ mov wtmp2, #0x0401 movk wtmp2, #0x4010, lsl #16 dup vrepchr.16b, chrin bic src, srcin, #31 /* Work with aligned 32-byte hunks. */ dup vrepmask_c.4s, wtmp2 mov src_offset, #0 ands tmp1, srcin, #31 add vrepmask_0.4s, vrepmask_c.4s, vrepmask_c.4s /* equiv: lsl #1 */ b.eq .Laligned /* Input string is not 32-byte aligned. Rather than forcing the padding bytes to a safe value, we calculate the syndrome for all the bytes, but then mask off those bits of the syndrome that are related to the padding. */ ld1 {vdata1.16b, vdata2.16b}, [src], #32 neg tmp1, tmp1 cmeq vhas_nul1.16b, vdata1.16b, #0 cmeq vhas_chr1.16b, vdata1.16b, vrepchr.16b cmeq vhas_nul2.16b, vdata2.16b, #0 cmeq vhas_chr2.16b, vdata2.16b, vrepchr.16b and vhas_nul1.16b, vhas_nul1.16b, vrepmask_0.16b and vhas_chr1.16b, vhas_chr1.16b, vrepmask_c.16b and vhas_nul2.16b, vhas_nul2.16b, vrepmask_0.16b and vhas_chr2.16b, vhas_chr2.16b, vrepmask_c.16b addp vhas_nul1.16b, vhas_nul1.16b, vhas_nul2.16b // 256->128 addp vhas_chr1.16b, vhas_chr1.16b, vhas_chr2.16b // 256->128 addp vhas_nul1.16b, vhas_nul1.16b, vhas_nul1.16b // 128->64 addp vhas_chr1.16b, vhas_chr1.16b, vhas_chr1.16b // 128->64 mov nul_match, vhas_nul1.2d[0] lsl tmp1, tmp1, #1 mov const_m1, #~0 mov chr_match, vhas_chr1.2d[0] lsr tmp3, const_m1, tmp1 bic nul_match, nul_match, tmp3 // Mask padding bits. bic chr_match, chr_match, tmp3 // Mask padding bits. cbnz nul_match, .Ltail .Lloop: cmp chr_match, #0 csel src_match, src, src_match, ne csel src_offset, chr_match, src_offset, ne .Laligned: ld1 {vdata1.16b, vdata2.16b}, [src], #32 cmeq vhas_nul1.16b, vdata1.16b, #0 cmeq vhas_chr1.16b, vdata1.16b, vrepchr.16b cmeq vhas_nul2.16b, vdata2.16b, #0 cmeq vhas_chr2.16b, vdata2.16b, vrepchr.16b addp vend1.16b, vhas_nul1.16b, vhas_nul2.16b // 256->128 and vhas_chr1.16b, vhas_chr1.16b, vrepmask_c.16b and vhas_chr2.16b, vhas_chr2.16b, vrepmask_c.16b addp vhas_chr1.16b, vhas_chr1.16b, vhas_chr2.16b // 256->128 addp vend1.16b, vend1.16b, vend1.16b // 128->64 addp vhas_chr1.16b, vhas_chr1.16b, vhas_chr1.16b // 128->64 mov nul_match, vend1.2d[0] mov chr_match, vhas_chr1.2d[0] cbz nul_match, .Lloop and vhas_nul1.16b, vhas_nul1.16b, vrepmask_0.16b and vhas_nul2.16b, vhas_nul2.16b, vrepmask_0.16b addp vhas_nul1.16b, vhas_nul1.16b, vhas_nul2.16b addp vhas_nul1.16b, vhas_nul1.16b, vhas_nul1.16b mov nul_match, vhas_nul1.2d[0] .Ltail: /* Work out exactly where the string ends. */ sub tmp4, nul_match, #1 eor tmp4, tmp4, nul_match ands chr_match, chr_match, tmp4 /* And pick the values corresponding to the last match. */ csel src_match, src, src_match, ne csel src_offset, chr_match, src_offset, ne /* Count down from the top of the syndrome to find the last match. */ clz tmp3, src_offset /* Src_match points beyond the word containing the match, so we can simply subtract half the bit-offset into the syndrome. Because we are counting down, we need to go back one more character. */ add tmp3, tmp3, #2 sub result, src_match, tmp3, lsr #1 /* But if the syndrome shows no match was found, then return NULL. */ cmp src_offset, #0 csel result, result, xzr, ne ret .size strrchr, . - strrchr #endif