From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: by sourceware.org (Postfix, from userid 1791) id 73A783858C33; Mon, 6 Feb 2023 20:14:27 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 73A783858C33 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=sourceware.org; s=default; t=1675714467; bh=U6Rjg8fEk6HKXxtRWlRZS9V4d3KIdxz+migrzV2FR88=; h=From:To:Subject:Date:From; b=bB3+lql2kqKIsJvrELsC91kWv/hwu4bbPS36jcgOM1KVsYnO1OlAR1Ua1wS1b/f/h Ec3c7ll3yWJ7RzkHMCE59ajcv1uIYgCzmgon27ve4PKpYk1fLRB+4CCL5WCCXQx+vh bmFHdQblHcdGIZkuXZ7H6ny07cS/qzLOk078Xq48= Content-Type: text/plain; charset="us-ascii" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit From: Adhemerval Zanella To: glibc-cvs@sourceware.org Subject: [glibc] alpha: Add string-fza, string-fzb.h, string-fzi.h, and string-shift.h X-Act-Checkin: glibc X-Git-Author: Richard Henderson X-Git-Refname: refs/heads/master X-Git-Oldrev: c62b1c29c2100f6d0bb8fe6d5e35811bd8ab49d9 X-Git-Newrev: 120ad6ed1ae72ed8bf46638c5a7bf6c3b239d4dc Message-Id: <20230206201427.73A783858C33@sourceware.org> Date: Mon, 6 Feb 2023 20:14:27 +0000 (GMT) List-Id: https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=120ad6ed1ae72ed8bf46638c5a7bf6c3b239d4dc commit 120ad6ed1ae72ed8bf46638c5a7bf6c3b239d4dc Author: Richard Henderson Date: Tue Jan 10 18:01:03 2023 -0300 alpha: Add string-fza, string-fzb.h, string-fzi.h, and string-shift.h While alpha has the more important string functions in assembly, there are still a few for find the generic routines are used. Use the CMPBGE insn, via the builtin, for testing of zeros. Use a simplified expansion of __builtin_ctz when the insn isn't available. Checked on alpha-linux-gnu. Co-authored-by: Adhemerval Zanella Reviewed-by: Adhemerval Zanella Diff: --- sysdeps/alpha/string-fza.h | 60 ++++++++++++++++++++++++++++++++++++++++++ sysdeps/alpha/string-fzb.h | 52 +++++++++++++++++++++++++++++++++++++ sysdeps/alpha/string-fzi.h | 62 ++++++++++++++++++++++++++++++++++++++++++++ sysdeps/alpha/string-shift.h | 44 +++++++++++++++++++++++++++++++ 4 files changed, 218 insertions(+) diff --git a/sysdeps/alpha/string-fza.h b/sysdeps/alpha/string-fza.h new file mode 100644 index 0000000000..b72ce8293c --- /dev/null +++ b/sysdeps/alpha/string-fza.h @@ -0,0 +1,60 @@ +/* Basic zero byte detection. Generic C version. + Copyright (C) 2023 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 + . */ + +#ifndef _STRING_FZA_H +#define _STRING_FZA_H 1 + +#include +#include + +/* The CMPBGE instruction creates a bit mask rather than a byte mask. + However, if we narrow find_t to either 'int' or 'uint8_t', we get + unnecessary truncation instructions from the 'unsigned long' type + returned by __builtin_alpha_cmpbge. */ +typedef op_t find_t; + +static __always_inline find_t +find_zero_all (op_t x) +{ + return __builtin_alpha_cmpbge (0, x); +} + +static __always_inline find_t +find_eq_all (op_t x1, op_t x2) +{ + return find_zero_all (x1 ^ x2); +} + +static __always_inline find_t +find_zero_eq_all (op_t x1, op_t x2) +{ + return find_zero_all (x1) | find_zero_all (x1 ^ x2); +} + +static __always_inline find_t +find_zero_ne_all (op_t x1, op_t x2) +{ + return find_zero_all (x1) | (find_zero_all (x1 ^ x2) ^ 0xff); +} + +/* Define the "inexact" versions in terms of the exact versions. */ +#define find_zero_low find_zero_all +#define find_eq_low find_eq_all +#define find_zero_eq_low find_zero_eq_all + +#endif /* _STRING_FZA_H */ diff --git a/sysdeps/alpha/string-fzb.h b/sysdeps/alpha/string-fzb.h new file mode 100644 index 0000000000..e3934ba413 --- /dev/null +++ b/sysdeps/alpha/string-fzb.h @@ -0,0 +1,52 @@ +/* Zero byte detection; boolean. Alpha version. + Copyright (C) 2023 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 + . */ + +#ifndef _STRING_FZB_H +#define _STRING_FZB_H 1 + +#include +#include + +/* Note that since CMPBGE creates a bit mask rather than a byte mask, + we cannot simply provide a target-specific string-fza.h. */ + +/* Determine if any byte within X is zero. This is a pure boolean test. */ + +static __always_inline _Bool +has_zero (op_t x) +{ + return __builtin_alpha_cmpbge (0, x) != 0; +} + +/* Likewise, but for byte equality between X1 and X2. */ + +static __always_inline _Bool +has_eq (op_t x1, op_t x2) +{ + return has_zero (x1 ^ x2); +} + +/* Likewise, but for zeros in X1 and equal bytes between X1 and X2. */ + +static __always_inline _Bool +has_zero_eq (op_t x1, op_t x2) +{ + return has_zero (x1) | has_eq (x1, x2); +} + +#endif /* _STRING_FZB_H */ diff --git a/sysdeps/alpha/string-fzi.h b/sysdeps/alpha/string-fzi.h new file mode 100644 index 0000000000..aba7ca4f3d --- /dev/null +++ b/sysdeps/alpha/string-fzi.h @@ -0,0 +1,62 @@ +/* string-fzi.h -- zero byte detection; indices. Alpha version. + Copyright (C) 2023 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 + . */ + +#ifndef _STRING_FZI_H +#define _STRING_FZI_H + +#include +#include +#include + +/* Note that since CMPBGE creates a bit mask rather than a byte mask, + we cannot simply provide a target-specific string-fza.h. */ + +/* A subroutine for the index_zero functions. Given a bitmask C, + return the index of the first bit set in memory order. */ +static __always_inline unsigned int +index_first (find_t c) +{ +#ifdef __alpha_cix__ + return __builtin_ctzl (c); +#else + c = c & -c; + return (c & 0xf0 ? 4 : 0) + (c & 0xcc ? 2 : 0) + (c & 0xaa ? 1 : 0); +#endif +} + +/* Similarly, but return the (memory order) index of the last bit + that is non-zero. Note that only the least 8 bits may be nonzero. */ + +static __always_inline unsigned int +index_last (find_t x) +{ +#ifdef __alpha_cix__ + return __builtin_clzl (x) ^ 63; +#else + unsigned r = 0; + if (x & 0xf0) + r += 4; + if (x & (0xc << r)) + r += 2; + if (x & (0x2 << r)) + r += 1; + return r; +#endif +} + +#endif /* _STRING_FZI_H */ diff --git a/sysdeps/alpha/string-shift.h b/sysdeps/alpha/string-shift.h new file mode 100644 index 0000000000..4e2cb2fea1 --- /dev/null +++ b/sysdeps/alpha/string-shift.h @@ -0,0 +1,44 @@ +/* Shift unaligned word read. Alpha version. + Copyright (C) 2023 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 + . */ + +#ifndef _STRING_SHIFT_H +#define _STRING_SHIFT_H 1 + +#include +#include +#include + +/* Return the mask WORD shifted based on S_INT address value, to ignore + values not presented in the aligned word read. */ +static __always_inline find_t +shift_find (find_t word, uintptr_t s) +{ + return word >> (s % sizeof (op_t)); +} + +/* Mask off the bits defined the the S alignment value. */ +static __always_inline find_t +shift_find_last (find_t word, uintptr_t s) +{ + s = s % sizeof (op_t); + if (s == 0) + return word; + return word & ~((op_t)-1 << s); +} + +#endif /* _STRING_SHIFT_H */