From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: by sourceware.org (Postfix, from userid 1791) id ABD523858C52; Mon, 6 Feb 2023 20:14:37 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org ABD523858C52 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=sourceware.org; s=default; t=1675714477; bh=CAKip29m/9QGT2P/3yNlmStsw/oV7RAcka5B3ARWXK0=; h=From:To:Subject:Date:From; b=GelTjunEunzznw/QwDi49LSkmRtLfbM7h+5FdKzkmzP+I+7Xqt2zkGOHJ8uX/k6g9 kVN9nSn8KGZTNRv4OgJbLrH+AFOiuqtjExsccaBZ/MZNDUKYFT7+oVun4gNK2Q7NF+ kUV0gSnqFT0W+rubJ4DjSY31eJbqYIzr1aN/IYac= 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] powerpc: Add string-fza.h X-Act-Checkin: glibc X-Git-Author: Richard Henderson X-Git-Refname: refs/heads/master X-Git-Oldrev: 885306b2f68e4a82034cff420c8fc93c695f10bc X-Git-Newrev: 080685c90fcaa5c161fbc7264adcf0bccc905006 Message-Id: <20230206201437.ABD523858C52@sourceware.org> Date: Mon, 6 Feb 2023 20:14:37 +0000 (GMT) List-Id: https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=080685c90fcaa5c161fbc7264adcf0bccc905006 commit 080685c90fcaa5c161fbc7264adcf0bccc905006 Author: Richard Henderson Date: Tue Jan 10 18:01:05 2023 -0300 powerpc: Add string-fza.h While ppc has the more important string functions in assembly, there are still a few generic routines used. Use the Power 6 CMPB insn for testing of zeros. Checked on powerpc64le-linux-gnu. Reviewed-by: Adhemerval Zanella Diff: --- sysdeps/powerpc/string-fza.h | 71 ++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 71 insertions(+) diff --git a/sysdeps/powerpc/string-fza.h b/sysdeps/powerpc/string-fza.h new file mode 100644 index 0000000000..23e7ced5d7 --- /dev/null +++ b/sysdeps/powerpc/string-fza.h @@ -0,0 +1,71 @@ +/* Zero byte detection; basics. PowerPC 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 _POWERPC_STRING_FZA_H +#define _POWERPC_STRING_FZA_H 1 + +/* PowerISA 2.05 (POWER6) provides cmpb instruction. */ +#ifdef _ARCH_PWR6 +# include +# include + +/* The functions return a byte mask. */ +typedef op_t find_t; + +/* This function returns 0xff for each byte that is + equal between X1 and X2. */ + +static __always_inline find_t +find_eq_all (op_t x1, op_t x2) +{ + return __builtin_cmpb (x1, x2); +} + +/* This function returns 0xff for each byte that is zero in X. */ + +static __always_inline find_t +find_zero_all (op_t x) +{ + return find_eq_all (x, 0); +} + +/* Identify zero bytes in X1 or equality between X1 and X2. */ + +static __always_inline find_t +find_zero_eq_all (op_t x1, op_t x2) +{ + return find_zero_all (x1) | find_eq_all (x1, x2); +} + +/* Identify zero bytes in X1 or inequality between X1 and X2. */ + +static __always_inline find_t +find_zero_ne_all (op_t x1, op_t x2) +{ + return find_zero_all (x1) | ~find_eq_all (x1, x2); +} + +/* 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 +#else +# include +#endif /* _ARCH_PWR6 */ + +#endif /* _POWERPC_STRING_FZA_H */