From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: by sourceware.org (Postfix, from userid 1791) id B19C038543B3; Fri, 13 Jan 2023 20:03:50 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org B19C038543B3 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=sourceware.org; s=default; t=1673640230; bh=YC9r9XIsL1HTq1I1+v6L4K76ARoXmya8tBScyP+7b/0=; h=From:To:Subject:Date:From; b=IUYZi9VzNEIE7B+noNwm1QVny3TTfORKnho9t++dxRqoLEaQwXX2pSI/7rlG3njg5 XuPOU0uoEsXr4lYTBhdfTTZLfFZexIjjtFIpYcrx8/QnHYHDyNA5sQwJ8I4YoaV4Cz s48to3bVOvG24zZ+QjVXu+aXsmLqfQXWuc2AQUp4= 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/azanella/generic-strings] powerpc: Add string-fza.h X-Act-Checkin: glibc X-Git-Author: Richard Henderson X-Git-Refname: refs/heads/azanella/generic-strings X-Git-Oldrev: 9d18a422008a8d292bd12ad0fe7b1796a8c4cb03 X-Git-Newrev: a86c47f74ee2bbb1f2943ba1086a183aa29e59b0 Message-Id: <20230113200350.B19C038543B3@sourceware.org> Date: Fri, 13 Jan 2023 20:03:50 +0000 (GMT) List-Id: https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=a86c47f74ee2bbb1f2943ba1086a183aa29e59b0 commit a86c47f74ee2bbb1f2943ba1086a183aa29e59b0 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. Diff: --- sysdeps/powerpc/string-fza.h | 95 ++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 95 insertions(+) diff --git a/sysdeps/powerpc/string-fza.h b/sysdeps/powerpc/string-fza.h new file mode 100644 index 0000000000..13de16a004 --- /dev/null +++ b/sysdeps/powerpc/string-fza.h @@ -0,0 +1,95 @@ +/* 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 +# include +# include +# include + +/* The functions return a byte mask. */ +typedef op_t find_t; + +/* 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) +{ + if (__BYTE_ORDER == __LITTLE_ENDIAN) + return word >> (CHAR_BIT * (s % sizeof (op_t))); + else + return word << (CHAR_BIT * (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) +{ + return word & create_mask (s); +} + +/* 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) +{ + op_t ret; + asm ("cmpb %0,%1,%2" : "=r"(ret) : "r"(x1), "r"(x2)); + return ret; +} + +/* 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 +# define find_zero_ne_low find_zero_ne_all +#else +# include +#endif /* _ARCH_PWR6 */ + +#endif /* _POWERPC_STRING_FZA_H */