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author | Richard Henderson <richard.henderson@linaro.org> | 2023-01-10 18:01:03 -0300 |
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committer | Adhemerval Zanella <adhemerval.zanella@linaro.org> | 2023-02-06 16:19:35 -0300 |
commit | 120ad6ed1ae72ed8bf46638c5a7bf6c3b239d4dc (patch) | |
tree | 2aa344fe5bbbc8e3937e0ac1fd32bd48ce2205a1 /sysdeps/alpha/string-shift.h | |
parent | c62b1c29c2100f6d0bb8fe6d5e35811bd8ab49d9 (diff) | |
download | glibc-120ad6ed1ae72ed8bf46638c5a7bf6c3b239d4dc.tar.gz glibc-120ad6ed1ae72ed8bf46638c5a7bf6c3b239d4dc.tar.xz glibc-120ad6ed1ae72ed8bf46638c5a7bf6c3b239d4dc.zip |
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 <adhemerval.zanella@linaro.org> Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
Diffstat (limited to 'sysdeps/alpha/string-shift.h')
-rw-r--r-- | sysdeps/alpha/string-shift.h | 44 |
1 files changed, 44 insertions, 0 deletions
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 + <http://www.gnu.org/licenses/>. */ + +#ifndef _STRING_SHIFT_H +#define _STRING_SHIFT_H 1 + +#include <limits.h> +#include <stdint.h> +#include <string-fza.h> + +/* 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 */ |