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author | Richard Henderson <richard.henderson@linaro.org> | 2023-01-10 18:01:05 -0300 |
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committer | Adhemerval Zanella <adhemerval.zanella@linaro.org> | 2023-02-06 16:19:35 -0300 |
commit | 080685c90fcaa5c161fbc7264adcf0bccc905006 (patch) | |
tree | 1a5fe9cc229cccf01d4c36503e9d72f1df0b9d30 /sysdeps/powerpc | |
parent | 885306b2f68e4a82034cff420c8fc93c695f10bc (diff) | |
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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 <adhemerval.zanella@linaro.org>
Diffstat (limited to 'sysdeps/powerpc')
-rw-r--r-- | sysdeps/powerpc/string-fza.h | 71 |
1 files changed, 71 insertions, 0 deletions
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 + <http://www.gnu.org/licenses/>. */ + +#ifndef _POWERPC_STRING_FZA_H +#define _POWERPC_STRING_FZA_H 1 + +/* PowerISA 2.05 (POWER6) provides cmpb instruction. */ +#ifdef _ARCH_PWR6 +# include <string-misc.h> +# include <string-optype.h> + +/* 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 <sysdeps/generic/string-fza.h> +#endif /* _ARCH_PWR6 */ + +#endif /* _POWERPC_STRING_FZA_H */ |