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Diffstat (limited to 'sysdeps/tile/string-endian.h')
| -rw-r--r-- | sysdeps/tile/string-endian.h | 84 |
1 files changed, 84 insertions, 0 deletions
diff --git a/sysdeps/tile/string-endian.h b/sysdeps/tile/string-endian.h new file mode 100644 index 0000000000..09b57810df --- /dev/null +++ b/sysdeps/tile/string-endian.h @@ -0,0 +1,84 @@ +/* Copyright (C) 2011-2017 Free Software Foundation, Inc. + This file is part of the GNU C Library. + Contributed by Chris Metcalf <cmetcalf@tilera.com>, 2011. + + 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/>. */ + +#include <endian.h> +#include <stdint.h> + +/* Provide a set of macros to help keep endianness #ifdefs out of + the string functions. + + MASK: Provide a mask based on the pointer alignment that + sets up non-zero bytes before the beginning of the string. + The MASK expression works because shift counts are taken mod 64. + + NULMASK: Clear bytes beyond a given point in the string. + + CFZ: Find the first zero bit in the 8 string bytes in a long. + + REVCZ: Find the last zero bit in the 8 string bytes in a long. + + STRSHIFT: Shift N bits towards the start of the string. */ + +#if __BYTE_ORDER == __LITTLE_ENDIAN +#define MASK(x) (__insn_shl(1ULL, (x << 3)) - 1) +#define NULMASK(x) ((2ULL << x) - 1) +#define CFZ(x) __insn_ctz(x) +#define REVCZ(x) __insn_clz(x) +#define STRSHIFT(x,n) ((x) >> n) +#else +#define MASK(x) (__insn_shl(-2LL, ((-x << 3) - 1))) +#define NULMASK(x) (-2LL << (63 - x)) +#define CFZ(x) __insn_clz(x) +#define REVCZ(x) __insn_ctz(x) +#define STRSHIFT(x,n) ((x) << n) +#endif + +/* Create eight copies of the byte in a uint64_t. Byte Shuffle uses + the bytes of srcB as the index into the dest vector to select a + byte. With all indices of zero, the first byte is copied into all + the other bytes. */ +static inline uint64_t copy_byte(uint8_t byte) +{ + return __insn_shufflebytes(byte, 0, 0); +} + +/* Implement the byte vector instructions using extended assembly. + The __insn_OP() builtins are buggy in the upstream compiler; + see gcc bugzilla 78117. */ + +#define VECOP(OP) \ + static inline uint64_t OP (uint64_t a, uint64_t b) \ + { \ + uint64_t result; \ + asm volatile (#OP " %0, %1, %2" : "=r"(result) : "r"(a), "r"(b)); \ + return result; \ + } \ + \ + static inline uint64_t OP ## i (uint64_t a, uint64_t b) \ + { \ + uint64_t result; \ + asm volatile (#OP "i %0, %1, %2" : "=r"(result) : "r"(a), "I"(b)); \ + return result; \ + } + +VECOP(v1cmpeq) +VECOP(v1cmpltu) +VECOP(v1cmpne) +VECOP(v1add) +VECOP(v1shru) +VECOP(v1shl) |