mirror of
https://github.com/matrix-construct/construct
synced 2024-09-07 09:15:19 +02:00
163 lines
3.8 KiB
C++
163 lines
3.8 KiB
C++
// Matrix Construct
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//
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// Copyright (C) Matrix Construct Developers, Authors & Contributors
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// Copyright (C) 2016-2021 Jason Volk <jason@zemos.net>
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//
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// Permission to use, copy, modify, and/or distribute this software for any
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// purpose with or without fee is hereby granted, provided that the above
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// copyright notice and this permission notice is present in all copies. The
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// full license for this software is available in the LICENSE file.
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#pragma once
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#define HAVE_IRCD_SIMD_STR_H
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// String toolset.
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//
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// Whole vectors are in play at a time, with null termination allowing for
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// string ops at character granularity. A few basic rules:
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//
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// - Strings are laid onto vectors with character elements; the templates
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// accept c8/i8/u8 in combination with vector sizes of 16, 32 and 64. This
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// is not always addressable memory, so this is a value-oriented interface
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// and uses no character pointers; only pointers to vectors (whole strings).
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//
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// - Strings are null terminated iff there is room for a null character. If
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// a vector does not contain a null character the string's length is the
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// vector size itself. It is up to the caller (or a derived interface) to
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// compose long strings out of unterminated blocks.
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//
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// - Null termination *must* be padded out to the end of the vector. This is
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// important for performance. Unless otherwise noted there is one string on
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// a vector at a time and the first character is lane[0]
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//
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namespace ircd::simd
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{
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template<class T>
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typename std::enable_if<simd::sizeof_lane<T>() == 1, u8>::type
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strlen(const T) noexcept;
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template<class T>
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typename std::enable_if<simd::sizeof_lane<T>() == 1, bool>::type
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streq(const T, const T) noexcept;
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template<class T>
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typename std::enable_if<simd::sizeof_lane<T>() == 1, T &>::type
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strcpy(T &, const T) noexcept;
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template<class T>
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typename std::enable_if<simd::sizeof_lane<T>() == 1, T &>::type
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strcpy(T &, const const_buffer &) noexcept;
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template<class T>
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typename std::enable_if<simd::sizeof_lane<T>() == 1, T &>::type
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strcat(T &, const T) noexcept;
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}
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template<class T>
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inline typename std::enable_if<ircd::simd::sizeof_lane<T>() == 1, T &>::type
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ircd::simd::strcat(T &a,
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const T b)
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noexcept
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{
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static_assert
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(
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sizeof_lane<T>() == 1,
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"internal template; for 8-bit character basis only"
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);
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size_t j{0}, i
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{
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strlen(a)
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};
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while(b[j] && i < lanes<T>())
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a[i++] = b[j++];
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while(i < lanes<T>())
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a[i++] = 0;
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return a;
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}
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template<class T>
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inline typename std::enable_if<ircd::simd::sizeof_lane<T>() == 1, T &>::type
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ircd::simd::strcpy(T &a,
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const const_buffer &b)
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noexcept
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{
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static_assert
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(
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sizeof_lane<T>() == 1,
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"internal template; for 8-bit character basis only"
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);
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size_t i{0};
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for(; i < lanes<T>() && i < size(b); ++i)
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a[i] = b[i];
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while(i < lanes<T>())
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a[i++] = 0;
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return a;
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}
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template<class T>
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inline typename std::enable_if<ircd::simd::sizeof_lane<T>() == 1, T &>::type
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ircd::simd::strcpy(T &a,
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const T b)
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noexcept
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{
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static_assert
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(
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sizeof_lane<T>() == 1,
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"internal template; for 8-bit character basis only"
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);
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size_t i{0};
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for(; b[i] && i < lanes<T>(); ++i)
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a[i] = b[i];
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while(i < lanes<T>())
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a[i++] = 0;
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return a;
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}
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template<class T>
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inline typename std::enable_if<ircd::simd::sizeof_lane<T>() == 1, bool>::type
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ircd::simd::streq(const T a,
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const T b)
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noexcept
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{
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static_assert
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(
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sizeof_lane<T>() == 1,
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"internal template; for 8-bit character basis only"
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);
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const auto equal
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{
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a == b
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};
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return all<T>(equal);
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}
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template<class T>
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inline typename std::enable_if<ircd::simd::sizeof_lane<T>() == 1, ircd::u8>::type
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ircd::simd::strlen(const T str)
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noexcept
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{
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static_assert
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(
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sizeof_lane<T>() == 1,
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"internal template; for 8-bit character basis only"
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);
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u8 ret(0);
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for(; ret < lanes<T>(); ++ret)
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if(!str[ret])
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break;
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return ret;
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}
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