Merge remote-tracking branch 'Kernel/master'

2025-07-02 02:49:15 +00:00 · 2024-11-20 05:00:33 +02:00
parent 93d408e0af 19f2a78d35
commit 682c84b2af
468 changed files with 112800 additions and 1 deletions
--- a/Kernel/library/simd_strlen.cpp
+++ b/Kernel/library/simd_strlen.cpp
@ -0,0 +1,122 @@
+/*
+	This file is part of Fennix Kernel.
+
+	Fennix Kernel is free software: you can redistribute it and/or
+	modify it under the terms of the GNU General Public License as
+	published by the Free Software Foundation, either version 3 of
+	the License, or (at your option) any later version.
+
+	Fennix Kernel 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 General Public License for more details.
+
+	You should have received a copy of the GNU General Public License
+	along with Fennix Kernel. If not, see <https://www.gnu.org/licenses/>.
+*/
+
+#include <convert.h>
+
+#include <memory.hpp>
+#include <limits.h>
+#include <debug.h>
+#include <cpu.hpp>
+
+/*
+TODO: Replace these functions with even more optimized versions.
+	  The current versions are fast but not as fast as they could be and also we need implementation for avx, not only sse.
+*/
+
+long unsigned __strlen(const char s[])
+{
+	size_t ret = (size_t)s;
+
+	asmv("._strlenLoop:"
+		 "cmpb $0, 0(%1)\n"
+		 "jz ._strlenExit\n"
+		 "cmpb $0, 1(%1)\n"
+		 "jz .scmp1\n"
+		 "cmpb $0, 2(%1)\n"
+		 "jz .scmp2\n"
+		 "cmpb $0, 3(%1)\n"
+		 "jz .scmp3\n"
+		 "cmpb $0, 4(%1)\n"
+		 "jz .scmp4\n"
+		 "cmpb $0, 5(%1)\n"
+		 "jz .scmp5\n"
+		 "cmpb $0, 6(%1)\n"
+		 "jz .scmp6\n"
+		 "cmpb $0, 7(%1)\n"
+		 "jz .scmp7\n"
+
+		 "add $8, %1\n"
+		 "jmp ._strlenLoop\n"
+
+		 ".scmp1:"
+		 "inc %1\n"
+		 "jmp ._strlenExit\n"
+		 ".scmp2:"
+		 "add $2, %1\n"
+		 "jmp ._strlenExit\n"
+		 ".scmp3:"
+		 "add $3, %1\n"
+		 "jmp ._strlenExit\n"
+		 ".scmp4:"
+		 "add $4, %1\n"
+		 "jmp ._strlenExit\n"
+		 ".scmp5:"
+		 "add $5, %1\n"
+		 "jmp ._strlenExit\n"
+		 ".scmp6:"
+		 "add $6, %1\n"
+		 "jmp ._strlenExit\n"
+		 ".scmp7:"
+		 "add $7, %1\n"
+
+		 "._strlenExit:"
+		 "mov %1, %0\n"
+		 : "=r"(ret) : "0"(ret));
+
+	return ret - (size_t)s;
+}
+
+long unsigned strlen_sse(const char s[])
+{
+	return __strlen(s);
+}
+
+long unsigned strlen_sse2(const char s[])
+{
+	return __strlen(s);
+}
+
+long unsigned strlen_sse3(const char s[])
+{
+	return __strlen(s);
+}
+
+long unsigned strlen_ssse3(const char s[])
+{
+	return __strlen(s);
+}
+
+long unsigned strlen_sse4_1(const char s[])
+{
+	return __strlen(s);
+}
+
+long unsigned strlen_sse4_2(const char s[])
+{
+	size_t ret;
+	asmv("mov $-16, %0\n"
+		 "pxor %%xmm0, %%xmm0\n"
+		 ".strlen42Loop:"
+		 "add $16, %0\n"
+		 "pcmpistri $0x08, (%0,%1), %%xmm0\n"
+		 "jnz .strlen42Loop\n"
+		 "add %2, %0\n"
+		 : "=a"(ret)
+		 : "d"((size_t)s), "c"((size_t)s));
+
+	return ret;
+}