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344 lines
8.5 KiB
C
Executable file
344 lines
8.5 KiB
C
Executable file
/*
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===========================================================================
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Copyright (C) 1999-2005 Id Software, Inc.
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This file is part of Quake III Arena source code.
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Quake III Arena source code is free software; you can redistribute it
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and/or modify it under the terms of the GNU General Public License as
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published by the Free Software Foundation; either version 2 of the License,
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or (at your option) any later version.
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Quake III Arena source code is distributed in the hope that it will be
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useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with Foobar; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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===========================================================================
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*/
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/**
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* GAS syntax equivalents of the MSVC asm memory calls in common.c
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*
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* The following changes have been made to the asm:
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* 1. Registers are loaded by the inline asm arguments when possible
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* 2. Labels have been changed to local label format (0,1,etc.) to allow inlining
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*
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* HISTORY:
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* AH - Created on 08 Dec 2000
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*/
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#include <unistd.h> // AH - for size_t
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#include <string.h>
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// bk001207 - we need something under Linux, too. Mac?
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#if 1 // defined(C_ONLY) // bk010102 - dedicated?
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void Com_Memcpy (void* dest, const void* src, const size_t count) {
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memcpy(dest, src, count);
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}
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void Com_Memset (void* dest, const int val, const size_t count) {
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memset(dest, val, count);
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}
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#else
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typedef enum {
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PRE_READ, // prefetch assuming that buffer is used for reading only
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PRE_WRITE, // prefetch assuming that buffer is used for writing only
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PRE_READ_WRITE // prefetch assuming that buffer is used for both reading and writing
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} e_prefetch;
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void Com_Prefetch (const void *s, const unsigned int bytes, e_prefetch type);
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void _copyDWord (unsigned int* dest, const unsigned int constant, const unsigned int count) {
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// MMX version not used on standard Pentium MMX
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// because the dword version is faster (with
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// proper destination prefetching)
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__asm__ __volatile__ (" \
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//mov eax,constant // eax = val \
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//mov edx,dest // dest \
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//mov ecx,count \
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movd %%eax, %%mm0 \
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punpckldq %%mm0, %%mm0 \
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\
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// ensure that destination is qword aligned \
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\
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testl $7, %%edx // qword padding?\
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jz 0f \
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movl %%eax, (%%edx) \
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decl %%ecx \
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addl $4, %%edx \
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\
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0: movl %%ecx, %%ebx \
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andl $0xfffffff0, %%ecx \
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jz 2f \
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jmp 1f \
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.align 16 \
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\
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// funny ordering here to avoid commands \
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// that cross 32-byte boundaries (the \
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// [edx+0] version has a special 3-byte opcode... \
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1: movq %%mm0, 8(%%edx) \
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movq %%mm0, 16(%%edx) \
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movq %%mm0, 24(%%edx) \
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movq %%mm0, 32(%%edx) \
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movq %%mm0, 40(%%edx) \
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movq %%mm0, 48(%%edx) \
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movq %%mm0, 56(%%edx) \
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movq %%mm0, (%%edx)\
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addl $64, %%edx \
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subl $16, %%ecx \
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jnz 1b \
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2: \
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movl %%ebx, %%ecx // ebx = cnt \
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andl $0xfffffff0, %%ecx // ecx = cnt&~15 \
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subl %%ecx, %%ebx \
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jz 6f \
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cmpl $8, %%ebx \
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jl 3f \
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\
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movq %%mm0, (%%edx) \
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movq %%mm0, 8(%%edx) \
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movq %%mm0, 16(%%edx) \
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movq %%mm0, 24(%%edx) \
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addl $32, %%edx \
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subl $8, %%ebx \
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jz 6f \
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\
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3: cmpl $4, %%ebx \
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jl 4f \
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\
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movq %%mm0, (%%edx) \
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movq %%mm0, 8(%%edx) \
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addl $16, %%edx \
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subl $4, %%ebx \
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\
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4: cmpl $2, %%ebx \
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jl 5f \
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movq %%mm0, (%%edx) \
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addl $8, %%edx \
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subl $2, %%ebx \
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\
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5: cmpl $1, %%ebx \
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jl 6f \
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movl %%eax, (%%edx) \
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6: \
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emms \
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"
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: : "a" (constant), "c" (count), "d" (dest)
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: "%ebx", "%edi", "%esi", "cc", "memory");
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}
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// optimized memory copy routine that handles all alignment
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// cases and block sizes efficiently
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void Com_Memcpy (void* dest, const void* src, const size_t count) {
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Com_Prefetch (src, count, PRE_READ);
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__asm__ __volatile__ (" \
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pushl %%edi \
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pushl %%esi \
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//mov ecx,count \
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cmpl $0, %%ecx // count = 0 check (just to be on the safe side) \
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je 6f \
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//mov edx,dest \
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movl %0, %%ebx \
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cmpl $32, %%ecx // padding only? \
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jl 1f \
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\
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movl %%ecx, %%edi \
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andl $0xfffffe00, %%edi // edi = count&~31 \
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subl $32, %%edi \
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\
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.align 16 \
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0: \
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movl (%%ebx, %%edi, 1), %%eax \
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movl 4(%%ebx, %%edi, 1), %%esi \
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movl %%eax, (%%edx, %%edi, 1) \
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movl %%esi, 4(%%edx, %%edi, 1) \
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movl 8(%%ebx, %%edi, 1), %%eax \
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movl 12(%%ebx, %%edi, 1), %%esi \
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movl %%eax, 8(%%edx, %%edi, 1) \
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movl %%esi, 12(%%edx, %%edi, 1) \
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movl 16(%%ebx, %%edi, 1), %%eax \
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movl 20(%%ebx, %%edi, 1), %%esi \
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movl %%eax, 16(%%edx, %%edi, 1) \
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movl %%esi, 20(%%edx, %%edi, 1) \
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movl 24(%%ebx, %%edi, 1), %%eax \
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movl 28(%%ebx, %%edi, 1), %%esi \
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movl %%eax, 24(%%edx, %%edi, 1) \
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movl %%esi, 28(%%edx, %%edi, 1) \
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subl $32, %%edi \
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jge 0b \
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\
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movl %%ecx, %%edi \
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andl $0xfffffe00, %%edi \
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addl %%edi, %%ebx // increase src pointer \
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addl %%edi, %%edx // increase dst pointer \
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andl $31, %%ecx // new count \
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jz 6f // if count = 0, get outta here \
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\
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1: \
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cmpl $16, %%ecx \
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jl 2f \
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movl (%%ebx), %%eax \
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movl %%eax, (%%edx) \
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movl 4(%%ebx), %%eax \
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movl %%eax, 4(%%edx) \
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movl 8(%%ebx), %%eax \
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movl %%eax, 8(%%edx) \
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movl 12(%%ebx), %%eax \
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movl %%eax, 12(%%edx) \
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subl $16, %%ecx \
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addl $16, %%ebx \
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addl $16, %%edx \
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2: \
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cmpl $8, %%ecx \
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jl 3f \
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movl (%%ebx), %%eax \
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movl %%eax, (%%edx) \
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movl 4(%%ebx), %%eax \
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subl $8, %%ecx \
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movl %%eax, 4(%%edx) \
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addl $8, %%ebx \
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addl $8, %%edx \
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3: \
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cmpl $4, %%ecx \
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jl 4f \
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movl (%%ebx), %%eax // here 4-7 bytes \
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addl $4, %%ebx \
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subl $4, %%ecx \
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movl %%eax, (%%edx) \
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addl $4, %%edx \
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4: // 0-3 remaining bytes \
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cmpl $2, %%ecx \
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jl 5f \
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movw (%%ebx), %%ax // two bytes \
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cmpl $3, %%ecx // less than 3? \
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movw %%ax, (%%edx) \
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jl 6f \
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movb 2(%%ebx), %%al // last byte \
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movb %%al, 2(%%edx) \
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jmp 6f \
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5: \
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cmpl $1, %%ecx \
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jl 6f \
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movb (%%ebx), %%al \
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movb %%al, (%%edx) \
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6: \
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popl %%esi \
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popl %%edi \
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"
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: : "m" (src), "d" (dest), "c" (count)
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: "%eax", "%ebx", "%edi", "%esi", "cc", "memory");
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}
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void Com_Memset (void* dest, const int val, const size_t count)
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{
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unsigned int fillval;
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if (count < 8)
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{
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__asm__ __volatile__ (" \
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//mov edx,dest \
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//mov eax, val \
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movb %%al, %%ah \
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movl %%eax, %%ebx \
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andl $0xffff, %%ebx \
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shll $16, %%eax \
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addl %%ebx, %%eax // eax now contains pattern \
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//mov ecx,count \
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cmpl $4, %%ecx \
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jl 0f \
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movl %%eax, (%%edx) // copy first dword \
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addl $4, %%edx \
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subl $4, %%ecx \
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0: cmpl $2, %%ecx \
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jl 1f \
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movw %%ax, (%%edx) // copy 2 bytes \
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addl $2, %%edx \
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subl $2, %%ecx \
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1: cmpl $0, %%ecx \
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je 2f \
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movb %%al, (%%edx) // copy single byte \
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2: \
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"
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: : "d" (dest), "a" (val), "c" (count)
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: "%ebx", "%edi", "%esi", "cc", "memory");
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return;
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}
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fillval = val;
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fillval = fillval|(fillval<<8);
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fillval = fillval|(fillval<<16); // fill dword with 8-bit pattern
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_copyDWord ((unsigned int*)(dest),fillval, count/4);
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__asm__ __volatile__ (" // padding of 0-3 bytes \
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//mov ecx,count \
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movl %%ecx, %%eax \
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andl $3, %%ecx \
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jz 1f \
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andl $0xffffff00, %%eax \
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//mov ebx,dest \
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addl %%eax, %%edx \
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movl %0, %%eax \
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cmpl $2, %%ecx \
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jl 0f \
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movw %%ax, (%%edx) \
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cmpl $2, %%ecx \
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je 1f \
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movb %%al, 2(%%edx) \
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jmp 1f \
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0: \
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cmpl $0, %%ecx\
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je 1f\
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movb %%al, (%%edx)\
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1: \
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"
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: : "m" (fillval), "c" (count), "d" (dest)
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: "%eax", "%ebx", "%edi", "%esi", "cc", "memory");
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}
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void Com_Prefetch (const void *s, const unsigned int bytes, e_prefetch type)
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{
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// write buffer prefetching is performed only if
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// the processor benefits from it. Read and read/write
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// prefetching is always performed.
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switch (type)
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{
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case PRE_WRITE : break;
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case PRE_READ:
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case PRE_READ_WRITE:
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__asm__ __volatile__ ("\
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//mov ebx,s\
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//mov ecx,bytes\
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cmpl $4096, %%ecx // clamp to 4kB\
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jle 0f\
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movl $4096, %%ecx\
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0:\
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addl $0x1f, %%ecx\
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shrl $5, %%ecx // number of cache lines\
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jz 2f\
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jmp 1f\
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\
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.align 16\
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1: testb %%al, (%%edx)\
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addl $32, %%edx\
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decl %%ecx\
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jnz 1b\
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2:\
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"
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: : "d" (s), "c" (bytes)
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: "%eax", "%ebx", "%edi", "%esi", "memory", "cc");
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break;
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}
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}
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#endif
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