diff options
Diffstat (limited to 'nx-X11/programs/Xserver/hw/xfree86/os-support/misc/SlowBcopy.S')
| -rw-r--r-- | nx-X11/programs/Xserver/hw/xfree86/os-support/misc/SlowBcopy.S | 108 |
1 files changed, 108 insertions, 0 deletions
diff --git a/nx-X11/programs/Xserver/hw/xfree86/os-support/misc/SlowBcopy.S b/nx-X11/programs/Xserver/hw/xfree86/os-support/misc/SlowBcopy.S new file mode 100644 index 000000000..9fd73a0f9 --- /dev/null +++ b/nx-X11/programs/Xserver/hw/xfree86/os-support/misc/SlowBcopy.S @@ -0,0 +1,108 @@ +/* $XFree86: xc/programs/Xserver/hw/xfree86/os-support/misc/SlowBcopy.s,v 1.2 1998/07/25 16:56:50 dawes Exp $ */ +/******************************************************************************* + Copyright 1994 by Glenn G. Lai + + All Rights Reserved + +Permission to use, copy, modify, and distribute this software and its +documentation for any purpose and without fee is hereby granted, +provided that the above copyr notice appear in all copies and that +both that copyr notice and this permission notice appear in +supporting documentation, and that the name of Glenn G. Lai not be +used in advertising or publicity pertaining to distribution of the +software without specific, written prior permission. + +Glenn G. Lai DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING +ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL +DIGITAL BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR +ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, +WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, +ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS +SOFTWARE. + +Glenn G. Lai +P.O. Box 4314 +Austin, Tx 78765 +glenn@cs.utexas.edu) +7/21/94 +*******************************************************************************/ +/* $XConsortium: SlowBcopy.s /main/4 1996/02/21 17:40:52 kaleb $ */ + +/* + * Modified from the output generated by GCC + * + * Create a dependency that should be immune from the effect of register + * renaming as is commonly seen in superscalar processors. This should + * insert a minimum of 100-ns delays between reads/writes at clock rates + * up to 100 MHz---GGL + * + * Slowbcopy(char *src, char *dst, int count) + * + */ + +#include "assyntax.h" + + FILE("SlowBcopy.s") + + AS_BEGIN + +gcc2_compiled.: +___gnu_compiled_c: + + GLOBL GLNAME(xf86SlowBcopy) + + SEG_TEXT + ALIGNTEXT4 +GLNAME(xf86SlowBcopy): + PUSH_L (EBP) + MOV_L (ESP,EBP) + PUSH_L (ESI) + PUSH_L (EBX) + MOV_L (REGOFF(8,EBP),ECX) + MOV_L (REGOFF(12,EBP),EDX) + MOV_L (REGOFF(16,EBP),ESI) + XOR_L (EAX,EAX) + CMP_L (ESI,EAX) + JGE (L3) + + ALIGNTEXT4 +L5: + MOV_B (REGIND(ECX),BL) + + MOV_B (BL, BH) + MOV_B (BH, BL) + MOV_B (BL, BH) + MOV_B (BH, BL) + MOV_B (BL, BH) + MOV_B (BH, BL) + MOV_B (BL, BH) + MOV_B (BH, BL) + MOV_B (BL, BH) + MOV_B (BH, BL) + + MOV_B (BL,REGIND(EDX)) + + INC_L (ECX) + DEC_L (ECX) + INC_L (ECX) + DEC_L (ECX) + INC_L (ECX) + DEC_L (ECX) + INC_L (ECX) + DEC_L (ECX) + INC_L (ECX) + DEC_L (ECX) + + INC_L (ECX) + INC_L (EDX) + INC_L (EAX) + CMP_L (ESI,EAX) + JL (L5) +L3: + LEA_L (REGOFF(-8,EBP),ESP) + POP_L (EBX) + POP_L (ESI) + MOV_L (EBP,ESP) + POP_L (EBP) + RET + |