| /******************************************************************************* |
| * |
| * Copyright (c) 1993 Intel Corporation |
| * |
| * Intel hereby grants you permission to copy, modify, and distribute this |
| * software and its documentation. Intel grants this permission provided |
| * that the above copyright notice appears in all copies and that both the |
| * copyright notice and this permission notice appear in supporting |
| * documentation. In addition, Intel grants this permission provided that |
| * you prominently mark as "not part of the original" any modifications |
| * made to this software or documentation, and that the name of Intel |
| * Corporation not be used in advertising or publicity pertaining to |
| * distribution of the software or the documentation without specific, |
| * written prior permission. |
| * |
| * Intel Corporation provides this AS IS, WITHOUT ANY WARRANTY, EXPRESS OR |
| * IMPLIED, INCLUDING, WITHOUT LIMITATION, ANY WARRANTY OF MERCHANTABILITY |
| * OR FITNESS FOR A PARTICULAR PURPOSE. Intel makes no guarantee or |
| * representations regarding the use of, or the results of the use of, |
| * the software and documentation in terms of correctness, accuracy, |
| * reliability, currentness, or otherwise; and you rely on the software, |
| * documentation and results solely at your own risk. |
| * |
| * IN NO EVENT SHALL INTEL BE LIABLE FOR ANY LOSS OF USE, LOSS OF BUSINESS, |
| * LOSS OF PROFITS, INDIRECT, INCIDENTAL, SPECIAL OR CONSEQUENTIAL DAMAGES |
| * OF ANY KIND. IN NO EVENT SHALL INTEL'S TOTAL LIABILITY EXCEED THE SUM |
| * PAID TO INTEL FOR THE PRODUCT LICENSED HEREUNDER. |
| * |
| ******************************************************************************/ |
| |
| .file "memset.s" |
| #ifdef __PIC |
| .pic |
| #endif |
| #ifdef __PID |
| .pid |
| #endif |
| /* |
| * (c) copyright 1989,1993 Intel Corp., all rights reserved |
| */ |
| |
| /* |
| procedure memset (optimized assembler version: 80960K series, 80960CA) |
| |
| dest_addr = memset (dest_addr, char, len) |
| |
| Fill len bytes pointed to by dest_addr with the value of char. |
| Return the original address of dest_addr. |
| |
| This program avoids performing unaligned accesses. It stores |
| from zero to seven bytes, and then stores aligned longwords, |
| and then stores from zero to seven bytes, as necessary to |
| store len bytes starting at dest_addr. |
| |
| At the time of this writing, only g0 thru g7 and g13 are available |
| for use in this leafproc; other registers would have to be saved and |
| restored. These nine registers, plus tricky use of g14 are sufficient |
| to implement the routine. |
| */ |
| |
| .globl _memset |
| .globl __memset |
| .leafproc _memset, __memset |
| .align 2 |
| _memset: |
| #ifndef __PIC |
| lda Lrett,g14 |
| #else |
| lda Lrett-(.+8)(ip),g14 |
| #endif |
| __memset: |
| cmpo 7,g2 # are there fewer than seven characters to move? |
| lda (g14),g13 # save return address |
| notand g0,7,g3 # test for non-aligned dest_ptr |
| lda 0,g14 # conform to register conventions |
| shlo 24,g1,g4 # prepare word of char |
| lda (g0),g6 # preserve dest_ptr for return |
| shro 8,g4,g5 |
| bge.f Lcloop_setup |
| cmpo g3,g0 # is dest longword aligned |
| lda 7(g3),g3 # bump dest_ptr to next longword boundary |
| or g4,g5,g4 |
| be.t Lwloop_setup |
| |
| Lbgn_cloop: |
| cmpo g6,g3 # Have we reached longword boundary? |
| stob g1,(g6) # store one byte of char |
| subo 1,g2,g2 # decrement len |
| lda 1(g6),g6 # increment dest_ptr |
| bne.t Lbgn_cloop # loop if more bytes to store before longword |
| |
| cmpobge.f 7,g2,Lcloop |
| |
| Lwloop_setup: |
| shro 16,g4,g5 |
| or g4,g5,g4 |
| mov g4,g5 # now have a longword of char |
| |
| Lwloop: |
| cmpo 15,g2 # Do we have to store more longwords? |
| stl g4,(g6) # Store longword of char |
| subo 8,g2,g2 # Decrement len |
| lda 8(g6),g6 # Increment dest_ptr |
| bl.t Lwloop # loop if more longwords to store |
| |
| Lcloop_setup: |
| cmpobge.t 0,g2,Lexit |
| |
| Lcloop: |
| cmpo 1,g2 # Is len exhausted? |
| stob g1,(g6) # Store byte |
| subo 1,g2,g2 # Decrement len |
| lda 1(g6),g6 # Increment dest_ptr |
| bne.t Lcloop # loop if more bytes to store |
| |
| Lexit: |
| bx (g13) |
| Lrett: |
| ret |
| |
| /* end of memset */ |