Mercurial > hg > CbC > CbC_gcc
view gcc/config/spu/mfc_tag_reserve.c @ 67:f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
author | nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp> |
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date | Tue, 22 Mar 2011 17:18:12 +0900 |
parents | a06113de4d67 |
children |
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/* Copyright (C) 2007, 2009 Free Software Foundation, Inc. This file is part of GCC. GCC 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, or (at your option) any later version. GCC 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. Under Section 7 of GPL version 3, you are granted additional permissions described in the GCC Runtime Library Exception, version 3.1, as published by the Free Software Foundation. You should have received a copy of the GNU General Public License and a copy of the GCC Runtime Library Exception along with this program; see the files COPYING3 and COPYING.RUNTIME respectively. If not, see <http://www.gnu.org/licenses/>. */ #include <spu_mfcio.h> extern vector unsigned int __mfc_tag_table; /* Reserves a DMA tag for exclusive use. This routine returns an available tag id in the range 0 to 31 and marks the tag as reserved. If no tags are available, MFC_DMA_TAG_INVALID is returned indicating that all tags are already reserved. */ unsigned int __mfc_tag_reserve (void) { vector unsigned int mask = (vector unsigned int) { 0x80000000, 0x80000000, 0x80000000, 0x80000000 }; vector unsigned int count_zeros, is_valid; vector signed int count_neg; count_zeros = spu_cntlz (__mfc_tag_table); count_neg = spu_sub (0, (vector signed int) count_zeros); mask = spu_rlmask (mask, (vector signed int) count_neg); __mfc_tag_table = spu_andc (__mfc_tag_table, mask); is_valid = spu_cmpeq (count_zeros, 32); count_zeros = spu_sel (count_zeros, is_valid, is_valid); return spu_extract (count_zeros, 0); }