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[/] [openrisc/] [trunk/] [gnu-src/] [gcc-4.5.1/] [gcc/] [config/] [spu/] [mfc_multi_tag_release.c] - Rev 333
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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; /* Release a sequential group of tags from exclusive use. The sequential group of tags is the range starting from <first_tag> through <first_tag>+<number_of_tags>-1. Upon sucessful release, MFC_DMA_TAG_VALID is returned and the tags become available for future reservation. If the specified tags were not previously reserved, no action is taken and MFC_DMA_TAG_INVALID is returned. */ unsigned int __mfc_multi_tag_release (unsigned int first_tag, unsigned int number_of_tags) { vector unsigned int table_copy, tmp, tmp1; vector unsigned int one = (vector unsigned int) { 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF }; vector unsigned int is_invalid; unsigned int last_tag; vector unsigned int has_been_reserved; last_tag = first_tag + number_of_tags; table_copy = spu_sl (one, number_of_tags); table_copy = spu_rl (table_copy, -last_tag); table_copy = spu_xor (table_copy, -1); /* Make sure the tags are in range and valid. */ tmp = spu_cmpgt (spu_promote(last_tag, 0), 32); tmp1 = spu_cmpgt (spu_promote(number_of_tags, 0), 32); is_invalid = spu_cmpgt (spu_promote(first_tag, 0), 31); /* All bits are set to 1 if invalid, 0 if valid. */ is_invalid = spu_or (tmp, is_invalid); is_invalid = spu_or (tmp1, is_invalid); /* check whether these tags have been reserved */ tmp = spu_rlmask (one, (int)-number_of_tags); tmp1 = spu_sl (__mfc_tag_table, first_tag); has_been_reserved = spu_cmpgt(tmp1, tmp); is_invalid = spu_or (has_been_reserved, is_invalid); table_copy = spu_sel (__mfc_tag_table, table_copy, table_copy); __mfc_tag_table = spu_sel (table_copy, __mfc_tag_table, is_invalid); return spu_extract (is_invalid, 0); }
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