diff options
Diffstat (limited to 'gcc-4.9/libgcc/config/spu/mfc_tag_release.c')
-rw-r--r-- | gcc-4.9/libgcc/config/spu/mfc_tag_release.c | 59 |
1 files changed, 59 insertions, 0 deletions
diff --git a/gcc-4.9/libgcc/config/spu/mfc_tag_release.c b/gcc-4.9/libgcc/config/spu/mfc_tag_release.c new file mode 100644 index 000000000..b3de2da9c --- /dev/null +++ b/gcc-4.9/libgcc/config/spu/mfc_tag_release.c @@ -0,0 +1,59 @@ +/* Copyright (C) 2007-2014 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 the specified DMA tag from exclusive use. Once released, the + tag is available for future reservation. Upon successful release, + MFC_DMA_TAG_VALID is returned. If the specified tag is not in the + range 0 to 31, or had not been reserved, no action is taken and + MFC_DMA_TAG_INVALID is returned. */ + +unsigned int +__mfc_tag_release (unsigned int tag) +{ + vector unsigned int is_invalid; + vector unsigned int mask = (vector unsigned int) + { 0x80000000, 0x80000000, 0x80000000, 0x80000000 }; + vector signed int zero = (vector signed int) { 0, 0, 0, 0 }; + + vector signed int has_been_reserved; + + /* Check if the tag is out of range. */ + is_invalid = spu_cmpgt (spu_promote (tag, 0), 31); + + /* Check whether the tag has been reserved, set to all 1 if has not + been reserved, 0 otherwise. */ + has_been_reserved = (vector signed int) spu_rl (__mfc_tag_table, tag); + has_been_reserved = (vector signed int) spu_cmpgt (zero, has_been_reserved); + + /* Set invalid. */ + is_invalid = spu_or ((vector unsigned int) has_been_reserved, is_invalid); + + mask = spu_rlmask (mask, (int)(-tag)); + __mfc_tag_table = spu_or (__mfc_tag_table, mask); + + return spu_extract(is_invalid, 0); +} + |