Imported gcc-4.4.3

[msp430-gcc.git] / gcc / config / spu / mfc_multi_tag_release.c

diff --git a/gcc/config/spu/mfc_multi_tag_release.c b/gcc/config/spu/mfc_multi_tag_release.c
new file mode 100644 (file)
index 0000000..62eb2be
--- /dev/null
+++ b/gcc/config/spu/mfc_multi_tag_release.c
@@ -0,0 +1,72 @@
+/* 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);
+}
+