diff options
| author | bstarynk <bstarynk@138bc75d-0d04-0410-961f-82ee72b054a4> | 2010-03-15 06:48:43 +0000 |
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| committer | bstarynk <bstarynk@138bc75d-0d04-0410-961f-82ee72b054a4> | 2010-03-15 06:48:43 +0000 |
| commit | 14267e36f6aef0330adbfd1284d3dba3802f5088 (patch) | |
| tree | 15a484128350682413b56480efa305ed7f014bf7 /gcc/tree-ssa-math-opts.c | |
| parent | 4734edf4bda88edf99bba3319ce2c88ce6daecb0 (diff) | |
| download | gcc-14267e36f6aef0330adbfd1284d3dba3802f5088.tar.gz | |
2010-03-15 Basile Starynkevitch <basile@starynkevitch.net>
MELT branch merged with trunk rev 157452
git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/branches/melt-branch@157453 138bc75d-0d04-0410-961f-82ee72b054a4
Diffstat (limited to 'gcc/tree-ssa-math-opts.c')
| -rw-r--r-- | gcc/tree-ssa-math-opts.c | 21 |
1 files changed, 12 insertions, 9 deletions
diff --git a/gcc/tree-ssa-math-opts.c b/gcc/tree-ssa-math-opts.c index c46a57fa048..d38df8d3d00 100644 --- a/gcc/tree-ssa-math-opts.c +++ b/gcc/tree-ssa-math-opts.c @@ -940,15 +940,18 @@ find_bswap_1 (gimple stmt, struct symbolic_number *n, int limit) { /* Set up the symbolic number N by setting each byte to a value between 1 and the byte size of rhs1. The highest - order byte is set to 1 and the lowest order byte to - n.size. */ + order byte is set to n->size and the lowest order + byte to 1. */ n->size = TYPE_PRECISION (TREE_TYPE (rhs1)); if (n->size % BITS_PER_UNIT != 0) return NULL_TREE; n->size /= BITS_PER_UNIT; n->n = (sizeof (HOST_WIDEST_INT) < 8 ? 0 : - (unsigned HOST_WIDEST_INT)0x01020304 << 32 | 0x05060708); - n->n >>= (sizeof (HOST_WIDEST_INT) - n->size) * BITS_PER_UNIT; + (unsigned HOST_WIDEST_INT)0x08070605 << 32 | 0x04030201); + + if (n->size < (int)sizeof (HOST_WIDEST_INT)) + n->n &= ((unsigned HOST_WIDEST_INT)1 << + (n->size * BITS_PER_UNIT)) - 1; source_expr1 = rhs1; } @@ -988,9 +991,9 @@ find_bswap_1 (gimple stmt, struct symbolic_number *n, int limit) { /* If STMT casts to a smaller type mask out the bits not belonging to the target type. */ - n->size = type_size / BITS_PER_UNIT; n->n &= ((unsigned HOST_WIDEST_INT)1 << type_size) - 1; } + n->size = type_size / BITS_PER_UNIT; } break; default: @@ -1051,11 +1054,11 @@ static tree find_bswap (gimple stmt) { /* The number which the find_bswap result should match in order to - have a full byte swap. The insignificant bytes are masked out - before using it. */ + have a full byte swap. The number is shifted to the left according + to the size of the symbolic number before using it. */ unsigned HOST_WIDEST_INT cmp = sizeof (HOST_WIDEST_INT) < 8 ? 0 : - (unsigned HOST_WIDEST_INT)0x08070605 << 32 | 0x04030201; + (unsigned HOST_WIDEST_INT)0x01020304 << 32 | 0x05060708; struct symbolic_number n; tree source_expr; @@ -1079,7 +1082,7 @@ find_bswap (gimple stmt) ((unsigned HOST_WIDEST_INT)1 << (n.size * BITS_PER_UNIT)) - 1; n.n &= mask; - cmp &= mask; + cmp >>= (sizeof (HOST_WIDEST_INT) - n.size) * BITS_PER_UNIT; } /* A complete byte swap should make the symbolic number to start |