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| author | Marc Glisse <marc.glisse@inria.fr> | 2013-11-11 21:56:19 +0100 |
|---|---|---|
| committer | Marc Glisse <glisse@gcc.gnu.org> | 2013-11-11 20:56:19 +0000 |
| commit | 35aacd4cc9fa3b7c80192eb0e78ea7bba7e56358 (patch) | |
| tree | 725f8580c1989d7c136bae9bd4336c7c2c24ab47 /gcc/tree-ssa-alias.c | |
| parent | 5783ad0ea7403304e4ea9c06818373a3bc7e62b1 (diff) | |
| download | gcc-35aacd4cc9fa3b7c80192eb0e78ea7bba7e56358.zip gcc-35aacd4cc9fa3b7c80192eb0e78ea7bba7e56358.tar.gz gcc-35aacd4cc9fa3b7c80192eb0e78ea7bba7e56358.tar.bz2 | |
tree-ssa-alias.c (stmt_kills_ref_p_1): Use ao_ref_init_from_ptr_and_size for builtins.
2013-11-11 Marc Glisse <marc.glisse@inria.fr>
Jeff Law <law@redhat.com>
gcc/
* tree-ssa-alias.c (stmt_kills_ref_p_1): Use
ao_ref_init_from_ptr_and_size for builtins.
gcc/testsuite/
* gcc.dg/tree-ssa/alias-27.c: New testcase.
Co-Authored-By: Jeff Law <law@redhat.com>
From-SVN: r204686
Diffstat (limited to 'gcc/tree-ssa-alias.c')
| -rw-r--r-- | gcc/tree-ssa-alias.c | 45 |
1 files changed, 28 insertions, 17 deletions
diff --git a/gcc/tree-ssa-alias.c b/gcc/tree-ssa-alias.c index 2785995..161a66a 100644 --- a/gcc/tree-ssa-alias.c +++ b/gcc/tree-ssa-alias.c @@ -2008,9 +2008,10 @@ static bool stmt_kills_ref_p_1 (gimple stmt, ao_ref *ref) { /* For a must-alias check we need to be able to constrain - the access properly. */ - ao_ref_base (ref); - if (ref->max_size == -1) + the access properly. + FIXME: except for BUILTIN_FREE. */ + if (!ao_ref_base (ref) + || ref->max_size == -1) return false; if (gimple_has_lhs (stmt) @@ -2097,23 +2098,33 @@ stmt_kills_ref_p_1 (gimple stmt, ao_ref *ref) { tree dest = gimple_call_arg (stmt, 0); tree len = gimple_call_arg (stmt, 2); - tree base = NULL_TREE; - HOST_WIDE_INT offset = 0; if (!host_integerp (len, 0)) return false; - if (TREE_CODE (dest) == ADDR_EXPR) - base = get_addr_base_and_unit_offset (TREE_OPERAND (dest, 0), - &offset); - else if (TREE_CODE (dest) == SSA_NAME) - base = dest; - if (base - && base == ao_ref_base (ref)) + tree rbase = ref->base; + double_int roffset = double_int::from_shwi (ref->offset); + ao_ref dref; + ao_ref_init_from_ptr_and_size (&dref, dest, len); + tree base = ao_ref_base (&dref); + double_int offset = double_int::from_shwi (dref.offset); + double_int bpu = double_int::from_uhwi (BITS_PER_UNIT); + if (!base || dref.size == -1) + return false; + if (TREE_CODE (base) == MEM_REF) + { + if (TREE_CODE (rbase) != MEM_REF) + return false; + // Compare pointers. + offset += bpu * mem_ref_offset (base); + roffset += bpu * mem_ref_offset (rbase); + base = TREE_OPERAND (base, 0); + rbase = TREE_OPERAND (rbase, 0); + } + if (base == rbase) { - HOST_WIDE_INT size = TREE_INT_CST_LOW (len); - if (offset <= ref->offset / BITS_PER_UNIT - && (offset + size - >= ((ref->offset + ref->max_size + BITS_PER_UNIT - 1) - / BITS_PER_UNIT))) + double_int size = bpu * tree_to_double_int (len); + double_int rsize = double_int::from_uhwi (ref->max_size); + if (offset.sle (roffset) + && (roffset + rsize).sle (offset + size)) return true; } break; |