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| author | Marc Glisse <marc.glisse@inria.fr> | 2013-10-29 14:19:08 +0100 |
|---|---|---|
| committer | Marc Glisse <glisse@gcc.gnu.org> | 2013-10-29 13:19:08 +0000 |
| commit | 4879f42a0717332876bff5f8b49d26bccdb8433d (patch) | |
| tree | 5bcb5b0ffa3c67a0e28995a6eb2346aea53ffdd5 /gcc/tree-ssa-alias.c | |
| parent | eda14d6a857eab422c6027990fa82d68c1952b55 (diff) | |
| download | gcc-4879f42a0717332876bff5f8b49d26bccdb8433d.zip gcc-4879f42a0717332876bff5f8b49d26bccdb8433d.tar.gz gcc-4879f42a0717332876bff5f8b49d26bccdb8433d.tar.bz2 | |
re PR tree-optimization/19831 (Missing DSE/malloc/free optimization)
2013-10-29 Marc Glisse <marc.glisse@inria.fr>
PR tree-optimization/19831
gcc/
* tree-ssa-alias.c (stmt_kills_ref_p_1): Handle BUILT_IN_FREE.
gcc/testsuite/
* gcc.dg/tree-ssa/alias-25.c: New file.
From-SVN: r204160
Diffstat (limited to 'gcc/tree-ssa-alias.c')
| -rw-r--r-- | gcc/tree-ssa-alias.c | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/gcc/tree-ssa-alias.c b/gcc/tree-ssa-alias.c index a3046ad..4db83bd 100644 --- a/gcc/tree-ssa-alias.c +++ b/gcc/tree-ssa-alias.c @@ -2057,6 +2057,16 @@ stmt_kills_ref_p_1 (gimple stmt, ao_ref *ref) && DECL_BUILT_IN_CLASS (callee) == BUILT_IN_NORMAL) switch (DECL_FUNCTION_CODE (callee)) { + case BUILT_IN_FREE: + { + tree ptr = gimple_call_arg (stmt, 0); + tree base = ao_ref_base (ref); + if (base && TREE_CODE (base) == MEM_REF + && TREE_OPERAND (base, 0) == ptr) + return true; + break; + } + case BUILT_IN_MEMCPY: case BUILT_IN_MEMPCPY: case BUILT_IN_MEMMOVE: |