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| author | Jakub Jelinek <jakub@redhat.com> | 2011-06-22 12:46:36 +0200 |
|---|---|---|
| committer | Jakub Jelinek <jakub@gcc.gnu.org> | 2011-06-22 12:46:36 +0200 |
| commit | 36dc1a88ff11de41ed1b2a313f28ad12cd3c7bd3 (patch) | |
| tree | 5db992248a216e242d2e9eff0ad5aea9a9f3ebdd /gcc/tree-ssa-ccp.c | |
| parent | 41cd495729ac43083ce23687b55c42f3a6c298d1 (diff) | |
| download | gcc-36dc1a88ff11de41ed1b2a313f28ad12cd3c7bd3.zip gcc-36dc1a88ff11de41ed1b2a313f28ad12cd3c7bd3.tar.gz gcc-36dc1a88ff11de41ed1b2a313f28ad12cd3c7bd3.tar.bz2 | |
tree-ssa-ccp.c (evaluate_stmt): Try bitwise tracking for builtin calls even if likelyvalue is not CONSTANT.
* tree-ssa-ccp.c (evaluate_stmt): Try bitwise tracking for
builtin calls even if likelyvalue is not CONSTANT.
Handle BUILT_IN_STRDUP and BUILT_IN_STRNDUP like BUILT_IN_MALLOC.
Return get_value_for_expr of first operand
for BUILT_IN_{MEM{CPY,MOVE,SET},STR{,N}CPY}{,_CHK}.
* tree-ssa-alias.c (ref_maybe_used_by_call_p_1): Handle
BUILT_IN_{MEM{{,P}CPY,MOVE,SET},STR{,N}C{PY,AT},STPCPY}_CHK like
their non-checking counterparts.
(call_may_clobber_ref_p_1): Likewise.
(stmt_kills_ref_p_1): Handle BUILT_IN_MEM{{,P}CPY,MOVE,SET}_CHK
like their non-checking counterparts.
* tree-ssa-structalias.c (find_func_aliases_for_builtin_call):
Handle BUILT_IN_{MEM{{,P}CPY,MOVE,SET},STR{,N}C{PY,AT},STPCPY}_CHK
like their non-checking counterparts.
(find_func_clobbers): Likewise.
* tree-ssa-dce.c (propagate_necessity): Handle BUILT_IN_MEMSET_CHK
like BUILT_IN_MEMSET and BUILT_IN_CALLOC like BUILT_IN_MALLOC.
From-SVN: r175290
Diffstat (limited to 'gcc/tree-ssa-ccp.c')
| -rw-r--r-- | gcc/tree-ssa-ccp.c | 18 |
1 files changed, 17 insertions, 1 deletions
diff --git a/gcc/tree-ssa-ccp.c b/gcc/tree-ssa-ccp.c index 11bfb76..fd95abb 100644 --- a/gcc/tree-ssa-ccp.c +++ b/gcc/tree-ssa-ccp.c @@ -1556,7 +1556,7 @@ evaluate_stmt (gimple stmt) /* Resort to simplification for bitwise tracking. */ if (flag_tree_bit_ccp - && likelyvalue == CONSTANT + && (likelyvalue == CONSTANT || is_gimple_call (stmt)) && !is_constant) { enum gimple_code code = gimple_code (stmt); @@ -1616,6 +1616,8 @@ evaluate_stmt (gimple stmt) case BUILT_IN_MALLOC: case BUILT_IN_REALLOC: case BUILT_IN_CALLOC: + case BUILT_IN_STRDUP: + case BUILT_IN_STRNDUP: val.lattice_val = CONSTANT; val.value = build_int_cst (TREE_TYPE (gimple_get_lhs (stmt)), 0); val.mask = shwi_to_double_int @@ -1631,6 +1633,20 @@ evaluate_stmt (gimple stmt) / BITS_PER_UNIT - 1)); break; + /* These builtins return their first argument, unmodified. */ + case BUILT_IN_MEMCPY: + case BUILT_IN_MEMMOVE: + case BUILT_IN_MEMSET: + case BUILT_IN_STRCPY: + case BUILT_IN_STRNCPY: + case BUILT_IN_MEMCPY_CHK: + case BUILT_IN_MEMMOVE_CHK: + case BUILT_IN_MEMSET_CHK: + case BUILT_IN_STRCPY_CHK: + case BUILT_IN_STRNCPY_CHK: + val = get_value_for_expr (gimple_call_arg (stmt, 0), true); + break; + default:; } } |