diff options
| author | Richard Guenther <rguenther@suse.de> | 2010-07-26 16:01:55 +0000 |
|---|---|---|
| committer | Richard Biener <rguenth@gcc.gnu.org> | 2010-07-26 16:01:55 +0000 |
| commit | 7f8ac3d7f9914527dbc0052d21326bc351f211e9 (patch) | |
| tree | 4dd9226e46cf61e9b8b0ed19dc32773d0e0121c8 /gcc/tree-nrv.c | |
| parent | 6a2ba1839d6cbcde7424e9c10a200d19d34beeb8 (diff) | |
re PR tree-optimization/43784 (-Os -fkeep-inline-functions causes FAIL: gcc.c-torture/execute/builtins/pr22237.c execution)
2010-07-26 Richard Guenther <rguenther@suse.de>
PR tree-optimization/43784
* tree-nrv.c (dest_safe_for_nrv_p): It's not safe to NRV
if the destination is used by the call.
* gcc.c-torture/execute/pr43784.c: New testcase.
* g++.dg/torture/pr43784.C: Likewise.
From-SVN: r162539
Diffstat (limited to 'gcc/tree-nrv.c')
| -rw-r--r-- | gcc/tree-nrv.c | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/gcc/tree-nrv.c b/gcc/tree-nrv.c index 2f40d563d33..8ee3b8b0a4b 100644 --- a/gcc/tree-nrv.c +++ b/gcc/tree-nrv.c @@ -296,7 +296,7 @@ struct gimple_opt_pass pass_nrv = optimization, where DEST is expected to be the LHS of a modify expression where the RHS is a function returning an aggregate. - DEST is available if it is not clobbered by the call. */ + DEST is available if it is not clobbered or used by the call. */ static bool dest_safe_for_nrv_p (gimple call) @@ -310,7 +310,8 @@ dest_safe_for_nrv_p (gimple call) if (TREE_CODE (dest) == SSA_NAME) return true; - if (call_may_clobber_ref_p (call, dest)) + if (call_may_clobber_ref_p (call, dest) + || ref_maybe_used_by_stmt_p (call, dest)) return false; return true; @@ -345,8 +346,7 @@ execute_return_slot_opt (void) && gimple_call_lhs (stmt) && !gimple_call_return_slot_opt_p (stmt) && aggregate_value_p (TREE_TYPE (gimple_call_lhs (stmt)), - gimple_call_fndecl (stmt)) - ) + gimple_call_fndecl (stmt))) { /* Check if the location being assigned to is clobbered by the call. */ |