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| author | David Malcolm <dmalcolm@redhat.com> | 2016-05-20 14:20:03 +0000 |
|---|---|---|
| committer | David Malcolm <dmalcolm@gcc.gnu.org> | 2016-05-20 14:20:03 +0000 |
| commit | 9a385c2d3d74ffed78f2ed9ad47b844d2f294105 (patch) | |
| tree | d8d972fbd4d22fa989496efe8ce39275409a0d3d /gcc/cfgexpand.c | |
| parent | b40d90e6c569c434002f968a197d58eed0d2aaa3 (diff) | |
| download | gcc-9a385c2d3d74ffed78f2ed9ad47b844d2f294105.zip gcc-9a385c2d3d74ffed78f2ed9ad47b844d2f294105.tar.gz gcc-9a385c2d3d74ffed78f2ed9ad47b844d2f294105.tar.bz2 | |
Implement CALL_EXPR_MUST_TAIL_CALL
This patch implements support for marking CALL_EXPRs
as being mandatory for tail-call-optimization. expand_call
tries harder to perform the optimization on such CALL_EXPRs,
and issues an error if it fails.
Currently this flag isn't accessible from any frontend,
so the patch uses a plugin for testing the functionality.
gcc/ChangeLog:
* calls.c (maybe_complain_about_tail_call): New function.
(initialize_argument_information): Call
maybe_complain_about_tail_call when clearing *may_tailcall.
(can_implement_as_sibling_call_p): Call
maybe_complain_about_tail_call when returning false.
(expand_call): Read CALL_EXPR_MUST_TAIL_CALL and, if set,
ensure try_tail_call is set. Call maybe_complain_about_tail_call
if tail-call optimization fails.
* cfgexpand.c (expand_call_stmt): Initialize
CALL_EXPR_MUST_TAIL_CALL from gimple_call_must_tail_p.
* gimple-pretty-print.c (dump_gimple_call): Dump
gimple_call_must_tail_p.
* gimple.c (gimple_build_call_from_tree): Call
gimple_call_set_must_tail with the value of
CALL_EXPR_MUST_TAIL_CALL.
* gimple.h (enum gf_mask): Add GF_CALL_MUST_TAIL_CALL.
(gimple_call_set_must_tail): New function.
(gimple_call_must_tail_p): New function.
* print-tree.c (print_node): Update printing of TREE_STATIC
to reflect its use for CALL_EXPR_MUST_TAIL_CALL.
* tree-core.h (struct tree_base): Add MUST_TAIL_CALL to the
trailing comment listing applicable flags.
* tree.h (CALL_EXPR_MUST_TAIL_CALL): New macro.
gcc/testsuite/ChangeLog:
* gcc.dg/plugin/must-tail-call-1.c: New test case.
* gcc.dg/plugin/must-tail-call-2.c: New test case.
* gcc.dg/plugin/must_tail_call_plugin.c: New file.
* gcc.dg/plugin/plugin.exp (plugin_test_list): Add the above.
From-SVN: r236514
Diffstat (limited to 'gcc/cfgexpand.c')
| -rw-r--r-- | gcc/cfgexpand.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/gcc/cfgexpand.c b/gcc/cfgexpand.c index 1461ad8..56ef71d 100644 --- a/gcc/cfgexpand.c +++ b/gcc/cfgexpand.c @@ -2626,6 +2626,7 @@ expand_call_stmt (gcall *stmt) TREE_NOTHROW (exp) = 1; CALL_EXPR_TAILCALL (exp) = gimple_call_tail_p (stmt); + CALL_EXPR_MUST_TAIL_CALL (exp) = gimple_call_must_tail_p (stmt); CALL_EXPR_RETURN_SLOT_OPT (exp) = gimple_call_return_slot_opt_p (stmt); if (decl && DECL_BUILT_IN_CLASS (decl) == BUILT_IN_NORMAL |