diff options
| author | Eric Botcazou <ebotcazou@adacore.com> | 2012-06-15 09:22:00 +0000 |
|---|---|---|
| committer | Eric Botcazou <ebotcazou@adacore.com> | 2012-06-15 09:22:00 +0000 |
| commit | 89d7058c5ea71bfe46f1478cf9a114be3cae14bd (patch) | |
| tree | 25c62c51c178ea6a10880eb537b869fdb857970d /gcc/function.h | |
| parent | 6876fbe30fd34846829f74405225c6b5d34bc3b7 (diff) | |
PR middle-end/53590
* common.opt (-fdelete-dead-exceptions): New switch.
* doc/invoke.texi (Code Gen Options): Document it.
* cse.c (count_reg_usage) <CALL_INSN>: Use !insn_nothrow_p in lieu of
insn_could_throw_p predicate. Do not skip an insn that could throw
if dead exceptions can be deleted.
(insn_live_p): Likewise, do not return true in that case.
* dce.c (can_alter_cfg): New flag.
(deletable_insn_p): Do not return false for an insn that can throw if
the CFG can be altered and dead exceptions can be deleted.
(init_dce): Set can_alter_cfg to false for fast DCE, true otherwise.
* dse.c (scan_insn): Use !insn_nothrow_p in lieu of insn_could_throw_
predicate. Do not preserve an insn that could throw if dead exceptions
can be deleted.
* function.h (struct function): Add can_delete_dead_exceptions flag.
* function.c (allocate_struct_function): Set it.
* lto-streamer-in.c (input_struct_function_base): Stream it.
* lto-streamer-out.c (input_struct_function_base): Likewise.
* tree-ssa-dce.c (mark_stmt_if_obviously_necessary): Do not mark a
statement that could throw as necessary if dead exceptions can be
deleted.
ada/
* gcc-interface/misc.c (gnat_init_options_struct): Set
opts->x_flag_delete_dead_exceptions to 1.
git-svn-id: https://gcc.gnu.org/svn/gcc/trunk@188651 138bc75d-0d04-0410-961f-82ee72b054a4
Diffstat (limited to 'gcc/function.h')
| -rw-r--r-- | gcc/function.h | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/gcc/function.h b/gcc/function.h index c8357bf5ee0..f2fb099ea01 100644 --- a/gcc/function.h +++ b/gcc/function.h @@ -615,6 +615,10 @@ struct GTY(()) function { exceptions. */ unsigned int can_throw_non_call_exceptions : 1; + /* Nonzero if instructions that may throw exceptions but don't otherwise + contribute to the execution of the program can be deleted. */ + unsigned int can_delete_dead_exceptions : 1; + /* Fields below this point are not set for abstract functions; see allocate_struct_function. */ |