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| author | Eric Botcazou <ebotcazou@adacore.com> | 2012-06-15 09:22:00 +0000 |
|---|---|---|
| committer | Eric Botcazou <ebotcazou@gcc.gnu.org> | 2012-06-15 09:22:00 +0000 |
| commit | 2da02156af964dbd197f19cbd7fea003a73aacb3 (patch) | |
| tree | 25c62c51c178ea6a10880eb537b869fdb857970d /gcc/tree-ssa-dce.c | |
| parent | 6724292e72a9bdbafb0d95587740378f36036707 (diff) | |
| download | gcc-2da02156af964dbd197f19cbd7fea003a73aacb3.tar.gz | |
re PR middle-end/53590 (compiler fails to generate SIMD instruction for FP division)
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.
From-SVN: r188651
Diffstat (limited to 'gcc/tree-ssa-dce.c')
| -rw-r--r-- | gcc/tree-ssa-dce.c | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/gcc/tree-ssa-dce.c b/gcc/tree-ssa-dce.c index 1d72e06fe76..8763cfb28d2 100644 --- a/gcc/tree-ssa-dce.c +++ b/gcc/tree-ssa-dce.c @@ -272,8 +272,10 @@ static void mark_stmt_if_obviously_necessary (gimple stmt, bool aggressive) { /* With non-call exceptions, we have to assume that all statements could - throw. If a statement may throw, it is inherently necessary. */ - if (cfun->can_throw_non_call_exceptions && stmt_could_throw_p (stmt)) + throw. If a statement could throw, it can be deemed necessary. */ + if (cfun->can_throw_non_call_exceptions + && !cfun->can_delete_dead_exceptions + && stmt_could_throw_p (stmt)) { mark_stmt_necessary (stmt, true); return; |