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author | Eric Botcazou <ebotcazou@adacore.com> | 2012-06-15 09:22:00 +0000 |
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committer | Eric Botcazou <ebotcazou@gcc.gnu.org> | 2012-06-15 09:22:00 +0000 |
commit | 2da02156af964dbd197f19cbd7fea003a73aacb3 (patch) | |
tree | 25c62c51c178ea6a10880eb537b869fdb857970d /gcc/cse.c | |
parent | 6724292e72a9bdbafb0d95587740378f36036707 (diff) | |
download | gcc-2da02156af964dbd197f19cbd7fea003a73aacb3.zip gcc-2da02156af964dbd197f19cbd7fea003a73aacb3.tar.gz gcc-2da02156af964dbd197f19cbd7fea003a73aacb3.tar.bz2 |
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/cse.c')
-rw-r--r-- | gcc/cse.c | 8 |
1 files changed, 4 insertions, 4 deletions
@@ -599,7 +599,6 @@ static void invalidate_from_clobbers (rtx); static void invalidate_from_sets_and_clobbers (rtx); static rtx cse_process_notes (rtx, rtx, bool *); static void cse_extended_basic_block (struct cse_basic_block_data *); -static void count_reg_usage (rtx, int *, rtx, int); static int check_for_label_ref (rtx *, void *); extern void dump_class (struct table_elt*); static void get_cse_reg_info_1 (unsigned int regno); @@ -6692,10 +6691,11 @@ count_reg_usage (rtx x, int *counts, rtx dest, int incr) case CALL_INSN: case INSN: case JUMP_INSN: - /* We expect dest to be NULL_RTX here. If the insn may trap, + /* We expect dest to be NULL_RTX here. If the insn may throw, or if it cannot be deleted due to side-effects, mark this fact by setting DEST to pc_rtx. */ - if (insn_could_throw_p (x) || side_effects_p (PATTERN (x))) + if ((!cfun->can_delete_dead_exceptions && !insn_nothrow_p (x)) + || side_effects_p (PATTERN (x))) dest = pc_rtx; if (code == CALL_INSN) count_reg_usage (CALL_INSN_FUNCTION_USAGE (x), counts, dest, incr); @@ -6800,7 +6800,7 @@ static bool insn_live_p (rtx insn, int *counts) { int i; - if (insn_could_throw_p (insn)) + if (!cfun->can_delete_dead_exceptions && !insn_nothrow_p (insn)) return true; else if (GET_CODE (PATTERN (insn)) == SET) return set_live_p (PATTERN (insn), insn, counts); |