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cse.c (this_insn_cc0, [...]): New global variables, moved out from cse_insn. 

* cse.c (this_insn_cc0, this_insn_cc0_mode): New global
	variables, moved out from cse_insn.
	(prev_insn): Remove this global variable).
	(new_basic_block): Don't set it.
	(cse_insn): Idem. Also, move code to delete unused CC0-setter
	insns and code to set prev_insn_cc0 and prev_insn_cc0_mode
	from here...
	(cse_extended_basic_block): ...to here.  Do not clear
	prev_insn_cc0 until after recording equivalences from jumps.

From-SVN: r119984
This commit is contained in:
Steven Bosscher 2006-12-17 13:11:06 +00:00
parent c8cf50e4c1
commit 96fb470d74
2 changed files with 57 additions and 37 deletions
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19
gcc/ChangeLog
View File

@ -1,3 +1,15 @@
2006-12-17 Steven Bosscher <steven@gcc.gnu.org>
* cse.c (this_insn_cc0, this_insn_cc0_mode): New global
variables, moved out from cse_insn.
(prev_insn): Remove this global variable).
(new_basic_block): Don't set it.
(cse_insn): Idem. Also, move code to delete unused CC0-setter
insns and code to set prev_insn_cc0 and prev_insn_cc0_mode
from here...
(cse_extended_basic_block): ...to here. Do not clear
prev_insn_cc0 until after recording equivalences from jumps.
2006-12-16 Jan Hubicka <jh@suse.cz>
* cgraphunit.c (ipa_passes): Clear current_function_decl.
@ -376,9 +388,10 @@
are the left hand side, set the element's is_vector_lhs to true.
(instantiate_element): For vector types which were on the left
hand size, set DECL_GIMPLE_REG_P to false.
* tree-nested.c (create_tmp_var_for): Use the renamed DECL_GIMPLE_REG_P. * tree-inline.c (declare_return_variable): Use the renamed
DECL_GIMPLE_REG_P
and check for VECTOR_TYPE.
* tree-nested.c (create_tmp_var_for): Use the renamed
DECL_GIMPLE_REG_P.
* tree-inline.c (declare_return_variable): Use the renamed
DECL_GIMPLE_REG_P and check for VECTOR_TYPE.
(copy_decl_to_var): Use the renamed DECL_GIMPLE_REG_P.
(copy_result_decl_to_var): Likewise.
* tree-vect-transform.c (vect_get_new_vect_var): For vector types,

75
gcc/cse.c
View File

@ -269,17 +269,13 @@ struct change_cc_mode_args
table since its use is guaranteed to be the insn immediately following
its definition and any other insn is presumed to invalidate it.
Instead, we store below the value last assigned to CC0. If it should
happen to be a constant, it is stored in preference to the actual
assigned value. In case it is a constant, we store the mode in which
the constant should be interpreted. */
Instead, we store below the current and last value assigned to CC0.
If it should happen to be a constant, it is stored in preference
to the actual assigned value. In case it is a constant, we store
the mode in which the constant should be interpreted. */
static rtx prev_insn_cc0;
static enum machine_mode prev_insn_cc0_mode;
/* Previous actual insn. 0 if at first insn of basic block. */
static rtx prev_insn;
static rtx this_insn_cc0, prev_insn_cc0;
static enum machine_mode this_insn_cc0_mode, prev_insn_cc0_mode;
#endif
/* Insn being scanned. */
@ -900,7 +896,6 @@ new_basic_block (void)
}
#ifdef HAVE_cc0
prev_insn = 0;
prev_insn_cc0 = 0;
#endif
}
@ -4022,8 +4017,8 @@ cse_insn (rtx insn, rtx libcall_insn)
#ifdef HAVE_cc0
/* Records what this insn does to set CC0. */
rtx this_insn_cc0 = 0;
enum machine_mode this_insn_cc0_mode = VOIDmode;
this_insn_cc0 = 0;
this_insn_cc0_mode = VOIDmode;
#endif
rtx src_eqv = 0;
@ -5644,20 +5639,6 @@ cse_insn (rtx insn, rtx libcall_insn)
}
done:;
#ifdef HAVE_cc0
/* If the previous insn set CC0 and this insn no longer references CC0,
delete the previous insn. Here we use the fact that nothing expects CC0
to be valid over an insn, which is true until the final pass. */
if (prev_insn && NONJUMP_INSN_P (prev_insn)
&& (tem = single_set (prev_insn)) != 0
&& SET_DEST (tem) == cc0_rtx
&& ! reg_mentioned_p (cc0_rtx, x))
delete_insn_and_edges (prev_insn);
prev_insn_cc0 = this_insn_cc0;
prev_insn_cc0_mode = this_insn_cc0_mode;
prev_insn = insn;
#endif
}
/* Remove from the hash table all expressions that reference memory. */
@ -6096,19 +6077,39 @@ cse_extended_basic_block (struct cse_basic_block_data *ebb_data)
&& for_each_rtx (&PATTERN (insn), check_for_label_ref,
(void *) insn))
recorded_label_ref = 1;
#ifdef HAVE_cc0
/* If the previous insn set CC0 and this insn no longer
references CC0, delete the previous insn. Here we use
fact that nothing expects CC0 to be valid over an insn,
which is true until the final pass. */
{
rtx prev_insn, tem;
prev_insn = PREV_INSN (insn);
if (prev_insn && NONJUMP_INSN_P (prev_insn)
&& (tem = single_set (prev_insn)) != 0
&& SET_DEST (tem) == cc0_rtx
&& ! reg_mentioned_p (cc0_rtx, PATTERN (insn)))
delete_insn (prev_insn);
}
/* If this insn is not the last insn in the basic block,
it will be PREV_INSN(insn) in the next iteration. If
we recorded any CC0-related information for this insn,
remember it. */
if (insn != BB_END (bb))
{
prev_insn_cc0 = this_insn_cc0;
prev_insn_cc0_mode = this_insn_cc0_mode;
}
#endif
}
}
/* Make sure that libcalls don't span multiple basic blocks. */
gcc_assert (libcall_insn == NULL_RTX);
#ifdef HAVE_cc0
/* Clear the CC0-tracking related insns, they can't provide
useful information across basic block boundaries. */
prev_insn_cc0 = 0;
prev_insn = 0;
#endif
/* If we changed a conditional jump, we may have terminated
the path we are following. Check that by verifying that
the edge we would take still exists. If the edge does
@ -6133,6 +6134,12 @@ cse_extended_basic_block (struct cse_basic_block_data *ebb_data)
bool taken = (next_bb == BRANCH_EDGE (bb)->dest);
record_jump_equiv (insn, taken);
}
#ifdef HAVE_cc0
/* Clear the CC0-tracking related insns, they can't provide
useful information across basic block boundaries. */
prev_insn_cc0 = 0;
#endif
}
gcc_assert (next_qty <= max_qty);