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re PR c/7344 (performance regression on huge case statements)

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* calls.c (expand_call): Simplify noreturn call.

	PR c/7344
	* cfgbuild.c (make_edges): Create edge cache when we do have
	large jumptable.
	(do_tablejump): Note size of maximal jumptable.
	* function.c (prepare_function_start): Zero out size.
	* function.h (function): Add max_jumptable_ents.

	* cfgcleanup.c (insn_match_p): Verify sibcall flag for calls to.

From-SVN: r58063
This commit is contained in:
Jan Hubicka 2002-10-11 22:26:50 +02:00 committed by Jan Hubicka
parent ca91148bcd
commit db6556348d
6 changed files with 24 additions and 5 deletions
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13
gcc/ChangeLog
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@ -1,3 +1,16 @@
Fri Oct 11 22:22:38 CEST 2002 Jan Hubicka <jh@suse.cz>
* calls.c (expand_call): Simplify noreturn call.
PR c/7344
* cfgbuild.c (make_edges): Create edge cache when we do have
large jumptable.
(do_tablejump): Note size of maximal jumptable.
* function.c (prepare_function_start): Zero out size.
* function.h (function): Add max_jumptable_ents.
* cfgcleanup.c (insn_match_p): Verify sibcall flag for calls to.
Fri Oct 11 12:34:33 2002 J"orn Rennecke <joern.rennecke@superh.com>
* sh.md (movv8qi_i+2): For V8QI destinations, generate V4HI

3
gcc/calls.c
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@ -2459,8 +2459,7 @@ expand_call (exp, target, ignore)
reload insns generated to fix things up would appear
before the sibcall_epilogue. */
|| fndecl == NULL_TREE
|| (flags & (ECF_RETURNS_TWICE | ECF_LONGJMP))
|| TREE_THIS_VOLATILE (fndecl)
|| (flags & (ECF_RETURNS_TWICE | ECF_LONGJMP | ECF_NORETURN))
|| !FUNCTION_OK_FOR_SIBCALL (fndecl)
/* If this function requires more stack slots than the current
function, we cannot change it into a sibling call. */

2
gcc/cfgbuild.c
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@ -292,7 +292,7 @@ make_edges (label_value_list, min, max, update_p)
/* Heavy use of computed goto in machine-generated code can lead to
nearly fully-connected CFGs. In that case we spend a significant
amount of time searching the edge lists for duplicates. */
if (forced_labels || label_value_list)
if (forced_labels || label_value_list || cfun->max_jumptable_ents > 100)
{
edge_cache = sbitmap_vector_alloc (last_basic_block, last_basic_block);
sbitmap_vector_zero (edge_cache, last_basic_block);

5
gcc/cfgcleanup.c
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@ -911,8 +911,9 @@ insns_match_p (mode, i1, i2)
equal, they were constructed identically. */
if (GET_CODE (i1) == CALL_INSN
&& !rtx_equal_p (CALL_INSN_FUNCTION_USAGE (i1),
CALL_INSN_FUNCTION_USAGE (i2)))
&& (!rtx_equal_p (CALL_INSN_FUNCTION_USAGE (i1),
CALL_INSN_FUNCTION_USAGE (i2))
|| SIBLING_CALL_P (i1) != SIBLING_CALL_P (i2)))
return false;
#ifdef STACK_REGS

2
gcc/function.c
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@ -6295,6 +6295,8 @@ prepare_function_start ()
cfun->function_frequency = FUNCTION_FREQUENCY_NORMAL;
cfun->max_jumptable_ents = 0;
(*lang_hooks.function.init) (cfun);
if (init_machine_status)
cfun->machine = (*init_machine_status) ();

4
gcc/function.h
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@ -500,6 +500,10 @@ struct function GTY(())
(set only when profile feedback is available). */
FUNCTION_FREQUENCY_HOT
} function_frequency;
/* Maximal number of entities in the single jumptable. Used to estimate
final flowgraph size. */
int max_jumptable_ents;
};
/* The function currently being compiled. */