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jump.c (condjump_p): Mark as depreached.

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* jump.c (condjump_p):  Mark as depreached.
	(any_condump_p): New.
	(any_uncondump_p): New.
	(pc_set): New.
	(safe_to_remove_jump_p): New.
	* rtl.h (any_condump_p, any_uncondjump_p, pc_set
	safe_to_remove_jump_p): Declare.

From-SVN: r33914
This commit is contained in:
Jan Hubicka 2000-05-15 19:53:07 +00:00 committed by Jan Hubicka
parent 099e9712f1
commit e4c8581657
3 changed files with 99 additions and 2 deletions
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10
gcc/ChangeLog
View File

@ -1,3 +1,13 @@
Mon May 15 21:45:36 MET DST 2000 Jan Hubicka <jh@suse.cz>
* jump.c (condjump_p): Mark as depreached.
(any_condump_p): New.
(any_uncondump_p): New.
(pc_set): New.
(safe_to_remove_jump_p): New.
* rtl.h (any_condump_p, any_uncondjump_p, pc_set
safe_to_remove_jump_p): Declare.
Mon May 15 21:07:20 MET DST 2000 Jan Hubicka <jh@suse.cz>
* calls.c: Re-install both patches reverted by last patch.

87
gcc/jump.c
View File

@ -2097,7 +2097,12 @@ simplejump_p (insn)
}
/* Return nonzero if INSN is a (possibly) conditional jump
and nothing more. */
and nothing more.
Use this function is depreached, since we need to support
branch and compare insns. Use nontrivial_condjump_p instead
whenever possible.
*/
int
condjump_p (insn)
@ -2124,7 +2129,12 @@ condjump_p (insn)
}
/* Return nonzero if INSN is a (possibly) conditional jump inside a
PARALLEL. */
PARALLEL.
Use this function is depreached, since we need to support
branch and compare insns. Use any_condjump_p instead
whenever possible.
*/
int
condjump_in_parallel_p (insn)
@ -2156,6 +2166,79 @@ condjump_in_parallel_p (insn)
return 0;
}
/* Return set of PC if available NULL otherwise. */
rtx
pc_set (insn)
rtx insn;
{
rtx pat;
if (GET_CODE (insn) != JUMP_INSN)
return NULL;
pat = PATTERN (insn);
/* The set is allowed to appear eighter as insn pattern or the first in
PARALLEL expression. */
if (GET_CODE (pat) == SET && GET_CODE (SET_DEST (pat)) == PC)
return pat;
if (GET_CODE (pat) == PARALLEL)
{
rtx set = XVECEXP (pat, 0, 0);
if (GET_CODE (set) == SET && GET_CODE (SET_DEST (set)) == PC)
return set;
}
return NULL;
}
/* Return true when insn in unconditional jump possibly boundled inside
PARALLEL. */
int
any_uncondjump_p (insn)
rtx insn;
{
rtx x = pc_set (insn);
if (!x)
return 0;
if (GET_CODE (SET_SRC (x)) != LABEL_REF)
return 0;
return 1;
}
/* Return true when insn is conditional jump. This function work for
instructions containing PC sets in PARALLELs. The instruction may have
various other effects so before removing the jump you must verify
safe_to_remove_jump_p.
Note that unlike condjump_p it returns 0 for unconditionals jumps.
*/
int
any_condjump_p (insn)
rtx insn;
{
rtx x = pc_set (insn);
if (!x)
return 0;
if (XEXP (SET_SRC (x), 2) == pc_rtx
&& (GET_CODE (XEXP (SET_SRC (x), 1)) == LABEL_REF
|| GET_CODE (XEXP (SET_SRC (x), 1)) == RETURN))
return 1;
if (XEXP (SET_SRC (x), 1) == pc_rtx
&& (GET_CODE (XEXP (SET_SRC (x), 2)) == LABEL_REF
|| GET_CODE (XEXP (SET_SRC (x), 2)) == RETURN))
return 1;
return 0;
}
/* Return true when the condjump is safe to remove. */
int
safe_to_remove_jump_p (insn)
rtx insn;
{
/* For non-single set insns we may remove set of the other registers. */
if (!pc_set (insn) || !single_set (insn))
return 0;
return 1;
}
/* Return the label of a conditional jump. */
rtx

4
gcc/rtl.h
View File

@ -1511,6 +1511,10 @@ extern void cse_end_of_basic_block PARAMS ((rtx,
/* In jump.c */
extern int comparison_dominates_p PARAMS ((enum rtx_code, enum rtx_code));
extern int condjump_p PARAMS ((rtx));
extern int any_condjump_p PARAMS ((rtx));
extern int any_uncondjump_p PARAMS ((rtx));
extern int safe_to_remove_jump_p PARAMS ((rtx));
extern rtx pc_set PARAMS ((rtx));
extern rtx condjump_label PARAMS ((rtx));
extern int simplejump_p PARAMS ((rtx));
extern int returnjump_p PARAMS ((rtx));