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rtl.h (struct rtx_def): Document unchanging and in_struct flags more accurately.

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2002-05-09  David S. Miller  <davem@redhat.com>

	* rtl.h (struct rtx_def): Document unchanging and in_struct flags
	more accurately.
	(INSN_ANNULLED_BRANCH_P): Only valid for JUMP_INSN and CALL_INSN, fix
	comment.
	(INSN_FROM_TARGET_P): Valid also for CALL_INSN.
	* doc/rtl.texi: Document these macros more accurately.
	* recog.c (whole file): Only mess with INSN_ANNULLED_BRANCH_P for
	JUMP_INSNs and CALL_INSNs.
	* resource.c (whole file): Only mess with INSN_ANNULLED_BRANCH_P
	or INSN_FROM_TARGET_P if the code is appropriate.

From-SVN: r53360
This commit is contained in:
David S. Miller 2002-05-10 05:50:11 -07:00 committed by David S. Miller
parent 1a499b9250
commit cf40ea15f6
5 changed files with 49 additions and 25 deletions
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13
gcc/ChangeLog
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@ -1,3 +1,16 @@
2002-05-09 David S. Miller <davem@redhat.com>
* rtl.h (struct rtx_def): Document unchanging and in_struct flags
more accurately.
(INSN_ANNULLED_BRANCH_P): Only valid for JUMP_INSN and CALL_INSN, fix
comment.
(INSN_FROM_TARGET_P): Valid also for CALL_INSN.
* doc/rtl.texi: Document these macros more accurately.
* recog.c (whole file): Only mess with INSN_ANNULLED_BRANCH_P for
JUMP_INSNs and CALL_INSNs.
* resource.c (whole file): Only mess with INSN_ANNULLED_BRANCH_P
or INSN_FROM_TARGET_P if the code is appropriate.
2002-05-10 Marek Michalkiewicz <marekm@amelek.gda.pl>
* config/avr/avr.c (print_operand): Check that addr is a SYMBOL_REF

19
gcc/doc/rtl.texi
View File

@ -395,15 +395,13 @@ indicates that the insn represents a call to a const or pure function.
Stored in the @code{unchanging} field and printed as @samp{/u}.
@findex INSN_ANNULLED_BRANCH_P
@cindex @code{insn} and @samp{/u}
@cindex @code{jump_insn} and @samp{/u}
@cindex @code{unchanging}, in @code{insn} and @code{jump_insn}
@cindex @code{call_insn} and @samp{/u}
@cindex @code{unchanging}, in @code{jump_insn} and @code{call_insn}
@item INSN_ANNULLED_BRANCH_P (@var{x})
In an @code{insn} or @code{jump_insn} in the delay slot of a branch insn,
indicates that an
annulling branch should be used. See the discussion under
@code{sequence} below. Stored in the @code{unchanging} field and printed
as @samp{/u}.
In a @code{jump_insn} or @code{call_insn} indicates that the branch is
an annulling one. See the discussion under @code{sequence} below.
Stored in the @code{unchanging} field and printed as @samp{/u}.
@findex INSN_DEAD_CODE_P
@cindex @code{insn} and @samp{/s}
@ -430,10 +428,11 @@ nonzero if the insn has been deleted. Stored in the
@findex INSN_FROM_TARGET_P
@cindex @code{insn} and @samp{/s}
@cindex @code{jump_insn} and @samp{/s}
@cindex @code{in_struct}, in @code{insn} and @code{jump_insn}
@cindex @code{call_insn} and @samp{/s}
@cindex @code{in_struct}, in @code{insn} and @code{jump_insn} and @code{call_insn}
@item INSN_FROM_TARGET_P (@var{x})
In an @code{insn} or @code{jump_insn} in a delay slot of a branch,
indicates that the insn
In an @code{insn} or @code{jump_insn} or @code{call_insn} in a delay
slot of a branch, indicates that the insn
is from the target of the branch. If the branch insn has
@code{INSN_ANNULLED_BRANCH_P} set, this insn will only be executed if
the branch is taken. For annulled branches with

7
gcc/reorg.c
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@ -617,7 +617,8 @@ delete_from_delay_slot (insn)
annul flag. */
if (delay_list)
trial = emit_delay_sequence (trial, delay_list, XVECLEN (seq, 0) - 2);
else
else if (GET_CODE (trial) == JUMP_INSN
|| GET_CODE (trial) == CALL_INSN)
INSN_ANNULLED_BRANCH_P (trial) = 0;
INSN_FROM_TARGET_P (insn) = 0;
@ -3628,7 +3629,9 @@ dbr_schedule (first, file)
{
rtx target;
INSN_ANNULLED_BRANCH_P (insn) = 0;
if (GET_CODE (insn) == JUMP_INSN
|| GET_CODE (insn) == CALL_INSN)
INSN_ANNULLED_BRANCH_P (insn) = 0;
INSN_FROM_TARGET_P (insn) = 0;
/* Skip vector tables. We can't get attributes for them. */

23
gcc/resource.c
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@ -175,10 +175,21 @@ next_insn_no_annul (insn)
{
/* If INSN is an annulled branch, skip any insns from the target
of the branch. */
if (INSN_ANNULLED_BRANCH_P (insn)
if (GET_CODE (insn) == JUMP_INSN
&& INSN_ANNULLED_BRANCH_P (insn)
&& NEXT_INSN (PREV_INSN (insn)) != insn)
while (INSN_FROM_TARGET_P (NEXT_INSN (insn)))
insn = NEXT_INSN (insn);
{
rtx next = NEXT_INSN (insn);
enum rtx_code code = GET_CODE (next);
while ((code == INSN || code == JUMP_INSN || code == CALL_INSN)
&& INSN_FROM_TARGET_P (next))
{
insn = next;
next = NEXT_INSN (insn);
code = GET_CODE (next);
}
}
insn = NEXT_INSN (insn);
if (insn && GET_CODE (insn) == INSN
@ -1007,16 +1018,18 @@ mark_target_live_regs (insns, target, res)
{
rtx link;
rtx real_insn = insn;
enum rtx_code code = GET_CODE (insn);
/* If this insn is from the target of a branch, it isn't going to
be used in the sequel. If it is used in both cases, this
test will not be true. */
if (INSN_FROM_TARGET_P (insn))
if ((code == INSN || code == JUMP_INSN || code == CALL_INSN)
&& INSN_FROM_TARGET_P (insn))
continue;
/* If this insn is a USE made by update_block, we care about the
underlying insn. */
if (GET_CODE (insn) == INSN && GET_CODE (PATTERN (insn)) == USE
if (code == INSN && GET_CODE (PATTERN (insn)) == USE
&& INSN_P (XEXP (PATTERN (insn), 0)))
real_insn = XEXP (PATTERN (insn), 0);

12
gcc/rtl.h
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@ -140,8 +140,7 @@ struct rtx_def
1 in a SYMBOL_REF if it addresses something in the per-function
constants pool.
1 in a CALL_INSN, NOTE, or EXPR_LIST for a const or pure call.
1 in an INSN in the delay slot of a branch insn if an annulling branch
should be used. */
1 in a JUMP_INSN or CALL_INSN of an annulling branch. */
unsigned int unchanging : 1;
/* 1 in a MEM or ASM_OPERANDS expression if the memory reference is volatile.
1 in an INSN, CALL_INSN, JUMP_INSN, CODE_LABEL, BARRIER, or NOTE
@ -168,7 +167,6 @@ struct rtx_def
1 in an INSN, JUMP_INSN, or CALL_INSN if insn is in a delay slot and
from the target of a branch. Valid from reorg until end of compilation;
cleared before used.
1 in an INSN in a delay slot that is the target of a branch, during reorg.
1 in an INSN or related rtx if this insn is dead code. Valid only during
dead-code elimination phase; cleared before use. */
unsigned int in_struct : 1;
@ -539,11 +537,9 @@ do { \
#define SIBLING_CALL_P(RTX) \
(RTL_FLAG_CHECK1("SIBLING_CALL_P", (RTX), CALL_INSN)->jump)
/* 1 if RTX is an insn in the delay slot of a branch insn for which an
annulling branch should be used. */
/* 1 if RTX is an insn that is an annulling branch. */
#define INSN_ANNULLED_BRANCH_P(RTX) \
(RTL_FLAG_CHECK2("INSN_ANNULLED_BRANCH_P", (RTX), INSN, \
JUMP_INSN)->unchanging)
(RTL_FLAG_CHECK2("INSN_ANNULLED_BRANCH_P", (RTX), JUMP_INSN, CALL_INSN)->unchanging)
/* 1 if RTX is an insn that is dead code. Valid only for dead-code
elimination phase. */
@ -555,7 +551,7 @@ do { \
executed if the branch is taken. For annulled branches with this bit
clear, the insn should be executed only if the branch is not taken. */
#define INSN_FROM_TARGET_P(RTX) \
(RTL_FLAG_CHECK2("INSN_FROM_TARGET_P", (RTX), INSN, JUMP_INSN)->in_struct)
(RTL_FLAG_CHECK3("INSN_FROM_TARGET_P", (RTX), INSN, JUMP_INSN, CALL_INSN)->in_struct)
#define ADDR_DIFF_VEC_FLAGS(RTX) X0ADVFLAGS(RTX, 4)