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rtl.h (PREFETCH_SCHEDULE_BARRIER_P): New macro.

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2009-09-07  Andreas Krebbel  <Andreas.Krebbel@de.ibm.com>

	* rtl.h (PREFETCH_SCHEDULE_BARRIER_P): New macro.	
	* sched-deps.c (sched_analyze_2): Make prefetches a hard barrier
	when volatile flag is set.
	* doc/rtl.texi (PREFETCH_SCHEDULE_BARRIER_P): Add documentation pieces.

From-SVN: r151475
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Andreas Krebbel 2009-09-07 10:30:32 +00:00 committed by Andreas Krebbel
parent 2dcbb2c0bf
commit 3fce100b40
4 changed files with 30 additions and 1 deletions
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7
gcc/ChangeLog
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@ -1,3 +1,10 @@
2009-09-07 Andreas Krebbel <Andreas.Krebbel@de.ibm.com>
* rtl.h (PREFETCH_SCHEDULE_BARRIER_P): New macro.
* sched-deps.c (sched_analyze_2): Make prefetches a hard barrier
when volatile flag is set.
* doc/rtl.texi (PREFETCH_SCHEDULE_BARRIER_P): Add documentation pieces.
2009-09-06 Eric Botcazou <ebotcazou@adacore.com>
PR bootstrap/41241

11
gcc/doc/rtl.texi
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@ -882,6 +882,14 @@ Stored in the @code{volatil} field and printed as @samp{/v}.
Most uses of @code{SYMBOL_REF_FLAG} are historic and may be subsumed
by @code{SYMBOL_REF_FLAGS}. Certainly use of @code{SYMBOL_REF_FLAGS}
is mandatory if the target requires more than one bit of storage.
@findex PREFETCH_SCHEDULE_BARRIER_P
@cindex @code{prefetch} and @samp{/v}
@cindex @code{volatile}, in @code{prefetch}
@item PREFETCH_SCHEDULE_BARRIER_P (@var{x})
In a @code{prefetch}, indicates that the prefetch is a scheduling barrier.
No other INSNs will be moved over it.
Stored in the @code{volatil} field and printed as @samp{/v}.
@end table
These are the fields to which the above macros refer:
@ -1034,6 +1042,9 @@ In an @code{insn}, 1 means the insn has been deleted.
In @code{label_ref} and @code{reg_label} expressions, 1 means a reference
to a non-local label.
In @code{prefetch} expressions, 1 means that the containing insn is a
scheduling barrier.
In an RTL dump, this flag is represented as @samp{/v}.
@end table

8
gcc/rtl.h
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@ -271,7 +271,9 @@ struct GTY((chain_next ("RTX_NEXT (&%h)"),
1 in a SUBREG with a negative value.
1 in a LABEL_REF, REG_LABEL_TARGET or REG_LABEL_OPERAND note for a
non-local label.
In a SYMBOL_REF, this flag is used for machine-specific purposes. */
In a SYMBOL_REF, this flag is used for machine-specific purposes.
In a PREFETCH, this flag indicates that it should be considered a scheduling
barrier. */
unsigned int volatil : 1;
/* 1 in a MEM referring to a field of an aggregate.
0 if the MEM was a variable or the result of a * operator in C;
@ -1423,6 +1425,10 @@ do { \
offset within that block. */
#define SYMBOL_REF_BLOCK_OFFSET(RTX) (BLOCK_SYMBOL_CHECK (RTX)->offset)
/* True if RTX is flagged to be a scheduling barrier. */
#define PREFETCH_SCHEDULE_BARRIER_P(RTX) \
(RTL_FLAG_CHECK1("PREFETCH_SCHEDULE_BARRIER_P", (RTX), PREFETCH)->volatil)
/* Indicate whether the machine has any sort of auto increment addressing.
If not, we can avoid checking for REG_INC notes. */

5
gcc/sched-deps.c
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@ -2487,6 +2487,11 @@ sched_analyze_2 (struct deps *deps, rtx x, rtx insn)
flush_pending_lists (deps, insn, true, false);
break;
case PREFETCH:
if (PREFETCH_SCHEDULE_BARRIER_P (x))
reg_pending_barrier = TRUE_BARRIER;
break;
case UNSPEC_VOLATILE:
flush_pending_lists (deps, insn, true, true);
/* FALLTHRU */