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alias.h (ALIAS_SET_MEMORY_BARRIER): New.

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* alias.h (ALIAS_SET_MEMORY_BARRIER): New.
        * alias.c (true_dependence): Respect it.
        (canon_true_dependence, write_dependence_p): Likewise.
        * builtins.c (get_builtin_sync_mem): Set it.

From-SVN: r110189
This commit is contained in:
Richard Henderson 2006-01-24 15:48:17 -08:00 • committed by Richard Henderson
parent 7faaba2884
commit 9cd9e512cb
4 changed files with 25 additions and 2 deletions
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7
gcc/ChangeLog
View file

@ -1,3 +1,10 @@
2006-01-24 Richard Henderson <rth@redehat.com>
* alias.h (ALIAS_SET_MEMORY_BARRIER): New.
* alias.c (true_dependence): Respect it.
(canon_true_dependence, write_dependence_p): Likewise.
* builtins.c (get_builtin_sync_mem): Set it.
2006-01-25 Zdenek Dvorak <dvorakz@suse.cz>
* loop-iv.c (iv_analysis_loop_init): Use df analysis in a more

11
gcc/alias.c
View file

@ -1,5 +1,5 @@
/* Alias analysis for GNU C
Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005
Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006
Free Software Foundation, Inc.
Contributed by John Carr (jfc@mit.edu).
@ -2209,6 +2209,9 @@ true_dependence (rtx mem, enum machine_mode mem_mode, rtx x,
return 1;
if (GET_MODE (mem) == BLKmode && GET_CODE (XEXP (mem, 0)) == SCRATCH)
return 1;
if (MEM_ALIAS_SET (x) == ALIAS_SET_MEMORY_BARRIER
|| MEM_ALIAS_SET (mem) == ALIAS_SET_MEMORY_BARRIER)
return 1;
if (DIFFERENT_ALIAS_SETS_P (x, mem))
return 0;
@ -2282,6 +2285,9 @@ canon_true_dependence (rtx mem, enum machine_mode mem_mode, rtx mem_addr,
return 1;
if (GET_MODE (mem) == BLKmode && GET_CODE (XEXP (mem, 0)) == SCRATCH)
return 1;
if (MEM_ALIAS_SET (x) == ALIAS_SET_MEMORY_BARRIER
|| MEM_ALIAS_SET (mem) == ALIAS_SET_MEMORY_BARRIER)
return 1;
if (DIFFERENT_ALIAS_SETS_P (x, mem))
return 0;
@ -2341,6 +2347,9 @@ write_dependence_p (rtx mem, rtx x, int writep)
return 1;
if (GET_MODE (mem) == BLKmode && GET_CODE (XEXP (mem, 0)) == SCRATCH)
return 1;
if (MEM_ALIAS_SET (x) == ALIAS_SET_MEMORY_BARRIER
|| MEM_ALIAS_SET (mem) == ALIAS_SET_MEMORY_BARRIER)
return 1;
if (DIFFERENT_ALIAS_SETS_P (x, mem))
return 0;

6
gcc/alias.h
View file

@ -27,4 +27,10 @@ extern HOST_WIDE_INT get_frame_alias_set (void);
extern void record_base_value (unsigned int, rtx, int);
extern bool component_uses_parent_alias_set (tree);
/* This alias set can be used to force a memory to conflict with all
other memories, creating a barrier across which no memory reference
can move. Note that there are other legacy ways to create such
memory barriers, including an address of SCRATCH. */
#define ALIAS_SET_MEMORY_BARRIER ((HOST_WIDE_INT) -1)
#endif /* GCC_ALIAS_H */

3
gcc/builtins.c
View file

@ -1,6 +1,6 @@
/* Expand builtin functions.
Copyright (C) 1988, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999,
2000, 2001, 2002, 2003, 2004, 2005 Free Software Foundation, Inc.
2000, 2001, 2002, 2003, 2004, 2005, 2006 Free Software Foundation, Inc.
This file is part of GCC.
@ -5406,6 +5406,7 @@ get_builtin_sync_mem (tree loc, enum machine_mode mode)
mem = validize_mem (gen_rtx_MEM (mode, addr));
set_mem_align (mem, get_pointer_alignment (loc, BIGGEST_ALIGNMENT));
set_mem_alias_set (mem, ALIAS_SET_MEMORY_BARRIER);
MEM_VOLATILE_P (mem) = 1;
return mem;