diff options
| author | Richard Henderson <rth@redhat.com> | 2006-01-24 15:48:17 -0800 |
|---|---|---|
| committer | Richard Henderson <rth@gcc.gnu.org> | 2006-01-24 15:48:17 -0800 |
| commit | 9cd9e512cb50cc49de86f397e716279286712f82 (patch) | |
| tree | 0827a234c38b01dc573baa50665e2f3c2f1afe68 | |
| parent | 7faaba2884bb256dc3e2c9addd5357fbde4e2c9c (diff) | |
| download | gcc-9cd9e512cb50cc49de86f397e716279286712f82.tar.gz | |
alias.h (ALIAS_SET_MEMORY_BARRIER): New.
* 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
| -rw-r--r-- | gcc/ChangeLog | 7 | ||||
| -rw-r--r-- | gcc/alias.c | 11 | ||||
| -rw-r--r-- | gcc/alias.h | 6 | ||||
| -rw-r--r-- | gcc/builtins.c | 3 |
4 files changed, 25 insertions, 2 deletions
diff --git a/gcc/ChangeLog b/gcc/ChangeLog index 6614b548b2a..62a3fc7def6 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -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 diff --git a/gcc/alias.c b/gcc/alias.c index 48060199092..68dff253abf 100644 --- a/gcc/alias.c +++ b/gcc/alias.c @@ -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; diff --git a/gcc/alias.h b/gcc/alias.h index c9154b3e58f..83cc2d55094 100644 --- a/gcc/alias.h +++ b/gcc/alias.h @@ -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 */ diff --git a/gcc/builtins.c b/gcc/builtins.c index 2d4322f9700..896fc48a4de 100644 --- a/gcc/builtins.c +++ b/gcc/builtins.c @@ -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; |