Quoting Michael Matz <m...@suse.de>:
That's not good. You now have different order of parameters between
anti_dependence and canon_anti_dependence. That will be mightily
confusing, please instead change the caller. Currently these predicates
take their arguments in the order of the corresponding instructions, that
should better be retained:
true_dependence: write-then-(depending)read
anti_dependence: read-then-(clobbering)write
write_dependence: write-then-(clobbering)write
All right, attached is the patch with the arguments in instruction-order.
Again, bootstrapped/regtested on i686-pc-linux-gnu .
2013-06-19 Joern Rennecke <joern.renne...@embecosm.com>
PR rtl-optimization/57425
PR rtl-optimization/57569
* alias.c (write_dependence_p): Remove parameters mem_mode and
canon_mem_addr. Add parameters x_mode, x_addr and x_canonicalized.
Changed all callers.
(canon_anti_dependence): Get comments and semantics in sync.
Add parameter mem_canonicalized. Changed all callers.
* rtl.h (canon_anti_dependence): Update prototype.
Index: alias.c
===================================================================
--- alias.c (revision 200133)
+++ alias.c (working copy)
@@ -156,8 +156,9 @@ static int insert_subset_children (splay
static alias_set_entry get_alias_set_entry (alias_set_type);
static bool nonoverlapping_component_refs_p (const_rtx, const_rtx);
static tree decl_for_component_ref (tree);
-static int write_dependence_p (const_rtx, enum machine_mode, rtx, const_rtx,
- bool, bool);
+static int write_dependence_p (const_rtx,
+ const_rtx, enum machine_mode, rtx,
+ bool, bool, bool);
static void memory_modified_1 (rtx, const_rtx, void *);
@@ -2555,20 +2556,22 @@ canon_true_dependence (const_rtx mem, en
/* Returns nonzero if a write to X might alias a previous read from
(or, if WRITEP is true, a write to) MEM.
- If MEM_CANONCALIZED is nonzero, CANON_MEM_ADDR is the canonicalized
- address of MEM, and MEM_MODE the mode for that access. */
+ If X_CANONCALIZED is true, then X_ADDR is the canonicalized address of X,
+ and X_MODE the mode for that access.
+ If MEM_CANONICALIZED is true, MEM is canonicalized. */
static int
-write_dependence_p (const_rtx mem, enum machine_mode mem_mode,
- rtx canon_mem_addr, const_rtx x,
- bool mem_canonicalized, bool writep)
+write_dependence_p (const_rtx mem,
+ const_rtx x, enum machine_mode x_mode, rtx x_addr,
+ bool mem_canonicalized, bool x_canonicalized, bool writep)
{
- rtx x_addr, mem_addr;
+ rtx mem_addr;
rtx base;
int ret;
- gcc_checking_assert (mem_canonicalized ? (canon_mem_addr != NULL_RTX)
- : (canon_mem_addr == NULL_RTX && mem_mode == VOIDmode));
+ gcc_checking_assert (x_canonicalized
+ ? (x_addr != NULL_RTX && x_mode != VOIDmode)
+ : (x_addr == NULL_RTX && x_mode == VOIDmode));
if (MEM_VOLATILE_P (x) && MEM_VOLATILE_P (mem))
return 1;
@@ -2593,17 +2596,21 @@ write_dependence_p (const_rtx mem, enum
if (MEM_ADDR_SPACE (mem) != MEM_ADDR_SPACE (x))
return 1;
- x_addr = XEXP (x, 0);
mem_addr = XEXP (mem, 0);
- if (!((GET_CODE (x_addr) == VALUE
- && GET_CODE (mem_addr) != VALUE
- && reg_mentioned_p (x_addr, mem_addr))
- || (GET_CODE (x_addr) != VALUE
- && GET_CODE (mem_addr) == VALUE
- && reg_mentioned_p (mem_addr, x_addr))))
+ if (!x_addr)
{
- x_addr = get_addr (x_addr);
- mem_addr = get_addr (mem_addr);
+ x_addr = XEXP (x, 0);
+ if (!((GET_CODE (x_addr) == VALUE
+ && GET_CODE (mem_addr) != VALUE
+ && reg_mentioned_p (x_addr, mem_addr))
+ || (GET_CODE (x_addr) != VALUE
+ && GET_CODE (mem_addr) == VALUE
+ && reg_mentioned_p (mem_addr, x_addr))))
+ {
+ x_addr = get_addr (x_addr);
+ if (!mem_canonicalized)
+ mem_addr = get_addr (mem_addr);
+ }
}
base = find_base_term (mem_addr);
@@ -2619,17 +2626,16 @@ write_dependence_p (const_rtx mem, enum
GET_MODE (mem)))
return 0;
- x_addr = canon_rtx (x_addr);
- if (mem_canonicalized)
- mem_addr = canon_mem_addr;
- else
+ if (!x_canonicalized)
{
- mem_addr = canon_rtx (mem_addr);
- mem_mode = GET_MODE (mem);
+ x_addr = canon_rtx (x_addr);
+ x_mode = GET_MODE (x);
}
+ if (!mem_canonicalized)
+ mem_addr = canon_rtx (mem_addr);
- if ((ret = memrefs_conflict_p (GET_MODE_SIZE (mem_mode), mem_addr,
- SIZE_FOR_MODE (x), x_addr, 0)) != -1)
+ if ((ret = memrefs_conflict_p (SIZE_FOR_MODE (mem), mem_addr,
+ GET_MODE_SIZE (x_mode), x_addr, 0)) != -1)
return ret;
if (nonoverlapping_memrefs_p (x, mem, false))
@@ -2643,20 +2649,23 @@ write_dependence_p (const_rtx mem, enum
int
anti_dependence (const_rtx mem, const_rtx x)
{
- return write_dependence_p (mem, VOIDmode, NULL_RTX, x,
- /*mem_canonicalized=*/false, /*writep=*/false);
+ return write_dependence_p (mem, x, VOIDmode, NULL_RTX,
+ /*mem_canonicalized=*/false,
+ /*x_canonicalized*/false, /*writep=*/false);
}
-/* Likewise, but we already have a canonicalized MEM_ADDR for MEM.
- Also, consider MEM in MEM_MODE (which might be from an enclosing
- STRICT_LOW_PART / ZERO_EXTRACT). */
+/* Likewise, but we already have a canonicalized MEM, and X_ADDR for X.
+ Also, consider X in X_MODE (which might be from an enclosing
+ STRICT_LOW_PART / ZERO_EXTRACT).
+ If MEM_CANONICALIZED is true, MEM is canonicalized. */
int
-canon_anti_dependence (const_rtx mem, enum machine_mode mem_mode,
- rtx mem_addr, const_rtx x)
+canon_anti_dependence (const_rtx mem, bool mem_canonicalized,
+ const_rtx x, enum machine_mode x_mode, rtx x_addr)
{
- return write_dependence_p (mem, mem_mode, mem_addr, x,
- /*mem_canonicalized=*/true, /*writep=*/false);
+ return write_dependence_p (mem, x, x_mode, x_addr,
+ mem_canonicalized, /*x_canonicalized=*/true,
+ /*writep=*/false);
}
/* Output dependence: X is written after store in MEM takes place. */
@@ -2664,8 +2673,9 @@ canon_anti_dependence (const_rtx mem, en
int
output_dependence (const_rtx mem, const_rtx x)
{
- return write_dependence_p (mem, VOIDmode, NULL_RTX, x,
- /*mem_canonicalized=*/false, /*writep=*/true);
+ return write_dependence_p (mem, x, VOIDmode, NULL_RTX,
+ /*mem_canonicalized=*/false,
+ /*x_canonicalized*/false, /*writep=*/true);
}
Index: cse.c
===================================================================
--- cse.c (revision 200133)
+++ cse.c (working copy)
@@ -1837,7 +1837,7 @@ check_dependence (rtx *x, void *data)
{
struct check_dependence_data *d = (struct check_dependence_data *) data;
if (*x && MEM_P (*x))
- return canon_anti_dependence (d->exp, d->mode, d->addr, *x);
+ return canon_anti_dependence (*x, true, d->exp, d->mode, d->addr);
else
return 0;
}
Index: cselib.c
===================================================================
--- cselib.c (revision 200133)
+++ cselib.c (working copy)
@@ -2263,8 +2263,8 @@ cselib_invalidate_mem (rtx mem_rtx)
continue;
}
if (num_mems < PARAM_VALUE (PARAM_MAX_CSELIB_MEMORY_LOCATIONS)
- && ! canon_anti_dependence (mem_rtx, GET_MODE (mem_rtx),
- mem_addr, x))
+ && ! canon_anti_dependence (x, false, mem_rtx,
+ GET_MODE (mem_rtx), mem_addr))
{
has_mem = true;
num_mems++;
Index: rtl.h
===================================================================
--- rtl.h (revision 200133)
+++ rtl.h (working copy)
@@ -2705,8 +2705,8 @@ extern int canon_true_dependence (const_
const_rtx, rtx);
extern int read_dependence (const_rtx, const_rtx);
extern int anti_dependence (const_rtx, const_rtx);
-extern int canon_anti_dependence (const_rtx, enum machine_mode, rtx,
- const_rtx);
+extern int canon_anti_dependence (const_rtx, bool,
+ const_rtx, enum machine_mode, rtx);
extern int output_dependence (const_rtx, const_rtx);
extern int may_alias_p (const_rtx, const_rtx);
extern void init_alias_target (void);
