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gcse.c (can_assign_to_reg_p): New function, split out from...

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* gcse.c (can_assign_to_reg_p): New function, split out from...
	(want_to_gcse_p): ...here.
	(compute_ld_motion_mems): Use can_assign_to_reg_p to validate
	the rhs of a store.

From-SVN: r79856
This commit is contained in:
Richard Sandiford 2004-03-23 09:33:30 +00:00 committed by Richard Sandiford
parent 63185fabba
commit 1707bafaa5
2 changed files with 23 additions and 6 deletions
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7
gcc/ChangeLog
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@ -1,3 +1,10 @@
2004-03-23 Richard Sandiford <rsandifo@redhat.com>
* gcse.c (can_assign_to_reg_p): New function, split out from...
(want_to_gcse_p): ...here.
(compute_ld_motion_mems): Use can_assign_to_reg_p to validate
the rhs of a store.
2004-03-22 Diego Novillo <dnovillo@redhat.com>
* c-typeck.c (same_translation_unit_p): Fix pasto.

22
gcc/gcse.c
View File

@ -568,6 +568,7 @@ static void hash_scan_set (rtx, rtx, struct hash_table *);
static void hash_scan_clobber (rtx, rtx, struct hash_table *);
static void hash_scan_call (rtx, rtx, struct hash_table *);
static int want_to_gcse_p (rtx);
static bool can_assign_to_reg_p (rtx);
static bool gcse_constant_p (rtx);
static int oprs_unchanged_p (rtx, rtx, int);
static int oprs_anticipatable_p (rtx, rtx);
@ -1269,13 +1270,9 @@ static basic_block current_bb;
/* See whether X, the source of a set, is something we want to consider for
GCSE. */
static GTY(()) rtx test_insn;
static int
want_to_gcse_p (rtx x)
{
int num_clobbers = 0;
int icode;
switch (GET_CODE (x))
{
case REG:
@ -1288,8 +1285,21 @@ want_to_gcse_p (rtx x)
return 0;
default:
break;
return can_assign_to_reg_p (x);
}
}
/* Used internally by can_assign_to_reg_p. */
static GTY(()) rtx test_insn;
/* Return true if we can assign X to a pseudo register. */
static bool
can_assign_to_reg_p (rtx x)
{
int num_clobbers = 0;
int icode;
/* If this is a valid operand, we are OK. If it's VOIDmode, we aren't. */
if (general_operand (x, GET_MODE (x)))
@ -6838,7 +6848,7 @@ compute_ld_motion_mems (void)
&& GET_CODE (src) != ASM_OPERANDS
/* Check for REG manually since want_to_gcse_p
returns 0 for all REGs. */
&& (REG_P (src) || want_to_gcse_p (src)))
&& can_assign_to_reg_p (src))
ptr->stores = alloc_INSN_LIST (insn, ptr->stores);
else
ptr->invalid = 1;