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tree-ssa-operands.c (get_asm_expr_operands): Fix thinkos in the handling of clobbering ASM_EXPRs.

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* tree-ssa-operands.c (get_asm_expr_operands): Fix thinkos in
	the handling of clobbering ASM_EXPRs.

From-SVN: r84292
This commit is contained in:
Diego Novillo 2004-07-08 15:03:10 +00:00 committed by Diego Novillo
parent 6f2838e398
commit 7c35745cbf
2 changed files with 42 additions and 40 deletions
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5
gcc/ChangeLog
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@ -1,3 +1,8 @@
2004-07-08 Diego Novillo <dnovillo@redhat.com>
* tree-ssa-operands.c (get_asm_expr_operands): Fix thinkos in
the handling of clobbering ASM_EXPRs.
2004-07-08 Eric Botcazou <ebotcazou@libertysurf.fr>
PR target/16430

77
gcc/tree-ssa-operands.c
View File

@ -1164,8 +1164,9 @@ get_expr_operands (tree stmt, tree *expr_p, int flags, voperands_t prev_vops)
abort ();
}
/* Scan operands in ASM_EXPR STMT. PREV_VOPS is as in
append_v_may_def and append_vuse. */
/* Scan operands in ASM_EXPR STMT. PREV_VOPS is as in append_v_may_def and
append_vuse. */
static void
get_asm_expr_operands (tree stmt, voperands_t prev_vops)
@ -1223,47 +1224,43 @@ get_asm_expr_operands (tree stmt, voperands_t prev_vops)
get_expr_operands (stmt, &TREE_VALUE (link), 0, prev_vops);
}
/* Clobber memory for asm ("" : : : "memory"); */
if (!aliases_computed_p)
{
/* If we still have not computed aliasing information,
mark the statement as having volatile operands to avoid
optimizations from messing around with it. */
stmt_ann (stmt)->has_volatile_ops = true;
}
else
{
/* Otherwise, if this ASM_EXPR clobbers memory, clobber
all the call-clobbered variables and the addressable
variables found by the alias analyzer. */
for (link = ASM_CLOBBERS (stmt); link; link = TREE_CHAIN (link))
if (!strcmp (TREE_STRING_POINTER (TREE_VALUE (link)), "memory"))
for (link = ASM_CLOBBERS (stmt); link; link = TREE_CHAIN (link))
if (strcmp (TREE_STRING_POINTER (TREE_VALUE (link)), "memory") == 0)
{
size_t i;
/* If we still have not computed aliasing information, we
won't know what variables are call-clobbered and/or
addressable. Just mark the statement as having volatile
operands for now. */
if (!aliases_computed_p)
{
/* If we had created .GLOBAL_VAR earlier, use it.
Otherwise, add a V_MAY_DEF operand for every
call-clobbered and addressable variable. See
compute_may_aliases for the heuristic used to decide
whether to create .GLOBAL_VAR or not. */
if (global_var)
add_stmt_operand (&global_var, stmt, opf_is_def, prev_vops);
else
{
size_t i;
EXECUTE_IF_SET_IN_BITMAP (call_clobbered_vars, 0, i,
{
tree var = referenced_var (i);
add_stmt_operand (&var, stmt, opf_is_def, prev_vops);
});
EXECUTE_IF_SET_IN_BITMAP (addressable_vars, 0, i,
{
tree var = referenced_var (i);
add_stmt_operand (&var, stmt, opf_is_def, prev_vops);
});
}
stmt_ann (stmt)->has_volatile_ops = true;
break;
}
}
/* Clobber all call-clobbered variables (or .GLOBAL_VAR if we
decided to group them). */
if (global_var)
add_stmt_operand (&global_var, stmt, opf_is_def, prev_vops);
else
EXECUTE_IF_SET_IN_BITMAP (call_clobbered_vars, 0, i,
{
tree var = referenced_var (i);
add_stmt_operand (&var, stmt, opf_is_def, prev_vops);
});
/* Now clobber all addressables. */
EXECUTE_IF_SET_IN_BITMAP (addressable_vars, 0, i,
{
tree var = referenced_var (i);
add_stmt_operand (&var, stmt, opf_is_def, prev_vops);
});
break;
}
}