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tree-dfa.c (set_ssa_default_def): Clear the SSA_NAME_DEFAULT_DEF bit of the old name when we clear the slot. 

2012-08-07  Richard Guenther  <rguenther@suse.de>

	* tree-dfa.c (set_ssa_default_def): Clear the SSA_NAME_DEFAULT_DEF
	bit of the old name when we clear the slot.
	* tree-ssa-live.c (remove_unused_locals): Release any default
	def associated with an unused var.
	* tree-ssa-copy.c (may_propagate_copy_into_asm): Always return true.

From-SVN: r190201
This commit is contained in:
Richard Guenther 2012-08-07 14:16:11 +00:00 committed by Richard Biener
parent 5f33a4fc3e
commit 01c59d23df
4 changed files with 22 additions and 7 deletions
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8
gcc/ChangeLog
View File

@ -1,3 +1,11 @@
2012-08-07 Richard Guenther <rguenther@suse.de>
* tree-dfa.c (set_ssa_default_def): Clear the SSA_NAME_DEFAULT_DEF
bit of the old name when we clear the slot.
* tree-ssa-live.c (remove_unused_locals): Release any default
def associated with an unused var.
* tree-ssa-copy.c (may_propagate_copy_into_asm): Always return true.
2012-08-07 Richard Guenther <rguenther@suse.de>
* tree-into-ssa.c (rewrite_stmt): Remove clobbers for variables

7
gcc/tree-dfa.c
View File

@ -336,7 +336,10 @@ set_ssa_default_def (struct function *fn, tree var, tree def)
loc = htab_find_slot_with_hash (DEFAULT_DEFS (fn), &in,
DECL_UID (var), NO_INSERT);
if (*loc)
htab_clear_slot (DEFAULT_DEFS (fn), loc);
{
SSA_NAME_IS_DEFAULT_DEF (*(tree *)loc) = false;
htab_clear_slot (DEFAULT_DEFS (fn), loc);
}
return;
}
gcc_assert (TREE_CODE (def) == SSA_NAME && SSA_NAME_VAR (def) == var);
@ -349,7 +352,7 @@ set_ssa_default_def (struct function *fn, tree var, tree def)
/* Mark DEF as the default definition for VAR. */
*(tree *) loc = def;
SSA_NAME_IS_DEFAULT_DEF (def) = true;
SSA_NAME_IS_DEFAULT_DEF (def) = true;
}
/* Retrieve or create a default definition for VAR. */

7
gcc/tree-ssa-copy.c
View File

@ -137,12 +137,9 @@ may_propagate_copy_into_stmt (gimple dest, tree orig)
/* Similarly, but we know that we're propagating into an ASM_EXPR. */
bool
may_propagate_copy_into_asm (tree dest)
may_propagate_copy_into_asm (tree dest ATTRIBUTE_UNUSED)
{
/* Hard register operands of asms are special. Do not bypass. */
return !(TREE_CODE (dest) == SSA_NAME
&& TREE_CODE (SSA_NAME_VAR (dest)) == VAR_DECL
&& DECL_HARD_REGISTER (SSA_NAME_VAR (dest)));
return true;
}

7
gcc/tree-ssa-live.c
View File

@ -798,9 +798,16 @@ remove_unused_locals (void)
{
if (!is_used_p (var))
{
tree def;
if (cfun->nonlocal_goto_save_area
&& TREE_OPERAND (cfun->nonlocal_goto_save_area, 0) == var)
cfun->nonlocal_goto_save_area = NULL;
/* Release any default def associated with var. */
if ((def = ssa_default_def (cfun, var)) != NULL_TREE)
{
set_ssa_default_def (cfun, var, NULL_TREE);
release_ssa_name (def);
}
continue;
}
}