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re PR tree-optimization/44030 (error: SSA name in freelist but still referenced) 

2010-05-08  Richard Guenther  <rguenther@suse.de>

	PR tree-optimization/44030
	* tree-ssa-pre.c (eliminate): Copy NECESSARY flag.  Set
	NECESSARY flag if we propagate from a inserted expression.

	* gcc.c-torture/compile/pr44030.c: New testcase.

From-SVN: r159186
This commit is contained in:
Richard Guenther 2010-05-08 13:12:56 +00:00 committed by Richard Biener
parent f56000ede5
commit 43896afb8b
4 changed files with 44 additions and 1 deletions
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6
gcc/ChangeLog
View File

@ -1,3 +1,9 @@
2010-05-08 Richard Guenther <rguenther@suse.de>
PR tree-optimization/44030
* tree-ssa-pre.c (eliminate): Copy NECESSARY flag. Set
NECESSARY flag if we propagate from a inserted expression.
2010-05-08 Eric Botcazou <ebotcazou@adacore.com>
* gimple.c (gimple_types_compatible_p) <ARRAY_TYPE>: Treat bounds of

5
gcc/testsuite/ChangeLog
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@ -1,3 +1,8 @@
2010-05-08 Richard Guenther <rguenther@suse.de>
PR tree-optimization/44030
* gcc.c-torture/compile/pr44030.c: New testcase.
2010-05-08 Eric Botcazou <ebotcazou@adacore.com>
* gnat.dg/lto6.adb: New test.

28
gcc/testsuite/gcc.c-torture/compile/pr44030.c Normal file
View File

@ -0,0 +1,28 @@
typedef int int32_t;
typedef unsigned int uint32_t;
static uint32_t
safe_sub_func_uint32_t_u_u (uint32_t ui1, uint32_t ui2)
{
return ui1 - ui2;
}
int32_t l_105[7];
int32_t g_4;
int32_t *g_54 = &g_4;
int32_t *
func (int32_t p_73, int32_t * p_74, int32_t p_75, int32_t * *p_76,
int32_t * *p_77)
{
lbl_110:for (g_4 = 0; g_4; g_4 = 1)
{
}
for (p_75 = -28; p_75; p_75 = safe_sub_func_uint32_t_u_u (p_75, 1))
{
if (g_4)
goto lbl_110;
*g_54 = 0;
}
return &l_105[5];
}

6
gcc/tree-ssa-pre.c
View File

@ -4351,6 +4351,7 @@ eliminate (void)
sprime = fold_convert (TREE_TYPE (res), sprime);
stmt = gimple_build_assign (res, sprime);
SSA_NAME_DEF_STMT (res) = stmt;
gimple_set_plf (stmt, NECESSARY, gimple_plf (phi, NECESSARY));
gsi2 = gsi_after_labels (b);
gsi_insert_before (&gsi2, stmt, GSI_NEW_STMT);
@ -4381,8 +4382,11 @@ eliminate (void)
&& single_imm_use (lhs, &use_p, &use_stmt)
&& may_propagate_copy (USE_FROM_PTR (use_p), rhs))
{
SET_USE (use_p, gimple_assign_rhs1 (stmt));
SET_USE (use_p, rhs);
update_stmt (use_stmt);
if (bitmap_bit_p (inserted_exprs, SSA_NAME_VERSION (lhs))
&& TREE_CODE (rhs) == SSA_NAME)
gimple_set_plf (SSA_NAME_DEF_STMT (rhs), NECESSARY, true);
}
/* If this is a store or a now unused copy, remove it. */