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fold-const.c (fold_single_bit_test): Fix overflow test.

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2013-08-30  Richard Biener  <rguenther@suse.de>

	* fold-const.c (fold_single_bit_test): Fix overflow test.

From-SVN: r202103
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Richard Biener 2013-08-30 11:52:15 +00:00 committed by Richard Biener
parent f7e088e7de
commit 26d7570303
2 changed files with 7 additions and 3 deletions
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gcc/ChangeLog
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@ -1,3 +1,7 @@
2013-08-30 Richard Biener <rguenther@suse.de>
* fold-const.c (fold_single_bit_test): Fix overflow test.
2013-08-30 Eric Botcazou <ebotcazou@adacore.com>
* function.c (assign_parm_setup_reg): For a parameter passed by pointer

6
gcc/fold-const.c
View File

@ -6634,10 +6634,10 @@ fold_single_bit_test (location_t loc, enum tree_code code,
not overflow, adjust BITNUM and INNER. */
if (TREE_CODE (inner) == RSHIFT_EXPR
&& TREE_CODE (TREE_OPERAND (inner, 1)) == INTEGER_CST
&& TREE_INT_CST_HIGH (TREE_OPERAND (inner, 1)) == 0
&& host_integerp (TREE_OPERAND (inner, 1), 1)
&& bitnum < TYPE_PRECISION (type)
&& 0 > compare_tree_int (TREE_OPERAND (inner, 1),
bitnum - TYPE_PRECISION (type)))
&& (TREE_INT_CST_LOW (TREE_OPERAND (inner, 1))
< (unsigned) (TYPE_PRECISION (type) - bitnum)))
{
bitnum += TREE_INT_CST_LOW (TREE_OPERAND (inner, 1));
inner = TREE_OPERAND (inner, 0);