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Fix multiple_of_p behavior with NOP_EXPR

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We were passing down the original type to recursive invocations
of multiple_of_p for say (int)(unsigned * unsigned).

2022-01-24  Richard Biener  <rguenther@suse.de>

	PR tree-optimization/100499
	* fold-const.cc (multiple_of_p): Pass the correct type of
	the expression to the recursive invocation of multiple_of_p
	for conversions and use CASE_CONVERT.
This commit is contained in:
Richard Biener 2022-01-24 14:59:00 +01:00
parent 23987912dd
commit 625f16c798
1 changed files with 3 additions and 3 deletions
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6
gcc/fold-const.cc
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@ -14149,14 +14149,14 @@ multiple_of_p (tree type, const_tree top, const_tree bottom)
}
return 0;
case NOP_EXPR:
CASE_CONVERT:
/* Can't handle conversions from non-integral or wider integral type. */
if ((TREE_CODE (TREE_TYPE (TREE_OPERAND (top, 0))) != INTEGER_TYPE)
|| (TYPE_PRECISION (type)
< TYPE_PRECISION (TREE_TYPE (TREE_OPERAND (top, 0)))))
return 0;
/* fall through */
return multiple_of_p (TREE_TYPE (TREE_OPERAND (top, 0)),
TREE_OPERAND (top, 0), bottom);
case SAVE_EXPR:
return multiple_of_p (type, TREE_OPERAND (top, 0), bottom);