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Diffstat (limited to 'gcc-4.6/gcc/convert.c')
| -rw-r--r-- | gcc-4.6/gcc/convert.c | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/gcc-4.6/gcc/convert.c b/gcc-4.6/gcc/convert.c index 459d5337e..21d09c157 100644 --- a/gcc-4.6/gcc/convert.c +++ b/gcc-4.6/gcc/convert.c @@ -727,6 +727,15 @@ convert_to_integer (tree type, tree expr) tree arg0 = get_unwidened (TREE_OPERAND (expr, 0), type); tree arg1 = get_unwidened (TREE_OPERAND (expr, 1), type); + /* Do not try to narrow operands of pointer subtraction; + that will interfere with other folding. */ + if (ex_form == MINUS_EXPR + && CONVERT_EXPR_P (arg0) + && CONVERT_EXPR_P (arg1) + && POINTER_TYPE_P (TREE_TYPE (TREE_OPERAND (arg0, 0))) + && POINTER_TYPE_P (TREE_TYPE (TREE_OPERAND (arg1, 0)))) + break; + if (outprec >= BITS_PER_WORD || TRULY_NOOP_TRUNCATION (outprec, inprec) || inprec > TYPE_PRECISION (TREE_TYPE (arg0)) |