From a2d5091a51e15ef05478b68013ca3df36010a7a2 Mon Sep 17 00:00:00 2001 From: Joseph Myers Date: Wed, 12 Oct 2011 12:56:03 +0100 Subject: re PR c/50565 (initializer element is not computable at load time) PR c/50565 * convert.c (convert_to_integer): Do not narrow operands of pointer subtraction. testsuite: * gcc.c-torture/compile/pr50565-1.c, gcc.c-torture/compile/pr50565-2.c: New tests. From-SVN: r179845 --- gcc/convert.c | 9 +++++++++ 1 file changed, 9 insertions(+) (limited to 'gcc/convert.c') diff --git a/gcc/convert.c b/gcc/convert.c index a647193..f04b204 100644 --- a/gcc/convert.c +++ b/gcc/convert.c @@ -745,6 +745,15 @@ 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)) -- cgit v1.1