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| author | jsm28 <jsm28@138bc75d-0d04-0410-961f-82ee72b054a4> | 2011-10-12 11:56:03 +0000 |
|---|---|---|
| committer | jsm28 <jsm28@138bc75d-0d04-0410-961f-82ee72b054a4> | 2011-10-12 11:56:03 +0000 |
| commit | 2ae38d08e484fd562fa006bb63dd12eb6f2cb2e4 (patch) | |
| tree | f9da918ccf98c870d0761a3947118511d0015444 /gcc/convert.c | |
| parent | 146c1712b4430dfc4f453201d1edd9351b34edb1 (diff) | |
| download | gcc-2ae38d08e484fd562fa006bb63dd12eb6f2cb2e4.tar.gz | |
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.
git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@179845 138bc75d-0d04-0410-961f-82ee72b054a4
Diffstat (limited to 'gcc/convert.c')
| -rw-r--r-- | gcc/convert.c | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/gcc/convert.c b/gcc/convert.c index a647193ca94..f04b2048194 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)) |