On Mon, 20 Nov 2017, Marc Glisse wrote:
new version, regtested on powerpc64le-unknown-linux-gnu. The front-end parts are up for review.

2017-10-28  Marc Glisse  <marc.gli...@inria.fr>

gcc/c/
        * c-fold.c (c_fully_fold_internal): Handle POINTER_DIFF_EXPR.
        * c-typeck.c (pointer_diff): Use POINTER_DIFF_EXPR.

gcc/c-family/
        * c-pretty-print.c (pp_c_additive_expression,
        c_pretty_printer::expression): Handle POINTER_DIFF_EXPR.

gcc/cp/
        * constexpr.c (cxx_eval_constant_expression,
        potential_constant_expression_1): Handle POINTER_DIFF_EXPR.
        * cp-gimplify.c (cp_fold): Likewise.
        * error.c (dump_expr): Likewise.
        * typeck.c (pointer_diff): Use POINTER_DIFF_EXPR.

I'm afraid this broke building Wine.

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83164


ddeml.c: In function ‘DDEML_AddThunk’:
ddeml.c:181:28: error: type mismatch in pointer diff expression
static struct ddeml_thunk*      DDEML_AddThunk(DWORD instId, DWORD pfn16)
                           ^~~~~~~~~~~~~~
int

struct HDDEDATA__ * (*<T1c96>) (DWORD, UINT, UINT, struct HCONV__ *, struct HSZ__ *, struct HSZ__ *, struct HDDEDATA__ *, ULONG_PTR, ULONG_PTR)

DWORD *

_6 = WDML_InvokeCallback16 - _5;
ddeml.c:181:28: internal compiler error: verify_gimple failed


David, in addition to the ICE diagnostics also looks, umm, rather confusing?

Gerald

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