https://bugs.freedesktop.org/show_bug.cgi?id=39631
--- Comment #6 from Stephan Bergmann <sberg...@redhat.com> ---
also note that GCC __builtin_expect (with its first parameter being of type
long) is plain, simple, and generally does not work as one would naively hope:
> class C {
> private:
> struct S;
> typedef void (S::* B)();
> public:
> operator B();
> };
> int f(C c) {
> if (c) {
> if (__builtin_expect(c, 1)) {
> return 1;
> } else {
> return 2;
> }
> } else {
> return 3;
> }
> }
will cause a compilation error "cannot convert ‘C’ to ‘long int’ for argument
‘1’ to ‘long int __builtin_expect(long int, long int)’"
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