https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71246
Bug ID: 71246
Summary: "+g" assembly constraint causes error: inconsistent
operand constraints in an 'asm'
Product: gcc
Version: 6.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: inline-asm
Assignee: unassigned at gcc dot gnu.org
Reporter: eric at efcs dot ca
Target Milestone: ---
The following code fails to compile with the error "inconsistent operand
constraints in an 'asm'". It seems to also be triggered when the constrain is
stated as "+rm" which makes more sense.
Previous versions of GCC ICE'd on this code.
template <class Tp>
inline __attribute__((__always_inline__))
void DoNotOptimize(Tp const& value) {
asm volatile("" : "+g" (const_cast<Tp&>(value)));
}
struct Foo {
int Arr[42];
};
void test2() {
Foo f = {};
DoNotOptimize(f);
}
There are a couple of similar bugs but I'm not certain they are duplicates so
I'm filing this separately.
