The following code should generate outb, outw and outl statements.
gcc-3.4.6 produces an ICE:
foo.cc: In function `void out(unsigned int, T) [with T = unsigned char]':
foo.cc:14: instantiated from here
foo.cc:5: internal compiler error: in print_operand, at config/i386/i386.c:7375
gcc-4.1.2 produces an ICE:
foo.cc: In function 'void out(unsigned int, T) [with T = unsigned char]':
foo.cc:5: internal compiler error: in print_operand, at config/i386/i386.c:7226
gcc-4.3.0 generates wrong code (outs instead of outw) for T=unsigned short
foo.cc: Assembler messages:
foo.cc:5: Error: suffix or operands invalid for `outs'
Code snippet:
template <typename T>
static inline void
out (unsigned port, T val)
{
asm volatile ("out%z0 %0, %w1" : : "a" (val), "Nd" (port));
}
int main()
{
unsigned char a;
unsigned short b;
unsigned long c;
out (0x80, a);
out (0x80, b);
out (0x80, c);
}
--
Summary: Invalid code or ICE for %z constraint
Product: gcc
Version: 4.3.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: inline-asm
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: us15 at os dot inf dot tu-dresden dot de
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=31768
