http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53353
Bug #: 53353
Summary: Missing error/warning when using __int128_t with
incorrect asm register constraints
Classification: Unclassified
Product: gcc
Version: 4.7.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
AssignedTo: unassig...@gcc.gnu.org
ReportedBy: svfue...@gmail.com
The following (nonsensical) code should give an error (or at least a warning)
about the 128 bit type not fitting into a register:
void foo(__int128_t x)
{
asm("mov %0, bar":: "r" (x));
}
Instead, the above compiles into an instruction that uses the 16 bit register
%ax.
(Compiled with -Wall -W)
