[Bug inline-asm/29808] New: [4.2 Regression] Error: suffix or operands invalid for `mov' when optimization is enabled

["bero at arklinux dot org" <gcc-bugzilla at gcc dot gnu dot org>]

The following code (extracted from the Linux kernel) fails to compile with
optimization enabled:

static void load_fs(unsigned short sel)
{
        asm("mov %0, %%fs" : : "g"(sel));
}

int main(int argc, char **argv)
{
        load_fs(0);
}


[bero@dhcppc1 arklinux]$ gcc test.c
[bero@dhcppc1 arklinux]$ gcc -O1 test.c
/tmp/ccSpA5Rm.s: Assembler messages:
/tmp/ccSpA5Rm.s:13: Error: suffix or operands invalid for `mov'

gcc is 4.2 SVN revision 118519 (20061106).


-- 
           Summary: [4.2 Regression] Error: suffix or operands invalid for
                    `mov' when optimization is enabled
           Product: gcc
           Version: 4.2.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: inline-asm
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: bero at arklinux dot org
 GCC build triplet: i586-pc-linux-gnu
  GCC host triplet: i586-pc-linux-gnu
GCC target triplet: i586-pc-linux-gnu


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=29808