[Bug rtl-optimization/53176] [4.8 Regression] gcc.target/i386/movbe-2.c and gcc.dg/lower-subreg-1.c

[ubizjak at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53176

--- Comment #15 from Uros Bizjak <ubizjak at gmail dot com> 2012-05-03 16:19:04 
UTC ---
32bit x86 regressed (-O2 -mmovbe) with following testcase:

void
foo (long long i)
{
  x = __builtin_bswap64 (i);
}

from:

foo:
        movbe   4(%esp), %eax
        movbe   8(%esp), %edx
        movl    %eax, x+4
        movl    %edx, x
        ret

to:

foo:
        pushl   %ebx
        movl    8(%esp), %eax
        movl    12(%esp), %edx
        movl    %eax, %ebx
        movl    %edx, %ecx
        bswap   %ebx
        bswap   %ecx
        movl    %ebx, x+4
        movl    %ecx, x
        popl    %ebx