[Bug middle-end/24929] long long shift/mask operations should be better optimized

[ian at airs dot com]

------- Comment #4 from ian at airs dot com  2006-06-27 06:05 -------
With my current version of the lower-subreg patch, I get this with -O2
-momit-leaf-frame-pointer:

f:
        movl    16(%esp), %eax
        movl    4(%esp), %ecx
        movl    8(%esp), %edx
        shrl    $16, %eax
        andl    $255, %eax
        shldl   $8, %ecx, %edx
        sall    $8, %ecx
        orl     %ecx, %eax
        ret

which may be optimal.


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=24929