[Bug c++/45221] missed optimization on casting pointers even under -O3

[navin dot kumar at gmail dot com]

------- Comment #1 from navin dot kumar at gmail dot com  2010-08-07 01:29 
-------
The assembly generated for foo1 & foo2 (under -O3) are identical:
    leaq    -4(%rdi), %rdx
    xorl    %eax, %eax
    testq   %rdi, %rdi
    cmovne  %rdx, %rax
    movl    8(%rax), %eax
    ret

The assembly generated for foo3 is the most optimal:
    movl    4(%rdi), %eax
    ret


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45221