[Bug c/27007] Missed optimization of comparison with 'limited range'

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

------- Comment #9 from tkoenig at gcc dot gnu dot org  2008-12-06 10:51 -------
This is now fixed:

$ cat foo.c
int foo(unsigned char x)
{
  return (x+1) != 0;
}

$ gcc -O3 -fdump-tree-optimized -S foo.c
$ cat foo.s
        .file   "foo.c"
        .text
        .p2align 4,,15
.globl foo
        .type   foo, @function
foo:
        pushl   %ebp
        movl    $1, %eax
        movl    %esp, %ebp
        popl    %ebp
        ret
        .size   foo, .-foo
        .ident  "GCC: (GNU) 4.4.0 20081122 (experimental)"
        .section        .note.GNU-stack,"",@progbits
$ cat foo.c.123t.optimized

;; Function foo (foo)

Analyzing Edge Insertions.
foo (unsigned char x)
{
<bb 2>:
  return 1;

}

I'm not sure how to write a test case for this.

Should it just be closed?


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=27007