[Bug rtl-optimization/24810] [4.1/4.2 Regression] mov + mov + testl generated instead of testb

[jakub at gcc dot gnu dot org]

------- Comment #8 from jakub at gcc dot gnu dot org  2005-12-29 11:53 -------
I don't think this is a bug, in fact, not honoring the volatile in GCC 4.0.x
and earlier was a bug.  If you want to allow byte access rather than word
access, you really need to remove the volatile keyword and then it compiles
into
restore_fpu:
        testb   $1, boot_cpu_data+15
        je      .L2
        jmp     foo
.L2:
        jmp     bar
        .size   restore_fpu, .-restore_fpu
        .ident  "GCC: (GNU) 4.2.0 20051223 (experimental)"

You should report this against Linux kernel, it shouldn't use volatile in
there.


-- 

jakub at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |RESOLVED
         Resolution|                            |INVALID


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=24810