[Bug c/40757] gcc 4.4.0 miscompiles mpfr-2.4.1

["david dot kirkby at onetel dot net" <gcc-bugzilla at gcc dot gnu dot org>]

------- Comment #13 from david dot kirkby at onetel dot net  2009-07-16 21:29 -------
(In reply to comment #11)
> You haven't mentioned what options you compiled this file with.  So, assuming
> -O2, I see:
>         add     %i4, -1, %l5    ! n,, tmp186
>         sethi   %hi(1073740800), %o2    !, tmp189
>         sll     %l5, 2, %l5     ! tmp186,, D.4491
>         or      %o2, 1023, %o2  ! tmp189,, tmp188
>         st      %g1, [%i0+%l5]  !,* D.4491
>         add     %i4, %o2, %o2   ! n, tmp188, tmp187
>         mov     %i0, %o0        ! a,
>         sll     %o2, 2, %o2     ! tmp187,,
>         call    memset, 0       !,
>          mov    0, %o1  !,
> for this memset call, which looks correct to me.  The st %g1, [%i0+%l5] line
> stores to %i0 a[n-1] and memset is called with memset (a, 0, (n + 0x3fffffffU)
> << 2);  So, if this doesn't work (and you see the same), you hit a bug in
> Solaris memset implementation, which doesn't handle properly length with
> garbage in upper 32-bits, guess it could use brz,pn %o2, do_nothing or
> something similar, which is fine for 64-bit code, but certainly not for 32-bit
> code.
> 

I should add we are using the Sun assembler and linker, not the GNU ones. I
don't know whether that would effect the output. If so, can you tell me how to
generate the assembler code? Or as I say, you can have an account. 


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=40757