On Fri, Jun 24, 2011 at 7:17 AM, H.J. Lu <hjl.to...@gmail.com> wrote: > On Fri, Jun 24, 2011 at 7:07 AM, Eric Botcazou <ebotca...@adacore.com> wrote: >>> I compared x32 glibc built with the old x32 gcc against x32 glibc built >>> with this patch and >>> >>> http://gcc.gnu.org/ml/gcc-patches/2011-06/msg00913.html >>> >>> reverted, the new glibc is little smaller: >>> >>> New: >>> >>> [hjl@gnu-33 build-x86_64-linux]$ size libc.so >>> text data bss dec hex filename >>> 1537648 10076 12944 1560668 17d05c libc.so >>> [hjl@gnu-33 build-x86_64-linux]$ >>> >>> Old: >>> >>> [hjl@gnu-33 build-x86_64-linux.old]$ size libc.so >>> text data bss dec hex filename >>> 1538968 10076 12944 1561988 17d584 libc.so >>> [hjl@gnu-33 build-x86_64-linux.old]$ >>> >>> I looked at assembly codes. The new one is better. >>> I will check it in. >> >> OK, but remove the equivalent code in num_sign_bit_copies1 then, otherwise >> someone in a couple of years from now will adapt it to nonzero_bits1 and we >> will be back to square one. >> > > I am testing this patch on x32 branch. I will compare glibc binaries before > and > after. >
There are no code differences in glibc. I will check it in. Thanks. H.J. > -- > H.J. > --- > diff --git a/gcc/rtlanal.c b/gcc/rtlanal.c > index e5c045d..0be6504 100644 > --- a/gcc/rtlanal.c > +++ b/gcc/rtlanal.c > @@ -4605,21 +4605,6 @@ num_sign_bit_copies1 (const_rtx x, enum > machine_mode mode, const_rtx known_x, > known_x, known_mode, known_ret); > result = MAX (1, MIN (num0, num1) - 1); > > -#ifdef POINTERS_EXTEND_UNSIGNED > - /* If pointers extend signed and this is an addition or subtraction > - to a pointer in Pmode, all the bits above ptr_mode are known to be > - sign bit copies. */ > - /* As we do not know which address space the pointer is refering to, > - we can do this only if the target does not support different pointer > - or address modes depending on the address space. */ > - if (target_default_pointer_address_modes_p () > - && ! POINTERS_EXTEND_UNSIGNED && GET_MODE (x) == Pmode > - && (code == PLUS || code == MINUS) > - && REG_P (XEXP (x, 0)) && REG_POINTER (XEXP (x, 0))) > - result = MAX ((int) (GET_MODE_BITSIZE (Pmode) > - - GET_MODE_BITSIZE (ptr_mode) + 1), > - result); > -#endif > return result; > > case MULT: > -- H.J.
