[Bug tree-optimization/21748] New: gcc doesn't compile my c code (with some inline asm ocde) if compiling with optimization options

[Bug tree-optimization/21748] New: gcc doesn't compile my c code (with some inline asm ocde) if compiling with optimization options

[sunmoon1997 at gmail dot com]

#include <stdlib.h>

#define mmx_m2r(op, mem, reg) \
                __asm__ __volatile__ (#op "\t%0, %%" #reg \
                                : /* nothing */ \
                                : "X" (mem))
#define movd_m2r(var, reg)      mmx_m2r(movd, var, reg)

int main () {
        int a;
        int c;
        int b;
        int d;

        b = 100;
        c = rand () % 256;
        a = 256 - c;
        d = (a / 4) + 1;
        movd_m2r(b, mm4);
        movd_m2r(c, mm5);
        movd_m2r(a, mm6);
        movd_m2r(d, mm7);

        return 0;
}

gcc-4.0.0 desn't compile the above code if compile with option -O[s1-9], and
i got following output.
smspc tmp # gcc -Wall -S -o - testmmx.c -O
        .file   "testmmx.c"
        .text
.globl main
        .type   main, @function
main:
        pushl   %ebp
        movl    %esp, %ebp
        subl    $8, %esp
        andl    $-16, %esp
        subl    $16, %esp
        call    rand
        cltd
        shrl    $24, %edx
        addl    %edx, %eax
        andl    $255, %eax
        subl    %edx, %eax
        movl    %eax, %ecx
        movl    $256, %edx
        subl    %eax, %edx
#APP
        movd    $100, %mm4
        movd    %ecx, %mm5
        movd    %edx, %mm6
testmmx.c: In function 'main':
testmmx.c:22: error: invalid 'asm': invalid expression as operand
        movd    +1, %mm7
#NO_APP
        movl    $0, %eax
        leave
        ret
        .size   main, .-main
        .ident  "GCC: (GNU) 4.0.0-20050522 (Gentoo 4.0.0.20050522)"
        .section        .note.GNU-stack,"",@progbits 

compiling without -O is ok.
smspc tmp # gcc -Wall -S -o - testmmx.c
        .file   "testmmx.c"
        .text
.globl main
        .type   main, @function
main:
        pushl   %ebp
        movl    %esp, %ebp
        subl    $24, %esp
        andl    $-16, %esp
        movl    $0, %eax
        addl    $15, %eax
        addl    $15, %eax
        shrl    $4, %eax
        sall    $4, %eax
        subl    %eax, %esp
        movl    $100, -8(%ebp)
        call    rand
        movl    %eax, %edx
        movl    %edx, %eax
        sarl    $31, %eax
        movl    %eax, %ecx
        shrl    $24, %ecx
        leal    (%edx,%ecx), %eax
        andl    $255, %eax
        subl    %ecx, %eax
        movl    %eax, -12(%ebp)
        movl    $256, %eax
        subl    -12(%ebp), %eax
        movl    %eax, -16(%ebp)
        movl    -16(%ebp), %edx
        movl    %edx, %eax
        sarl    $31, %eax
        shrl    $30, %eax
        addl    %edx, %eax
        sarl    $2, %eax
        incl    %eax
        movl    %eax, -4(%ebp)
#APP
        movd    -8(%ebp), %mm4
        movd    -12(%ebp), %mm5
        movd    -16(%ebp), %mm6
        movd    -4(%ebp), %mm7
#NO_APP
        movl    $0, %eax
        leave
        ret
        .size   main, .-main
        .ident  "GCC: (GNU) 4.0.0-20050522 (Gentoo 4.0.0.20050522)"
        .section        .note.GNU-stack,"",@progbits 

some additional info about my system:
Portage 2.0.51.22-r1 (default-linux/x86/2005.0, gcc-4.0.0-20050522,
glibc-2.3.5.20050418-r0, 2.6.12-rc4-skunk1-unicon i686)
=================================================================
System uname: 2.6.12-rc4-skunk1-unicon i686 Intel(R) Celeron(R) CPU 1.70GHz
Gentoo Base System version 1.6.12
dev-lang/python:     2.3.5
sys-apps/sandbox:    1.2.8
sys-devel/autoconf:  2.13, 2.59-r6
sys-devel/automake:  1.4_p6, 1.5, 1.6.3, 1.7.9-r1, 1.8.5-r3, 1.9.5
sys-devel/binutils:  2.15.97
sys-devel/libtool:   1.5.16
virtual/os-headers:  2.6.11
ACCEPT_KEYWORDS="x86 ~x86"
AUTOCLEAN="yes"
CBUILD="i686-pc-linux-gnu"
CFLAGS="-O1 -pipe -march=pentium4"
CHOST="i686-pc-linux-gnu"

-- 
           Summary: gcc doesn't compile my c code (with some inline asm
                    ocde) if compiling with optimization options
           Product: gcc
           Version: 4.0.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: tree-optimization
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: sunmoon1997 at gmail dot com
                CC: gcc-bugs at gcc dot gnu dot org
 GCC build triplet: i686-pc-linux-gnu
  GCC host triplet: i686-pc-linux-gnu
GCC target triplet: i686-pc-linux-gnu


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=21748

[Bug tree-optimization/21748] gcc doesn't compile my c code (with some inline asm ocde) if compiling with optimization options

[pinskia at gcc dot gnu dot org]

------- Additional Comments From pinskia at gcc dot gnu dot org  2005-05-25 12:14 -------
X should almost never used.  if you are using inline-asm for mmx instruction, please use the mmx 
intrinsics instead which are better optimized.

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


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=21748

[Bug tree-optimization/21748] gcc doesn't compile my c code (with some inline asm ocde) if compiling with optimization options

[sunmoon1997 at gmail dot com]

------- Additional Comments From sunmoon1997 at gmail dot com  2005-05-25 12:52 -------
thanks for replay

-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=21748