[lkml]   [2003]   [Mar]   [11]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
    SubjectRe: Runaway cron task on 2.5.63/4 bk?
    Linus Torvalds <> wrote:
    > On Tue, 11 Mar 2003, Andrew Morton wrote:
    > >
    > > 2.95.3 and 3.2.1 seem to do it right?
    > Try the "64x32->64" version. gcc didn't use to get that one right, but
    > maybe it does now.

    long a;
    long long b;
    long long c;

    void foo(void)
    c = a * b;

    It seems to get that wrong. At least, there are three multiplies in there.
    3.2.1 is similar.

    .file "t.c"
    .version "01.01"
    .align 4
    .globl foo
    .type foo,@function
    pushl %ebp
    movl %esp,%ebp
    subl $16,%esp
    pushl %esi
    pushl %ebx
    movl a,%eax
    movl %eax,%ebx
    movl %eax,%esi
    sarl $31,%esi
    movl %ebx,%eax
    mull b
    movl %eax,-8(%ebp)
    movl %edx,-4(%ebp)
    movl %ebx,%eax
    imull b+4,%eax
    addl %eax,%edx
    movl %edx,-4(%ebp)
    movl b,%eax
    imull %esi,%eax
    addl %eax,-4(%ebp)
    movl -8(%ebp),%eax
    movl -4(%ebp),%edx
    movl %eax,c
    movl %edx,c+4
    popl %ebx
    popl %esi
    movl %ebp,%esp
    popl %ebp
    .size foo,.Lfe1-foo
    .comm a,4,4
    .comm b,8,4
    .comm c,8,4
    .ident "GCC: (GNU) 2.95.3 20010315 (release)"

    To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
    the body of a message to
    More majordomo info at
    Please read the FAQ at

     \ /
      Last update: 2005-03-22 13:33    [W:0.023 / U:10.516 seconds]
    ©2003-2016 Jasper Spaans. hosted at Digital OceanAdvertise on this site