Re: CVS commit: src/sys/kern

[Andrew Doran <ad%netbsd.org@localhost>]

On Fri, Apr 17, 2009 at 12:10:57AM +0000, YAMAMOTO Takashi wrote:

> > Module Name:        src
> > Committed By:       ad
> > Date:               Thu Apr 16 21:19:24 UTC 2009
> > 
> > Modified Files:
> >     src/sys/kern: kern_synch.c
> > 
> > Log Message:
> > kpreempt: fix another bug, uintptr_t -> bool truncation.
> 
> truncation?
> iirc, (_Bool)foo means foo != 0.

It appears you are right:

$ cat test2.c
#include <stdbool.h>

long    value;

bool
truncate()
{

  return value;
}
$ cc -S test2.c
$ cat test2.s
        .file   "test2.c"
        .text
.globl truncate
        .type   truncate, @function
truncate:
        pushl   %ebp
        movl    %esp, %ebp
        movl    value, %eax
        testl   %eax, %eax
        setne   %al
        popl    %ebp
        ret
        .size   truncate, .-truncate
        .comm   value,4,4
        .ident  "GCC: (Ubuntu 4.3.2-1ubuntu12) 4.3.2"
        .section        .note.GNU-stack,"",@progbits