OpenE2K
/
gcc
2
0
Fork 0
Code Issues Pull Requests Projects Releases Wiki Activity

(left_shift): Ignore integer overflow. 

From-SVN: r9915
This commit is contained in:
Richard Kenner 1995-06-09 18:01:39 -04:00
parent 245391da4e
commit 138c94ea17
1 changed files with 5 additions and 11 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

16
gcc/cexp.y
View File

@ -898,21 +898,15 @@ left_shift (a, b)
struct constant *a;
unsigned long b;
{
/* It's unclear from the C standard whether shifts can overflow.
The following code ignores overflow; perhaps a C standard
interpretation ruling is needed. */
if (b >= HOST_BITS_PER_LONG)
{
if (! a->unsignedp && a->value != 0)
integer_overflow ();
return 0;
}
return 0;
else if (a->unsignedp)
return (unsigned long) a->value << b;
else
{
long l = a->value << b;
if (l >> b != a->value)
integer_overflow ();
return l;
}
return a->value << b;
}
static long