------- Comment #4 from bonzini at gnu dot org 2006-02-06 14:06 -------
More precisely, combine is attempting to do instruction selection, and in the
case of this bug it cannot.
A similar ARM test case is
int f (int a, int b)
{
int s = a - b;
int t = a < b ? a : s;
x = s;
y = t;
}
which should be something like (pseudo-assembly)
rsbs s, b, a
str [x], s
movlt s, a
str [y], t
it is possible to teach the combiner about this reduced testcase, but it won't
match in the full testcase from which this was extracted, because s is used
between its definition and the definition of t.
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=16798
