https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84742
--- Comment #4 from Vegard Nossum <vegard.nossum at gmail dot com> ---
So I think the problem is that this loop in lra_set_insn_recog_data() counts
the number of commas and uses that as the number of alternatives:
1018 for (p = constraints[0]; *p; p++)
1019 nalt += *p == ',';
And then later we can skip over the comma inside preprocess_constraints()
because 'T' is not recognised in the switch and then it does:
p += CONSTRAINT_LEN (c, p);
where CONSTRAINT_LEN for 'T' is 2:
static inline size_t
insn_constraint_len (char fc, const char *str ATTRIBUTE_UNUSED)
{
switch (fc)
{
case 'B': return 2;
case 'T': return 2;
case 'W': return 2;
case 'Y': return 2;
default: break;
}
return 1;
}
(so the real problematic bit of the constraint is this: "T,")
