diff options
Diffstat (limited to 'gcc/regclass.c')
| -rw-r--r-- | gcc/regclass.c | 13 |
1 files changed, 12 insertions, 1 deletions
diff --git a/gcc/regclass.c b/gcc/regclass.c index 9faf8ab..57be118 100644 --- a/gcc/regclass.c +++ b/gcc/regclass.c @@ -1268,6 +1268,12 @@ record_reg_classes (n_alts, n_ops, ops, modes, constraints, insn) case 'p': allows_addr = 1; win = address_operand (op, GET_MODE (op)); + /* We know this operand is an address, so we want it to be + allocated to a register that can be the base of an + address, ie BASE_REG_CLASS. */ + classes[i] + = reg_class_subunion[(int) classes[i]] + [(int) BASE_REG_CLASS]; break; case 'm': case 'o': case 'V': @@ -1399,7 +1405,12 @@ record_reg_classes (n_alts, n_ops, ops, modes, constraints, insn) { if (classes[i] == NO_REGS) { - if (! allows_addr) + /* We must always fail if the operand is a REG, but + we did not find a suitable class. + + Otherwise we may perform an uninitialized read + from this_op_costs after the `continue' statement + below. */ alt_fail = 1; } else |