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| author | Jeffrey A Law <law@cygnus.com> | 1999-02-24 13:17:04 +0000 |
|---|---|---|
| committer | Jeff Law <law@gcc.gnu.org> | 1999-02-24 06:17:04 -0700 |
| commit | 46f40127a279a44341defa54a2410d7a95738346 (patch) | |
| tree | 0c67dbf28427a3da25928be7bb0f90340b0645fa /gcc/regclass.c | |
| parent | c99f8c2a3e3a5a81f3bec3c1fd3a080343bd57d1 (diff) | |
| download | gcc-46f40127a279a44341defa54a2410d7a95738346.zip gcc-46f40127a279a44341defa54a2410d7a95738346.tar.gz gcc-46f40127a279a44341defa54a2410d7a95738346.tar.bz2 | |
regclass.c (record_reg_classes, case 'p'): Set classes appropriately.
* regclass.c (record_reg_classes, case 'p'): Set classes appropriately.
An alternative always fails if it needs a pseudo and no suitable
register class can be found.
Bootstrapped on solaris.
From-SVN: r25402
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 |