From 46f40127a279a44341defa54a2410d7a95738346 Mon Sep 17 00:00:00 2001 From: Jeffrey A Law Date: Wed, 24 Feb 1999 13:17:04 +0000 Subject: [PATCH] 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 --- gcc/ChangeLog | 6 ++++++ gcc/regclass.c | 13 ++++++++++++- 2 files changed, 18 insertions(+), 1 deletion(-) diff --git a/gcc/ChangeLog b/gcc/ChangeLog index ff439fd..057facc 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -1,3 +1,9 @@ +Wed Feb 24 14:03:54 1999 Jeffrey A Law (law@cygnus.com) + + * 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. + Wed Feb 24 19:47:56 1999 J"orn Rennecke * loop.h (loop_insn_first_p): Declare. 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 -- 2.7.4