/* If this is a sign-extended 32-bit constant, we can do this in at most
three insns, so do it if we have enough insns left. We always have
- a sign-extended 32-bit constant when compiling on a narrow machine.
- Note that we cannot handle the constant 0x80000000. */
+ a sign-extended 32-bit constant when compiling on a narrow machine. */
- if ((HOST_BITS_PER_WIDE_INT != 64
- || c >> 31 == -1 || c >> 31 == 0)
- && c != 0x80000000U)
+ if (HOST_BITS_PER_WIDE_INT != 64
+ || c >> 31 == -1 || c >> 31 == 0)
{
HOST_WIDE_INT low = (c & 0xffff) - 2 * (c & 0x8000);
HOST_WIDE_INT tmp1 = c - low;
}
if (c == low || (low == 0 && extra == 0))
- return copy_to_suggested_reg (GEN_INT (c), target, mode);
+ {
+ /* We used to use copy_to_suggested_reg (GEN_INT (c), target, mode)
+ but that meant that we can't handle INT_MIN on 32-bit machines
+ (like NT/Alpha), because we recurse indefinitely through
+ emit_move_insn to gen_movdi. So instead, since we know exactly
+ what we want, create it explicitly. */
+
+ if (target == NULL)
+ target = gen_reg_rtx (mode);
+ emit_insn (gen_rtx (SET, VOIDmode, target, GEN_INT (c)));
+ return target;
+ }
else if (n >= 2 + (extra != 0))
{
temp = copy_to_suggested_reg (GEN_INT (low), subtarget, mode);
/* Now try high-order zero bits. Here we try the shifted-in bits as
all zero and all ones. Be careful to avoid shifting outside the
mode and to avoid shifting outside the host wide int size. */
+ /* On narrow hosts, don't shift a 1 into the high bit, since we'll
+ confuse the recursive call and set all of the high 32 bits. */
if ((bits = (MIN (HOST_BITS_PER_WIDE_INT, GET_MODE_SIZE (mode) * 8)
- - floor_log2 (c) - 1)) > 0)
+ - floor_log2 (c) - 1 - (HOST_BITS_PER_WIDE_INT < 64))) > 0)
for (; bits > 0; bits--)
if ((temp = alpha_emit_set_const (subtarget, mode,
c << bits, i)) != 0