-#ifdef NEG_TWOC
-
- /* If we have two's complement arithmetic then masks are signed; this
- * avoids a switch to unsigned representation, with the consequent problem
- * of overflow when we convert back.
- */
- typedef int32 mask32;
-
- /* Convert an unsigned mask M into a `mask32'. This is a hairy-looking
- * no-op on many targets, but, given that we have two's complement
- * integers, it is free of arithmetic overflow.
- */
-# define FIX_MASK32(m) \
- ((mask32)((m)&0x7fffffffu) + (-(mask32)0x7fffffff - 1)*(((m) >> 31)&1u))
-
- /* If Z is zero and M has its low 32 bits set, then copy (at least) the low
- * 32 bits of X to Z; if M is zero, do nothing. Otherwise, scramble Z
- * unhelpfully.
- */
-# define CONDPICK(z, x, m) do { (z) |= (x)&(m); } while (0)
-
- /* If M has its low 32 bits set, then return (at least) the low 32 bits of
- * X in Z; if M is zero, then return (at least) the low 32 bits of Y in Z.
- * Otherwise, return an unhelful result.
- */
-# define PICK2(x, y, m) (((x)&(m)) | ((y)&~(m)))
-
- /* If M has its low 32 bits set then swap (at least) the low 32 bits of X
- * and Y; if M is zero, then do nothing. Otherwise, scramble X and Y
- * unhelpfully.
- */
-# define CONDSWAP(x, y, m) \
- do { mask32 t_ = ((x) ^ (y))&(m); (x) ^= t_; (y) ^= t_; } while (0)
-#else
-# error "Targets without two's complement arithmetic aren't supported"
-#endif
+
+/* If we have two's complement arithmetic then masks are signed; this
+ * avoids a switch to unsigned representation, with the consequent problem
+ * of overflow when we convert back.
+ */
+typedef int32 mask32;
+
+/* Convert an unsigned mask M into a `mask32'. This is a hairy-looking
+ * no-op on many targets, but, given that we have two's complement
+ * integers, it is free of arithmetic overflow.
+ */
+#define FIX_MASK32(m) \
+ ((mask32)((m)&0x7fffffffu) + (-(mask32)0x7fffffff - 1)*(((m) >> 31)&1u))
+
+/* If Z is zero and M has its low 32 bits set, then copy (at least) the low
+ * 32 bits of X to Z; if M is zero, do nothing. Otherwise, scramble Z
+ * unhelpfully.
+ */
+#define CONDPICK(z, x, m) do { (z) |= (x)&(m); } while (0)
+
+/* If M has its low 32 bits set, then return (at least) the low 32 bits of
+ * X in Z; if M is zero, then return (at least) the low 32 bits of Y in Z.
+ * Otherwise, return an unhelful result.
+ */
+#define PICK2(x, y, m) (((x)&(m)) | ((y)&~(m)))
+
+/* If M has its low 32 bits set then swap (at least) the low 32 bits of X
+ * and Y; if M is zero, then do nothing. Otherwise, scramble X and Y
+ * unhelpfully.
+ */
+#define CONDSWAP(x, y, m) \
+ do { mask32 t_ = ((x) ^ (y))&(m); (x) ^= t_; (y) ^= t_; } while (0)