#endif
/* -----------------------------------------------------------------------------
+ Write-combining store
+ -------------------------------------------------------------------------- */
+
+INLINE_HEADER void
+wcStore (StgPtr p, StgWord w)
+{
+#ifdef x86_64_HOST_ARCH
+ __asm__(
+ "movnti\t%1, %0"
+ : "=m" (*p)
+ : "r" (w)
+ );
+#else
+ *p = w;
+#endif
+}
+
+/* -----------------------------------------------------------------------------
Integer multiply with overflow
-------------------------------------------------------------------------- */
#else
-#define HALF_INT (((I_)1) << (BITS_IN (I_) / 2))
+/* Approximate version when we don't have long arithmetic (on 64-bit archs) */
-#define stg_abs(a) (((I_)(a)) < 0 ? -((I_)(a)) : ((I_)(a)))
+#define HALF_POS_INT (((I_)1) << (BITS_IN (I_) / 2))
+#define HALF_NEG_INT (-HALF_POS_INT)
#define mulIntMayOflo(a,b) \
({ \
I_ c; \
- if (stg_abs(a) >= HALF_INT || \
- stg_abs(b) >= HALF_INT) { \
+ if ((I_)a <= HALF_NEG_INT || a >= HALF_POS_INT \
+ || (I_)b <= HALF_NEG_INT || b >= HALF_POS_INT) {\
c = 1; \
} else { \
c = 0; \